JP6406700B2 - Wireless communication system, wireless terminal, and wireless communication method - Google Patents

Description

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

  In recent years, with the development of wireless and wired communication technologies, the amount of traffic flowing through a network has increased rapidly. According to various statistics, the increase amount is about 1.5 to 2 times every year, and it is expected that about 10 to 15 years later, the communication capacity will be about 1000 times that of 2010.

  On the other hand, next-generation communication networks are required to have extremely high reliability as infrastructure infrastructure indispensable to society. In societies that assume that everything is connected to the network, disruption of network access can cause significant social disruption. In addition, in order to ensure emergency communication means to accurately communicate your location and situation in the event of a major natural disaster, etc., a high-availability network that guarantees minimum network access in any situation Realization is essential.

  Heterogeneous wireless integrated network (heterogeneous network) combining multiple communication systems with different properties is an effective means to realize the above two requirements, large capacity (= high efficiency) and high reliability. It is done. This is a network designed to overlap transmission / reception ranges of a plurality of radio base stations so that a single mobile station (terminal) can be covered by a plurality of radio systems. According to this concept, even if a single system is stopped due to some cause, the terminal can continue communication with another system.

  In a heterogeneous wireless integrated network, a method of combining base stations with different cell radii is effective. That is, a macro base station that can cover a large range with a single base station overlaps a small base station that covers only a short distance. A small base station can reuse the same frequency resource in a short cycle, and since the communication distance is short, the transmission power can be reduced, and by suppressing interference power, the frequency utilization efficiency can be kept high. Is possible. On the other hand, since the macro base station covers a large area with high power, it exerts its strength in securing a transmission / reception range including indoor terminals and high-speed mobile terminals. In this way, by combining radio stations with different properties, it is possible to increase the capacity = frequency use efficiency.

  Thus, by utilizing a small base station with high frequency utilization efficiency, it is possible to expand the communication capacity of the entire wireless system. In other words, it is desirable to process as much traffic as possible via a small base station. This is called data offload or traffic offload, and various schemes have been proposed for accurately connecting a terminal to a small base station with low transmission power.

  For a macro base station having a cell radius of about 100 m to 2 km, various candidates are considered as small base stations. Possible candidates include, for example, a wireless LAN represented by the IEEE802.11 series having a cell radius of 10 m, a wireless PAN utilizing millimeter waves, and the like. The wireless LAN has a processing capacity of about 1 Gbps per base station (access point), and the wireless PAN has a processing capacity of about 10 Gbps per base station (access point). Along with the reduction of the cell radius, the transmission performance per unit area is remarkably improved.

  In other words, a small base station cannot be effective unless there is high-density traffic per area. Wireless LAN addresses this problem by locating base stations at places where people (or terminals) are crowded, such as in stations, intersections, and airports. That is, the design is such that traffic is efficiently guided to the wireless LAN base station by selectively making a small base station a service area where a large amount of traffic occurs in a limited area. Considering the human behavior, there is a considerable number of people in the radius range of 10m, that is, a large amount of traffic is expected, and efficient data offloading is possible. In other words, it seems that geographical data compression is performed.

  However, in order to further increase the network efficiency, it is indispensable to use a micro base station (pico base station) such as a wireless PAN having a smaller cell radius. For example, in wireless PAN, since the cell radius is several meters, even if the walking speed is considered, it passes through the cell in a few seconds. In addition, the number of users residing in the cell is considered to be extremely small. Since wireless PAN base stations are only arranged discretely (spot-like), even if the base stations are placed in a crowded area, the wireless PAN's The possibility of being in a cell is very low. In such a situation, traffic is processed at the wireless LAN base station or macro base station that overlays the wireless PAN, so that the efficiency of the entire network cannot be improved.

  Thus, since the transmission / reception range of a pico base station such as a wireless PAN is a range that passes within a few seconds even at a walking speed, it cannot be expected that a large amount of traffic will be generated for the user during this period. Moreover, even if the user is in a quasi-stationary state, the number of persons that can be accommodated is only a few, and the averaging effect between users is not so great. On the other hand, when considering individual users, some kind of traffic such as downloading of moving images, collection of news information, and purchase of electronic books is generated at any time throughout the day. Therefore, it is important to match the generation of this large volume traffic with the transit time of the pico base station, and for this purpose, it is considered that scheduling for adjusting traffic in the time direction is effective.

  In general, with the exception of viewing news in real time, video downloads and uploads, book purchases (downloads), etc. are often allowed to be delayed by several hours. As an example, it is assumed that there are many cases where there is no problem if a movie or book to be purchased at home is specified and the download is completed during the daytime movement. It can be used to save and back up a library of photos you have created on your server. Delay management scheduling is effective for such traffic. That is, in the example shown in FIG. 5, when a small cell such as a wireless LAN base station and a pico cell of a pico base station overlap in a wide area cell of a macro base station, communication is not performed at the time of traffic occurrence. By managing the allowable delay time, a pico base station capable of performing communication as fast and highly efficient as possible within the allowable delay time is selected, and the traffic accumulated in the time direction is collectively transmitted and received.

  Conventionally, as a data transmission / reception method based on such a concept of delay management scheduling, a gate-type pico base station has been installed in front of the building entrance and elevator, and when a large amount of traffic occurs in each user, an allowable delay is simultaneously provided. Set the time, the scheduler of the terminal waits for communication, and if the terminal passes through the cell of the pico base station installed at the entrance etc. within the allowable delay time, it performs transmission / reception there, and within the allowable delay time If a terminal does not enter the pico base station cell, a method has been proposed in which transmission / reception is performed via the macro base station immediately before the allowable delay time limit (see, for example, Non-Patent Document 1).

Ehab Mahmoud Mohamed, Kei Sakaguchi, Seiichi Sampei, “Delayed Offloading using Cloud Cooperated Millimeter Wave Gates”, Proc. Of 25th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Sep. 2014, p.1852-1856

  In the method described in Non-Patent Document 1, since only the allowable delay time is managed, whether to enter the cell of the pico base station is left to chance. For this reason, even if there is only a macro base station in the surroundings and no pico base station exists, traffic is kept waiting, and transmission / reception is finally performed using the macro base station. In addition, transmission / reception is not performed even when passing through the wireless LAN base station while waiting for traffic, and if there is only a macro base station immediately before the time limit, transmission / reception is performed using the macro base station. Thus, the method described in Non-Patent Document 1 has a problem in that communication efficiency often decreases.

  The present invention has been made paying attention to such a problem, and an object thereof is to provide a wireless communication system, a wireless terminal, and a wireless communication method that can further improve communication efficiency.

In order to achieve the above object, a wireless communication system according to the present invention includes:
A wireless communication system having a plurality of base stations having different transmission speeds and a terminal provided so as to be able to perform wireless communication with each base station, wherein the current position, moving speed, moving direction, moving path of the terminal, and Based on terminal information including at least one of the destinations, a route prediction means for predicting the route of the terminal, and a minimum for transmitting the transmission data when transmission data is generated at the terminal Threshold setting means for setting a transmission speed threshold based on base station information arranged around the route predicted by the route prediction means as the required transmission speed , and the terminal is equal to or higher than the transmission speed threshold And a data transmission means for transmitting the transmission data via the base station when connection with a base station having a transmission rate becomes possible.

The wireless communication method according to the present invention is such that when transmission data is generated in a terminal capable of wireless communication with a plurality of base stations having different transmission speeds, the current position, movement speed, movement direction, movement of the terminal based on the terminal information including at least any one of route and the destination, to predict the path of the terminal, as the transmission rate to the minimum required to transmit the transmission data, which is the predicted path A transmission rate threshold is set based on base station information arranged around the base station, and when the terminal can connect to a base station having a transmission rate equal to or higher than the transmission rate threshold, the base station The transmission data is transmitted via the network.

  In the wireless communication system and the wireless communication method according to the present invention, transmission is not performed immediately when transmission data is generated in the terminal, but a transmission speed threshold value that is required to transmit the transmission data is set and the transmission is performed. Since transmission data is transmitted when transmission is possible at a transmission speed equal to or higher than the speed threshold, transmission data can be transmitted at high speed. For this reason, for example, by setting a transmission speed threshold smaller than the transmission speed of the wireless LAN base station, communication of the wireless LAN base station can be performed without passing through the communication area of the pico base station such as a wireless PAN during transmission standby. If it passes through the area, transmission data can be transmitted at that time.

  As described above, the wireless communication system and the wireless communication method according to the present invention improve the communication efficiency by managing transmission using the transmission rate threshold, compared to the conventional one that manages only the allowable delay time. Can be made. The wireless communication system and the wireless communication method according to the present invention can be suitably used for transmitting transmission data that is not required to be transmitted in real time. In the wireless communication system and the wireless communication method according to the present invention, the transmission rate threshold is preferably set for each transmission data based on an attribute such as a data amount of each transmission data.

The wireless communication system and the wireless communication method according to the present invention can easily set a transmission rate threshold with good communication efficiency by using base station information arranged around a predicted route when setting the transmission rate threshold. Can be set to For example, when there is no pico base station such as a wireless PAN around the route, it can be transmitted immediately via the macro base station by setting a transmission rate threshold smaller than the transmission rate of the macro base station or the wireless LAN base station. When it passes through the communication area of the wireless LAN base station, it can be transmitted via the wireless LAN base station. As a result, it is possible to avoid a state in which transmission data is kept waiting indefinitely, and it is possible to improve communication efficiency.

  The base station information used when setting the transmission rate threshold is, for example, a neighboring base station linked to location information described in the wireless communication system and wireless communication method of Japanese Patent Application No. 2013-250343 by the present inventors. Map information including station signal quality and throughput (expected information transmission rate) can be used. This map information is preferably distributed in advance or periodically from the base station to the terminal when the terminal sets the transmission rate threshold. By using such map information, base station information around the predicted route of the terminal can be grasped in advance, so that an optimum transmission rate threshold can be set.

  In the wireless communication system according to the present invention, the terminal may include the threshold setting unit, or the threshold setting unit and the route prediction unit. In the wireless communication method according to the present invention, the terminal may perform setting of the transmission rate threshold value, or setting of the transmission rate threshold value and prediction of the route of the terminal. In this case, delay management scheduling of transmission data can be performed on the terminal side. Moreover, the radio | wireless terminal which concerns on this invention can be comprised.

  In addition, the wireless communication system according to the present invention includes a network control unit provided to be able to communicate with each base station, and when the transmission data is generated, the terminal passes through a connectable base station. Terminal information transmitting means for transmitting the terminal information to the network control section, the network control section having the threshold setting means and the route prediction means, and the transmission set by the threshold setting means You may have a threshold transmission means to transmit a speed threshold value to the said terminal via the base station which can be connected. In the wireless communication method according to the present invention, when the transmission data is generated, the terminal is configured to be able to communicate the terminal information via a connectable base station with each base station. The network control unit may predict the route of the terminal and set the transmission rate threshold, and may transmit the transmission rate threshold to the terminal via a connectable base station. In this case, the network controller can predict the route of the terminal using a complicated algorithm and set the transmission rate threshold value, thereby further improving the communication efficiency.

  In the case of having this network control unit, the network control unit has route information recording means for recording movement route information of all terminals in a database, and the route prediction means is further recorded by the route information recording means. The route of the terminal may be predicted using the travel route information. In this case, the route prediction based on the experience so far can be performed, the prediction accuracy can be improved, and as a result, the communication efficiency can also be improved.

  In the wireless communication system according to the present invention, when the transmission data is generated, the terminal sets a delay time setting means for setting an allowable delay time as a time allowed until the transmission data is transmitted, and the data transmission means It is preferable to have forcible transmission means for transmitting the transmission data via a connectable base station when the transmission data becomes less than a predetermined time until the allowable delay time without transmitting the transmission data. In this case, transmission data can be reliably transmitted before the allowable delay time. The allowable delay time is preferably set for each transmission data based on attributes such as the urgency of each transmission data.

  When setting the allowable delay time, the threshold setting means further uses at least one of the signal quality distribution and data processing capability of base stations arranged around the terminal, and the allowable delay time. The transmission rate threshold is preferably set. In this case, an optimum transmission rate threshold value can be set according to the location of the terminal and the actual situation of transmission data.

  Further, when setting the allowable delay time, the threshold value setting means corrects the transmission rate threshold value once or a plurality of times according to the remaining time of the allowable delay time until transmission data is transmitted, and creates a new one. A transmission rate threshold is set, and when the terminal becomes connectable with a base station having a transmission rate equal to or higher than the latest transmission rate threshold, the data transmission means transmits the transmission data via the base station. May be sent. In this case, the transmission rate threshold value can always be set to an optimum value. For example, the terminal route may be regularly predicted, and the transmission rate threshold value may be corrected each time.

  Further, when setting the allowable delay time, the threshold setting means may set the transmission rate threshold so that the value becomes smaller as the allowable delay time is shorter. In this case, before the transmission data is forcibly transmitted, the transmission data can be transmitted with the highest possible communication efficiency.

The wireless communication system according to the present invention, when the data amount of the transmission data is equal to or greater than a predetermined amount , from among the base stations arranged around the terminal or around the route predicted by the route prediction means, It is preferable to include a route instruction unit that selects a base station having a transmission rate equal to or higher than the transmission rate threshold for transmitting transmission data and indicates the route to the communication area of the base station to the terminal. In this case, a terminal in which transmission data having a large amount of data is generated can be guided to a communication area of a base station capable of high-speed communication. For this reason, efficient communication is possible, and the communication efficiency of the entire system can be increased. Routing means, even if the terminal has, but it may also have a network control unit has.

  According to the present invention, it is possible to provide a wireless communication system, a wireless terminal, and a wireless communication method that can further improve communication efficiency.

1 is an overall configuration diagram illustrating a wireless communication system, a wireless terminal, and a wireless communication method according to a first embodiment of the present invention. It is a block block diagram which shows the radio | wireless terminal of the radio | wireless communications system of the 1st Embodiment of this invention. It is a block block diagram which shows the network control part of the radio | wireless communications system of the 2nd Embodiment of this invention. It is a block block diagram which shows the radio | wireless terminal of the radio | wireless communications system of the 3rd Embodiment of this invention. It is explanatory drawing which shows the principle of the delay management scheduling in the conventional different radio | wireless integrated network.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a wireless communication system, a wireless terminal, and a wireless communication method according to a first embodiment of the present invention. The wireless communication method according to the first embodiment of the present invention is a method performed by the wireless communication system and the wireless terminal according to the first embodiment of the present invention.

  As illustrated in FIG. 1, the wireless communication system 10 according to the first embodiment of this invention includes a plurality of wireless communication network systems 11 and a plurality of terminals 12. Each wireless communication network system 11 has one or a plurality of base stations 11a. All the base stations 11a have their own transmission rates, and can be classified into a plurality of different transmission rates. As shown in FIG. 1, each wireless communication network system 11 has a part or all of its communication area overlapping with the communication area of one or more other wireless communication network systems 11 having different transmission rates of the base station 11a. Yes.

  In the example illustrated in FIG. 1, each wireless communication network system 11 includes a wide area cellular, a WLAN, and a WPAN, but is not limited thereto. Each base station 11a includes not only base stations such as wide area cellular and WPAN, but also WLAN access points (AP), CSMA / CA hosts, and the like.

  Each terminal 12 is provided so as to be capable of wireless communication with each base station 11a. As shown in FIG. 2, each terminal 12 includes a transmission / reception antenna 21, a wireless communication function unit 22, a map management unit 23, a route prediction unit 24, a threshold setting (transmission speed threshold determination) unit 25, a location management unit 26, and a delay. A scheduler unit 27 and a memory unit 28 are provided. The wireless communication function unit 22 is connected to the transmission / reception antenna 21 and includes a high frequency unit, a modulation / demodulation unit, an access control unit for performing retransmission and various controls. The map management unit 23 stores the map information S3 including the signal quality and throughput (expected information transmission rate) of the neighboring base station 11a associated with the location information, with the network control unit (Hetero-Network Controller; management) shown in FIG. Server) and the like via the transmission / reception antenna 21 and the wireless communication function unit 22, and is managed.

  The route predicting unit 24 is configured to predict a future moving route of the terminal 12 based on terminal information including at least one of the current position, moving speed, moving direction, and moving route of the terminal 12. Yes. When transmission data S8 is generated in an upper layer such as an application, the threshold setting unit 25 includes map information S3 of the map management unit 23, route prediction information S4 predicted by the route prediction unit 24, and allowable delay time information S5. Based on this, the transmission rate threshold is set as the minimum required transmission rate for transmitting the transmission data S8. The permissible delay time information S5 is permitted until transmission data S8 is transmitted by delay time setting means (not shown) provided in the application (upper layer) when transmission data S8 is generated. This is information on allowable delay time set as time.

  The located area management unit 26 is configured to perform handover and base station (system) selection based on the current position of the terminal 12 and the map information S3 of the map management unit 23. The delay scheduler unit 27 determines the transmission / reception timing of the transmission data S8 based on the allowable delay time information S5, the transmission rate threshold information S7, and the transmission rate information of the base station 11a selected by the location management unit 26. It is configured as follows. The memory unit 28 is configured to temporarily store transmission data S8 generated by an application (upper layer).

  When each terminal 12 becomes connectable with a base station 11a having a transmission rate equal to or higher than a transmission rate threshold, the delay scheduler unit 27 determines to transmit transmission data via the base station 11a. Transmission data stored in the memory unit 28 is transmitted via the wireless communication function unit 22 and the transmission / reception antenna 21. Further, each terminal 12 causes the delay scheduler unit 27 to immediately transmit the transmission data via the connectable base station 11a when the predetermined delay time or less is reached without transmitting the transmission data. The transmission data determined and stored in the memory unit 28 is transmitted.

  Next, the operation of the wireless communication system 10 according to the first embodiment of this invention will be described. In the wireless communication system 10 according to the first embodiment of this invention, the map information S3 is transmitted from the network control unit (management server) shown in FIG. 1 or the like via an arbitrary base station 11a in advance or periodically. The data is distributed to the terminal 12, demodulated by the wireless communication function unit 22, and managed by the map management unit 23. The map information S3 includes location information of the neighboring base station 11a, signal quality information, information on the predicted throughput, and the like. In addition, as map information, what was described in the wireless communication system and the wireless communication method of Japanese Patent Application No. 2013-250343 by this inventor etc. can be used, for example. The located area management unit 26 always refers to the neighboring base station information of the map information and performs base station selection (handover) together with the location of the terminal 12 itself.

  When transmission data S8 is generated by various applications, the transmission data S8 is framed and then temporarily stored in the memory unit 28. The transmission data S8 includes non-real-time information that does not cause any problems if it is executed within a certain period of time, such as video download, data backup, and various application downloads, as well as information such as VoIP and TV calls that require real-time performance. Is present. In accordance with the characteristics of such information, an allowable delay time is set for each transmission data S8 by the application. The set allowable delay time information S5 is sent to the threshold value setting unit 25 and the delay scheduler unit 27.

  The threshold setting unit 25 determines the minimum transmission rate (expected value) of the base station 11a used for wireless transmission of the transmission data for each transmission data as the transmission rate threshold. For example, the threshold setting unit 25 uses the allowable delay time information S5, the map information S3, and the route prediction information S4 to determine the terminal 12 within the allowable delay time. The throughput of the base station 11a through which the network passes is predicted, the type of the base station 11a that transmits and receives transmission data is selected so that the efficiency of the entire network is improved, and the transmission rate threshold value S7 is determined. Here, the route prediction information S4 is generated by the route prediction unit 24 by predicting the movement route of the terminal 12 based on the position information of the terminal 12 obtained from the quasi-zenith satellite system (QZSS) or the like. . For this prediction, the moving direction and moving speed of the terminal 12, past moving routes (patterned routes such as commuting and attending school), road information used in car navigation, and the like are used.

  The delay scheduler unit 27 determines the transmission timing of transmission data stored in the memory 8 based on the allowable delay time information S5, the transmission rate threshold value S7, and the throughput information of the base station 11a selected by the in-zone management unit 26. I manage. As a result, each terminal 12 performs transmission via the wireless communication function unit 22 when it becomes possible to connect to the base station 11a having a transmission rate equal to or higher than the transmission rate threshold. Further, when the transmission time becomes less than the predetermined time until the allowable delay time without transmitting the transmission data, the transmission is immediately executed via the connectable base station 11a.

  In order to improve the efficiency of the entire heterogeneous network, it is desirable to perform communication with the base station 11a with the highest possible throughput (concentrate transmission data on the high-throughput base station 11a). However, the path prediction is not always correct, and the throughput of each base station 11a varies with time, so that the predicted throughput may be reduced when the base station 11a arrives at the communication area. There is also. For this reason, a threshold is set with a certain margin, and transmission is executed when passing through the communication area of the base station 11a having a throughput exceeding the determined transmission rate threshold.

  According to the wireless communication system 10 of the first embodiment of the present invention, when transmission data is generated in the terminal 12, the transmission is not performed immediately, the wireless transmission is waited according to the allowable delay time, and the transmission rate threshold value is set. Is set, transmission data can be transmitted at high speed using the base station 11a with higher throughput. Thereby, in the heterogeneous network, traffic can be concentrated on the base station 11a having a generally narrow coverage and a high throughput, and the efficiency of the entire network can be improved.

  Further, in the wireless communication system 10 according to the first embodiment of this invention, for example, by setting a transmission rate threshold value that is smaller than the transmission rate of the wireless LAN base station, a pico base station such as a wireless PAN is waiting for transmission. Even if it does not pass through the communication area, if it passes through the communication area of the wireless LAN base station, transmission data can be transmitted at that time. Thus, by managing transmission using the transmission rate threshold value, it is possible to further improve the communication efficiency as compared with the conventional one that manages only the allowable delay time.

  Further, in the wireless communication system 10 according to the first embodiment of this invention, since the map information including the base station information arranged around the predicted route is used when setting the transmission rate threshold, the communication is performed. An efficient transmission rate threshold can be easily set. For example, when there is no pico base station such as a wireless PAN around the route, it can be transmitted immediately via the macro base station by setting a transmission rate threshold smaller than the transmission rate of the macro base station or the wireless LAN base station. When it passes through the communication area of the wireless LAN base station, it can be transmitted via the wireless LAN base station. As a result, it is possible to avoid a state in which transmission data is kept waiting indefinitely, and it is possible to improve communication efficiency.

  Moreover, the radio | wireless communications system 10 of the 1st Embodiment of this invention is applicable also to an indoor environment. For example, if the building where the terminal 12 is located can be identified and it is known that a pico base station is installed in the building (around the entrance gate, etc.), the terminal 12 can pass through the pico base station. Increases nature. For this reason, by considering the pico base station when setting the transmission rate threshold value, transmission at a high speed is possible, and communication efficiency can be improved.

  In the wireless communication system 10 according to the first embodiment of this invention, the transmission rate threshold value is corrected a plurality of times according to the remaining time of the allowable delay time until transmission data is transmitted, so that it is equal to or higher than the latest transmission rate threshold value. When it becomes possible to connect to a base station 11a having a transmission speed of, transmission data may be transmitted via the base station 11a. For example, the route of the terminal 12 may be periodically predicted, and the transmission rate threshold value may be corrected each time. In this case, since the accuracy of route prediction increases as the allowable delay time approaches, a more appropriate transmission rate threshold value can be selected. Further, since it is required to perform transmission more reliably as the allowable delay time gets closer, it is preferable to select a transmission rate threshold value (a smaller transmission rate threshold value) that has a margin as the remaining time becomes shorter. As a result, before the transmission data is forcibly transmitted, the transmission data can be transmitted with the highest possible communication efficiency.

  In addition, it is preferable to use destination information for route prediction. In this case, more accurate prediction is possible. It is also effective to perform route prediction based on destination information input from the user and set a transmission rate threshold value together with map information and allowable delay time information. Furthermore, the moving speed of the terminal 12 may be used for route prediction. In a high-speed moving environment, the time spent in a pico base station such as WPAN becomes very short, so high throughput cannot be expected. Therefore, under such conditions, it is necessary to remove the pico base station from the transmission / reception execution candidate base station. Thus, the moving speed of the terminal 12 is also an important parameter for route prediction and transmission speed threshold setting.

FIG. 3 shows a wireless communication system and a wireless communication method according to the second embodiment of the present invention.
The wireless communication system according to the second embodiment of the present invention includes a plurality of wireless communication network systems 11, a plurality of terminals 12, an inter-base station communication network (backbone network) 31, and a network control unit 32. In the following description, the same components as those in the wireless communication system 10 according to the first embodiment of the present invention are denoted by the same reference numerals, and redundant description is omitted.

  The wireless communication system according to the second embodiment of the present invention includes a map management unit 23, a route prediction unit 24, and a threshold setting (transmission rate threshold value) included in the terminal 12 in the wireless communication system 10 according to the first embodiment of the present invention. The function of the (determining) unit 25 is moved to the network control unit 32 (cloud side).

  Each terminal 12 does not have the map management unit 23, the route prediction unit 24, and the threshold setting unit 25. In addition, each terminal 12 can connect terminal information including at least one of the current position, moving speed, moving direction, and destination, and allowable delay time information when transmission data is generated, to a base station that can connect It is comprised so that it may transmit to the network control part 32 via 11a. Each terminal 12 is configured to manage transmission of transmission data using a transmission rate threshold value transmitted from the network control unit 32.

  The inter-base station communication network 31 is composed of a general-purpose IP network, and is connected to each base station 11 a of each radio communication network system 11. The inter-base station communication network 31 connects all base stations 11a to each other.

  The network control unit 32 is connected to the inter-base station communication network 31 in a wired manner, and is communicably connected to all the base stations 11a via the inter-base station communication network 31. As shown in FIG. 3, the network control unit 32 includes a wired communication function unit 41, a map information generation / management unit 42, a map / road information database 43, a user route database 44, a route prediction unit 45, a threshold setting (transmission speed threshold value). Determination) unit 46. The wired communication function unit 41 is configured to communicate with each base station 11a via the inter-base station communication network 31. The map information generation / management unit 42 is configured to collect information S40 related to signal quality and throughput from each terminal 12 and each base station 11a, and to perform statistical processing to generate map information. The map / road information database 43 is configured to manage map information and road information acquired in advance as a database. The user route database 44 is configured to record and manage past routes (movement route information) and behavior patterns of each user (terminal 12) and create a database.

  The route predicting unit 45 determines the travel route of each terminal 12 based on the terminal information S41 from each terminal 12, the map information and road information in the map / road information database 43, the user's past route information in the user route database 44, and the like. Is configured to predict. The threshold setting unit 46 is configured to set the transmission rate threshold S42 based on the map information from the map information generation / management unit 42, the allowable delay time information from each terminal 12, and the route prediction information S43. Yes. The network control unit 32 is configured to transmit the transmission rate threshold S42 set by the threshold setting unit 46 to the corresponding terminal 12 via the connectable base station 11a.

  Note that the network control unit 32 includes one, and one of them may cover the entire wireless communication network system 11, and includes a plurality, each of which covers the wireless communication network system 11 in a predetermined range. May be.

  Next, the operation of the wireless communication system according to the second embodiment of this invention will be described. In the radio communication system according to the second embodiment of the present invention, the network control unit 32 regularly communicates with each terminal 12 and each base station 11a and relates to throughput such as signal quality distribution and the number of active users. The information S40 is collected, and the map information generation / management unit 42 generates and manages the latest map information. The map / road information database 43 also stores map / road information used in car navigation systems. Furthermore, the past movement history of each user (terminal 12) is managed as a user route database 44.

  When transmission data is generated in the terminal 12, the terminal information S41 such as the current position, movement speed, movement direction, movement route, destination, and allowable delay time information are transmitted to the terminal 12 via the connectable base station 11a. To the network control unit 32. In the network control unit 32, the route prediction unit 45 performs route prediction of the terminal 12 using the terminal information S 41, the map / road information database 43, and the user route database 44. Further, the threshold setting unit 46 evaluates the transmission rate expected value of the route through which the terminal 12 passes using the route prediction information S43, the map information, and the allowable delay time information, and determines the transmission rate threshold S42. Further, the transmission rate threshold value S42 is transmitted to the terminal 12 via the connectable base station 11a. In the terminal 12, the transmission scheduler of the transmission data is managed by the delay scheduler unit 27 using the transmission speed threshold, and transmission of the transmission data is executed by the base station 11a that can realize a transmission speed exceeding the transmission speed threshold.

  According to the wireless communication system of the second embodiment of the present invention, the high-precision and wide-range map information stored in the network control unit 32, more detailed map information, road information, and user's past route information are utilized. In addition, it is possible to use a complicated prediction algorithm that requires powerful calculation performance. For this reason, a more appropriate transmission rate threshold value can be determined, and the efficiency of the entire network can be improved.

FIG. 4 shows a wireless communication system and a wireless communication method according to the third embodiment of the present invention.
In recent years, navigation services for “people” have been started or proposed using smartphones and dedicated interface devices. The wireless communication system according to the third embodiment of the present invention corresponds to the provision of such a service, and includes a plurality of wireless communication network systems 11 and a plurality of terminals 12. In the following description, the same components as those in the wireless communication system 10 according to the first embodiment of the present invention are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 4, each terminal 12 has a route instruction unit 51. The route instruction unit 51 is predicted using the map information S3 and the route prediction information S4 after the transmission rate threshold is determined by the threshold setting unit 25 when the amount of transmission data generated at the terminal 12 is equal to or larger than a predetermined amount. The base station 11a having a transmission rate equal to or higher than the transmission rate threshold for transmitting transmission data is selected from the base stations 11a arranged around the route. Furthermore, the route instruction unit 51 is configured to instruct the user of the terminal 12 on the screen or voice of the terminal 12 and the route to the communication area of the selected base station 11a.

  In the wireless communication system according to the third embodiment of the present invention, when a large amount of traffic is accumulated in the terminal 12, the user is requested to pass through the communication area of the base station 11a that can perform high-speed communication even if the traffic is slightly detoured. It is possible to give a route instruction to the user. For this reason, efficient communication is possible, and the communication efficiency of the entire system can be increased.

  In the wireless communication system according to the third embodiment of the present invention, the route instruction unit 51 may be provided in the network control unit 32 of the wireless communication system according to the second embodiment of the present invention. In this case, the route information to the communication area of the selected base station 11a is transmitted to the corresponding terminal 12 via the connectable base station 11a, thereby giving a route instruction to the user of the terminal 12. Can do.

DESCRIPTION OF SYMBOLS 10 Wireless communication system 11 Wireless communication network system 11a Base station 12 Terminal 21 Transmission / reception antenna 22 Wireless communication function part 23 Map management part 24 Path | route prediction part 25 Threshold setting part 26 Location management part 27 Delay scheduler part 28 Memory part

31 Communication network between base stations 32 Network control unit 41 Wired communication function unit 42 Map information generation / management unit 43 Map / road information database 44 User route database 45 Route prediction unit 46 Threshold setting unit

51 Route indicator

Claims (13)

A wireless communication system having a plurality of base stations with different transmission speeds and a terminal provided so as to be able to perform wireless communication with each base station,
Route prediction means for predicting the route of the terminal based on terminal information including at least one of the current position, movement speed, movement direction, movement route, and destination of the terminal;
When transmission data is generated in the terminal, transmission is performed based on base station information arranged around the route predicted by the route prediction means as a minimum transmission speed required for transmitting the transmission data. Threshold setting means for setting a speed threshold;
A data transmission means for transmitting the transmission data via the base station when the terminal becomes connectable with a base station having a transmission speed equal to or higher than the transmission speed threshold;
A wireless communication system comprising: The terminal, the threshold value setting means or a wireless communication system according to claim 1, wherein a said path predicting means and the threshold value setting means. It has a network controller provided so that it can communicate with each base station,
The terminal has terminal information transmitting means for transmitting the terminal information to the network control unit via a connectable base station when the transmission data is generated,
The network control unit includes the threshold setting unit and the route prediction unit, and transmits the transmission rate threshold set by the threshold setting unit to the terminal via a connectable base station. The wireless communication system according to claim 1, further comprising: The network control unit has route information recording means for recording movement route information of all terminals in a database,
The wireless communication system according to claim 3 , wherein the route predicting unit further predicts the route of the terminal using the moving route information recorded by the route information recording unit. When the transmission data is generated, the terminal sets a delay time setting unit as an allowable delay time until the transmission data is transmitted, and without transmitting the transmission data by the data transmission unit. when it becomes less than a predetermined time to the allowable delay time, any one of claims 1 to 4 and forced transmission means for transmitting the transmission data via the connectable base stations, characterized in that it has The wireless communication system according to 1. The threshold value setting means further sets the transmission rate threshold value using at least one of a signal quality distribution and data processing capability of base stations arranged around the terminal and the allowable delay time. The wireless communication system according to claim 5 . The threshold setting means corrects the transmission rate threshold one or more times according to the remaining time of the allowable delay time until transmission data is transmitted, and sets a new transmission rate threshold,
The data transmission means transmits the transmission data via the base station when the terminal becomes connectable with a base station having a transmission rate equal to or higher than a latest transmission rate threshold. The wireless communication system according to claim 5 or 6 . The wireless communication system according to claim 5 or 6 , wherein the threshold value setting means sets the transmission rate threshold value so that the threshold value becomes smaller as the allowable delay time is shorter. When the data amount of the transmission data is a predetermined amount or more, for transmitting the transmission data from among the base stations arranged around the terminal or around the route predicted by the route prediction means , select the base station having a transmission rate equal to or greater than the transmission speed threshold value, any one of claims 1 to 8, characterized in that it has a routing means for indicating a route to the communication area of the base station to the terminal The wireless communication system according to 1. A wireless terminal provided to be capable of wireless communication with a plurality of base stations having different transmission speeds,
Route prediction means for predicting a route based on terminal information including at least one of a current position, a moving speed, a moving direction, a moving route, and a destination;
When transmission data is generated, a transmission speed threshold is set based on base station information arranged around the route predicted by the route prediction means as a minimum transmission rate required for transmitting the transmission data. Threshold setting means for setting;
A data transmission means for transmitting the transmission data via the base station when connection with a base station having a transmission speed equal to or higher than the transmission speed threshold is enabled;
A wireless terminal comprising: When transmission data is generated in a terminal capable of wireless communication with a plurality of base stations having different transmission speeds , at least one of the current position, moving speed, moving direction, moving route, and destination of the terminal Base stations arranged around the predicted path as a minimum transmission rate required to predict the path of the terminal based on terminal information including one of them and transmit the transmission data Set the transmission rate threshold based on the information ,
When the terminal becomes connectable with a base station having a transmission rate equal to or higher than the transmission rate threshold, the transmission data is transmitted via the base station. 12. The wireless communication method according to claim 11 , wherein the terminal sets the transmission rate threshold value, or sets the transmission rate threshold value and predicts the route of the terminal. When the transmission data is generated, the terminal transmits the terminal information via a connectable base station to a network control unit provided to be able to communicate with each base station,
The network controller, said a predicted path of the terminal to set and the transmission speed threshold value, according to claim 11, wherein the transmission speed threshold value, via a connectable base station and transmits to the terminal The wireless communication method described.