JP2018098685A - Base station device, terminal equipment, communication system, and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten time when terminal equipment is connected to a base station device to which a communication bandwidth to be used for communication can be allocated.SOLUTION: A base station device of a communication system having a plurality of base station devices which relay communication by wirelessly connecting to a plurality of terminal equipment comprises: a notification part for notifying a signal for detection including a plurality of pieces of candidate communication bandwidth information corresponding to a plurality of communication bandwidths to be provided to the terminal equipment for detecting the base station device to which the terminal equipment can be wirelessly connected; a reception part for receiving a connection request including the candidate communication bandwidth information from the terminal equipment; and a connection control part for, when the communication bandwidth corresponding to the candidate communication bandwidth information included in the connection request can be provided to the terminal equipment as a connection request transmission source, performing wireless connection to the terminal equipment. The candidate communication bandwidth information included in the connection request is the candidate communication bandwidth information selected by the terminal equipment in accordance with the communication bandwidth to be used for communication performed by the terminal equipment among the plurality of pieces of candidate communication bandwidth information included in the signal for detection received by the terminal equipment.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a base station device, a terminal device, a communication system, and a communication method.

  In recent years, in a communication system using a wireless LAN, as the number of users of the wireless LAN increases, many base station apparatuses are installed. When many base station devices are installed, communication areas of a plurality of base station devices overlap. Terminal devices located in overlapping communication areas wirelessly connect to any one of a plurality of base station devices with overlapping communication areas, and communicate with other communication devices.

  The base station device to which the terminal device located in the overlapping communication area is wirelessly connected is, for example, a base station device with a good radio wave state received by the terminal device, or a wireless connection request message transmitted by the terminal device by broadcast. Is a base station apparatus that has received the response message to the terminal device first.

  Techniques related to the base station apparatus are described in Patent Documents 1 and 2 below.

Special table 2013-502826 gazette Japanese Patent Laying-Open No. 2015-012549

  However, when a terminal device determines a base station device to be connected according to a radio wave condition or a response message reception order, many terminal devices are concentrated on one base station device, and the terminal device allocates a communication bandwidth based on communication. May not be possible.

  In this case, for example, the terminal device performs a process of changing the base station device to be connected until a communication bandwidth used for communication is allocated. However, in this process, it takes time until the communication bandwidth used for communication is allocated, and the terminal device cannot perform quick communication.

  Therefore, one disclosure provides a base station device, a terminal device, a communication system, and a communication method that reduce a time for a terminal device to connect to a base station device that can allocate a communication bandwidth used for communication.

  In one aspect, a base station apparatus included in a communication system having a plurality of base station apparatuses that are wirelessly connected to a plurality of terminal apparatuses and each of the plurality of terminal apparatuses and relays communication performed by the terminal apparatuses, A notifying unit that includes a plurality of candidate communication bandwidth information corresponding to a plurality of communication bandwidths provided to the terminal device, and that reports a detection signal for detecting a base station device to which the terminal device is wirelessly connectable; , A receiving unit that receives a connection request including any one of the plurality of candidate communication bandwidth information from the terminal device, and a candidate communication included in the connection request in response to the connection request When the communication bandwidth corresponding to the bandwidth information can be provided to the terminal device that is the transmission source of the connection request, the terminal device and the connection control unit that performs the wireless connection, Candidate communication bandwidth information that corresponds to a communication bandwidth used for communication performed by the terminal device among the plurality of candidate communication bandwidth information included in the detection signal received by the terminal device, and the terminal device The candidate communication bandwidth information selected by.

  According to one disclosure, it is possible to reduce a time required for a terminal apparatus to connect to a base station apparatus that can allocate a communication bandwidth used for communication.

FIG. 1 is a diagram illustrating a configuration example of the communication system 10. FIG. 2 is a diagram illustrating an example of the remaining allocatable communication bandwidth of the base station device 200 and the requested communication bandwidth of the terminal device 100-1. FIG. 3 is a diagram illustrating a configuration example of the base station apparatus 200. FIG. 4 is a diagram illustrating an example of the identifier-communication bandwidth correspondence table 224. FIG. 5 is a diagram illustrating a configuration example of the terminal device 100. FIG. 6 is a diagram illustrating an example of a sequence of base station connection processing in which the terminal device 100 that starts communication is wirelessly connected to the base station device 200. FIG. 7 is a diagram illustrating an example of a process flowchart of the base station selection process S109. FIG. 8 is a diagram illustrating an example of a process flowchart of the connection determination process S111. FIG. 9 is a diagram illustrating an example of the provided communication bandwidth and the remaining allocatable communication bandwidth of the base station devices 200-1 and 200-2 when receiving a connection request from the terminal device 100-1. FIG. 10 is a diagram illustrating an example of the identifier-communication bandwidth correspondence table 224 according to the second embodiment.

[First embodiment]
A first embodiment will be described. The communication system according to the first embodiment includes a plurality of terminal devices and a plurality of base station devices that are wirelessly connected to the plurality of terminal devices and relay communication performed by the terminal devices. The base station apparatus broadcasts a detection signal for detecting a base station apparatus to which the terminal apparatus can be wirelessly connected, including a plurality of candidate communication bandwidth information corresponding to the plurality of communication bandwidths provided to the terminal apparatus. . Further, the base station apparatus receives a connection request including any one of the plurality of candidate communication bandwidth information from the terminal apparatus. Further, in response to the connection request, the base station device can provide the communication bandwidth corresponding to the candidate communication bandwidth information included in the connection request to the terminal device that is the source of the connection request. Make a wireless connection. The candidate communication bandwidth information included in the connection request corresponds to a communication bandwidth used for communication performed by the terminal device among a plurality of candidate communication bandwidth information included in the detection signal received by the terminal device. It is the selected candidate communication bandwidth information.

<Configuration example of communication system>
FIG. 1 is a diagram illustrating a configuration example of the communication system 10. The communication system 10 includes terminal devices 100-1 to 4 (hereinafter may be referred to as the terminal device 100) and base station devices 200-1 and 200-2 (hereinafter may be referred to as the base station device 200). The communication system 10 is a wireless communication system compliant with a communication standard for short-range wireless communication such as Wi-Fi (Wireless Fidelity), for example.

  The terminal apparatus 100 is wirelessly connected to the base station apparatus 200 and communicates with other communication apparatuses by transmitting and receiving packets including data to and from other communication apparatuses via the base station apparatus 200. The terminal device 100 is a mobile communication device such as a smartphone or a tablet terminal.

  The base station apparatus 200 is wirelessly connected to the terminal apparatus 100 and relays communication performed by the terminal apparatus 100. Base station apparatuses 200-1 and 200-2 have communication areas A1 and A2, respectively. The communication area is a range in which the base station devices 200-1 and 200-2 can be wirelessly connected to the terminal device 100. For example, the terminal device 100-1 located within the communication area A1 can be wirelessly connected to the base station device 200-1. The base station apparatus 200 is an access point in a communication system compliant with WiFi, for example.

  In FIG. 1, the terminal device 100-2 is located in the communication area A1, and the terminal devices 100-3 and 4 are located in the communication area A2. The terminal device 100-2 is wirelessly connected to the base station device 200-1, and the terminal devices 100-3 and 4 are wirelessly connected to the base station device 200-2.

  On the other hand, the terminal device 100-1 is located in a range where the communication area A1 and the communication area A2 overlap. That is, the terminal device 100-1 can wirelessly connect and communicate with both the base station device 200-1 and the base station device 200-2.

  Hereinafter, a process for requesting a wireless connection with the base station apparatus 200-1 or the base station apparatus 200-2 for the terminal apparatus 100-1 to perform communication in the communication system 10 will be described.

  When starting communication, the terminal device 100-1 searches for a base station device 200-2 capable of wireless connection. For example, the terminal device 100-1 receives the detection signal transmitted from the base station device 200, which indicates that wireless connection is possible, so that the terminal device 100-1 wirelessly communicates with the base station device 200-1 or the base station device 200-2. Detect that a connection is possible.

  FIG. 2 is a diagram illustrating an example of the remaining allocatable communication bandwidth with respect to the assignable communication bandwidth of the base station device 200 and the requested communication bandwidth of the terminal device 100-1. The communication bandwidth that can be allocated is a communication bandwidth that can be allocated to a newly connected terminal device 100 in a state where no base station device 200 is connected to the terminal device 100. The remaining allocatable communication bandwidth is a communication bandwidth (provided communication bandwidth) allocated to another terminal device 100 or being used for communication from the allocatable communication bandwidth. Reduced communication bandwidth. The requested communication bandwidth is the communication bandwidth used by the terminal device 100 for communication.

  According to FIG. 2, the communication bandwidth that can be allocated to the base station apparatuses 200-1 and 200-2 is RAM bps (Mega bit per second). The communication bandwidths used by the terminal devices 100-2, 3 and 4 for communication are R2, R3 and R4 Mbps, respectively. The requested communication bandwidth of the terminal device 100-1 is R1 Mbps.

  The base station device 200-1 has already assigned the communication bandwidth of R2 to the terminal device 100-2 with respect to the assignable communication bandwidth RA. Therefore, the remaining allocatable communication bandwidth of terminal apparatus 100-1 of base station apparatus 200-1 is a numerical value (RA-R2) obtained by subtracting R2 from RA. Similarly, the remaining allocatable communication bandwidth of base station apparatus 200-2 is a value (RA− (R3 + R4)) obtained by subtracting the sum of R3 and R4 from RA.

  When the remaining allocatable communication bandwidth (RA-R2) of the base station device 200-1 is smaller than the required communication bandwidth (R1) of the terminal device 100-1, the terminal device 100-1 is connected to the base station device 200-1. Even with a wireless connection, communication using a sufficient communication bandwidth cannot be performed. If the communication bandwidth used for communication is insufficient, for example, the terminal device 100-1 may experience a waiting time for data transmission and reception, and the service to be enjoyed may be interrupted.

  When the terminal device 100-1 is connected to the base station device 200-1 that cannot use a sufficient communication bandwidth, the terminal device 100-1 disconnects the connection with the base station device 200-1, and the base station device You may reconnect to 200-2. However, in this case, even if the base station apparatus 200-2 can allocate a sufficient communication bandwidth to the terminal apparatus 100-1, the terminal apparatus 100-1 is connected to the base station apparatus 200-1 and then Processing to switch to the station device 200-2 is performed, and processing takes time.

  Therefore, in the first embodiment, the base station device 200 uses the communication bandwidth used by the terminal device 100 for communication when the terminal device 100 is connected to the base station device 200 (hereinafter referred to as a requested communication bandwidth). When the information about the device is acquired and the own device can allocate the requested communication bandwidth to the terminal device 100, the terminal device 100 is wirelessly connected. Thereby, the terminal device 100 can wirelessly connect to the base station device 200 to which the requested communication bandwidth can be allocated in a short time without performing processing such as reconnection.

<Configuration example of base station device>
FIG. 3 is a diagram illustrating a configuration example of the base station apparatus 200. The base station apparatus 200 includes a CPU (Central Processing Unit) 210, a storage 220, a memory 230 such as a DRAM (Dynamic Random Access Memory), a NIC (Network Interface Card) 240, and an RF (Radio Frequency) circuit 250.

  The storage 220 is an auxiliary storage device such as a flash memory, an HDD (Hard Disk Drive), or an SSD (Solid State Drive) that stores programs and data. The storage 220 stores a communication control program 221, a connection control program 222, a detection signal notification program 223, and an identifier-communication bandwidth correspondence table 224.

  The identifier-communication bandwidth correspondence table 224 is a table that stores identifiers and communication bandwidths corresponding to the identifiers. FIG. 4 is a diagram illustrating an example of the identifier-communication bandwidth correspondence table 224. The information elements stored in the identifier-communication bandwidth correspondence table 224 are, for example, “network identifier” and “communication bandwidth”.

  The “network identifier” is, for example, an identifier that is included in the detection signal and broadcasted by the base station apparatus 200, and is an ESSID (Extended Service Set Identifier) in a communication system compliant with WiFi. The ESSID is a network identifier that identifies a network that the base station apparatus 200 includes in the broadcast information and broadcasts, and is an identifier that is an extension of an SSID (Service Set Identifier) that identifies the base station apparatus. The network is, for example, a network that connects between the base station device 200 and the terminal device 100. Base station apparatus 200 broadcasts broadcast information including a plurality of ESSIDs. A plurality of base station apparatuses 200 in the communication system 10 may broadcast notification information including the same ESSID.

  The “communication bandwidth” is a throughput allocated (provided) to the terminal apparatus 100, and its unit is Mbps. The communication bandwidth indicates a communication bandwidth range such as less than 20 Mbps, 20 Mbps or more and less than 50 Mbps, or 50 Mbps or more.

  In FIG. 4, for example, the network identifier ID1 corresponds to a communication bandwidth of less than 20 Mbps. When the communication bandwidth (requested communication bandwidth) used for communication is less than 20 Mbps, the terminal device 100 sends a connection request including a network identifier ID1 and a message requesting a wireless connection to the base station device 200. To device 200. The base station device 200 recognizes the requested communication bandwidth of the terminal device 100 based on the network identifier included in the connection request, and determines whether the requested communication bandwidth can be allocated.

  In the first embodiment, each of the plurality of network identifiers corresponds to a communication bandwidth. The network identifier indicates a communication bandwidth that is a candidate to be allocated (or provided) to the terminal device 100 by the base station device 200 (hereinafter may be referred to as a candidate communication bandwidth). That is, the network identifier is candidate communication bandwidth information indicating the candidate communication bandwidth of the base station apparatus 200.

  In the first embodiment, a network identifier is used as candidate communication bandwidth information, but an information element other than the network identifier included in information broadcast by base station apparatus 200 is used as a candidate communication bandwidth. Also good. The base station device 200 only needs to be able to broadcast information including candidate communication bandwidth information before connecting to the terminal device 100.

  The memory 230 is an area for loading a program stored in the storage 220. The memory 230 is also used as an area where the program stores data.

  The NIC 240 is a network interface that connects to another base station device 200 or an external network. The base station apparatus 200 relays communication of the terminal apparatus 100 by transmitting and receiving packets to and from other communication apparatuses and external networks via the NIC 240.

  The RF circuit 250 is a device that is wirelessly connected to the terminal device 100. For example, the RF circuit 250 includes an antenna and transmits and receives radio waves to and from the terminal device 100 that is wirelessly connected to the terminal device 100 to transmit and receive packets including data.

  The CPU 210 performs a communication control process by executing the communication control program 221. The communication control process is a process for relaying communication performed by the terminal device 100. In the communication control process, the base station apparatus 200 transmits, for example, a packet received from the terminal apparatus 100 to the packet transmission destination. In the communication control process, for example, when receiving a packet addressed to the terminal device 100, the base station device 200 transmits the received packet to the terminal device 100.

  Further, the CPU 210 executes the connection control program 222 to construct a receiving unit and a connection control unit, and performs a connection control process. The connection control process is a process for controlling wireless connection with the terminal device 100. The connection control process includes a connection request reception process and a connection determination process which will be described later.

  The CPU 210 executes the connection request reception module 2221 to construct a reception unit and perform connection request reception processing. The connection request reception process is a process for receiving a connection request from the terminal device 100.

  The CPU 210 executes the connection determination module 2222 to construct a connection control unit and perform a connection determination process. The connection determination process is a process of determining whether to wirelessly connect to the terminal device 100 that transmits a connection request.

  Furthermore, the CPU 210 executes the detection signal notification program 223 to construct a notification unit and perform detection signal notification processing. The detection signal notification process is a process of notifying the terminal device 100 of a detection signal. The base station apparatus 200 includes all of the network identifiers stored in the identifier-communication bandwidth correspondence table 224 in the detection signal and notifies the terminal apparatus 100 of them. The detection signal to be notified includes, for example, all network identifiers ID1, ID2, and ID3 shown in FIG. Moreover, the base station apparatus 200 may notify the detection signal including the network identifier ID1, the detection signal including the network identifier ID2, and the detection signal including the network identifier ID3 as different detection signals. .

<Configuration example of terminal device>
FIG. 5 is a diagram illustrating a configuration example of the terminal device 100. The terminal device 100 includes a CPU 110, a storage 120, a memory 130 such as a DRAM, and an RF circuit 150.

  The storage 120 is an auxiliary storage device such as a flash memory, HDD, or SSD that stores programs and data. The storage 120 stores a communication program 121, a base station connection program 122, and an identifier-communication bandwidth correspondence table 123.

  The identifier-communication bandwidth correspondence table 123 is a table similar to the identifier-communication bandwidth correspondence table 224 stored in the storage 220 by the base station apparatus 200. The terminal device 100 and the base station device 200 share the correspondence between the network identifier and the communication bandwidth by storing the same table.

  The memory 130 is an area for loading a program stored in the storage 120. The memory 130 is also used as an area where the program stores data.

  The RF circuit 150 is a device that is wirelessly connected to the base station device 200. For example, the RF circuit 150 has an antenna and communicates with other communication devices by transmitting and receiving radio waves to and from the base station device 200 that is wirelessly connected.

  The CPU 110 executes communication processing by executing the communication program 121. The communication process is a process for communicating with the communication apparatus of the communication partner via the base station apparatus 200. In the communication process, the terminal device 100 transmits a packet to the communication device of the communication partner via the base station device 200, for example. In the communication process, the terminal device 100 receives a packet from the communication device of the communication partner via the base station device 200, for example.

  In addition, the CPU 110 executes the base station connection program 122 to construct a broadcast information reception unit and a request transmission unit, and performs a base station connection process. The base station connection process is a process of determining a base station apparatus 200 to be connected and performing wireless connection with the base station apparatus 200. The base station connection process includes a base station search process, a required communication bandwidth acquisition process, and a base station selection process, which will be described later.

  The CPU 210 executes the base station search module 1221 to construct a broadcast information receiving unit and perform base station search processing. The base station search process is a process of searching for a base station apparatus 200 to which the terminal apparatus 100 can wirelessly connect. In the base station search process, the terminal device 100 receives a detection signal that is broadcast (transmitted) by the base station device 200. The terminal device 100 detects the base station device 200 (or network) that can be wirelessly connected by acquiring a network identifier included in the detection signal received within a predetermined time.

  The CPU 210 executes the requested communication bandwidth acquisition module 1222 to perform a requested communication bandwidth acquisition process. The requested communication bandwidth acquisition process is a process for acquiring the requested communication bandwidth used by the terminal device 100 for communication. In the request communication bandwidth acquisition process, the terminal device 100 stores, for example, the measurement result of the throughput in the internal memory. Then, for example, the terminal device 100 regards the throughput within a predetermined period from the time when the connection request is transmitted to the base station device 200 as the throughput of communication executed after connecting to the base station device 200, and sets it as the requested communication bandwidth. get. Alternatively, for example, the terminal device 100 stores the throughput for each application, and calculates the average value of the measurement result of the throughput of the application used for communication or the numerical value obtained by multiplying the average value by a predetermined coefficient as the required communication bandwidth. Get as.

  The CPU 210 executes the base station selection module 1223 to construct a request transmission unit and perform base station selection processing. The base station selection obtaining process is a process in which the terminal device 100 selects the base station device 200 to be wirelessly connected and wirelessly connects. In the base station selection process, for example, the terminal apparatus 100 selects a network identifier to be connected based on the requested communication bandwidth from the identifiers of the base station apparatus 200 and the network detected in the base station search process. For example, the terminal device 100 transmits a connection request including the selected network identifier to the base station device 200 by broadcast.

<Base station connection processing>
FIG. 6 is a diagram illustrating an example of a sequence of base station connection processing in which the terminal device 100 that starts communication is wirelessly connected to the base station device 200. Assume that the identifier-communication bandwidth correspondence table 224 is in the state shown in FIG.

  The terminal device 100-1 performs a base station search process when starting communication (S101). In the base station search process, the terminal device 100-1 receives the detection signal transmitted by the base station device 200, and acquires the network identifier included in the detection signal. Hereinafter, a case where the network identifier is an ESSID will be described as an example.

  For example, the base station apparatus 200 periodically transmits a detection signal. The base station apparatus 200-1 broadcasts broadcast information (detection signal) including network identifiers ID1, ID2, and ID3, respectively (S102, S103, S104). Similarly, base station apparatus 200-2 broadcasts broadcast information including network identifiers ID1, ID2, and ID3 (S105, S106, S107).

  In the base station search process S101, the terminal device 100-1 receives the broadcast information S102 to S107, and detects the network identifiers ID1, ID2, and ID3 as connectable network identifiers.

  After completing the base station search process S101, the terminal device 100-1 performs a requested communication bandwidth acquisition process (S108). The terminal device 100-1 acquires the requested communication bandwidth in the requested communication bandwidth acquisition process.

  After completing the required communication bandwidth acquisition process S108, the terminal device 100-1 performs a base station selection process (S109).

  FIG. 7 is a diagram illustrating an example of a process flowchart of the base station selection process S109. The terminal device 100 selects a network identifier corresponding to the acquired requested communication bandwidth (S1091). If the acquired requested communication bandwidth is 50 Mbps or more (50 or more in S1091), the terminal device 100 selects the network identifier ID3 (S1092). 4, the communication bandwidth corresponding to the network identifier ID3 is 50 Mbps or more, and the terminal device 100 transmits a connection request including the network identifier ID corresponding to the communication bandwidth of 50 Mbps or more to the base station device 200. Similarly, when the required communication bandwidth is 20 Mbps or more and less than 50 Mbps (20 to 50 in S1091), the terminal device 100 selects the network identifier ID2 (S1093). Further, similarly, when the requested communication bandwidth is less than 20 Mbps (less than 20 in S1091), the terminal device 100 selects the network identifier ID1 (S1094).

  Then, the terminal device 100 transmits a connection request including the selected network identifier to the base station device 200 by broadcast.

  Returning to the sequence of FIG. 6, the terminal device 100-1 selects the network identifier ID3 because the acquired requested throughput (here, 60 Mbps, for example) is 50 Mbps or more (50 or more of S1091 of FIG. 7) ( S1092 in FIG. 7). Then, the terminal device 100-1 transmits a connection request including the selected network identifier ID3 to the base station devices 200-1 and 200-2 by broadcasting (S110). A dotted arrow in the sequence indicates that transmission is performed by broadcast.

  The base station devices 200-1 and 200-2 receive the connection request transmitted from the terminal device 100-1 and perform connection determination processing (S111).

  FIG. 8 is a diagram illustrating an example of a process flowchart of the connection determination process S111. The base station apparatus 200 waits for reception of a connection request (No in S1111). When receiving the connection request (Yes in S1111), the base station apparatus 200 acquires a network identifier included in the connection request (S1112).

  When the network identifier is ID1 (ID1 in S1112), the base station apparatus 200 determines whether the remaining allocatable communication bandwidth is greater than 0 Mbps (S1113). If the base station apparatus 200 can allocate a minimum value (excluding 0 Mbps) of the communication bandwidth corresponding to the network identifier ID1 (excluding 0 Mbps), that is, a communication bandwidth larger than 0 Mbps, the base station apparatus 200 can perform the requested communication of the terminal apparatus 100. It is determined that the bandwidth can be satisfied. When the remaining allocatable communication bandwidth is greater than 0 Mbps (Yes in S1113), the base station device 200 transmits a connection response including the network identifier ID1 to the terminal device 100 (S1114).

  On the other hand, when the remaining allocatable communication bandwidth is 0 Mbps or less (No in S1113), that is, when the remaining allocatable communication bandwidth is 0 Mbps, the base station apparatus 200 does not transmit a connection response and waits for reception of a connection request. It becomes.

  When the network identifier is ID2 (ID2 of S1112), the base station apparatus 200 determines whether the remaining allocatable communication bandwidth is 20 Mbps or more (S1115). If the base station device 200 can allocate a communication bandwidth of 20 Mbps or more, which is the minimum value of “20 Mbps or more and less than 50 Mbps”, which is the communication bandwidth corresponding to the network identifier ID2, the base station device 200 can increase the requested communication bandwidth of the terminal device 100. It is determined that it can be satisfied. When the remaining allocatable communication bandwidth is 20 Mbps or more (Yes in S1115), the base station apparatus 200 transmits a connection response including the network identifier ID2 to the terminal apparatus 100 (S1116).

  On the other hand, when the remaining allocatable communication bandwidth is less than 20 Mbps (No in S1115), the base station apparatus 200 does not transmit a connection response and waits for reception of a connection request.

  When the network identifier is ID3 (ID3 in S1112), the base station apparatus 200 determines whether the remaining allocatable communication bandwidth is 50 Mbps or more (S1117). If the base station device 200 can allocate a communication bandwidth of 50 Mbps or more which is the minimum value of “50 Mbps or more” which is the communication bandwidth corresponding to the network identifier ID3, the base station device 200 satisfies the requested communication bandwidth of the terminal device 100. It is determined that you can. When the remaining allocatable communication bandwidth is 50 Mbps or more (Yes in S1117), the base station apparatus 200 transmits a connection response including the network identifier ID3 to the terminal apparatus 100 (S1118).

  On the other hand, when the remaining allocatable communication bandwidth is less than 50 Mbps (No in S1117), the base station apparatus 200 does not transmit a connection response and waits for reception of a connection request.

  Returning to the sequence of FIG. 6, the base station devices 200-1 and 200-2 each perform connection determination processing (S111).

  FIG. 9 is a diagram illustrating an example of the provided communication bandwidth and the remaining allocatable communication bandwidth of the base station devices 200-1 and 200-2 when receiving a connection request from the terminal device 100-1. The communication bandwidth that can be allocated to the base station devices 200-1 and 200-2 is 100 Mbps.

  The base station apparatus 200-1 is connected to the terminal apparatus 100-2, and has allocated a communication bandwidth of 70 Mbps to the terminal apparatus 100-2. Therefore, the remaining allocatable communication standby width of the base station device 200-1 is 30 Mbps (100 Mbps-70 Mbps).

  Base station apparatus 200-2 is connected to terminal apparatuses 100-3 and 4 and has already been assigned a communication bandwidth of 20 Mbps to terminal apparatuses 100-3 and 4, respectively. Therefore, the remaining allocatable communication standby width of the base station apparatus 200-2 is 60 Mbps (100 Mbps− (20 Mbps + 20 Mbps)). Hereinafter, the connection determination process S111 of each of the base station apparatuses 200-1 and 2 will be described with reference to FIG.

  The base station apparatus 200-1 receives the connection request including the network identifier ID3 (Yes in S1111 in FIG. 8, ID3 in S1112), and determines whether the remaining allocatable communication bandwidth is 50 Mbps or more (FIG. 8). S1117). Since the remaining allocatable communication bandwidth is 30 Mbps and not more than 50 Mbps (No in S1117 in FIG. 8), the base station device 200-1 does not transmit a connection response.

  The base station device 200-2 receives the connection request including the network identifier ID3 (Yes in S1111 in FIG. 8, ID3 in S1112), and determines whether the remaining allocatable communication bandwidth is 50 Mbps or more (FIG. 8). S1117). The base station apparatus 200-1 transmits a connection response including the network identifier ID3 to the terminal apparatus 100-1 because the remaining allocatable communication bandwidth is 60 Mbps and is 50 Mbps or more (Yes in S1117 in FIG. 8) (S112). ).

  The terminal device 100-1 receives the connection response from the base station device 200-2, wirelessly connects to the base station device 200-2, and is in communication (S113).

  In addition, in the connection determination process S111 of FIG. 8, the base station apparatus 200 regards the minimum communication bandwidth corresponding to the network identifier as the requested communication bandwidth, but may regard the maximum value as the requested communication bandwidth. . In this case, the branch process S1113 in FIG. 8 is a process for determining whether the remaining allocatable communication bandwidth is 20 Mbps or more. Further, the branch processing S1115 in FIG. 8 is processing for determining whether the remaining allocatable communication bandwidth is 50 Mbps or more. The branch processing S1117 determines whether the communication bandwidth corresponding to the network identifier ID3 is equal to or greater than the assignable communication bandwidth (in this case, 100 Mbps), which is the maximum value that may be assigned. It becomes processing. By regarding the maximum value as the requested communication bandwidth, the terminal device 100 can be connected to the base station device 200 having a larger remaining allocatable communication bandwidth, and a throughput higher than the requested communication bandwidth is required. However, there is a high possibility that the communication bandwidth will not be insufficient.

  In the first embodiment, the terminal device 100 includes the requested communication bandwidth in the connection request, thereby causing the base station device 200 before the connection to recognize the requested communication bandwidth of the terminal device 100. And base station apparatus 200 is wirelessly connected to terminal apparatus 100 when the requested communication bandwidth can be allocated. As a result, the terminal device 100 can communicate with the base station device 200 that satisfies the required communication bandwidth, and a sufficient throughput can be obtained. In addition, since the base station apparatus 200 can recognize the requested communication bandwidth by receiving the connection request, the base station apparatus 200 does not make a connection that does not satisfy the requested communication bandwidth. Therefore, the terminal apparatus 100 can be connected to the base station apparatus 200 that satisfies the required communication bandwidth without performing unnecessary connection and disconnection, and can shorten the time until the start of communication.

[Second Embodiment]
Next, a second embodiment will be described. In the second embodiment, the connection request further includes an allowable delay time that indicates a transmission delay time of a packet that the base station device transmits in communication, which is permitted by the terminal device. The base station apparatus can provide the communication bandwidth corresponding to the candidate communication bandwidth information included in the connection request to the terminal apparatus that is the transmission source of the connection request, and the transmission delay time of the base station apparatus Is equal to or shorter than the allowable delay time included in the connection request, the wireless connection is made with the terminal device.

<Identifier-communication bandwidth correspondence table>
FIG. 10 is a diagram illustrating an example of the identifier-communication bandwidth correspondence table 224 according to the second embodiment. In the second embodiment, the base station device 200 and the terminal device 100 store the correspondence between the network identifier and the allowable delay time in addition to the correspondence between the network identifier and the communication bandwidth.

  The delay time is, for example, a time until the base station apparatus 200 transmits a packet received from the terminal apparatus 100 to the transmission destination, and the numerical value varies depending on the processing capability of the base station apparatus 200. For example, the delay time becomes shorter as the processing capability of the base station apparatus 200 is higher.

  The allowable delay time is, for example, a delay time that the terminal device 100 allows in communication. The terminal device 100 adjusts the amount of data transmitted / received per unit time, for example, assuming a delay time. When the delay time becomes longer than expected, the terminal device 100 may not be able to enjoy sufficient services due to delay in transmitting data to the communication partner device or delay in received data. Therefore, the terminal device 100 determines the assumed delay time or a value obtained by adding a margin to the assumed delay time as the allowable delay time. Then, the terminal apparatus 100 transmits a connection request including a network identifier corresponding to the requested communication bandwidth and the allowable delay time to the base station apparatus 200.

  For example, when the requested communication bandwidth of the terminal device 100 is 20 Mbps and the allowable delay time is 20 msec, the terminal device 100 transmits a connection request including the network identifier ID2. When the base station apparatus 200 receives the connection request including the network identifier ID2, if the remaining allocatable communication bandwidth is 20 Mbps or more and the delay time of the base station apparatus 200 is less than 20 msec, the base station apparatus 200 sends a connection response to the terminal apparatus 100. To establish a wireless connection with the terminal device 100.

  In the second embodiment, the base station apparatus 200 determines whether or not to connect to the terminal apparatus 100 in consideration of the allowable delay time in addition to the requested communication bandwidth. Thereby, the terminal device 100 can ensure sufficient throughput, can be connected to the base station device 200 that does not generate a delay time longer than expected, and can enjoy the service without delay.

  As mentioned above, the following additional remarks are disclosed regarding the embodiment including the first and second embodiments.

(Appendix 1)
A base station device included in a communication system having a plurality of terminal devices and a plurality of base station devices that wirelessly connect to each of the plurality of terminal devices and relay communication performed by the terminal devices,
A notifying unit that includes a plurality of candidate communication bandwidth information corresponding to a plurality of communication bandwidths provided to the terminal device, and that reports a detection signal for detecting a base station device to which the terminal device is wirelessly connectable; ,
A receiving unit that receives a connection request including candidate communication bandwidth information of any one of the plurality of candidate communication bandwidth information from the terminal device;
In response to the connection request, when the communication bandwidth corresponding to the candidate communication bandwidth information included in the connection request can be provided to the terminal device that is the transmission source of the connection request, the terminal device and the radio A connection control unit for performing connection,
The candidate communication bandwidth information included in the connection request corresponds to a communication bandwidth used for communication performed by the terminal device among the plurality of candidate communication bandwidth information included in the detection signal received by the terminal device. The base station device, which is candidate communication bandwidth information selected by the terminal device.

(Appendix 2)
The connection control unit is a terminal device other than a terminal device that transmits the connection request, and a provided communication bandwidth indicating a communication bandwidth provided to a connected terminal device that is wirelessly connected to the base station device The base station according to claim 1, wherein the base station determines whether or not a communication bandwidth corresponding to candidate communication bandwidth information included in the connection request can be provided to the terminal device that is the transmission source of the connection request apparatus.

(Appendix 3)
The connection control unit, the sum of the provided communication bandwidth and the communication bandwidth corresponding to the candidate communication bandwidth information included in the connection request does not exceed the communication bandwidth that can be provided by the base station device In the case, it is determined that a communication bandwidth corresponding to a candidate communication bandwidth included in the connection request can be provided to the terminal device that transmits the connection request.

(Appendix 4)
The connection request is a delay time from when the base station device relays the communication to when the received packet is transmitted after the reception of the packet, and indicates an allowance indicating the delay time allowed by the terminal device Including delay time,
The connection control unit is capable of providing a communication bandwidth corresponding to candidate communication bandwidth information included in the connection request to the terminal device that is a transmission source of the connection request, and the base station The base station apparatus according to supplementary note 1, wherein when the delay time of the apparatus is equal to or less than the allowable delay time included in the connection request, the terminal apparatus performs the wireless connection.

(Appendix 5)
The base station apparatus according to claim 1, wherein the candidate communication bandwidth information is a network identifier for identifying a network between the terminal apparatus and the base station apparatus used in short-range wireless communication.

(Appendix 6)
The base station apparatus according to supplementary note 1, wherein the notification unit includes the same identifier as the identifier that other base station apparatuses broadcast in the detection signal, in the detection signal.

(Appendix 7)
Furthermore, the base station apparatus of Claim 5 which has a memory | storage part which memorize | stores a response | compatibility with these some communication bandwidth and the said identifier.

(Appendix 8)
A terminal device included in a communication system having a plurality of terminal devices and a plurality of base station devices that wirelessly connect to each of the plurality of terminal devices and relay communication performed by the terminal device;
For detection for detecting a base station apparatus that can be wirelessly connected, including a plurality of candidate communication bandwidth information corresponding to a plurality of communication bandwidths provided to the terminal apparatus, which is reported by the base station apparatus A broadcast information receiving unit for receiving a signal;
Request transmission for transmitting a connection request including one candidate communication bandwidth corresponding to the communication bandwidth used for the communication among the plurality of candidate communication bandwidth information included in the received detection signal to the base station apparatus And
When the base station apparatus that has received the connection request can provide a communication bandwidth corresponding to candidate communication bandwidth information included in the connection request to the terminal apparatus by the connection request, the base station apparatus A terminal device that causes the terminal device to perform the wireless connection.

(Appendix 9)
A communication system including a plurality of terminal devices, and a plurality of base station devices that wirelessly connect to each of the plurality of terminal devices and relay communication performed by the terminal devices,
The base station device includes a plurality of candidate communication bandwidth information corresponding to a plurality of communication bandwidths provided to the terminal device, and a detection signal for detecting a base station device to which the terminal device can be wirelessly connected. , Inform,
The terminal device receives a detection signal broadcast by the base station device, and corresponds to a communication bandwidth used for the communication among the plurality of candidate communication bandwidth information included in the received detection signal A connection request including two candidate communication bandwidths is transmitted to the base station apparatus;
In response to the connection request, the base station apparatus can provide a communication bandwidth corresponding to candidate communication bandwidth information included in the connection request to the terminal apparatus that is the transmission source of the connection request. A communication system for performing the wireless connection with the terminal device.

(Appendix 10)
A communication method in a communication system having a plurality of terminal devices and a plurality of base station devices that wirelessly connect to each of the plurality of terminal devices and relay communication performed by the terminal devices,
The base station apparatus includes a plurality of candidate communication bandwidth information corresponding to a plurality of communication bandwidths provided to the terminal apparatus, and a detection signal for detecting a base station apparatus that can be wirelessly connected to the terminal apparatus. , Inform,
The terminal apparatus receives a detection signal broadcast by the base station apparatus, and corresponds to a communication bandwidth used for the communication among the plurality of candidate communication bandwidth information included in the received detection signal A connection request including two candidate communication bandwidths is transmitted to the base station apparatus;
When the base station apparatus can respond to the connection request and provide the communication bandwidth corresponding to the candidate communication bandwidth information included in the connection request to the terminal apparatus that is the transmission source of the connection request, A communication method for performing the wireless connection with the terminal device.

DESCRIPTION OF SYMBOLS 10 ... Communication system 100 ... Terminal device 110 ... CPU 120 ... Storage 121 ... Communication program 122 ... Base station connection program 1221 ... Base station search module 1222 ... Request communication bandwidth acquisition module 1223 ... Base station selection module 123 ... Communication bandwidth correspondence Table 130 ... Memory 150 ... RF circuit 200 ... Base station apparatus 210 ... CPU
220 ... Storage 221 ... Communication control program 222 ... Connection control program 2221 ... Connection request receiving module 2222 ... Connection determination module 223 ... Signal notification program for detection 224 ... Communication bandwidth correspondence table 230 ... Memory 234 ... Communication bandwidth correspondence table 240 ... NIC
250 ... RF circuit

Claims (7)

A base station device included in a communication system having a plurality of terminal devices and a plurality of base station devices that wirelessly connect to each of the plurality of terminal devices and relay communication performed by the terminal devices,
A notifying unit that includes a plurality of candidate communication bandwidth information corresponding to a plurality of communication bandwidths provided to the terminal device, and that reports a detection signal for detecting a base station device to which the terminal device is wirelessly connectable; ,
A receiving unit that receives a connection request including candidate communication bandwidth information of any one of the plurality of candidate communication bandwidth information from the terminal device;
In response to the connection request, when the communication bandwidth corresponding to the candidate communication bandwidth information included in the connection request can be provided to the terminal device that is the transmission source of the connection request, the terminal device and the radio A connection control unit for performing connection,
The candidate communication bandwidth information included in the connection request corresponds to a communication bandwidth used for communication performed by the terminal device among the plurality of candidate communication bandwidth information included in the detection signal received by the terminal device. The base station device, which is candidate communication bandwidth information selected by the terminal device. The connection control unit is a terminal device other than a terminal device that transmits the connection request, and a provided communication bandwidth indicating a communication bandwidth provided to a connected terminal device that is wirelessly connected to the base station device 2. The base according to claim 1, wherein the base station determines whether or not a communication bandwidth corresponding to the candidate communication bandwidth information included in the connection request can be provided to the terminal device that is the transmission source of the connection request. Station equipment. The base station apparatus according to claim 1, wherein the candidate communication bandwidth information is a network identifier that identifies a network between the terminal apparatus and the base station apparatus used in short-range wireless communication. The base station apparatus according to claim 1, wherein the notification unit includes and notifies the same identifier as the identifier that other base station apparatuses include and notify in the detection signal. A terminal device included in a communication system having a plurality of terminal devices and a plurality of base station devices that wirelessly connect to each of the plurality of terminal devices and relay communication performed by the terminal device;
For detection for detecting a base station apparatus that can be wirelessly connected, including a plurality of candidate communication bandwidth information corresponding to a plurality of communication bandwidths provided to the terminal apparatus, which is reported by the base station apparatus A broadcast information receiving unit for receiving a signal;
Request transmission for transmitting a connection request including one candidate communication bandwidth corresponding to the communication bandwidth used for the communication among the plurality of candidate communication bandwidth information included in the received detection signal to the base station apparatus And
When the base station apparatus that has received the connection request can provide a communication bandwidth corresponding to candidate communication bandwidth information included in the connection request to the terminal apparatus by the connection request, the base station apparatus A terminal device that causes the terminal device to perform the wireless connection. A communication system including a plurality of terminal devices, and a plurality of base station devices that wirelessly connect to each of the plurality of terminal devices and relay communication performed by the terminal devices,
The base station device includes a plurality of candidate communication bandwidth information corresponding to a plurality of communication bandwidths provided to the terminal device, and a detection signal for detecting a base station device to which the terminal device can be wirelessly connected. , Inform,
The terminal device receives a detection signal broadcast by the base station device, and corresponds to a communication bandwidth used for the communication among the plurality of candidate communication bandwidth information included in the received detection signal A connection request including two candidate communication bandwidths is transmitted to the base station apparatus;
In response to the connection request, the base station apparatus can provide a communication bandwidth corresponding to candidate communication bandwidth information included in the connection request to the terminal apparatus that is the transmission source of the connection request. A communication system for performing the wireless connection with the terminal device. A communication method in a communication system having a plurality of terminal devices and a plurality of base station devices that wirelessly connect to each of the plurality of terminal devices and relay communication performed by the terminal devices,
The base station apparatus includes a plurality of candidate communication bandwidth information corresponding to a plurality of communication bandwidths provided to the terminal apparatus, and a detection signal for detecting a base station apparatus that can be wirelessly connected to the terminal apparatus. , Inform,
The terminal apparatus receives a detection signal broadcast by the base station apparatus, and corresponds to a communication bandwidth used for the communication among the plurality of candidate communication bandwidth information included in the received detection signal A connection request including two candidate communication bandwidths is transmitted to the base station apparatus;
When the base station apparatus can respond to the connection request and provide the communication bandwidth corresponding to the candidate communication bandwidth information included in the connection request to the terminal apparatus that is the transmission source of the connection request, A communication method for performing the wireless connection with the terminal device.

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