WO2019146204A1

WO2019146204A1 - Terminal device, relay device, control method and program

Info

Publication number: WO2019146204A1
Application number: PCT/JP2018/040706
Authority: WO
Inventors: 幸一郎北川; 宏之新保
Original assignee: 株式会社Ｋｄｄｉ総合研究所
Priority date: 2018-01-29
Filing date: 2018-11-01
Publication date: 2019-08-01
Also published as: JP6879955B2; JP2019134225A

Abstract

A terminal device capable of performing wireless communication in parallel between a plurality of base station devices while under the control of a first base station device among the plurality of base station devices, the terminal device being configured so as to: receive information about a base station device to be measured by a relay device from a relay device which is a switching candidate for a connection from the second base station device, is capable of relaying communication to and from the base station device, and has received notification from the base station device to which the relay device is connected, during a period when communication is being executed in parallel between the first and second base station devices among the plurality of base station devices; and control so as to allow a connection to be established with the relay device when the second base station device is included among the base station devices to be measured, and so as not to allow a connection to be established with the relay device when the second base station device is not included among the base station devices to be measured.

Description

Terminal device, relay device, control method, and program

The present invention relates to a terminal device, a relay device, a control method, and a program, and more particularly to communication control technology when the terminal device communicates with a plurality of base station devices.

As described in Non-Patent Document 1, in 3GPP (3rd Generation Partnership Project), a terminal apparatus communicates with a first base station apparatus and a second under the control of the first base station apparatus. Techniques for performing communication with a base station apparatus in parallel are standardized. Such parallel communication is called dual connectivity. Non-Patent Document 1 further stipulates that a relay apparatus (for example, a terminal apparatus) relays communication between a base station apparatus and a terminal apparatus.

In Dual Connectivity, it is assumed that relay communication is used. That is, the terminal device performs communication with the first base station device and communication with the relay device connected to the second base station device under control of the first base station device in parallel. sell. In this configuration, it is conceivable that the terminal device switches the connection (performs handover) from the first relay device to the second relay device. When connection switching is performed, it is necessary to transfer data, which should have been transmitted by the first relay device, to the second relay device. For example, as shown in FIG. 1, the terminal device 101 is connected to the first base station device 102 and connected to the second base station device 103 via the first relay device 104 (for example, another terminal device). It shall be done. From this state, the terminal device 101 maintains the connection with the first base station device 102, while the connection with the second base station device 103 via the first relay device 104 is the second relay device. It is possible to switch to the connection with the third base station apparatus 111 via 112. In this case, it is necessary to transfer data to be transmitted to the terminal device 101 from the first base station apparatus 102 or the second base station apparatus 103 to the third base station apparatus 111.

In the situation as described above, the terminal device 101 may exist outside the range of the cell formed by the third base station device 111, and in this case, the cell and the third cell formed by the first base station device 102 may be used. There is a case where there is no adjacency with the cell formed by the base station apparatus 111. In such a relationship between base station apparatuses, it is assumed that the first base station apparatus 102 does not establish a communication link with the third base station apparatus 111. Also, it may be assumed that the second base station apparatus 103 does not establish a communication link with the third base station apparatus 111. As a result, when the connection in the terminal apparatus is switched, data to be transmitted to the terminal apparatus to the third base station apparatus 111 can not be transferred, and the data may not be transmitted to the terminal apparatus.

The present invention provides a technique for facilitating data transfer at the time of connection switching when relay communication is used when a terminal device performs a plurality of wireless links.

A terminal device according to an aspect of the present invention is a terminal capable of performing radio communication in parallel with a plurality of base station devices under control of a first base station device of the plurality of base station devices. An apparatus, wherein, while communication between the first base station apparatus and the second base station apparatus among the plurality of base station apparatuses is being executed in parallel, the second base A relay device that is a switching candidate for connection from a station device and notified from the base station device to which the relay device is connected to the relay device from the relay device capable of relaying communication with the base station device Receiving means for receiving information of the base station apparatus to be measured by the relay apparatus, and allowing establishment of connection with the relay apparatus when the second base station apparatus is included in the base station apparatus to be measured The second base station apparatus is the base station apparatus to be measured And a control means for controlling so as not to permit the establishment of a connection with the relay device when the rare absence.

Also, a terminal device according to another aspect of the present invention performs wireless communication in parallel with a plurality of base station devices under the control of a first base station device of the plurality of base station devices. A terminal device capable of performing communication between the first base station device and the second base station device among the plurality of base station devices in parallel; Reception of information on a base station apparatus to which the relay apparatus is connected from a relay apparatus that is a relay apparatus that is a switching candidate for connection from the second base station apparatus and that can relay communication with the base station apparatus To the base station apparatus to be measured notified of from the second base station apparatus to another apparatus relaying communication with the terminal apparatus or the second base station apparatus; Of the connection with the relay apparatus when the base station apparatus to which the Control means for permitting the establishment and not controlling the establishment of the connection with the relay device when the base station device to be measured does not include the base station device connected to the relay device; Have.

Also, a relay device according to an aspect of the present invention is a relay device capable of relaying communication between a base station device and a terminal device, and from the base station device to which the relay device is connected, It has a receiving means which receives the information of the base station apparatus of the measurement object of the radio | wireless quality by the said relay apparatus, The transmission means which transmits the information of the base station apparatus of the said measurement object by a alerting signal.

According to the present invention, it is possible to facilitate data transfer at the time of connection switching in the case of using relay communication when the terminal device performs a plurality of wireless links.

Other features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings. In the attached drawings, the same or similar configurations are denoted by the same reference numerals.

The accompanying drawings are included in the specification, constitute a part thereof, show embodiments of the present invention, and are used together with the description to explain the principle of the present invention.
It is a figure which shows the structural example of a radio | wireless communications system. It is a figure showing the example of hardware constitutions of an apparatus. It is a block diagram showing an example of functional composition of a terminal unit. It is a block diagram showing an example of functional composition of a relay device. It is a figure which shows the 1st example of the flow of the process performed by a radio | wireless communications system. It is a figure which shows the 2nd example of the flow of the process performed by a radio | wireless communications system.

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

(System configuration)
The radio communication system according to the present embodiment has a configuration as shown in FIG. 1 as one aspect. Then, while maintaining the connection with the first base station apparatus 102, the terminal apparatus 101 can connect the second relay apparatus 112 with the second base station apparatus 103 via the first relay apparatus 104. It is assumed that switching is made to connection with the third base station apparatus 111 via the connection.

In this embodiment, in such a system, whether or not the first base station apparatus 102 and the third base station apparatus 111 include each other in the adjacent base station list (adjacent cell list) in the own apparatus. Thus, the terminal device 101 controls whether or not to switch the connection. Here, with respect to the devices under connection (for example, the first relay device 104 and the second relay device 112), each base station device is connected to the adjacent base station (adjacent cell list) (adjacent cell list). The information of the cell) is notified as a base station apparatus of the wireless quality measurement target. The information of the base station may be, for example, an identifier of the base station or an identifier of a cell formed by the base station.

The terminal device 101 acquires the information of the measurement target base station device notified from the third base station device 111 to the second relay device 112, and the information of the second base station device 103 currently connected is It is determined whether it is included in the base station apparatus to be measured. That is, since the base station apparatus that the third base station apparatus 111 treats as an adjacent base station is the target of measurement of the wireless quality by the second relay apparatus 112, the terminal apparatus 101 performs the second relay Whether the third base station apparatus 111 and the second base station apparatus 103 are in an adjacent relationship by determining whether the second base station apparatus 103 is included in the base station apparatus to be measured by the apparatus 112 Determine Similarly, the terminal device 101 determines whether the first base station device 102 is included in the base station device to be measured by the second relay device 112, thereby the third base station device 111 and the third base station device 111 are It is possible to determine whether one base station apparatus 102 is in an adjacent relationship. In one example, when the first base station apparatus 102 manages a data path related to transmission of data from the second base station apparatus 103 to the terminal apparatus 101, the terminal apparatus 101 performs the third process. It is determined whether the base station apparatus 111 and the first base station apparatus 102 are in an adjacent relationship, and if the first base station apparatus 102 does not manage the data path, the third base station apparatus 111 is determined. And the second base station apparatus 103 can be determined to be adjacent to each other.

Also, the terminal device 101 acquires the information of the measurement target base station device notified from the second base station device 103 to the first relay device 104, and the information of the second relay device 112 which is a connection switching candidate. May be determined to be included in the measurement target base station apparatus. That is, since the base station apparatus that the second base station apparatus 103 treats as an adjacent base station is the base station apparatus whose wireless quality is to be measured by the first relay apparatus 104, the terminal apparatus 101 performs the first relay Whether the second base station apparatus 103 and the third base station apparatus 111 are in an adjacent relationship by determining whether the third base station apparatus 111 is included in the base station apparatus to be measured by the apparatus 104 Determine Similarly, the terminal device 101 determines whether the third base station device 111 is included in the base station device to be measured notified from the first base station device 102 to the terminal device 101. It can be determined whether one base station apparatus 102 and the third base station apparatus 111 are in an adjacent relationship.

When the terminal device 101 determines that the third base station device 111 and the first base station device 102 or the second base station device 103 do not have an adjacency relationship, the third base station device Control is performed so as not to allow switching of the connection to the second relay device 112 connected to 111. On the other hand, when the terminal device 101 determines that the third base station device 111 and the first base station device 102 or the second base station device 103 are in an adjacent relationship, the third base station device Control is performed to allow switching of the connection to the second relay device 112 connected to 111. According to this, the terminal device 101 is connected to a base station device (the base station device that is not adjacent to the current connection destination base station device (the first base station device 102 or the second base station device 103) Switching of connection to the relay device) is not performed. According to this, the base station apparatus of the current connection destination can not transfer the transmission target data to the terminal apparatus 101, or the transfer of the transmission target data takes a very long time to another base station apparatus. Can be prevented from connecting.

Below, the structural example of the terminal device 101 and a relay apparatus (1st relay apparatus 104 and 2nd relay apparatus 112) and the example of the flow of the process performed by these apparatuses are demonstrated. The base station apparatus has a configuration of a general base station apparatus, and it is sufficient to execute the processing of the conventional base station apparatus, and thus detailed description thereof will be omitted.

(Example of hardware configuration of device)
FIG. 2 shows an example of the hardware configuration of the terminal device and the relay device. Each device, in one example, has a hardware configuration as shown in FIG. 2, and includes, for example, a CPU 201, a ROM 202, a RAM 203, an external storage device 204, and a communication device 205. In each device, for example, a program for realizing each function of each device as described above, which is recorded in any of the ROM 202, the RAM 203, and the external storage device 204, is executed by the CPU 201.

Then, each device controls the communication device 205 by, for example, the CPU 201 to communicate with other devices. For example, the communication device 205 of the terminal device and the relay device may be the fourth generation LTE or the fifth generation NR with the base station device or another device (for example, the relay device for the terminal device, the terminal device for the relay device). Wireless communication based on the communication standard such as In addition, in the structure of FIG. 2, although each apparatus has shown the schematic as having one communication apparatus 205, it is not restricted to this. For example, the terminal device may have a plurality of communication devices, and two connections by Dual Connectivity may be performed using separate communication devices. Also, the relay device may have two communication devices for communication with the terminal device and communication with the base station device.

Each device may be provided with dedicated hardware for executing each function, or a part of the device may be executed by hardware, and the other part may be executed by a computer that operates a program. Also, all functions may be performed by a computer and a program.

The relay apparatus may be an apparatus dedicated to relay between the base station apparatus and the terminal apparatus, or, for example, the terminal apparatus may operate as the relay apparatus.

(Functional configuration of terminal device)
FIG. 3 shows an example of the functional configuration of the terminal device 101 according to the present embodiment. The terminal device 101 includes a communication unit 301, a switching candidate information acquisition unit 302, a switching determination unit 303, and a switching control unit 304 as an example of the functional configuration. In addition, although the terminal device 101 has the other function which a general terminal device has, in order to simplify description here, it has abbreviate | omitted about such a function.

The communication unit 301 establishes a plurality of wireless connections by at least Dual Connectivity, and performs communication on a plurality of wireless links in parallel. Here, the communication unit 301 establishes a connection with the first base station apparatus 102, and based on the control communication performed with the first base station apparatus 102, with the second base station apparatus 103. The connection between them is established via the first relay device 104. Note that the communication unit 301 is the information (base station apparatus identifier or information of the base station apparatus) of the connected base station apparatus (the first base station apparatus 102 and the second base station apparatus 103) according to a general cellular communication procedure. Get the identifier of the cell formed by the device). Also, the communication unit 301 is, for example, a base station apparatus registered from the first base station apparatus 102 in the base station apparatus to be measured (the adjacent base station list (adjacent cell list) of the first base station apparatus 102). Or, the information on the cell) can be acquired as the information on the base station apparatus adjacent to the first base station apparatus 102. Further, the communication unit 301 is registered from the first relay apparatus 104 in the base station apparatus (the adjacent base station list (adjacent cell list) of the second base station apparatus 103) to be measured by the first relay apparatus 104. Information on a certain base station apparatus or cell) can be acquired as information on a base station apparatus adjacent to the second base station apparatus 103. The communication unit 301 may obtain this information directly from the second base station apparatus 103.

The switching candidate information acquisition unit 302 acquires information of switching destination candidates of the currently established connection (for example, the second relay apparatus 112 and the third base station apparatus 111). In one example, the switching candidate information acquisition unit 302 acquires, using the communication unit 301, information of base station apparatuses registered as adjacent in the base station apparatus from the connection switching destination candidate base station apparatuses. . Also, the switching candidate information acquisition unit 302 is a base station apparatus registered from the relay apparatus of the connection switching destination candidate using the communication unit 301 as being adjacent in the base station apparatus to which the relay apparatus is connected. Get information on For example, the switching candidate information acquisition unit 302 is a base station device that is a measurement target of the wireless quality designated by the third base station device 111 directly from the third base station device 111 or via the second relay device 112. (For example, an identifier of a base station apparatus or an identifier of a cell formed by the base station apparatus). In this case, the base station to be measured specified by the third base station 111 corresponds to the adjacent base station of the third base station 111.

Also, the switching candidate information acquisition unit 302 acquires information on the base station apparatus from the connection switching destination candidate base station apparatus or from the base station apparatus connected to the base station apparatus. For example, the switching candidate information acquisition unit 302 may use the identifier of the third base station apparatus 111 from the third base station apparatus 111 or the second relay apparatus 112 connected to the third base station apparatus 111. And information on the identifier of the cell formed by the third base station apparatus 111.

The switching determination unit 303 allows switching of the connection to the switching destination candidate based on the switching destination candidate information acquired by the switching candidate information acquisition unit 302 and the information of the currently connected base station apparatus. It is determined whether or not.

For example, when the switching candidate information acquisition unit 302 acquires information on the measurement target base station device specified by the third base station device 111, the switching determination unit 303 uses the information on the measurement target base station device as: When the information of the second base station apparatus 103 notified from the first relay apparatus 104 is included, the connection with the first relay apparatus 104 can be performed using the third base station apparatus 111 or the second relay. It is determined that switching to the connection with the device 112 is permitted. On the other hand, when the information of the second base station apparatus 103 is not included in the information of the base station apparatus to be measured, the switching determination unit 303 performs the third base station connection with the first relay apparatus 104. It is determined that switching to the connection with the device 111 or the second relay device 112 is not permitted. Similarly, when the switching candidate information acquisition unit 302 acquires information on the measurement target base station device specified by the third base station device 111, the switching determination unit 303 uses the information on the measurement target base station device. Switching the connection with the first relay device 104 to the connection with the third base station device 111 or the second relay device 112 depending on whether the information of the first base station device 102 is included or not. It can be determined whether to allow or not.

In addition, when the switching candidate information acquisition unit 302 acquires information on the third base station apparatus 111, the switching determination unit 303 is designated by the second base station apparatus 103 acquired from the first relay apparatus 104. When the information on the base station apparatus to be measured by the first relay apparatus 104 includes the information on the third base station apparatus 111, the connection with the first relay apparatus 104 can be performed using the third base station It is determined that switching to connection with the device 111 or the second relay device 112 is permitted. On the other hand, when the information on the base station apparatus to be measured by the first relay apparatus 104 does not include the information on the third base station apparatus 111, the switching determination unit 303 establishes connection with the first relay apparatus 104. It is determined that switching to the connection with the third base station apparatus 111 or the second relay apparatus 112 is not permitted. Similarly, when the switching candidate information acquisition unit 302 acquires the information of the third base station apparatus 111, the switching determination unit 303 sets the information of the measurement target base station apparatus specified by the first base station apparatus 102. Switch the connection with the first relay device 104 to the connection with the third base station device 111 or the second relay device 112 depending on whether the information of the third base station device 111 is included or not. It can be determined whether to allow or not.

Note that whether the switching determination unit 303 makes the above determination based on which information of the first base station apparatus 102 and the second base station apparatus 103 is, for example, when transmitting data to the terminal apparatus 101. It can be determined depending on whether the first base station apparatus 102 manages a data path indicating a transmission path. For example, when the first base station apparatus 102 manages a data path, the switching determination unit 303 can perform the above-described determination based on the information of the first base station apparatus 102. On the other hand, when the second base station apparatus 103, the third base station apparatus 111, or the higher order apparatus manages the data path, the switching determination unit 303 determines the information based on the information of the second base station apparatus 103. The above determination can be made.

When the switching control unit 304 determines that the switching determination unit 303 permits connection switching, the connection with the first relay device 104 established by the communication unit 301 can be performed using the third base station apparatus 111 or the third base station apparatus 111. A switching process to switch to the connection with the second relay device 112 is executed.

In the above description, although an example in which the terminal device 101 is connected to the second base station device 103 via the first relay device 104 has been described, the present invention is not limited thereto. For example, the terminal device 101 may be directly connected to the second base station device 103. That is, a configuration in which the terminal device 101 can receive information for determining whether the first base station device 102 or the second base station device 103 and the third base station device 111 are in an adjacent relationship. If it is, the terminal device 101 may be changed from the above-mentioned configuration as long as it is.

(Functional configuration of relay device)
FIG. 4 shows an example of the functional configuration of the relay apparatus (the first relay apparatus 104 and the second relay apparatus 112) according to this embodiment. The relay device includes, in one example, a relay communication unit 401 and a base station information transmission unit 402. Note that the relay device may be realized by a terminal device, and in this case, the terminal device can have both the functions of FIG. 3 and FIG. 4. Also, the relay device may be a fixed or mobile relay device. The relay apparatus has other functions that a general communication apparatus has, but such functions are omitted here for the sake of simplicity.

The relay communication unit 401 performs communication for relaying at least wireless communication between the base station apparatus (the second base station apparatus 103 and the third base station apparatus 111) and the terminal apparatus 101. The relay communication unit 401 is assumed to be capable of relaying communication between devices by, for example, regenerative relay (and in some cases non-regenerative relay).

The base station information transmission unit 402 transmits the information of the connected base station apparatus, the information of the measurement target base station apparatus specified by the base station apparatus, and the like to the terminal apparatus 101 via the relay communication unit 401. . For example, the base station information transmission unit 402 of the first relay device 104 sends the information (the identifier of the base station device or the identifier of the cell formed by the base station device) of the second base station device 103 to the terminal device 101. Notice. Further, the base station information transmission unit 402 of the second relay apparatus 112 sends the information of the third base station apparatus 111 (the identifier of the base station apparatus or the identifier of the cell formed by the base station apparatus) to the terminal apparatus 101. It can notify. Note that the base station information transmission unit 402 of the first relay device 104 is the measurement target of the wireless quality notified from the second base station device 103 to the first relay device 104 (or the terminal device 101). The information on the base station apparatus is notified to the terminal apparatus 101. Similarly, the base station information transmission unit 402 of the second relay apparatus 112 receives information on the wireless quality measurement target base station apparatus notified from the third base station apparatus 111 to the second relay apparatus 112. Can be notified to the terminal device 101. The base station information transmission unit 402 uses, for example, the connection to the connected terminal apparatus, information of the connected base station apparatus and the measurement target base designated by the base station apparatus. Notify station equipment. On the other hand, the base station information transmission unit 402 transmits, for example, such information as a signal that can be received by a terminal apparatus that has not established a connection, such as a synchronization signal or a broadcast signal, to the terminal apparatus that is not connected. sell.

(Flow of processing)
Then, the example of the flow of the process performed with the radio | wireless communications system containing the above-mentioned terminal device and relay apparatus is demonstrated. FIG. 5 shows a first example of the flow of processing performed in the wireless communication system.

First, it is assumed that the terminal device 101 establishes a connection with the second base station device 103 via the first relay device 104 under the control of the first base station device 102 (S501). . At this time, the first relay apparatus 104 notifies the terminal apparatus 101 of the information of the second base station apparatus 103 to which the first relay apparatus 104 is connected (S502). Also, the terminal device 101 performs data communication with the second base station device 103 via the first relay device 104 (S503). The first relay apparatus 104 holds, for example, the information of the second base station apparatus 103 in advance, and notifies the terminal apparatus 101 of the information of the second base station apparatus 103 during connection establishment processing. You may Also, the terminal device 101 may establish a direct connection with the second base station device 103 without passing through the relay device. In this case, when the connection with the second base station device 103 is established, Information of the second base station apparatus 103 is acquired by a signal or data communication which is separately transmitted after that. Note that, based on control communication with the first base station apparatus 102, the terminal apparatus 101 is connected with the second base station apparatus 103 (regardless of whether or not the first relay apparatus 104 is used). Can be established and data communication can be performed with the second base station apparatus 103. Data to be transmitted to the terminal device 101 may be transmitted from the first base station apparatus 102 to the second base station apparatus 103 (via an inter-base station communication link such as X2 or Xn) (for example, It may be transmitted to the second base station apparatus 103 without passing through the first base station apparatus 102 from a higher order apparatus or the like. A path indicating a data transmission path at this time is called a data path, and when the data path passes through the first base station apparatus 102, the first base station apparatus 102 can be a node that performs data path management. In addition, when the data path does not pass through the first base station apparatus 102, the second base station apparatus 103, the third base station apparatus 111, the higher order apparatus and the like can be nodes that perform data path management. When the first base station apparatus 102 manages the data path, the terminal apparatus 101 may not obtain the information of the second base station apparatus 103, and instead, the first base station apparatus 102 may The information of the base station apparatus 102 can be acquired. That is, the terminal device 101 may perform the process of S502 only when the first base station apparatus 102 does not manage the data path.

Thereafter, the terminal device 101 moves to deteriorate the wireless environment with the first relay device 104, and at the same time, reaches a position where the wireless signal from the second relay device 112 can be received sufficiently strongly. It shall be. At this time, the second relay apparatus 112 receives a measurement instruction of wireless quality from the third base station apparatus 111 (S 504), and based on the measurement instruction, the adjacent base station in the third base station apparatus 111 The radio quality is measured for the base station apparatus registered as a station. The second relay apparatus 112 notifies the third base station apparatus 111 of the measurement result of the wireless quality (S506). In addition, the second relay device 112 periodically transmits, for example, a broadcast signal or a synchronization signal, information on a base station device registered as an adjacent base station in the third base station device 111 designated by the measurement instruction. To do (S505). The terminal device 101 can receive the notification signal and the synchronization signal in response to the situation where the wireless signal from the second relay device 112 can be received sufficiently strongly. Then, the terminal device 101 acquires, from the received signal, the information of the base station device registered as the adjacent base station in the third base station device 111, and in the information, the current connection acquired in S502 is established. It is determined whether the information of the second base station apparatus 103 in the inside is included. The terminal device 101 determines whether to permit switching of the connection from the first relay device 104 (or the second base station device 103) to the second relay device 112 according to the determination result ( S507). For example, when the second base station apparatus 103 is included in a base station apparatus registered as an adjacent base station in the third base station apparatus 111, the terminal apparatus 101 determines to allow connection switching. That is, when the second base station apparatus 103 and the third base station apparatus 111 are in an adjacent relationship, switching of the connection from the first relay apparatus 104 to the second relay apparatus 112 is permitted. On the other hand, when the second base station apparatus 103 is not included in the base station apparatus registered as the adjacent base station in the third base station apparatus 111, the terminal apparatus 101 determines that the connection switching is not permitted. . Thereby, the communication link between the base stations is established, and the connection is switched when the target data to the terminal device 101 can be transferred at high speed from the switching source base station device to the switching destination candidate base station device. Will be done.

FIG. 6 shows a second example of the flow of processing performed in the wireless communication system. Also in this example, it is assumed that the terminal device 101 is connected and in communication with the second base station device 103 via the first relay device 104 under the control of the first base station device 102. S601, S602). Then, in the terminal device 101, the first relay device 112 specified by the second base station device 103 to which the first relay device 104 is connected measures the radio quality from the first relay device 104. The information of the base station apparatus to be obtained is acquired (S603). Here, it should be noted that not the information of the second base station apparatus 103 but the information of the base station apparatus to be measured is acquired. On the other hand, it is assumed that the second relay apparatus 112 also establishes a connection with the third base station apparatus 111 (S604). At this time, the second relay apparatus 112 sends out the information of the third base station apparatus 111 by, for example, a broadcast signal or a synchronization signal (S605). The terminal device 101 can receive this signal in response to a situation in which the wireless signal from the first relay device 112 can be received sufficiently strongly. When the terminal device 101 receives this signal, the information of the third base station device 111 acquired from the second relay device 112 is included in the information of the base station device whose wireless quality is to be measured by the first relay device 104. Determine if it is included. The terminal device 101 determines whether to permit switching of the connection from the first relay device 104 (or the second base station device 103) to the second relay device 112 according to the determination result ( S606). For example, when the third base station apparatus 111 is included in a base station apparatus registered as an adjacent base station in the second base station apparatus 103, the terminal apparatus 101 determines to allow connection switching. That is, when the third base station apparatus 111 and the second base station apparatus 103 are in an adjacent relationship, switching of the connection from the first relay apparatus 104 to the second relay apparatus 112 is permitted. On the other hand, when the third base station apparatus 111 is not included in the base station apparatus registered as the adjacent base station in the second base station apparatus 103, the terminal apparatus 101 determines that the connection switching is not permitted. . Thereby, the communication link between the base stations is established, and the connection is switched when the target data to the terminal device 101 can be transferred at high speed from the switching source base station device to the switching destination candidate base station device. Will be done.

In the above description, although the case where the data path management is performed by a device different from the first base station device 102 has been described, when the first base station device 102 manages the data path, the second base When the first base station apparatus 102 executes the process described as being performed by the station apparatus 103 and the first relay apparatus 104, the same effect as the above-described process can be obtained. That is, whether or not the first base station apparatus 102 and the third base station apparatus 111 are adjacent to each other is determined based on the third base station apparatus to be measured designated by the first base station apparatus 102. It is determined by determining whether the station apparatus 111 is included or the first base station apparatus 102 is included in the measurement target base station apparatus specified by the third base station apparatus 111. . Then, the terminal device 101 transmits the first relay device 104 to the second relay device 112 according to whether or not the first base station device 102 and the third base station device 111 are in an adjacent relationship. It may be determined whether to allow connection switching.

In the above description, although the case where the first relay device 104 and the second relay device 112 are connected to one base station device has been described, these relay devices are not limited to a plurality of base station devices. It can be connected. In this case, the terminal device 101 is adjacent to any one of the base station devices to which the first relay device 104 is connected and any of the base station devices to which the second relay device 112 is connected. It may be determined that switching of the connection from one relay apparatus 104 to the second relay apparatus 112 is permitted. In addition, the terminal device 101 is the first one when all of the base station devices to which the first relay device 104 is connected are adjacent to any of the base station devices to which the second relay device 112 is connected. It may be determined that switching of the connection from the relay device 104 to the second relay device 112 is permitted. Also, for example, when the second relay device 112 is connected to a plurality of base station devices, with the second base station device 103 (or the first base station device 102) among the plurality of base station devices Data to be transmitted to the terminal device 101 may be transferred to the base station device in an adjacent relationship, and the other data may be distributed to other base station devices. In addition, when the plurality of base station apparatuses to which the second relay apparatus 112 is connected are adjacent to the second base station apparatus 103 (or the first base station apparatus 102), the bases which are in the adjacent relation to each other. Among the station apparatuses, data to be transmitted to the terminal apparatus 101 may be transferred to the base station apparatus having the best communication quality up to the second relay apparatus 112.

In addition, when a plurality of relay apparatuses and base stations become switching destination candidates for the connection, the terminal apparatus 101 is a partner apparatus that is permitted to switch the connection among these connection switching destination candidates, and the radio quality is the highest. The connection destination may be switched by selecting a partner apparatus whose good or wireless quality meets a predetermined quality.

With the above-described configuration and processing, it is possible to facilitate data transfer at the time of connection switching in the case of using relay communication when the terminal device performs a plurality of wireless links.

The present invention is not limited to the above embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Accordingly, the following claims are attached to disclose the scope of the present invention.

The present application claims priority based on Japanese Patent Application No. 2018-015201, filed Jan. 29, 2018, the entire content of which is incorporated herein by reference.

Claims

A terminal apparatus capable of performing radio communication in parallel with a plurality of base station apparatuses under the control of a first base station apparatus among the plurality of base station apparatuses,
Among the plurality of base station apparatuses, while communication is being performed in parallel between the first base station apparatus and the second base station apparatus, connection from the second base station apparatus A relay device that is a switching candidate for switching between the relay devices that can relay communication with the base station device, and measurement by the relay device notified from the base station device to which the relay device is connected to the relay device Receiving means for receiving information of a target base station apparatus;
When the second base station apparatus is included in the measurement target base station apparatus, establishment of connection with the relay apparatus is permitted, and the second base station apparatus is included in the measurement target base station apparatus. Control means for performing control so as not to allow establishment of a connection with the relay device when there is no
A terminal device characterized by having.
When the communication with the second base station apparatus is relayed by another apparatus, the receiving means receives information of the second base station apparatus from the other apparatus.
The terminal device according to claim 1, characterized in that:
A terminal apparatus capable of performing radio communication in parallel with a plurality of base station apparatuses under the control of a first base station apparatus among the plurality of base station apparatuses,
Among the plurality of base station apparatuses, while communication is being performed in parallel between the first base station apparatus and the second base station apparatus, connection from the second base station apparatus Receiving means for receiving information on the base station apparatus to which the relay apparatus is connected, from the relay apparatus that is a switching candidate for switching and capable of relaying communication with the base station apparatus;
The relay apparatus is connected to a measurement target base station apparatus notified of from the second base station apparatus to another apparatus relaying communication with the terminal apparatus or the second base station apparatus. Allows the establishment of connection with the relay apparatus when the base station apparatus included is included, and the base station apparatus to be measured does not include the base station apparatus to which the relay apparatus is connected. Control means for performing control so as not to allow establishment of a connection with
A terminal device characterized by having.
The receiving means receives the information according to a notification signal from the relay device.
The terminal device according to claim 1 or 3, characterized in that:
A relay apparatus capable of relaying communication between a base station apparatus and a terminal apparatus, comprising:
Receiving means for receiving, from the base station apparatus to which the relay apparatus is connected, information on a base station apparatus whose wireless quality is to be measured by the relay apparatus;
Transmitting means for transmitting information of the base station apparatus to be measured by a broadcast signal;
The relay apparatus characterized by having.
A control method of a terminal apparatus capable of performing radio communication in parallel with a plurality of base station apparatuses under the control of a first base station apparatus among the plurality of base station apparatuses,
The second base station while the receiving means is executing communication between the first base station and the second base station in parallel among the plurality of base stations. A relay device that is a switching candidate for connection from the device and notified from the base station device to which the relay device is connected to the relay device from the relay device capable of relaying communication with the base station device A receiving step of receiving information of a base station to be measured by the relay device;
The control means permits establishment of connection with the relay device when the second base station device is included in the measurement target base station device, and the second base station device is the measurement target base station A control step of performing control so as not to allow establishment of a connection with the relay device if not included in the device;
A control method characterized by comprising:
A control method of a terminal apparatus capable of performing radio communication in parallel with a plurality of base station apparatuses under the control of a first base station apparatus among the plurality of base station apparatuses,
The second base station while the receiving means is executing communication between the first base station and the second base station in parallel among the plurality of base stations. A receiving step of receiving information on a base station apparatus to which the relay apparatus is connected from the relay apparatus that is a relay apparatus that is a switching candidate for connection from the apparatus and capable of relaying communication with the base station apparatus;
The control unit relays from the second base station apparatus to the measurement target base station apparatus notified to another apparatus relaying communication with the terminal apparatus or the second base station apparatus. When a base station apparatus to which the apparatus is connected is included, establishment of connection with the relay apparatus is permitted, and a base station apparatus to which the relay apparatus is connected is not included in the base station apparatus to be measured Control step of performing control so as not to allow establishment of connection with the relay device;
A control method characterized by comprising:
A control method of a relay apparatus capable of relaying communication between a base station apparatus and a terminal apparatus, comprising:
A receiving step of receiving, from the base station apparatus to which the relay apparatus is connected, information of a base station apparatus for which the relay apparatus is to measure a wireless quality;
A transmitting step of transmitting information of the base station device to be measured by a broadcast signal;
A control method characterized by comprising:
A computer provided in a terminal apparatus capable of performing wireless communication in parallel with a plurality of base station apparatuses under the control of a first base station apparatus among the plurality of base station apparatuses,
Among the plurality of base station apparatuses, while communication is being performed in parallel between the first base station apparatus and the second base station apparatus, connection from the second base station apparatus A relay device that is a switching candidate for switching between the relay devices that can relay communication with the base station device, and measurement by the relay device notified from the base station device to which the relay device is connected to the relay device Have the target base station information received
When the second base station apparatus is included in the measurement target base station apparatus, establishment of connection with the relay apparatus is permitted, and the second base station apparatus is included in the measurement target base station apparatus. Control is performed so as not to allow establishment of a connection with the relay device if not
Program for
A computer provided in a terminal apparatus capable of performing wireless communication in parallel with a plurality of base station apparatuses under the control of a first base station apparatus among the plurality of base station apparatuses,
Among the plurality of base station apparatuses, while communication is being performed in parallel between the first base station apparatus and the second base station apparatus, connection from the second base station apparatus Receiving information on the base station apparatus to which the relay apparatus is connected, from the relay apparatus that is a switching candidate for switching and is capable of relaying communication with the base station apparatus;
The relay apparatus is connected to a measurement target base station apparatus notified of from the second base station apparatus to another apparatus relaying communication with the terminal apparatus or the second base station apparatus. Allows the establishment of connection with the relay apparatus when the base station apparatus included is included, and the base station apparatus to be measured does not include the base station apparatus to which the relay apparatus is connected. Control so as not to allow connection establishment with
Program for
A computer provided in a relay apparatus capable of relaying communication between a base station apparatus and a terminal apparatus;
The information of the base station apparatus whose wireless quality is to be measured by the relay apparatus is received from the base station apparatus to which the relay apparatus is connected,
Transmitting information of the base station apparatus to be measured by a broadcast signal;
Program for