WO2019146185A1

WO2019146185A1 - Relay device, terminal device, control method and, program

Info

Publication number: WO2019146185A1
Application number: PCT/JP2018/038817
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: 2018-10-18
Publication date: 2019-08-01
Also published as: JP2019134223A; JP6927895B2

Abstract

A relay device capable of relaying communication in at least part of the interval between a second base station device and a terminal device capable of wirelessly communicating in parallel with a first base station device and the second base station device while under the control of the first base station device, said relay device: receiving a first signal that at least includes information for the notification destination about the wireless quality of the relay by the relay device in the interval between the relay device and the terminal device, when relaying communication in at least part of the interval between the second base station device and the terminal device; acquiring the wireless quality information; determining the transmission destination of the wireless quality information on the basis of at least the wireless quality notification destination information; and transmitting a second signal that includes the wireless quality information to the determined transmission destination.

Description

Relay device, terminal device, control method, and program

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

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. Also, 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 the configuration of Dual Connectivity using the relay apparatus as described above, the base station apparatus manages communication between the terminal apparatus and the base station apparatus based on the success or failure of packet transmission / reception in the upper layer. That is, the base station apparatus can not recognize the deterioration of the radio quality between the terminal apparatus and the relay apparatus while the packet transmission / reception is successful. For this reason, even if the wireless quality between the terminal device and the relay device is degraded, while the packet transmission / reception is successful, the relay device currently connected to the terminal device is connected to another relay device. Can not switch.

The present invention enables an apparatus that manages data transmission and reception between a terminal apparatus and a base station apparatus to appropriately grasp the wireless quality between the relay apparatus and the terminal apparatus.

A relay apparatus according to an aspect of the present invention is a terminal apparatus capable of performing radio communication in parallel with the first base station apparatus and the second base station apparatus under control of the first base station apparatus; A relay apparatus capable of relaying communication of at least a part of a section between two base station apparatuses, the communication of at least a part of a section between the terminal apparatus and the second base station apparatus Receiving means for receiving a first signal including at least information on a report destination of radio quality in the section between the relay apparatus relayed by the relay apparatus and the terminal apparatus when relaying Information on the wireless quality to the determined transmission destination, determination means for determining a transmission destination of the wireless quality information based on at least acquisition information for acquiring quality information, the wireless quality reporting destination information, and Second containing A transmitting means for transmitting a signal, the.

Also, a terminal device according to another aspect of the present invention is a terminal capable of performing radio communication in parallel with the first base station device and the second base station device under the control of the first base station device. An apparatus, wherein when communication with the second base station apparatus is relayed via communication between the terminal apparatus and the relay apparatus, radio quality between the relay apparatus and the terminal apparatus The wireless quality information of at least the receiving means for receiving the first signal including at least the information on the reporting destination, the obtaining means for obtaining the wireless quality information, and the wireless quality reporting destination information It has a determination means which determines a transmission destination, and a transmission means which transmits the 2nd signal containing the information of the said radio | wireless quality to the determined said transmission destination.

According to the present invention, a device that manages data transmission and reception between a terminal device and a base station device can appropriately grasp the wireless quality between the relay device and the terminal device.

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 which shows the hardware structural example of a relay apparatus and a terminal device. It is a block diagram showing an example of functional composition of a relay device and a terminal unit. 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. It is a figure which shows the 3rd example of the flow of the process performed by a radio | wireless communications system. It is a figure which shows the 4th example of the flow of the process performed by a radio | wireless communications system. It is a figure which shows the 5th 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)
FIG. 1 shows an example of the configuration of a wireless communication system according to the present embodiment. The wireless communication system includes, for example, a terminal device 101, a first base station device 102, a second base station device 103, and a relay device 104. The terminal device 101 can perform communication in parallel with the first base station device 102 and the second base station device 103 under the control of the first base station device 102. This parallel communication may be performed according to the definition of Dual Connectivity of 3GPP in one example, but is not limited to this and may be performed in any manner. Note that parallel communication here is sufficient as long as at least two or more connections are established in parallel, and communication may not be performed simultaneously. The terminal device 101 performs control communication for overall communication control with the first base station device 102, and performs data communication with the second base station device 103. For example, the first base station apparatus 102 forms a cell covering a wide area, and the second base station apparatus 103 forms a cell covering a narrow area, and is compared with the first base station apparatus 102. Provide high speed wireless communication. The first base station apparatus 102 is, for example, a base station apparatus of LTE (long term evolution), and the second base station apparatus is, for example, a base station according to a cellular communication standard such as the fifth generation NR (New Radio). It is an apparatus.

Here, the terminal device 101 communicates with the second base station device 103 via the relay device 104. The relay device 104 transfers the signal addressed to the terminal device 101 transmitted from the second base station device 103 to the terminal device 101, and the signal addressed to the second base station device 103 transmitted from the terminal device 101 Transfer to the second base station apparatus 103. The relay apparatus 104 may be a terminal apparatus that communicates with the second base station apparatus 103, or may be a communication apparatus dedicated to relay. Also, although FIG. 1 describes an example in which one relay device 104 exists in the path between the second base station device 103 and the terminal device 101, a plurality of relay devices are present in this path. It may be included. That is, the second base station apparatus 103 is connected to the first relay apparatus, the first relay apparatus is further connected to the second relay apparatus,..., And the N−1th relay apparatus is the Nth A configuration may be used in which the Nth relay apparatus is connected to the relay apparatus and the Nth relay apparatus is connected to the terminal apparatus 101 (where N is a natural number).

The communication path indicating the path of data communication between the second base station apparatus 103 and the terminal apparatus 101 is the same as the first base station apparatus 102 or the second base station apparatus 103, or these apparatuses. It is managed by separate devices (for example, higher-level devices of the first base station device 102 and the second base station device 103). In addition, the path management apparatus which performs such management can be decided by the type of Dual Connectivity. For example, when data to be transmitted from the second base station apparatus 103 to the terminal apparatus 101 is transferred from the first base station apparatus 102 to the second base station apparatus 103, the first base station apparatus 102 It can be a path management device. Also, when data to be transmitted from the second base station apparatus 103 to the terminal apparatus 101 reaches the second base station apparatus 103 without passing through the first base station apparatus 102, the second base station apparatus 103. The host device can be the path management device. The path management device controls, for example, whether to maintain the communication path or change to another communication path, depending on whether or not the communication between the second base station device 103 and the terminal device 101 is successful. can do. However, although the path management apparatus can know the success or failure of packet transmission / reception in the upper layer, it should recognize the deterioration even if the radio quality in the communication section is deteriorated despite the successful packet transmission / reception. I can not In particular, even if the second base station apparatus 103 is a path management apparatus, the path management apparatus can not recognize the wireless quality between the relay apparatus 104 and the terminal apparatus 101. Therefore, establishing and maintaining a communication path with insufficient wireless quality may easily cause disconnection of the communication, and switching of the communication path may occur frequently.

In the present embodiment, in response to such a problem, it is assumed that the path management device can obtain information on the wireless quality for one or more sections (links) between the second base station device 103 and the terminal device 101. The method to do this is explained.

In the present embodiment, the relay device is between the second base station device and a terminal device performing parallel communication with the first base station device and the second base station device under the control of the first base station device. When relaying at least a part of the sections, the path management apparatus is notified of the radio quality for that section. For example, in FIG. 1, in order to relay communication between the terminal device 101 and the second base station device 103, the relay device 104 passes the radio quality for the section between the terminal device 101 and the relay device 104 as a path. Notify the management device. Also, the relay device 104 may notify the path management device of the wireless quality for the section between the second base station device 103 and the relay device 104.

The relay apparatus 104 may measure the radio quality of the relay apparatus in the section to be relayed, or may be measured by another apparatus configuring the section and demodulating the radio signal notified to the relay apparatus. Radio quality information may be obtained from within the radio signal. For example, in the example of FIG. 1, the relay device 104 may acquire the wireless quality for the section between the terminal device 101 and the relay device 104 by measuring the radio wave transmitted by the terminal device 101. The information on the wireless quality of this section measured by the terminal device 101 may be received, or both may be performed. Also, the relay device 104 can acquire the radio quality of the section between the second base station device 103 and the relay device 104 by measuring the radio wave transmitted by the second base station device 103.

In one example, relay apparatus 104 encodes the first radio quality for the section between second base station apparatus 103 and relay apparatus 104 with a predetermined number of bits, and transmits data between terminal apparatus 101 and relay apparatus 104. The second radio quality for the section may be encoded and transmitted with a smaller number of bits than the above-described predetermined number of bits as information indicating the difference from the first radio quality. That is, information indicating how much the second wireless quality deviates from the first wireless quality may be reported. Also, the relationship between the first radio quality and the second radio quality may be reversed, or only information on the difference value of these radio qualities may be reported. For example, when the relay device 104 transmits this report to the second base station device 103, the second base station device 103 measures the radio signal from the relay device 104 to thereby obtain the first radio quality described above. The second radio quality may be obtained from the first radio quality and the reported difference value. Note that these wireless quality notification methods are not limited to the method of transmitting information etc. defining the interrelationship of multiple wireless qualities, and other methods such as a method of transmitting each of multiple wireless qualities with a predetermined number of bits It may be used.

The relay device acquires, for example, from the first base station apparatus or the second base station apparatus, information on a radio quality information report destination for notification of the radio quality. The information of the report destination may be information related to a path management apparatus that manages the communication path between the terminal apparatus and the second base station apparatus, or the partner apparatus with which the relay apparatus directly transmits wireless quality information by radio. May be information identifying the For example, the information of the report destination can designate a path management device such as the first base station device, the second base station device, or the upper layer device. Also, the information of the report destination is the information of the other party apparatus that directly transmits the information of the radio quality, the communication between the first base station apparatus, the second base station apparatus, the terminal apparatus and the second base station apparatus The device on the second base station device side can be designated by one hop from the relay device in the path. Note that the information of the report destination is included, for example, in the first signal transmitted by the first base station apparatus, the second base station apparatus, or another apparatus capable of relaying communication with these base stations. sell.

When the relay device receives the first signal, the relay device acquires the report destination information included in the first signal, and determines the transmission destination of the wireless quality information based on the information. For example, when the information on the report destination indicates the information on the partner apparatus that directly transmits the information on the radio quality, the relay apparatus determines the partner apparatus as the transmission destination. In addition, when the relay apparatus includes information for specifying a path management apparatus, the relay apparatus specifies a path for transmitting radio quality information to the path management apparatus, and transmits an apparatus that the relay apparatus should communicate on the path. It can be decided as the first. In the example of FIG. 1, when the path management apparatus is the first base station apparatus 102, the relay apparatus 104 determines the first base station apparatus 102 as the transmission destination, and directly to the first base station apparatus 102. , And may decide to transmit radio quality information. Further, when the direct communication path to the first base station apparatus 102 is not established, the relay apparatus 104 determines the second base station apparatus 103 or the terminal apparatus 101 as a transmission destination, and The information may be transferred to the first base station apparatus 102. Also, when the path management apparatus is the upper level apparatus or the second base station apparatus 103, the relay apparatus 104 can determine the second base station apparatus 103 as a transmission destination. In addition to the information of the report destination of the notified wireless quality information, relay apparatus 104 may, for example, further information such as wireless quality between first base station apparatus 102 and second base station apparatus 103. The destination may be determined based on For example, when the higher-level device is the report destination of the information on the radio quality, the relay device 104 determines that the radio quality with the first base station device 102 is the radio quality with the second base station device 103. If it is higher than the predetermined level, the first base station apparatus 102 may be determined as the transmission destination. Also, when the higher-level device is the report destination of the wireless quality information, for example, the relay device 104 performs the first operation also when the number of hops in the communication path to the second base station device 103 is equal to or greater than a predetermined number The base station apparatus 102 may be determined as the transmission destination. Further, when the number of hops in the communication path to the second base station apparatus 103 is equal to or more than a predetermined number, the relay apparatus 104 may set the transmission destination to the second base station apparatus 103. That is, when the number of hops in the communication path is equal to or greater than the predetermined number, relay apparatus 104 may determine to transmit the wireless quality information directly to second base station apparatus 103 without using the communication path. .

The first signal may further include an indication indicating that radio quality should be reported (for example, after a predetermined frame) or information on conditions under which radio quality should be reported. For example, when the first signal includes an instruction indicating that radio quality should be reported, the relay apparatus measures the radio quality measured for the section relayed by the own apparatus or the other apparatus for the section and the relay apparatus Generating a second signal including the information of the wireless quality notified to (for example, after a predetermined frame of the frame in which the first signal is received). In addition, when the first signal includes the information on the condition under which the radio quality should be reported, the relay apparatus includes the second information on the acquired radio quality in response to the satisfaction of the condition. Signals can be transmitted. Here, the condition includes that the acquired wireless quality is equal to or less than a predetermined level. For example, in FIG. 1, the relay device 104 monitors the wireless quality with the terminal device 101 or the second base station device 103, and in response to the wireless quality becoming equal to or less than a predetermined level, the wireless quality Report on Also, the condition may be, for example, a condition related to the timing of making a report. That is, the relay apparatus can report the radio quality at a predetermined timing designated as the condition. The conditions may include further other conditions. By using such conditions, it is possible to prevent radio resources from being wasted because radio quality is not reported unless the conditions are satisfied.

Also, the first signal may further include information indicating which section of radio quality should be reported. For example, whether to report the first radio quality for the section on the second base station apparatus side from the relay apparatus, or to report the second radio quality for the section on the terminal apparatus side, the first radio quality Information indicating whether both the second radio quality and the second radio quality should be reported may be included in the first signal. According to this, since the information of the wireless quality for the section designated on the network side is notified to the path management apparatus, the path management apparatus considers the state of the wireless quality for each section, and the second base station The communication path from the device 103 to the terminal device 101 can be determined.

In addition, when the communication path between the second base station apparatus 103 and the terminal apparatus 101 is formed in a multihop configuration of three or more hops, in particular, in the relay apparatus, in which section the wireless quality to be reported is The identification information for indicating may be transmitted by being included in the above-mentioned second signal. The identification information may be, for example, identification information of the relay apparatus, identification information of another apparatus forming the section with the relay apparatus, or the number of hops of the section from the second base station apparatus. For example, in the example of FIG. 1, for the section between the relay apparatus 104 and the terminal apparatus 101, identification information of the relay apparatus 104 and the terminal apparatus 101, and the number of hops from the second base station apparatus 103, "2". Etc. may be used as identification information of the section.

Although the above-described method has been described by way of an example in which the relay device reports information on wireless quality, the terminal device may execute the same process. That is, the terminal device receives the first signal including the information of the report destination of the information of the wireless quality, acquires the wireless quality in the section with the relay device in which the own device directly performs wireless communication, and The transmission destination of the second signal including the wireless quality information may be determined based on the information of the report destination, and the second signal may be transmitted to the determined transmission destination.

(Device configuration)
Subsequently, a hardware configuration example and a functional configuration example of the relay device according to the present embodiment will be described. Note that, as described above, the terminal device can report information on wireless quality in the same manner as the relay device, and thus can have the same configuration as the relay device.

FIG. 2 shows an example of the hardware configuration of the relay device and the terminal device. The relay device and the terminal device have, in one example, a hardware configuration as illustrated in FIG. 2 and, for example, have a CPU 201, a ROM 202, a RAM 203, an external storage device 204, and a communication device 205. In the relay device and the terminal device, for example, a program for realizing the functions of the relay device and the terminal 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.

The relay device and the terminal device control the communication device 205 by the CPU 201, for example, to communicate with other devices. For example, the communication device 205 of the relay device can perform wireless communication with a base station device, a terminal device, or another relay device based on a communication standard such as the fourth generation LTE or the fifth generation NR. In addition, the communication device 205 of the terminal device is configured to perform at least a part of the communication between the first base station device and the second base station device (or the second base station device and the terminal device) according to the procedure of Dual Connectivity. Parallel communication with a relay device that relays a section can be performed. In addition, in the structure of FIG. 2, although the relay apparatus and the terminal device show the schematic as it has one communication apparatus 205, it is not restricted to this. For example, the relay apparatus performs first communication between the apparatus on the base station apparatus side in the communication path between the terminal apparatus and the base station apparatus, and second communication on the terminal apparatus side apparatus in the communication path. And two communication devices may be provided. Also, the terminal device may have two communication devices in order to establish multiple connections.

The relay device and the terminal device may be provided with dedicated hardware for executing each function, or may be partially executed by hardware and may be executed by the computer for operating the program. Also, all functions may be performed by a computer and a program.

FIG. 3 shows an example of the functional configuration of the relay device and the terminal device according to this embodiment. The relay apparatus and the terminal apparatus include, in one example, a communication unit 301, a report information acquisition unit 302, a wireless quality acquisition unit 303, a transmission destination determination unit 304, and a wireless quality report unit 305. Although the relay device and the terminal device have functions other than that shown in FIG. 3 that a normal relay device and terminal device have, these functions are omitted here for the sake of simplicity. .

The communication unit 301 is a functional unit for performing wireless communication in accordance with the standards such as LTE and NR, for example. The communication unit 301 performs encoding, modulation, frequency conversion, etc. of transmission target data, forms a radio signal and transmits it, and receives a radio signal, and performs frequency conversion, demodulation, and data decoding of the radio signal. And at least the function of Also, the communication unit 301 can establish at least two wireless communication links in parallel. For example, the communication unit 301 of the terminal apparatus establishes a wireless communication link with each of the first base station apparatus and the second base station apparatus (relay apparatus that relays communication with the second base station apparatus). Parallel communication. In addition, the communication unit 301 of the relay apparatus is configured to communicate with the second base station apparatus (second base station apparatus or another relay apparatus) in the communication path between the second base station apparatus and the terminal apparatus. The first communication and the second communication with an apparatus (terminal apparatus or other relay apparatus) on the terminal apparatus side in the communication path can be performed in parallel.

From the first signal received by the communication unit 301 from the path management apparatus (for example, the first base station apparatus, the second base station apparatus, or the upper apparatus), the report information acquisition unit 302 reports the radio quality report destination. Get information. The information of the radio quality report destination may be, in one example, information of a path management apparatus or information of a partner apparatus that directly transmits information of the radio quality. Also, the information of the path management device may be indicated by the information of the dual connectivity type. When the first signal includes an instruction indicating that radio quality should be reported (for example, after a predetermined frame) or information on conditions under which the radio quality should be reported. Get this instruction or information. When the instruction or the information is included in the first signal, the report information acquisition unit 302 transfers the instruction or the information to the wireless quality report unit 305. Furthermore, when the first signal includes information on which radio quality should be reported for the communication section, the report information acquisition section 302 acquires the information and sends the information to the radio quality acquisition section 303. Forward.

The wireless quality acquisition unit 303 acquires the wireless quality of the wireless link established by the own apparatus regarding the communication path between the second base station apparatus and the terminal apparatus. For example, the wireless quality acquisition unit 303 of the terminal apparatus measures the wireless quality between the relay apparatus directly connected to the terminal apparatus, thereby obtaining the wireless quality of the wireless link between the terminal apparatus and the relay apparatus. Get information. Note that the wireless quality acquisition unit 303 of the terminal device receives the information on the wireless quality measured by the relay device directly connected to the terminal device, for example, from the relay device via the communication unit 301, Information on the radio quality of the radio link with the relay device may be obtained. Also, the wireless quality acquisition unit 303 of the relay device is a device closer to the terminal device than the own device in the communication path, and the first wireless quality for the wireless link between the relay device and the device directly connected get. Also, the wireless quality acquisition unit 303 of the relay device is a device on the second base station device side with respect to the own device in the communication path, and the second wireless link between the relay device and the device directly connected Can also acquire the wireless quality of The wireless quality acquisition unit 303 of the intermediate device can acquire these wireless qualities by the measurement by the own device or by receiving the measurement result by another device, as in the case of the above-described terminal device. Note that, when the information of the communication section in which the radio quality should be reported is transferred from the report information acquisition unit 302, the radio quality acquisition unit 303 of the relay apparatus performs the first radio quality and the second radio quality according to the information. The radio quality of either or both of the radio quality of may be acquired. If the information on the communication section in which the radio quality should be reported is not transferred, the radio quality for the section set in advance is acquired.

The transmission destination determination unit 304 is a transmission destination of the second signal including the information of the wireless quality acquired by the wireless quality acquisition unit 303 based at least on the information of the report destination of the wireless quality acquired by the report information acquisition unit 302. Determine the device. When the information on the report destination indicates the information on the partner apparatus that directly transmits the information on the wireless quality, the transmission destination determining unit 304 determines the partner apparatus as the transmission destination. In addition, when the information for specifying the path management apparatus is included, the transmission destination determination unit 304 specifies the path for transmitting the wireless quality information to the path management apparatus, and the relay apparatus should communicate on the path. The device may be determined as the destination. In addition to the information on the reporting destination of the notified wireless quality information, the transmission destination determining unit 304 performs transmission based on, for example, additional information such as the wireless quality and the number of hops in the communication path to the reporting destination apparatus. You may decide ahead.

The wireless quality report unit 305 transmits the second signal including the wireless quality information acquired by the wireless quality acquisition unit 303 to the device of the transmission destination determined by the transmission destination determination unit 304 via the communication unit 301. Do. Note that, for example, the wireless quality reporting unit 305 transmits the second signal after the reception of the first signal according to the instruction transferred from the report information acquisition unit 302 and indicating that the wireless quality should be reported. Thus, the communication unit 301 can be controlled. Also, for example, the wireless quality reporting unit 305 determines whether the condition is satisfied or not according to the condition to report the wireless quality transferred from the report information acquisition unit 302, and the condition is satisfied. The communication unit 301 can be controlled to transmit the second signal. In one example, the wireless quality reporting unit 305 transmits the second signal when the value of the wireless quality acquired by the wireless quality acquisition unit 303 becomes equal to or lower than a predetermined level, or when a condition such as designated timing is satisfied. Are controlled so that the communication unit 301 is transmitted. When the wireless quality report unit 305 does not obtain the above instruction or condition from the report information acquisition unit 302, the second signal is transmitted according to a predetermined timing or condition set in advance. The communication unit 301 is controlled. Also, the radio quality reporting unit 305 may include in the second signal identification information indicating which communication section the radio quality to be reported relates to. The identification information may be, for example, identification information of the relay apparatus, identification information of another apparatus forming the section with the relay apparatus, or the number of hops of the section from the second base station apparatus.

(Flow of processing)
Subsequently, the flow of processing performed in the wireless communication system having the relay apparatus or the terminal apparatus as described above will be described using several examples. In the following example, the case where a system as shown in FIG. 1 is used will be described.

Processing Example 1
FIG. 4 shows a first example of the flow of processing according to the present embodiment. In this example, the first base station apparatus 102 is a path management apparatus, and transmission data to the terminal apparatus 101 other than control communication is transferred from the first base station apparatus 102 to the second base station apparatus 103, After that, the second base station apparatus 103 transmits to the terminal apparatus 101 via the relay apparatus 104. In this example, the first base station apparatus 102 transmits, to the relay apparatus 104, a first signal including at least information on a radio quality report destination (S401). In this case, the radio quality report destination is the first base station apparatus 102 which is a path management apparatus. The first signal may be transmitted directly from the first base station apparatus 102 to the relay apparatus 104, but may be transmitted to the relay apparatus 104 via the second base station apparatus 103. Good. Then, for example, while relaying data communication between the second base station apparatus 103 and the terminal apparatus 101 (S402), the relay apparatus 104 performs wireless quality on the wireless link between the terminal apparatus 101 and the own apparatus. It measures (S403). The measurement of the wireless quality may be performed in the terminal device 101, and the measurement result may be notified to the relay device 104. At this time, relay apparatus 104 may also measure the wireless quality between second base station apparatus 103 and its own apparatus. After that, the relay device 104 reports the wireless quality acquired in S401, for example, the second signal including the wireless quality information in response to satisfying the predetermined timing or the condition designated by the first signal. It transmits to the 1st base station apparatus 102 based on the above information (S404). Note that the second signal including the information on the wireless quality may be directly transmitted from the relay apparatus 104 to the first base station apparatus 102, but for example, the second base station apparatus 103 (in some cases, May be transmitted to the first base station apparatus 103 via the terminal device 101). That is, relay apparatus 104 determines, for example, whether a wireless link is established between itself and first base station apparatus 102, and determines the transmission destination of the second signal according to the determination result. May be

By doing this, the wireless link between the terminal device 101 and the relay device 104 (and in some cases, the second base station device 103 and the relay device 104 to the first base station device 102 which is the path management device) is performed. The radio quality of the radio link between Therefore, the first base station apparatus 102 (path management apparatus) appropriately sets the communication path to the terminal apparatus 101 based on the reported wireless quality, and switching of the communication path occurs frequently. It can prevent.

Processing Example 2
FIG. 5 shows a second example of the flow of processing according to the present embodiment. In this example, an example in which the second base station apparatus 103 or the higher-level apparatus is a path management apparatus is shown, and transmission data other than control communication does not pass through the first base station apparatus 102 and the terminal apparatus 101 does not. Sent to. In addition, about the process step similar to FIG. 4, the same referential mark is attached | subjected and description is abbreviate | omitted. In this process example, the second base station apparatus 103 transmits, to the relay apparatus 104, a first signal including at least information on a radio quality report destination (S501). If the path management apparatus is the upper apparatus, the upper apparatus may notify the second base station apparatus 103 of the information on the radio quality report destination before the transmission of the first signal in S501. (S502). Here, when the second base station apparatus 103 recognizes in advance that the host apparatus is the path management apparatus, or when the path management apparatus is the second base station apparatus 103, the process of S502 is omitted. Be done. Thereafter, the relay device 104 acquires wireless quality information on the wireless link established by the relay device 104, and notifies the second base station device 103 of the information (S503). When the upper apparatus is the path management apparatus, this information is transferred from the second base station apparatus 103 to the upper apparatus (S504). In this manner, when the second base station apparatus 103 or the higher-level apparatus is a path management apparatus, information on radio quality can be transmitted from the relay apparatus 104 to the path management apparatus.

For example, when the first base station apparatus 102 performs control communication for the relay apparatus 104 and the upper apparatus is a path management apparatus, the wireless quality from the upper apparatus to the first base station apparatus 102 The information of the report destination can be notified, and the information can be notified from the first base station apparatus 102 to the relay apparatus 104. In this case, the wireless quality information may also be notified from the relay apparatus 104 to the first base station apparatus 102, and may be notified from the first base station apparatus 102 to the higher-order apparatus. Information on radio quality may be transmitted to the second base station apparatus 103 instead of the base station apparatus 102, and the information may be transferred from the second base station apparatus 103 to the higher-level apparatus.

Also, for example, when the first base station apparatus 102 performs control communication for the relay apparatus 104 and the second base station apparatus 103 is a path management apparatus, the second base station apparatus 103 The first base station apparatus 102 can be notified of the information on the radio quality report destination, and the first base station apparatus 102 can notify the relay apparatus 104 of the information. In this case, the relay apparatus 104 may transmit the information on the wireless quality to the second base station apparatus 103, or the information on the wireless quality may be notified from the relay apparatus 104 to the first base station apparatus 102, After that, the first base station apparatus 102 may notify the second base station apparatus 103.

According to the processing as described above, the wireless link between the terminal device 101 and the relay device 104 (in some cases, the second base station device to the second base station device 103 or higher-level device which is a path management device) The radio quality of the radio link between 103 and the relay device 104 is notified. Therefore, the path management apparatus can appropriately set the communication path to the terminal device 101 based on the reported wireless quality, and can prevent the switching of the communication path from occurring frequently.

Processing Example 3
FIG. 6 shows a third example of the flow of processing according to the present embodiment. The present example is different from the processing example 1 in that the terminal device 101, not the relay device 104, reports the wireless quality. It should be noted that although the terminal device 101 can directly communicate with the first base station device 102, it may not be able to communicate directly with the second base station device 103.

In this example, the first base station apparatus 102 transmits, to the terminal apparatus 101, a first signal including at least information on a radio quality report destination (S601). In this case, the radio quality report destination is the first base station apparatus 102 which is a path management apparatus. Then, for example, while performing data communication with the relay device 104 that relays communication with the second base station device 103 (S602), the terminal device 101 performs communication between itself and the relay device 104. The wireless quality is measured for the wireless link (S603). After that, the terminal device 101 reports the wireless quality acquired in S601, for example, the second signal including the wireless quality information in response to satisfying the predetermined timing or the condition designated by the first signal. It transmits to the 1st base station apparatus 102 based on the above information (S604). Although the second signal including the information of the wireless quality may be directly transmitted from the terminal device 101 to the first base station device 102, for example, the relay device 104 and the second base station device It may be transmitted to the first base station apparatus 103 via 103.

Thereby, the radio quality of the radio link between the terminal device 101 and the relay device 104 is notified to the first base station device 102 which is the path management device. Then, the first base station apparatus 102 (path management apparatus) appropriately sets the communication path to the terminal apparatus 101 based on the reported wireless quality, and prevents frequent switching of the communication path. be able to.

Processing Example 4
FIG. 7 shows a fourth example of the flow of processing according to the present embodiment. In this example, an example in which the second base station apparatus 103 or the higher-level apparatus is a path management apparatus is shown, and transmission data other than control communication does not pass through the first base station apparatus 102 and the terminal apparatus 101 does not. Sent to. In addition, about the process step similar to FIG. 6, the same referential mark is attached | subjected and description is abbreviate | omitted. In this process, the terminal device 101 designates the second base station device 103 or the higher-level device in the information of the radio quality report destination in S601. The first base station apparatus 102 can obtain the information on the radio quality report destination from the higher-level apparatus (S701). Also, when the second base station apparatus 103 is a path management apparatus, the first base station apparatus 102 acquires the information on the radio quality report destination from the second base station apparatus 103. It is also good. In this example, the first base station apparatus 102 transmits the first signal including the information of the radio quality report destination, but the second base station apparatus 103 transmits, for example, the first signal. It may be transmitted to the terminal device 101 via the device 104.

The terminal device 101 transmits a second signal including information on wireless quality to the second base station device 103 via the relay device 104 (S701). When the upper apparatus is the path management apparatus, this information is transferred from the second base station apparatus 103 to the upper apparatus (S702). In this way, when the second base station apparatus 103 or the higher-level apparatus is a path management apparatus, information on wireless quality can be transmitted from the terminal apparatus 101 to the path management apparatus.

When the terminal device 101 reports the information on the radio quality to the second base station device 103 or the higher-level device, the terminal device 101 may pass through the first base station device 102. The flow of processing in that case is shown in FIG. When the first base station apparatus 102 receives the second signal from the terminal apparatus 101, the first base station apparatus 102 transfers the second signal to the path management apparatus (the second base station apparatus 103 or the higher-level apparatus) (S801, S802). ). Such processing may be performed, for example, when the wireless quality of the wireless link between the terminal device 101 and the relay device 104 is at a low level, or in the communication path between the terminal device 101 and the second base station device 103. It can be executed when the number of hops is equal to or greater than a predetermined number. As a result, the terminal device 101 can reliably report information on wireless quality to the path management device according to the situation. Then, the path management device can appropriately set the communication path to the terminal device 101 based on the reported wireless quality, and can prevent the switching of the communication path from occurring frequently.

As described above, it becomes possible for the path management device that manages data transmission and reception between the terminal device and the base station device to properly grasp the wireless quality between the relay device and the terminal device.

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. 2018-012499 filed on Jan. 29, 2018, the entire contents of which are incorporated herein by reference.

Claims

At least between a terminal apparatus capable of performing radio communication in parallel with the first base station apparatus and the second base station apparatus under control of the first base station apparatus and the second base station apparatus A relay device capable of relaying communication in a part of sections,
When relaying communication of at least a part of a section between the terminal apparatus and the second base station apparatus, wireless quality in the section between the relay apparatus and the terminal apparatus relayed by the relay apparatus Receiving means for receiving a first signal including at least information on a report destination of
Acquisition means for acquiring the wireless quality information;
A determination unit that determines a transmission destination of the wireless quality information based at least on the wireless quality report destination information;
Transmitting means for transmitting a second signal including the information on the wireless quality to the determined destination;
The relay apparatus characterized by having.
The information on the radio quality report destination is information on a device that manages a communication path between the terminal device and the second base station device.
The relay apparatus according to claim 1, characterized in that:
The first signal further includes an instruction indicating that the wireless quality information should be reported, or a condition under which the wireless quality information should be reported.
The relay apparatus according to claim 1 or 2, characterized in that:
The condition includes that the wireless quality is equal to or less than a predetermined level,
The relay apparatus according to claim 3, characterized in that:
The first signal should report a first radio quality on the section on the side of the second base station apparatus as viewed from the relay apparatus, or on the section on the side of the terminal apparatus as viewed from the relay apparatus. Further including information indicating whether to report two radio qualities or whether to report both the first radio quality and the second radio quality
The relay device according to any one of claims 1 to 4, characterized in that:
The second signal further includes information identifying the section relayed by the relay apparatus, or information identifying the relay apparatus or information identifying an apparatus communicating with the relay apparatus in the section.
The relay device according to any one of claims 1 to 5, characterized in that:
A terminal device capable of performing radio communication in parallel with the first base station device and the second base station device under the control of the first base station device,
When communication with the second base station apparatus is relayed through communication between the terminal apparatus and the relay apparatus, information on a report destination of radio quality between the relay apparatus and the terminal apparatus Receiving means for receiving at least a first signal, including:
Acquisition means for acquiring the wireless quality information;
A determination unit that determines a transmission destination of the wireless quality information based at least on the wireless quality report destination information;
Transmitting means for transmitting a second signal including the information on the wireless quality to the determined destination;
A terminal device characterized by having.
The information on the radio quality report destination is information on an apparatus that manages a communication path between the second base station apparatus and the terminal apparatus.
The terminal device according to claim 7, characterized in that:
The first signal includes an indication indicating that the wireless quality information should be reported, or a condition under which the wireless quality information should be reported.
The terminal device according to claim 7 or 8, characterized in that:
The condition includes that the wireless quality is equal to or less than a predetermined level,
The terminal device according to claim 9, characterized in that:
The second signal further includes information identifying the terminal device.
The terminal device according to any one of claims 7 to 9, characterized in that:
At least between a terminal apparatus capable of performing radio communication in parallel with the first base station apparatus and the second base station apparatus under control of the first base station apparatus and the second base station apparatus A control method of a relay apparatus capable of relaying communication in a part of sections, comprising:
When the receiving unit relays communication of at least a part of a section between the terminal device and the second base station device, the relay unit relays the communication between the relay device and the terminal device. Receiving a first signal containing at least information on where to report the radio quality in the section;
An acquiring step of acquiring information on the wireless quality;
A determining step of determining a transmission destination of the wireless quality information based at least on the wireless quality reporting destination information;
A transmitting step of transmitting, to the determined transmission destination, a second signal including information on the wireless quality;
A control method characterized by comprising:
A control method of a terminal device capable of performing radio communication in parallel with the first base station device and the second base station device under the control of the first base station device,
When the receiving means relays communication between the second base station apparatus via the communication between the terminal apparatus and the relay apparatus, reporting of the wireless quality between the relay apparatus and the terminal apparatus Receiving a first signal containing at least information on the preceding;
An acquiring step of acquiring information on the wireless quality;
A determining step of determining a transmission destination of the wireless quality information based at least on the wireless quality reporting destination information;
A transmitting step of transmitting, to the determined transmission destination, a second signal including information on the wireless quality;
A control method characterized by comprising:
At least between a terminal apparatus capable of performing radio communication in parallel with the first base station apparatus and the second base station apparatus under control of the first base station apparatus and the second base station apparatus In a computer provided in a relay device capable of relaying communication in a part of sections,
When relaying communication of at least a part of a section between the terminal apparatus and the second base station apparatus, wireless quality in the section between the relay apparatus and the terminal apparatus relayed by the relay apparatus Receive a first signal containing at least information on where to report
Get information on the wireless quality,
The transmission destination of the wireless quality information is determined based at least on the wireless quality report destination information,
Causing the determined destination to transmit a second signal including the wireless quality information;
Program for
A computer provided in a terminal device capable of performing radio communication in parallel with the first base station device and the second base station device under control of the first base station device,
When communication with the second base station apparatus is relayed through communication between the terminal apparatus and the relay apparatus, information on a report destination of radio quality between the relay apparatus and the terminal apparatus To receive the first signal including at least
Have the wireless quality information acquired
The transmission destination of the wireless quality information is determined based at least on the wireless quality report destination information,
Causing the determined destination to transmit a second signal including the wireless quality information;
Program for