JP2016213529A - User device, relay device, and communication control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that can appropriately keep track of overall communication quality between a base station and a user device when a radio signal from the base station is relayed.SOLUTION: A user device for communicating with a relay device that relays a signal from/to a base station includes: measuring means for measuring the reception quality of a radio signal transmitted by the relay device; reception means for receiving reference information indicating the reception quality of a radio signal between the base station and the relay device from the relay device; and control means for performing prescribed control on the basis of the reception quality measured by the measuring means and the reference information.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a user apparatus, a relay apparatus, and a communication control method.

  In LTE (Long Term Evolution), a relay technology for relaying wireless transmission between a base station and a user apparatus is introduced for the purpose of coverage expansion. By using relay technology, it is expected to efficiently expand coverage in places where it is difficult to secure wired backhaul lines.

  In 3GPP (3rd Generation Partnership Project) Release 10, layer 3 relay technology is introduced (see, for example, Non-Patent Document 1). In addition to demodulating / decoding the downlink received RF signal from the base station, the layer 3 relay technology performs processing for reproducing user data and transmitting user data wirelessly again. It is a relay technology that transmits to a device.

  FIG. 1 is a diagram for explaining the layer 3 relay technology. The relay apparatus shown in FIG. 1 relays the radio signal received from the base station to the user apparatus b. The interface between the base station and the relay device is called Un, and the interface between the user device a and the base station or between the user device b and the relay device is called Uu. In FIG. 3, the base station performs scheduling of communication performed between the user apparatus a and the relay apparatus, and the relay apparatus performs scheduling of communication performed between the user apparatus b and the user apparatus b.

  Next, in LTE, communication between user apparatuses via a base station or the like is generally performed by communication between a user apparatus and a base station, but in recent years, communication is performed directly between user apparatuses. Various techniques for D2D (Device to Device) communication have been proposed (see, for example, Non-Patent Document 2).

  In D2D communication in LTE, a “communication” service for performing data communication such as VoIP (Voice over Internet Protocol) calls between user apparatuses, and a discovery message (discovery message) including the ID of the user apparatus. There has been proposed a “Discovery” service that causes a receiving-side user device to detect a transmitting-side user device by transmitting (see Non-Patent Document 1). The communication service is assumed to be applied to, for example, public safety (police, fire fighting radio, etc.).

  In D2D communication defined by LTE, each user apparatus has been proposed to use a part of the uplink resources that are already defined as resources for uplink signal transmission from the user apparatus to the base station. In addition, it has been proposed that the base station assists in allocating resources used in D2D communication.

  Furthermore, in D2D communication in LTE, a technique called D2D relay that realizes expansion of coverage by the user apparatus serving as a relay apparatus has been studied.

  FIG. 2 is a diagram for explaining the D2D relay technology. As illustrated in FIG. 2, the user apparatus “a” that has received the signal from the base station transfers the signal to the user apparatus “b”. Further, the user device c receiving the signal from the user device b transfers the signal to the user device d. Thus, each user apparatus plays the role of a relay apparatus, so that the base station can transmit signals to the user apparatus b and the user apparatus c located outside the coverage of the base station.

3GPP TS36.300 V12.5.0 (2015-03) 3GPP TR36.843 V12.0.1 (2014-03)

  Here, when the above-described layer 3 relay technology or D2D relay technology is applied, a conventional user device is a relay device based on the layer 3 relay technology, or a user device serving as a relay device in the D2D relay technology. Predetermined control is performed based on the reception quality of the received DL signal.

  As an example of the predetermined control, a conventional user apparatus performs control to change an antenna pictogram display based on reception quality of a DL (Downlink) signal of a cell (carrier) received by the user apparatus itself. The DL signal reception quality is, for example, RSRQ (Reference Signal Received Quality) or RSRP (Reference Signal Received Power). By displaying the antenna picture on the user device, the user can roughly grasp the throughput and the wireless status at the current location. In addition, the telecommunications carrier can appeal to the user about the evolution of the network and the wide coverage.

  FIG. 3 is a diagram illustrating the relationship between the antenna picture display and the reception quality of the DL signal. In general, as the distance from the base station increases, the reception quality of the DL signal deteriorates. Therefore, as shown in FIG. 3, the antenna picture displayed on the user apparatus changes as the distance from the base station increases. In addition, in the user equipment d located outside the coverage of the base station, “out of service area” is displayed in the antenna picture.

  That is, when the above-described layer 3 relay technology or D2D relay technology is applied, a conventional user device receives from a relay device based on the layer 3 relay technology or a user device that plays the role of a relay device based on the D2D relay technology. The antenna pictogram display is performed based on the received quality of the DL signal. On the other hand, in the layer 3 relay technology or the D2D relay technology, the communication status between the base station and the relay device (or the user device that plays the role of the relay device) may become a bottleneck. Therefore, the antenna pict displayed on the user apparatus may not always show the correct throughput.

  FIG. 4 is a diagram (part 1) for describing a problem in antenna pictogram display. FIG. 4 shows a mobile communication network in which layer 3 relay technology is used. For example, when the radio quality between the base station and the relay device a is good and the radio quality between the relay device a and the user device a is also good, between the base station and the user device a High throughput will be realized. In this case, the antenna pictogram display of the user apparatus a is displayed based on the reception quality of the DL signal received from the relay apparatus, but high throughput is realized in the entire section between the base station and the user apparatus a. Therefore, no particular problem occurs.

  On the other hand, when the radio quality between the base station and the relay apparatus b is poor and the radio quality between the relay apparatus b and the user apparatus b is good, there is no difference between the base station and the relay apparatus b. It becomes a bottleneck and high throughput cannot be expected between the base station and the user apparatus b. However, the antenna picture display of the user apparatus b is displayed based on the reception quality of the DL signal received from the relay apparatus b. That is, although the actual throughput is low, the antenna picture of the user apparatus is displayed so that the reception quality is good.

  FIG. 5 is a diagram (part 2) for explaining a problem in antenna pictogram display. FIG. 5 shows a mobile communication network in which D2D relay technology is used. For example, the radio quality between the base station and the user device a, and between the user device b and the user device c is poor, between the user device a and the user device b, and between the user device c and the user device d. Assume that the wireless quality during the period is good.

  In this case, the antenna picture of the user apparatus d is displayed based on the reception quality of the DL signal from the user apparatus c. Therefore, the antenna picture of the user apparatus d is displayed so that the reception quality is good. However, actually, since the radio quality between the base station and the user apparatus a and between the user apparatus b and the user apparatus c is poor, the entire section between the base station and the user apparatus d The actual throughput at is low. That is, although the actual throughput is low, the antenna picture of the user apparatus d is displayed so that the reception quality is good.

  The disclosed technology has been made in view of the above, and a technology that makes it possible to appropriately grasp the overall communication quality with a base station when a radio signal from the base station is relayed. The purpose is to provide.

  The user apparatus of the disclosed technology is a user apparatus that communicates with a relay apparatus that relays a signal of a base station, and a measurement unit that measures reception quality of a radio signal transmitted from the relay apparatus, and the relay apparatus, A receiving unit that receives reference information indicating reception quality of a radio signal between the base station and the relay device, and a control that performs predetermined control based on the reception quality measured by the measuring unit and the reference information Means.

  The relay device according to the disclosed technique is a relay device that relays a signal of a base station to a user device, and the first radio signal transmitted from the base station or another relay device different from the relay device. Measuring means for measuring reception quality; and transmission means for generating first reference information based on the reception quality of the first radio signal and transmitting the generated first reference information to the user apparatus. .

  The communication control method of the disclosed technology is a communication control method executed by a mobile communication system having a relay device that relays a signal of a base station to a user device and a user device that communicates with the relay device, A measurement step in which the relay device measures reception quality of the first radio signal transmitted from the base station or another relay device different from the relay device; and the relay device receives the first radio signal. A transmission step of generating reference information based on quality, transmitting the generated reference information to the user device, and a measuring step of measuring the reception quality of the second radio signal transmitted from the relay device by the user device A receiving step in which the user device receives reference information from the relay device; and a received product of the second radio signal measured by the user device in the measuring step. And a control step of performing predetermined control on the basis of said reference information.

  According to the disclosed technique, a technique is provided that makes it possible to appropriately grasp the overall communication quality with the base station when a radio signal from the base station is relayed.

It is a figure for demonstrating a layer 3 relay technique. It is a figure for demonstrating D2D relay technique. It is a figure which shows the relationship between an antenna pictogram display and the reception quality of DL signal. It is FIG. (1) for demonstrating the subject in an antenna pictogram display. It is FIG. (2) for demonstrating the subject in an antenna pictogram display. It is a figure which shows an example of a structure of the mobile communication system which concerns on embodiment. It is a figure which shows an example of a function structure of the user apparatus which concerns on 1st embodiment. It is a figure which shows an example of a function structure of the relay apparatus which concerns on 1st embodiment. It is a sequence diagram which shows an example of the process sequence (the 1) which the mobile communication system which concerns on 1st embodiment performs. It is a flowchart which shows an example of the process sequence in case a user apparatus performs an antenna picture display. It is a sequence diagram which shows an example of the process sequence (the 2) which the mobile communication system which concerns on 1st embodiment performs. It is a figure which shows an example of a function structure of the user apparatus which concerns on 2nd embodiment. It is a figure which shows an example of a function structure of the relay apparatus which concerns on 2nd embodiment. It is a figure which shows an example of a function structure of the base station which concerns on 2nd embodiment. It is a sequence diagram which shows an example of the process sequence (the 1) which the mobile communication system which concerns on 2nd embodiment performs. It is a sequence diagram which shows an example of the process sequence (the 2) which the mobile communication system which concerns on 2nd embodiment performs. It is a sequence diagram which shows an example of the process sequence (the 3) which the mobile communication system which concerns on 2nd embodiment performs.

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment described below is only an example, and the embodiment to which the present invention is applied is not limited to the following embodiment. For example, although the mobile communication system according to the present embodiment supports LTE, the present invention is not limited to LTE and can be applied to other systems. In addition, in this specification and claims, “LTE” corresponds to not only a communication method corresponding to Release 8 or 9 of 3GPP but also Release 10, 11, 12, 13, or Release 14 or later of 3GPP. It is used in a broad sense that includes communication methods.

<Overview>
FIG. 6 is a diagram illustrating an example of a configuration of the mobile communication system according to the embodiment. As illustrated in FIG. 6, the mobile communication system according to the present embodiment includes a user device 1, a relay device 2, and a base station 3. In FIG. 6, one relay device 2 is shown, but this is an example, and a plurality of relay devices 2 may be included between the user device 1 and the base station 3. That is, in the example of FIG. 6, the signal from the base station 3 is relayed once by one relay device 2, but the present invention is not limited to this, and the signal from the base station 3 is transmitted multiple times by a plurality of relay devices 2. It may be relayed.

  The user apparatus 1 has a function of communicating with the relay apparatus 2, the base station 3, and the like through radio. The user device 1 is, for example, a mobile phone, a smartphone, a tablet, a mobile router, or a wearable terminal. The user device 1 may be any user device as long as it has a communication function. The user device 1 includes a CPU such as a processor, a memory device such as a ROM, a RAM, or a flash memory, an antenna for communicating with the relay device 2 or the base station 3, an RF (Radio Frequency) device, a display that performs antenna pict display, and a touch panel It consists of hardware resources such as. Each function and process of the user device 1 may be realized by a processor processing or executing data or a program stored in the memory device. However, the user apparatus 1 is not limited to the hardware configuration described above, and may have any other appropriate hardware configuration.

  The relay device 2 performs communication between the user device 1 and the base station 3 through radio. The relay device 2 includes a CPU such as a processor, a memory device such as a ROM, a RAM, or a flash memory, and hardware resources such as an antenna for communicating with the user device 1, the base station 3, and the like. Each function and process of the relay device 2 may be realized by a processor processing or executing data or a program stored in the memory device. However, the relay device 2 is not limited to the hardware configuration described above, and may have any other appropriate hardware configuration.

  The base station 3 communicates with the user apparatus 1 through radio. The base station 3 is a hardware resource such as a CPU such as a processor, a memory device such as a ROM, a RAM or a flash memory, an antenna for communicating with the user device 1 or the like, a communication interface device for communicating with an adjacent base station or the like Consists of. Each function and process of the base station 3 may be realized by a processor processing or executing data or a program stored in a memory device. However, the base station 3 is not limited to the hardware configuration described above, and may have any other appropriate hardware configuration.

  In the present embodiment, relay device 2 will be described as including both a relay device used for the layer 3 relay technology and a user device having a function of transferring a signal using the D2D relay technology. That is, when this embodiment is applied to the D2D relay technology, the relay apparatus 2 described in this embodiment corresponds to the user apparatus 1 having a function of transferring a signal, and is described in this embodiment. The user device 1 corresponds to a user device that finally receives the transferred data.

  In the present embodiment, when each of the plurality of relay apparatuses 2 is described separately, for convenience, a reference numeral such as the relay apparatus 2a, the relay apparatus 2b, the relay apparatus 2c,. Further, when viewed from a certain relay device 2, the relay device 2 installed on the base station 3 side may be referred to as “the previous relay device 2”. Further, the relay device 2 installed on the user device 1 side when viewed from a certain relay device 2 may be referred to as a “next relay device 2”.

  In the mobile communication system according to the present embodiment, relay apparatus 2 measures the reception quality of a radio signal received from base station 3 and transmits information indicating the measured reception quality to user apparatus 1. The user apparatus 1 grasps the reception quality of the whole radio section between the base station 3 and the user apparatus 1 using the information and the reception quality of the radio signal received by the user apparatus 1 from the relay apparatus 2.

  Thereby, when performing the predetermined control based on the reception quality of the radio signal, the user apparatus 1 appropriately performs the predetermined control based on the reception quality of the entire radio section between the base station 3 and the user apparatus 1 itself. It becomes possible to do.

  Similarly, the mobile communication system according to the embodiment includes a plurality of relay devices 2 (for example, assumed to be the relay device 2a and the relay device 2b), and the signals of the base station 3 are transmitted a plurality of times by the plurality of relay devices 2. When relaying, the relay apparatus 2a that directly communicates with the base station 3 measures the reception quality of the radio signal received from the base station 3, and transmits information indicating the measured reception quality to the next relay apparatus 2b. The relay apparatus 2b grasps the reception quality of the entire radio section between the base station 3 and the relay apparatus 2b itself using the information and the reception quality of the radio signal received from the relay apparatus 2a. Further, the relay device 2b transmits information indicating the received quality of the entire wireless section to the user device 1. The user apparatus 1 grasps the reception quality of the entire radio section between the base station 3 and the user apparatus 1 using the information and the reception quality of the radio signal received from the relay apparatus 2b.

  Thereby, when performing the predetermined control based on the reception quality of the radio signal, the user apparatus 1 appropriately performs the predetermined control based on the reception quality of the entire radio section between the base station 3 and the user apparatus 1 itself. It becomes possible to do. In addition, the relay apparatus 2 can perform predetermined control without being limited to the user apparatus 1. Thereby, when the relay apparatus 2b performs predetermined control based on the reception quality of the radio signal, the relay apparatus 2b appropriately performs the predetermined control based on the reception quality of the entire radio section between the base station 3 and the relay apparatus 2b itself. It becomes possible to do.

[First embodiment]
Hereinafter, as a first embodiment, a case where the user apparatus 1 performs antenna pictogram display as predetermined control will be described. The first embodiment is not limited to the antenna picture display, and can be applied to other controls.

<Functional configuration>
Hereinafter, functional configuration examples of the user device 1 and the relay device 2 that execute the operation of the first embodiment will be described.

(User device)
FIG. 7 is a diagram illustrating an example of a functional configuration of the user apparatus according to the first embodiment. As illustrated in FIG. 7, the user apparatus 1 includes a signal reception unit 101, a signal transmission unit 102, a quality reference information reception unit 103, a reception quality measurement unit 104, and a control unit 105. Note that FIG. 7 shows only functional units that are particularly relevant to the present invention in the user apparatus 1, and the user apparatus 1 also has a function (not shown) for performing an operation based on at least LTE.

  The signal reception unit 101 includes a function of receiving various downlink signals from the relay device 2 and acquiring higher layer information from the received physical layer signal. The signal transmission unit 102 is transmitted from the user device 1. It includes a function of generating various signals of the physical layer from the information of the upper layer to be transmitted and transmitting it to the relay device 2.

  Further, the signal transmission unit 102 includes a function of notifying the relay device 2 that it has the capability (function) to receive (process) the quality standard information. Here, the “quality standard information” is information notified from the relay apparatus 2 to the user apparatus 1 and is information indicating the reception quality of the entire radio section from the base station 3 to the relay apparatus 2. The quality standard information is, for example, RSRQ, RSRP, RSSI (Received Signal Strength Indicator), CQI (Channel Quality Indicator), or the like. Further, the quality standard information may be these values themselves, or may be expressed with a predetermined granularity by converting these values into, for example, predetermined numbers, alphabets or symbols. Good.

  The quality standard information receiving unit 103 receives the quality standard information from the relay device 2 via the signal receiving unit 101. The quality standard information receiving unit 103 stores the received quality standard information in a memory or the like. When the quality standard information receiving unit 103 detects that the quality standard information received from the relay apparatus 2 has been updated, the quality standard information receiving unit 103 rewrites the quality standard information stored in the memory or the like with the updated quality standard information.

  The reception quality measurement unit 104 measures the reception quality of the DL signal received from the relay apparatus 2. The reception quality is, for example, RSRQ, RSRP, RSSI, CQI, or the like.

  The control unit 105 performs predetermined control based on the quality reference information received from the relay device 2 and the reception quality measured by the reception quality measurement unit 104. An example of the predetermined control is, for example, an antenna picture display. Note that, when the quality reference information is not received from the relay device 2, the control unit 105 performs the predetermined control based on the reception quality measured by the reception quality measurement unit 104. In addition, when the quality standard information received from the relay apparatus 2 is updated, the control unit 105 repeatedly performs predetermined control based on the updated quality standard information and the reception quality measured by the reception quality measurement unit 104. You may do it.

(Relay device)
FIG. 8 is a diagram illustrating an example of a functional configuration of the relay device according to the first embodiment. As illustrated in FIG. 8, the relay device 2 includes a signal reception unit 201, a signal transmission unit 202, a reception quality measurement unit 203, and a quality standard information notification unit 204. FIG. 8 shows only functional units particularly related to the present invention in the relay device 2, and the relay device 2 also has a function (not shown) for performing an operation based on at least LTE.

  The signal reception unit 201 includes a function of receiving various downlink (uplink) signals from the base station 3 or another relay apparatus 2 and acquiring higher layer information from the received physical layer signal. 202 includes a function of generating various signals of the physical layer from the information of the higher layer acquired by the signal receiving unit 201 and transmitting (relaying) the signals to the base station 3 or another relay apparatus 2.

  In addition, when the signal receiving unit 201 receives quality standard information from another relay device 2 (the previous relay device 2), the signal receiving unit 201 transmits the received quality standard information to the quality standard information notifying unit 204.

  The signal transmission unit 202 also notifies the base station 3 or another relay device 2 (the previous relay device 2) that it has the capability (function) to receive (process) the quality standard information. including.

  The reception quality measurement unit 203 measures the reception quality of the radio signal of the DL signal received from the base station 3 or another relay device 2 (the previous relay device 2). The reception quality is, for example, RSRQ, RSRP, RSSI, CQI, or the like. The reception quality measurement unit 203 may measure the reception quality of the radio signal at a predetermined interval or a predetermined cycle.

  The quality standard information notifying unit 204 generates quality standard information from the reception quality measured by the reception quality measuring unit 203, and uses the generated quality standard information as another relay device 2 (next relay device 2) or the user device 1. Are transmitted via the signal transmission unit 202.

  In addition, the quality standard information notification unit 204, when receiving quality standard information from another relay device 2 (the previous relay device 2), is measured by the quality standard information and the reception quality measurement unit 203. Based on the received quality, new quality standard information is generated, and the generated new quality standard information is transmitted to another relay apparatus 2 (next relay apparatus 2) or the user apparatus 1 via the signal transmission unit 202. . That is, each time the quality standard information passes through the relay device 2, the reception quality of the wireless section between the devices is taken into account.

<Processing procedure>
(Processing procedure (1))
FIG. 9 is a sequence diagram illustrating an example of a processing procedure (part 1) performed by the mobile communication system according to the first embodiment. FIG. 9 shows an example of a processing procedure when one relay device 2 is included in the mobile communication system.

  In step S <b> 101, the base station 3 transmits a radio signal to the relay device 2. The radio signal is not particularly limited in type, but is a signal including, for example, a cell specific reference signal (CRS).

  In step S102, the reception quality measuring unit 203 of the relay apparatus 2 measures the reception quality (RSRQ, RSRP, RSSI, CQI, etc.) of the radio signal received in step S101.

  In step S103, the quality standard information notifying unit 204 of the relay apparatus 2 generates quality standard information based on the reception quality measured in the processing procedure in step S102. For example, the quality standard information notifying unit 204 may store the value of the reception quality (RSRQ, RSRP, RSSI, CQI, etc.) measured in the processing procedure of step S102 as it is in the quality standard information, or the value of the reception quality May be converted into a predetermined granularity (for example, a predetermined number, alphabet or symbol) and stored in the quality standard information. In addition, when the reception quality value is converted into a predetermined granularity and stored in the quality standard information, it is necessary to share information (conversion table) indicating the conversion method between the user apparatus 1 and the relay apparatus 2 in advance. is there. Therefore, the quality standard information notifying unit 204 of the relay apparatus 2 sends information indicating the conversion method (conversion table) to the user apparatus 1 as broadcast information, an RRC (Radio Resource Control) signal, a predetermined D2D signal (PSCCH (Physical Sidelink Control)). (Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), etc.).

  In step S104, the signal transmission unit 102 of the user apparatus 1 notifies the relay apparatus 2 that the user apparatus 1 itself has the capability (function) to receive (process) the quality standard information. Note that the processing procedure of step S104 is not necessarily performed at the timing shown in FIG. For example, the UE capability information signal transmitted when the user apparatus 1 attaches to the relay apparatus 2 may be used for notification, or a predetermined D2D signal (PSCCH, PSSCH, PSDCH, etc.) may be used. It may be notified at an arbitrary timing.

  In step S105, the quality standard information notification unit 204 of the relay apparatus 2 transmits a signal including the quality standard information to the user apparatus 1. The signal may be broadcast information, an RRC signal, or a predetermined D2D signal, for example. The RRC signal may be, for example, an RRC Connection Reconfiguration signal. The predetermined D2D signal may be PSCCH, PSSCH, PSDCH, or the like.

  Note that the processing procedure of step S105 may be performed only when it is notified in the processing procedure of step S104 that the user apparatus 1 has the ability to receive quality standard information.

  In step S106, the quality standard information notification unit 204 of the relay apparatus 2 transmits a paging signal to the user apparatus 1, and notifies the user apparatus 1 that the quality standard information included in the broadcast information has been updated.

  Here, since the reception quality of the radio signal fluctuates due to the influence of propagation conditions, interference, and the like, the reception quality measurement unit 203 and the quality reference information notification unit 204 of the relay apparatus 2 perform the processing procedure of steps S102 to S105 as a predetermined. The latest quality standard information may be transmitted to the user apparatus 1 by repeatedly performing this interval or a predetermined cycle. In addition, the relay device 2 is configured to notify the user device 1 that the quality standard information has been updated only when the quality standard information is included in the broadcast information and transmitted in the processing procedure of step S105. A processing procedure may be performed.

  In step S107, the reception quality measurement unit 104 of the user apparatus 1 measures the reception quality (RSRQ, RSRP, RSSI, CQI, etc.) of the radio signal transmitted from the relay apparatus 2. Note that the radio signal for measuring the reception quality is not limited to the radio signal transmitted in the processing procedure of step S105. You may make it measure reception quality using another radio signal (CRS etc.).

  In step S108, the control unit 105 of the user apparatus 1 performs antenna picture display based on the quality reference information received in the processing procedure in step S105 and the reception quality measured in the processing procedure in step S107. The control unit 105 does not receive the quality standard information from the relay device 2 (for example, before the process of S105 is performed or when there is no function for transmitting the quality standard information to the relay device 2). Based on the received power measured in the processing procedure of S107, antenna pictogram display may be performed as usual.

  In addition, when the quality standard information notified by the process procedure of step S105 is updated, the user apparatus 1 may be made to update the antenna picture display by performing the process procedure of step S107 and step S108 again. .

  FIG. 10 is a flowchart illustrating an example of a processing procedure when the user apparatus performs antenna pictogram display. FIG. 10 shows details of a processing procedure performed by the user apparatus 1 in FIG.

  Step S201 is the same as step S107 in FIG.

  In step S <b> 202, the control unit 105 of the user device 1 confirms whether quality standard information is received from the relay device 2. If quality standard information has been received, the process proceeds to step S203. If quality standard information has not been received, the process proceeds to step S204.

  In step S203, the control unit 105 of the user apparatus 1 displays the antenna pictogram display based on a value obtained by multiplying, for example, the quality standard information received from the relay apparatus 2 and the reception quality measured in the processing procedure of step S201. Do. As a specific example, for example, the control unit 105 multiplies the received power represented by the quality standard information received from the relay apparatus 2 by the received power measured in the processing procedure of step S201, thereby causing the base station 3 to It is also possible to calculate the received power taking into account the entire wireless section from the user device 1 to the user apparatus 1 and perform the antenna pictogram display based on the calculated received power intensity.

  In step S204, the control unit 105 of the user apparatus 1 performs antenna pictographic display as usual based on the received power measured in the processing procedure of step S201.

(Processing procedure (2))
FIG. 11 is a sequence diagram illustrating an example of a processing procedure (part 2) performed by the mobile communication system according to the first embodiment. FIG. 11 shows an example of a processing procedure when two relay apparatuses 2a and 2b are included in the mobile communication system. The relay device 2a is a relay device installed on the base station 3 side, and the relay device 2b is a relay device installed on the user device 1 side. That is, in the example of FIG. 11, the radio signal transmitted from the base station 3 is transferred to the user apparatus 1 in the order of the relay apparatus 2 a and the relay apparatus 2 b.

  The processing procedures in steps S301 and S302 are the same as those in steps S101 and S102 in FIG.

  In step S303, the quality standard information notification unit 204 of the relay apparatus 2a generates quality standard information based on the reception quality measured in the processing procedure in step S302. For example, the quality standard information notifying unit 204 may store the value of the reception quality (RSRQ, RSRP, RSSI, CQI, etc.) measured in the processing procedure of step S302 as it is in the quality standard information, or the value of the reception quality May be converted into a predetermined granularity (for example, a predetermined number, alphabet or symbol) and stored in the quality standard information. In addition, when the reception quality value is converted into a predetermined granularity and stored in the quality standard information, information indicating the conversion method (conversion table) needs to be shared in advance between the relay device 2a and the relay device 2b. is there. In this case, the quality standard information notification unit 204 of the relay apparatus 2a transmits information (conversion table) indicating the conversion method to the relay apparatus 2b by broadcast information, RRC signal, predetermined D2D signal (PSCCH, PSSCH, PSDCH, etc.), etc. You may make it transmit.

  In step S304, the signal transmission unit 202 of the relay apparatus 2b notifies the relay apparatus 2a that the relay apparatus 2b itself has the capability (function) to receive (process) the quality standard information. Note that the processing procedure of step S304 is not necessarily performed at the timing shown in FIG. The relay device 2b and the relay device 2a may be performed at a timing at which they can communicate with each other. For example, notification may be made at an arbitrary timing using a predetermined D2D signal (PSCCH, PSSCH, PSDCH, etc.).

  In step S305, the quality standard information notification unit 204 of the relay apparatus 2a transmits a signal including the quality standard information to the relay apparatus 2b. The signal may be broadcast information, an RRC signal, or a predetermined D2D signal, for example. The RRC signal may be, for example, an RRC Connection Reconfiguration signal. The predetermined D2D signal may be PSCCH, PSSCH, PSDCH, or the like. Note that the processing procedure of step S305 may be performed only when it is notified in the processing procedure of step S304 that the relay apparatus 2b has the ability to receive quality standard information.

  Here, since the reception quality of the radio signal fluctuates due to the influence of propagation conditions, interference, and the like, the reception quality measurement unit 203 and the quality reference information notification unit 204 of the relay device 2a perform the processing procedure from step S302 to step S305 in a predetermined manner. The latest quality standard information may be transmitted to the relay device 2b by repeatedly performing this interval or a predetermined cycle.

  The signal receiving unit 201 of the relay device 2b transmits the quality standard information received from the relay device 2a to the quality standard information notification unit 204. In addition, in the process procedure of step S305, when quality standard information is transmitted using broadcast information, the signal reception unit 201 of the relay device 2b periodically receives broadcast information, and whether the quality standard information is updated. You may make it confirm. Further, the signal receiving unit 201 of the relay device 2b may receive in advance information related to the update timing or update cycle of the quality standard information from the relay device 2a.

  In step S306, the reception quality measurement unit 203 of the relay device 2b measures the reception quality (RSRQ, RSRP, RSSI, CQI, etc.) of the radio signal transmitted from the relay device 2a. Note that the radio signal for measuring the reception quality is not limited to the radio signal transmitted in the processing procedure of step S305. You may make it measure reception quality using another radio signal (CRS etc.).

  In step S307, the quality standard information notifying unit 204 of the relay apparatus 2b generates new quality standard information (based on the quality standard information received in the processing procedure in step S305 and the reception quality measured in the processing procedure in step S306 ( Quality standard information to be transmitted to the user apparatus 1). For example, the quality standard information notifying unit 204 sets a value obtained by multiplying the received power represented by the quality standard information received from the relay apparatus 2a and the received power measured in the processing procedure of step S306 as new quality standard information. The reception quality may be stored in

  The quality standard information notifying unit 204 also receives the quality standard received from the relay device 2a when the received power measured in step S306 is greater than or equal to a predetermined received power (for example, when the received power is very large). The information may be used as new quality standard information.

  In addition, the quality standard information notification unit 204 includes a RAT (Radio Access Technology) or frequency between the relay device 2a and the relay device 2b itself, a RAT or frequency between the user device 1 and the relay device 2b itself, and the relay device 2b. New quality standard information may be generated by performing weighting according to the accuracy of an amplifier included in the device.

  Further, the quality standard information notifying unit 204 may convert the value of the generated new quality standard information into a predetermined granularity (for example, a predetermined number, alphabet, or symbol) and store the new quality standard information in the new quality standard information. . In this case, it is necessary to share in advance information (conversion table) indicating the conversion method between the relay device 2b and the user device 1. In this case, the quality standard information notification unit 204 of the relay apparatus 2b transmits information (conversion table) indicating the conversion method to the user apparatus 1 by broadcast information, RRC signal, predetermined D2D signal (PSCCH, PSSCH, PSDCH, etc.), etc. You may make it transmit. Note that the conversion table shared between the relay device 2b and the user device 1 is a conversion table different from the conversion table shared between the relay device 2a and the relay device 2b described in step S303. Also good.

  The processing procedure from step S308 to step S312 is the same as the processing procedure from step S104 to step S108 in FIG.

  As described above, according to the first embodiment, the user apparatus 1 can display an antenna picture based on the reception quality of the entire radio section between the base station 3 and the user apparatus 1 itself. Thereby, the user of the user apparatus 1 can estimate a throughput closer to the actual situation. Further, the user apparatus 1 can update the antenna pictogram display even when the reception quality of the entire radio section between the base station 3 and the user apparatus 1 itself changes.

[Second Embodiment]
Next, a second embodiment will be described based on the drawings. In the second embodiment, a case where the user apparatus 1 or the relay apparatus 2 manages the connection state using quality standard information as predetermined control will be described. The second embodiment is not limited to managing the connection state, but can be applied to other controls.

  The description of the same components as those in the first embodiment is omitted. Also, points not particularly mentioned may be the same as those in the first embodiment.

  Note that the first embodiment and the second embodiment can be combined.

<Functional configuration>
Hereinafter, functional configuration examples of the user apparatus 1, the relay apparatus 2, and the base station 3 that execute the operation of the second embodiment will be described.

(User device)
FIG. 12 is a diagram illustrating an example of a functional configuration of the user apparatus according to the second embodiment. As illustrated in FIG. 12, the user apparatus 1 includes a signal reception unit 301, a signal transmission unit 302, a quality reference information reception unit 303, a reception quality measurement unit 304, and a control unit 305.

  The signal reception unit 301, the signal transmission unit 302, the quality reference information reception unit 303, and the reception quality measurement unit 304 are respectively the signal reception unit 101, the signal transmission unit 102, the quality reference information reception unit 103, and the reception quality measurement of FIG. Since it is the same as the unit 104, the description thereof is omitted.

  The control unit 305 performs predetermined control based on the quality reference information received from the relay device 2 and the reception quality measured by the reception quality measurement unit 304. An example of the predetermined control is management of a connection state (RRC connection state or the like) with the relay device 2, for example. The control unit 305 transmits information indicating a lower limit of signal quality (radio signal reception quality) required when communicating with the communication partner from the relay device 2 via the signal reception unit 301 (hereinafter referred to as “lower limit quality”). Information)). Further, the control unit 305 determines whether or not the reception quality of the entire radio section between the base station 3 and the user apparatus 1 itself is lower than the lower limit of the signal quality indicated by the lower limit quality information. When it is determined that the value falls below the lower limit, the control unit 305 disconnects the connection established with the relay device 2.

  Note that the control unit 305 may have a function of previously storing the lower limit quality information in a memory or the like of the user device 1 and transmitting the lower limit quality information to the relay device 2.

(Relay device)
FIG. 13 is a diagram illustrating an example of a functional configuration of the relay apparatus according to the second embodiment. As illustrated in FIG. 13, the relay device 2 includes a signal reception unit 401, a signal transmission unit 402, a reception quality measurement unit 403, a quality reference information notification unit 404, a lower limit quality information notification unit 405, and a connection state control unit 406. .

  The signal reception unit 401, signal transmission unit 402, reception quality measurement unit 403, and quality reference information notification unit 404 are respectively the signal reception unit 201, signal transmission unit 202, reception quality measurement unit 203, and quality reference information notification of FIG. Since it is the same as the unit 204, the description thereof is omitted.

  The lower limit quality information notification unit 405 transmits the lower limit quality information to the user device 1 or another relay device 2. The lower limit quality information may be stored in advance in a memory or the like of the relay device 2 or may be received from the base station 3 via the signal receiving unit 401.

  Based on the quality standard information and the reception quality and lower limit quality information measured by the reception quality measurement unit 403, the connection state control unit 406 receives the reception quality of the entire radio section between the base station 3 and the relay device 2 itself. Is lower than the lower limit of the signal quality indicated by the lower limit quality information. When it is determined that the value is lower than the lower limit, the connection state control unit 406 disconnects the connection established with the user device 1 or another relay device 2 (next relay device 2).

(base station)
FIG. 14 is a diagram illustrating an example of a functional configuration of the base station according to the second embodiment. As illustrated in FIG. 14, the base station 3 includes a signal reception unit 501, a signal transmission unit 502, and a lower limit quality information notification unit 503. FIG. 14 shows only functional units particularly related to the present invention in the base station 3, and the base station 3 also has a function (not shown) for performing an operation based on at least LTE.

  The signal transmission unit 502 includes a function of generating and transmitting various physical layer signals from upper layer information to be transmitted from the base station 3. The signal reception unit 501 includes a function of receiving various uplink signals from the user apparatus 1 or the relay apparatus 2 and acquiring higher layer information from the received physical layer signal.

  The lower limit quality information notification unit 503 transmits the lower limit quality information to the relay device 2. The lower limit quality information may be stored in advance in the memory of the base station 3 or the like.

<Processing procedure>
(Processing procedure (1))
FIG. 15 is a sequence diagram illustrating an example of a processing procedure (part 1) performed by the mobile communication system according to the second embodiment. FIG. 15 shows an example of a processing procedure when 1 to 3 relay apparatuses (2a, 2b, 2c) are included in the mobile communication system. In FIG. 15, the device shown on the left side may be the base station 3 or the relay device 2 (referred to as a relay device 2a for convenience). Further, the device shown on the right side may be the relay device 2 (described as the relay device 2c for convenience) or the user device 1. Moreover, although the apparatus shown in the center is the relay apparatus 2, it is described as the relay apparatus 2b for convenience.

  In step S401, the lower limit quality information notification unit 405 of the relay device 2a or the lower limit quality information notification unit 503 of the base station 3 transmits a signal including the lower limit quality information to the relay device 2b. When the relay apparatus 2a performs the process of step S401, the quality standard information notification unit 404 of the relay apparatus 2a may include quality standard information in addition to the lower limit quality information in the signal.

  In FIG. 15, the lower limit quality information notification unit 503 of the base station 3 may omit the processing procedure of step S401 by holding the lower limit quality information in the memory of the relay device 2b.

  Similarly, in FIG. 15, the quality standard information notifying unit 404 of the relay apparatus 2a transmits a signal including only the quality standard information in step S401 so that the lower limit quality information is held in the memory of the relay apparatus 2b. It may be.

  The processing procedures in steps S402 and S403 are the same as the processing procedures in steps S102 and S103 in FIG. 9, the processing procedures in steps S302 and S303 in FIG. 11, or the processing procedures in steps S306 and S307 in FIG. Therefore, explanation is omitted.

  In step S404, the signal transmission unit 102 of the user device 1 or the signal transmission unit 202 of the relay device 2c receives (processes) the quality reference information and the lower limit quality information in the relay device 2b by the user device 1 itself or the relay device 2c itself. That you have the ability to Note that the processing procedure of step S404 is not necessarily performed at the timing shown in FIG. The relay device 2b and the user device 1 (or the relay device 2a) may be performed at a timing at which they can communicate with each other. Further, for example, notification may be made at an arbitrary timing using a predetermined RRC signal or a predetermined D2D signal (PSCCH, PSSCH, PSDCH, etc.).

  In step S405, the quality standard information notification unit 404 and the lower limit quality information notification unit 405 of the relay apparatus 2b transmit a signal including the quality standard information and the lower limit quality information via the signal transmission unit 402. The signal may be broadcast information, an RRC signal, or a predetermined D2D signal, for example. The RRC signal may be, for example, an RRC Connection Reconfiguration signal. The predetermined D2D signal may be PSCCH, PSSCH, PSDCH, or the like. Note that the processing procedure of step S405 is performed only when it is notified in the processing procedure of step S404 that the user apparatus 1 or the relay apparatus 2c has the ability to receive quality standard information and lower limit quality information. May be.

  The processing procedure of step S406 is the same as step S106 of FIG. 9 or step S310 of FIG.

  The processing procedure in step S407 is the same as step S107 in FIG. 9, step S306 in FIG. 11, or step S311 and will not be described.

  In step S408, the control unit 305 of the user apparatus 1 or the connection state control unit 406 of the relay apparatus 2c receives the signal quality (reception of a radio signal) in which the reception quality indicated in the quality reference information received in step S405 is indicated by the lower limit quality information. If the received quality measured in step S407 is lower than the signal quality (reception quality of the radio signal) indicated in the lower limit quality information, or received quality indicated in the quality reference information received in step S405 and When both of the reception qualities measured in step S407 are lower than the signal quality (radio signal reception quality) indicated by the lower limit quality information, the process proceeds to step SS409.

  In step S409, the control unit 305 of the user device 1 or the connection state control unit 406 of the relay device 2c transmits a disconnection signal to the relay device 2b, and disconnects the connection with the relay device 2b.

(Processing procedure (2))
FIG. 16 is a sequence diagram illustrating an example of a processing procedure (part 2) performed by the mobile communication system according to the second embodiment. FIG. 16 shows an example of a processing procedure when 1 to 3 relay apparatuses (2a, 2b, 2c) are included in the mobile communication system, as in FIG. In this processing procedure (part 2), unlike the processing procedure (part 1), a disconnection signal is transmitted from the relay device 2b to the relay device 2c or the user device 1.

  The processing procedures in steps S501 through S503 are the same as those in steps S401 through S403 in FIG.

  In step S504, the connection state control unit 406 of the relay device 2b determines that the reception quality indicated by the quality reference information included in the signal received from the relay device 2a in step S501 is the signal quality (radio signal of the radio signal). The reception quality measured in step S502 is lower than the signal quality (reception quality of the radio signal) indicated by the lower limit quality information, or the quality reference information received from the relay device 2a in step S501. When both the received reception quality indicated and the reception quality measured in step S502 are lower than the signal quality (reception quality of the radio signal) indicated by the lower limit quality information, the process proceeds to step S505.

  In step S505, the connection state control unit 406 of the relay device 2b transmits a disconnection signal to the relay device 2c (or the user device 1), and disconnects the connection with the relay device 2b (or the user device 1).

(Processing procedure (modified example of the second))
In step S505, the connection state control unit 406 of the relay apparatus 2b transmits the quality standard information in which an invalid value (Out Of Range) is set instead of the disconnection signal to the relay apparatus 2c (or the user apparatus 1). May be. Further, the connection state control unit 406 (or the control unit 305 of the user device 1) of the relay device 2c that has received the quality standard information in which the invalid value is set relays using the same processing procedure as that in step S409 in FIG. You may make it cut | disconnect the connection between the apparatuses 2b.

(Processing procedure (3))
FIG. 17 is a sequence diagram illustrating an example of a processing procedure (part 3) performed by the mobile communication system according to the second embodiment. FIG. 17 shows an example of a processing procedure when one relay apparatus 2a or two relay apparatuses (2a, 2b) are included in the mobile communication system. In this processing procedure (part 3), the relay device 2a receives the lower limit quality information from the next relay device 2 (relay device 2b) or the user device 1.

  Steps S601 and S602 are respectively steps S102 and S103 of FIG. 9, steps S302 and S303 of FIG. 11, steps S306 and S307 of FIG. 11, steps S402 and S403 of FIG. 15, or FIG. Since it is the same as step S502 and step S503, the description is omitted.

  In step S603, the control unit 305 of the user apparatus 1 or the lower limit quality information notification unit 405 of the relay apparatus 2b transmits a lower limit quality information notification signal to the relay apparatus 2a. The signal includes lower limit quality information.

  Steps S604 and S605 are the same as steps S504 and S505 in FIG.

  In this processing procedure (part 3), in addition to the lower limit quality information received in step S603, the relay device 2a also receives the lower limit quality from the base station 3 or another relay device 2 (the previous relay device 2). Information may be received. In this case, the relay apparatus 2a may perform the processing procedure of step S604 using the lower limit quality information having a large reception quality value among the reception qualities (reception quality of radio signals) indicated by both the lower limit quality information. . Further, the relay device 2a may perform the processing procedure of step S604 using lower limit quality information having a small reception quality value. Further, the relay device 2a may calculate the average of each reception quality and perform the processing procedure of step S604.

  As described above, according to the second embodiment, the user apparatus 1 is connected to the relay apparatus 2 when the reception quality of the entire radio section between the base station 3 and the user apparatus 1 itself is deteriorated. Can be cut. Further, the relay device 2 can disconnect the connection with the immediately preceding relay device 2 when the reception quality of the entire radio section between the base station 3 and the relay device 2 itself is degraded. become. Thereby, it is assumed that the user of the user apparatus 1 does not need to try communication wastefully when the throughput in the entire wireless section is low. That is, according to the second embodiment, user convenience can be improved.

<Effect>
As described above, according to the mobile communication system in the present embodiment, a user apparatus that communicates with a relay apparatus that relays a signal of a base station, and a measurement unit that measures reception quality of a radio signal transmitted from the relay apparatus; Based on the reception means for receiving the reference information indicating the reception quality of the radio signal between the base station and the relay apparatus from the relay apparatus, the reception quality measured by the measurement means, and the reference information There is provided a user device having control means for performing predetermined control. With this configuration, a technique is provided that enables the user apparatus 1 to appropriately grasp the overall communication quality between the user apparatus 1 and the base station 3 when a radio signal from the base station is relayed. Is done.

  Further, the control unit may perform the predetermined control based on the reception quality measured by the measurement unit when the reference information is not received from the relay device. With this configuration, the user apparatus 1 can perform conventional control even when the reference information (quality reference information) is not received from the relay apparatus 2.

  Further, the predetermined control is an antenna pictogram display, the receiving unit detects that the reference information transmitted from the relay apparatus is updated, and the control unit is measured by the measuring unit. The antenna pictogram display may be updated based on the reception quality and the updated reference information. With this configuration, the user apparatus 1 can display an antenna picture based on the reception quality of the entire radio section between the base station 3 and the user apparatus 1 itself. Thereby, the user of the user apparatus 1 can estimate a throughput closer to the actual situation. Also, with this configuration, the user apparatus 1 can update the antenna picture display even when the reception quality of the entire radio section between the base station 3 and the user apparatus 1 itself changes.

  Moreover, you may make it further have a notification means to notify the said relay apparatus that the said user apparatus has the capability to receive the said reference information. With this configuration, the relay device 2 can avoid transmitting unnecessary signals to the user device 1 that does not have the function according to the present embodiment.

  Further, the control means receives lower limit quality information indicating a lower limit of signal quality necessary for communication from the relay device, the received lower limit quality information, and the reception quality measured by the measurement means or the reference information And a disconnection signal may be transmitted to the relay device. With this configuration, the user apparatus 1 can disconnect the connection with the relay apparatus 2 when the reception quality of the entire radio section between the base station 3 and the user apparatus 1 itself is degraded. . Thereby, since the user of the user apparatus 1 does not need to try communication wastefully when the throughput in the entire wireless section is low, it is possible to improve user convenience.

  Moreover, according to the mobile communication system in the present embodiment, the first relay station relays a base station signal to a user apparatus, and is transmitted from the base station or another relay apparatus different from the relay apparatus. Measuring means for measuring the reception quality of the first radio signal, and transmission means for generating the first reference information based on the reception quality of the first radio signal and transmitting the generated first reference information to the user device Are provided. With this configuration, when a radio signal from a base station is relayed, a technique that allows the user apparatus 1 to appropriately grasp the overall communication quality between the user apparatus 1 and the base station 3 Is provided.

The measuring means measures the reception quality of the first radio signal at a predetermined interval,
The transmission means generates first reference information based on the reception quality of the first radio signal measured at a predetermined interval, and when the first reference information is updated, paging is performed on the user apparatus. May be transmitted. With this configuration, the relay device 2 can notify the user device 1 that the reference information (quality reference information) has been updated.

  Also, a second radio signal generated from the other relay device based on the reception quality of the second radio signal between the relay device different from the base station or the other relay device and the other relay device. Receiving means for receiving reference information, wherein the transmitting means generates the first reference information based on the reception quality of the first radio signal and the second reference information. Also good. With this configuration, even when a radio signal from the base station 3 is relayed via a plurality of relay devices, the overall communication quality between the user device 1 and the base station 3 with respect to the user device 1 Can be grasped appropriately.

  Further, a control means for transmitting a disconnection signal to the user apparatus based on the reception quality of the first radio signal or the first reference information and lower limit quality information indicating a lower limit of signal quality necessary for communication, You may make it have further. With this configuration, the user apparatus 1 can disconnect the connection with the relay apparatus 2 when the reception quality of the entire radio section between the base station 3 and the user apparatus 1 itself is degraded. . Thereby, since the user of the user apparatus 1 does not need to try communication wastefully when the throughput in the entire wireless section is low, it is possible to improve user convenience.

  Also, the mobile communication system according to the present embodiment is a communication control method executed by a mobile communication system having a relay device that relays a signal of a base station to a user device and a user device that communicates with the relay device. A measuring step in which the relay device measures reception quality of a first radio signal transmitted from the base station or another relay device different from the relay device; and Generating reference information based on the reception quality of the signal, transmitting the generated reference information to the user apparatus; and measuring the reception quality of the second radio signal transmitted from the relay apparatus by the user apparatus A measuring step, a receiving step in which the user device receives reference information from the relay device, and a second step in which the user device is measured in the measuring step. And a control step of performing predetermined control based on the reception quality and the reference information of the wireless signal, the communication control method is provided. With this configuration, a technique is provided that makes it possible to appropriately grasp the overall communication quality with the base station when a radio signal from the base station is relayed.

<Supplement of embodiment>
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. I will. Although specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may be applied to the matters described in (if not inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. The order of the sequences and flowcharts described in the embodiments may be changed as long as there is no contradiction. For convenience of description of the processing, the user apparatus 1, the relay apparatus 2, and the base station 3 have been described using functional block diagrams. However, such an apparatus may be implemented by hardware, software, or a combination thereof. Good. According to the embodiment of the present invention, software operated by the processor of the user apparatus 1, software operated by the processor of the relay apparatus 2, and software operated by the processor of the base station 3 are respectively random access memory (RAM) and flash It may be stored in a memory, a read-only memory (ROM), an EPROM, an EEPROM, a register, a hard disk (HDD), a removable disk, a CD-ROM, a database, a server, or any other suitable storage medium.

  The present invention is not limited to the above embodiments, and various modifications, modifications, alternatives, substitutions, and the like are included in the present invention without departing from the spirit of the present invention.

  In each embodiment, reception quality measurement section 104 or reception quality measurement section 304 is an example of a measurement unit. The quality standard information receiving unit 103 or the quality standard information receiving unit 303 is an example of a receiving unit. The control unit 105 or the control unit 305 is an example of a control unit. Quality standard information is an example of standard information. The signal transmission unit 102 or the signal transmission unit 302 is an example of a notification unit. The reception quality measurement unit 203 or the reception quality measurement unit 403 is an example of a measurement unit. The quality standard information notification unit 204 or the quality standard information notification unit 404 is an example of a transmission unit. The signal receiving unit 201 or the signal receiving unit 401 is an example of a receiving unit. The connection state control unit 406 is an example of a control unit.

DESCRIPTION OF SYMBOLS 1 User apparatus 2 Relay apparatus 3 Base station 101 Signal reception part 102 Signal transmission part 103 Quality reference information reception part 104 Reception quality measurement part 105 Control part 201 Signal reception part 202 Signal transmission part 203 Reception quality measurement part 204 Quality reference information notification part 301 signal receiving unit 302 signal transmitting unit 303 quality reference information receiving unit 304 reception quality measuring unit 305 control unit 401 signal receiving unit 402 signal transmitting unit 403 reception quality measuring unit 404 quality standard information notifying unit 405 lower limit quality information notifying unit 406 connection state Control unit 501 Signal reception unit 502 Signal transmission unit 503 Lower limit quality information notification unit

Claims (10)

A user apparatus that communicates with a relay apparatus that relays a signal of a base station,
Measuring means for measuring reception quality of a radio signal transmitted from the relay device;
Receiving means for receiving, from the relay device, reference information indicating reception quality of a radio signal between the base station and the relay device;
Control means for performing predetermined control based on the reception quality measured by the measurement means and the reference information;
A user device.   The user apparatus according to claim 1, wherein the control unit performs the predetermined control based on reception quality measured by the measurement unit when the reference information is not received from the relay device. The predetermined control is antenna pictogram display,
The receiving means detects that the reference information transmitted from the relay device has been updated,
The user apparatus according to claim 1, wherein the control unit updates the antenna pictogram display based on the reception quality measured by the measurement unit and the updated reference information. Notifying means for notifying the relay device that the user device has the ability to receive the reference information;
The user apparatus according to any one of claims 1 to 3, further comprising:   The control means receives, from the relay device, lower limit quality information indicating a lower limit of signal quality necessary for communication, the received lower limit quality information, the reception quality measured by the measurement means or the reference information, 5. The user apparatus according to claim 1, wherein a disconnection signal is transmitted to the relay apparatus based on A relay device that relays a base station signal to a user device,
Measuring means for measuring the reception quality of the first radio signal transmitted from the base station or another relay device different from the relay device;
Transmission means for generating first reference information based on reception quality of the first radio signal, and transmitting the generated first reference information to the user device;
A relay device. The measuring means measures the reception quality of the first radio signal at a predetermined interval;
The transmission means generates first reference information based on the reception quality of the first radio signal measured at a predetermined interval, and when the first reference information is updated, paging is performed on the user apparatus. The relay apparatus according to claim 6, which transmits Second reference information generated from the other relay device based on the reception quality of the second radio signal between the relay device different from the base station or the other relay device and the other relay device Receiving means for receiving,
Further comprising
The relay apparatus according to claim 6 or 7, wherein the transmission unit generates the first reference information based on reception quality of the first radio signal and the second reference information. Control means for transmitting a disconnection signal to the user apparatus based on the reception quality of the first radio signal or the first reference information and lower limit quality information indicating a lower limit of signal quality necessary for communication;
The relay device according to any one of claims 6 to 8, further comprising: A communication control method executed by a mobile communication system having a relay device that relays a signal of a base station to a user device and a user device that communicates with the relay device,
A measuring step in which the relay device measures reception quality of a first radio signal transmitted from the base station or another relay device different from the relay device;
The relay device generates reference information based on the reception quality of the first radio signal, and transmits the generated reference information to the user device;
A measuring step in which the user apparatus measures reception quality of a second radio signal transmitted from the relay apparatus;
A receiving step in which the user apparatus receives reference information from the relay apparatus;
A control step in which the user apparatus performs a predetermined control based on the reception quality of the second radio signal measured in the measurement step and the reference information;
A communication control method.

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