JP6695400B2

JP6695400B2 - Base station device, mobile station device, wireless communication system, base station device communication control method, and mobile station device communication control method

Info

Publication number: JP6695400B2
Application number: JP2018192107A
Authority: JP
Inventors: 耕太郎椎▲崎▼; 田中　良紀; 良紀田中; 大介実川; 義博河▲崎▼
Original assignee: Fujitsu Connected Technologies Ltd
Current assignee: Fujitsu Connected Technologies Ltd
Priority date: 2018-10-10
Filing date: 2018-10-10
Publication date: 2020-05-20
Anticipated expiration: 2034-06-25
Also published as: JP2019004526A

Description

本発明は、基地局装置、移動局装置、無線通信システム、基地局装置の通信制御方法及び移動局装置の通信制御方法に関する。 The present invention relates to a base station device, a mobile station device, a wireless communication system, a base station device communication control method, and a mobile station device communication control method.

近年、基地局を経由して移動局同士で無線通信する通常通信であるセルラー通信の他に、基地局を経由することなく、移動局同士で直接無線通信する直接通信であるＤ２Ｄ（Device to Device）通信が知られている。移動局は、セルラー通信で使用する場合にＣＵＥ（Cellular User Equipment）として機能し、Ｄ２Ｄ通信で使用する場合にＤＵＥ（D2D User Equipment）として機能する。 In recent years, in addition to cellular communication which is normal communication in which mobile stations wirelessly communicate with each other via a base station, D2D (Device to Device) which is direct communication in which mobile stations directly wirelessly communicate with each other without passing through a base station. ) Communication is known. The mobile station functions as CUE (Cellular User Equipment) when used in cellular communication, and functions as DUE (D2D User Equipment) when used in D2D communication.

そして、今後のシステムモデルとして、基地局（ｅＮＢ：eNodeB）がＣＵＥ及びＤＵＥに無線リソースを割り当てることで、ＣＵＥ及びＤＵＥが共存できるようにする。 Then, as a future system model, the base station (eNB: eNodeB) allocates radio resources to the CUE and the DUE so that the CUE and the DUE can coexist.

米国特許出願公開第２００９／０３２５６２５号明細書U.S. Patent Application Publication No. 2009/0325625

“Dynamic Power Control Mechanism for Interference Coordination of Device-to-Device Communication in Cellular Networks”, Sungkyunkwan University, IEEE Ubiquitous and Future Networks (ICUFN), 2011 Third International Conference, 15-17 June 2011.“Dynamic Power Control Mechanism for Interference Coordination of Device-to-Device Communication in Cellular Networks”, Sungkyunkwan University, IEEE Ubiquitous and Future Networks (ICUFN), 2011 Third International Conference, 15-17 June 2011.

しかしながら、例えば、ＣＵＥとＤＵＥとが同一の無線リソースを共用した場合、Ｄ２Ｄ通信によってＣＵＥからのＵＬ（Up Link）信号が干渉されることが想定される。つま
り、Ｄ２Ｄ通信によるセルラー通信への信号干渉の影響が大である。 However, for example, when the CUE and the DUE share the same radio resource, it is assumed that the UL (Up Link) signal from the CUE is interfered by the D2D communication. That is, the influence of signal interference on the cellular communication by the D2D communication is large.

一つの側面では、Ｄ２Ｄ通信によるセルラー通信への信号干渉の影響を低減できる基地局装置、移動局装置及び無線通信システム等を提供することを目的とする。 In one aspect, it is an object to provide a base station device, a mobile station device, a wireless communication system, and the like that can reduce the influence of signal interference on the cellular communication by D2D communication.

一つの態様の基地局装置は、制御部を有する。制御部は、移動局装置同士が基地局装置を介して無線通信を実行する第１通信及び、前記移動局装置同士が前記基地局装置を介さずに直接無線通信を実行する第２通信に関する各移動局装置の無線状態を示す情報に基づき、前記第２通信を実行する前記移動局装置に対して、前記第２通信を制御する制御情報を通知する。 The base station device according to one aspect includes a control unit. The control unit relates to first communication in which mobile station devices perform wireless communication via base station devices and second communication in which the mobile station devices directly perform wireless communication without the base station device. Based on the information indicating the wireless state of the mobile station apparatus, the mobile station apparatus that executes the second communication is notified of control information that controls the second communication.

一つの態様では、第２通信による第１通信への信号干渉の影響を低減できる。 In one aspect, the influence of signal interference on the first communication by the second communication can be reduced.

図１は、実施例１の無線システムの一例を示す説明図である。FIG. 1 is an explanatory diagram illustrating an example of the wireless system according to the first embodiment. 図２は、実施例１のｅＮＢの一例を示すブロック図である。FIG. 2 is a block diagram illustrating an example of the eNB according to the first embodiment. 図３は、実施例１のＵＥの一例を示すブロック図である。FIG. 3 is a block diagram illustrating an example of the UE according to the first embodiment. 図４は、実施例１の制御フラグを付加するＤＣＩフォーマットの一例を示す説明図である。FIG. 4 is an explanatory diagram showing an example of the DCI format to which the control flag of the first embodiment is added. 図５は、実施例１の通信制御処理に関わるＤＵＥの処理動作の一例を示すフローチャートである。FIG. 5 is a flowchart illustrating an example of the processing operation of the DUE related to the communication control processing of the first embodiment. 図６は、実施例２のｅＮＢの一例を示すブロック図である。FIG. 6 is a block diagram illustrating an example of the eNB according to the second embodiment. 図７は、位置判定部の一例を示すブロック図である。FIG. 7 is a block diagram showing an example of the position determination unit. 図８は、実施例３の制御フラグを付加する専用フォーマットの一例を示す説明図である。FIG. 8 is an explanatory diagram showing an example of a dedicated format for adding a control flag according to the third embodiment. 図９は、実施例４の制御フラグを付加するＤＣＩフォーマットの一例を示す説明図である。FIG. 9 is an explanatory diagram showing an example of the DCI format to which the control flag of the fourth embodiment is added. 図１０は、実施例５の制御フラグを付加するＤＣＩフォーマットの一例を示す説明図である。FIG. 10 is an explanatory diagram showing an example of the DCI format to which the control flag of the fifth embodiment is added. 図１１は、実施例６の通信制御処理に関わるＤＵＥの処理動作の一例を示すフローチャートである。FIG. 11 is a flowchart illustrating an example of the processing operation of the DUE related to the communication control processing of the sixth embodiment. 図１２は、実施例７の通信制御処理に関わるＤＵＥの処理動作の一例を示すフローチャートである。FIG. 12 is a flowchart illustrating an example of the processing operation of the DUE related to the communication control processing of the seventh embodiment.

以下、図面に基づいて、本願の開示する基地局装置、移動局装置、無線通信システム、基地局装置の通信制御方法及び移動局装置の通信制御方法の実施例を詳細に説明する。尚、各実施例により、開示技術が限定されるものではない。また、以下に示す各実施例は、矛盾を起こさない範囲で適宜組み合わせても良い。 Embodiments of a base station apparatus, a mobile station apparatus, a wireless communication system, a communication control method for a base station apparatus, and a communication control method for a mobile station apparatus disclosed in the present application will be described in detail below with reference to the drawings. The disclosed technology is not limited to the embodiments. In addition, the respective embodiments described below may be appropriately combined within a range that does not cause a contradiction.

図１は、実施例１の無線システムの一例を示す説明図である。図１に示す無線システム１は、ｅＮＢ２と、複数のＵＥ（User Equipment）３とを有する。ＵＥ３は、セルラー通信等の第１通信又は、Ｄ２Ｄ通信等の第２通信を切替可能に実行できる機能を有する。
ＵＥ３は、セルラー通信で使用する場合にＣＵＥ３Ａとして機能し、Ｄ２Ｄ通信で使用する場合にＤＵＥ３Ｂとして機能する。無線システム１では、ＣＵＥ３Ａ及びＤＵＥ３Ｂが使用可能な共存できる環境下にあるものとする。 FIG. 1 is an explanatory diagram illustrating an example of the wireless system according to the first embodiment. The radio system 1 illustrated in FIG. 1 includes an eNB 2 and a plurality of UEs (User Equipment) 3. The UE 3 has a function capable of executing switchable first communication such as cellular communication or second communication such as D2D communication.
The UE3 functions as the CUE3A when used in the cellular communication and functions as the DUE3B when used in the D2D communication. In the wireless system 1, it is assumed that the CUE 3A and the DUE 3B are in a coexisting environment in which they can be used.

図２は、実施例１のｅＮＢ２の一例を示すブロック図である。図２に示すｅＮＢ２は、アンテナ１１と、ＲＦ(Radio Frequency)回路１２と、メモリ１３と、プロセッサ１４と
を有する。アンテナ１１は、セルラー通信又はＤ２Ｄ通信の無線信号を送受信する。ＲＦ回路１２は、アンテナ１１で送受信する無線信号に対して各種信号処理を施す回路である。メモリ１３は、各種情報を記憶する領域である。プロセッサ１４は、ｅＮＢ２全体を制御する。 FIG. 2 is a block diagram illustrating an example of the eNB 2 according to the first embodiment. The eNB 2 illustrated in FIG. 2 includes an antenna 11, an RF (Radio Frequency) circuit 12, a memory 13, and a processor 14. The antenna 11 transmits and receives radio signals for cellular communication or D2D communication. The RF circuit 12 is a circuit that performs various kinds of signal processing on radio signals transmitted and received by the antenna 11. The memory 13 is an area for storing various information. The processor 14 controls the entire eNB2.

ＲＦ回路１２は、切替部２１と、受信部２２と、送信部２３とを有する。切替部２１は、アンテナ１１との間で受信部２２及び送信部２３を切替えるスイッチである。受信部２２は、セルラー通信又はＤ２Ｄ通信の無線信号を受信する通信インタフェースである。送信部２３は、セルラー通信又はＤ２Ｄ通信の無線信号を送信する通信インタフェースである。メモリ１３は、セルラー通信又はＤ２Ｄ通信に関わる使用周波数等の無線リソースを記憶すると共に、例えば、ＵＥ３毎に割り当てる、使用周波数等の無線リソースを管理する割当情報を記憶している。 The RF circuit 12 includes a switching unit 21, a receiving unit 22, and a transmitting unit 23. The switching unit 21 is a switch that switches between the receiving unit 22 and the transmitting unit 23 with the antenna 11. The reception unit 22 is a communication interface that receives a wireless signal of cellular communication or D2D communication. The transmission unit 23 is a communication interface that transmits a wireless signal for cellular communication or D2D communication. The memory 13 stores radio resources such as used frequencies related to cellular communication or D2D communication, and also stores allocation information for managing radio resources such as used frequencies, which is allocated to each UE 3, for example.

プロセッサ１４は、推定部３１と、データ信号復号部３２と、制御信号復号部３３と、品質算出部３４と、スケジューラ３５とを有する。更に、プロセッサ１４は、データ信号生成部３６と、制御信号生成部３７と、ＲＳ生成部３８と、データ信号符号化部３９と、
制御信号符号化部４０と、割当部４１とを有する。 The processor 14 includes an estimation unit 31, a data signal decoding unit 32, a control signal decoding unit 33, a quality calculation unit 34, and a scheduler 35. Further, the processor 14 includes a data signal generation unit 36, a control signal generation unit 37, an RS generation unit 38, a data signal encoding unit 39,
The control signal encoding unit 40 and the allocation unit 41 are included.

推定部３１は、受信信号内に挿入されたＲＳ(Reference Signal)信号に基づき、受信信号のチャネル状態から使用するチャネルのチャネル推定値を推定する。データ信号復号部３２は、チャネル推定値に基づき、受信信号からデータ信号を復調して復号化する。制御信号復号部３３は、チャネル推定値に基づき、受信信号から、例えばＤＣＩ（Downlink Control Information）フォーマット等の制御信号を復調して復号化する。尚、ＤＣＩフォーマットは、ＤＬ（Down Link）の制御コマンドである。 The estimation unit 31 estimates the channel estimation value of the channel to be used from the channel state of the received signal based on the RS (Reference Signal) signal inserted in the received signal. The data signal decoding unit 32 demodulates and decodes the data signal from the received signal based on the channel estimation value. The control signal decoding unit 33 demodulates and decodes a control signal in a DCI (Downlink Control Information) format or the like from the received signal based on the channel estimation value. The DCI format is a DL (Down Link) control command.

品質算出部３４は、チャネル推定値から受信品質を算出する。スケジューラ３５は、品質算出部の受信品質、データ信号復号部３２の復号結果、制御信号復号部３３の復号結果に基づき、収容するＵＥ３にセルラー通信やＤ２Ｄ通信に使用する無線リソースを割り当てる割当情報を生成する。そして、スケジューラ３５は、生成した割当情報をメモリ１３に記憶する。 The quality calculator 34 calculates the reception quality from the channel estimation value. Based on the reception quality of the quality calculation unit, the decoding result of the data signal decoding unit 32, and the decoding result of the control signal decoding unit 33, the scheduler 35 allocates allocation information that allocates radio resources used for cellular communication and D2D communication to the UE 3 to be accommodated. To generate. Then, the scheduler 35 stores the generated allocation information in the memory 13.

データ信号生成部３６は、要求に応じてデータ信号を生成する。制御信号生成部３７は、データ信号の復号結果、制御信号の復号結果や受信品質に基づき、制御信号を生成する。また、制御信号生成部３７は、要求に応じて制御信号の内容を編集する。ＲＳ生成部３８は、要求に応じてＲＳ信号を生成する。データ信号符号化部３９は、データ信号生成部３６で生成したデータ信号を符号化して変調する。制御信号符号化部４０は、生成した制御信号を符号化して変調する。割当部４１は、割当情報に基づき、データ信号、制御信号やＲＳ信号に無線リソースを割り当てる。また、制御信号生成部３７は、スケジューラ３５で生成した割当情報をＤＣＩフォーマットに載せ、ＤＣＩフォーマットをＵＥ３に送信する。 The data signal generator 36 generates a data signal in response to a request. The control signal generation unit 37 generates a control signal based on the decoding result of the data signal, the decoding result of the control signal, and the reception quality. Further, the control signal generation unit 37 edits the content of the control signal in response to the request. The RS generator 38 generates an RS signal in response to the request. The data signal encoder 39 encodes and modulates the data signal generated by the data signal generator 36. The control signal coding unit 40 codes and modulates the generated control signal. The allocation unit 41 allocates radio resources to data signals, control signals and RS signals based on the allocation information. Further, the control signal generation unit 37 puts the allocation information generated by the scheduler 35 on the DCI format and transmits the DCI format to the UE3.

スケジューラ３５は、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースを共用しているか否かを判定する。スケジューラ３５は、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースを共用している場合、制御対象のＤＵＥ３Ｂの制御フラグをＯＮに設定する。スケジューラ３５は、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースを共用していない場合、制御対象のＤＵＥ３Ｂの制御フラグをＯＦＦに設定する。制御信号生成部３７は、例えば、ＵＬグラント毎に、ＵＬグラントを格納するＤＣＩフォーマットを生成する。尚、ＵＬグラントは、例えば、Ｄ２Ｄ通信の通信を許可する際の制御信号である。そして、制御信号生成部３７は、ＤＣＩフォーマットに、制御対象のＤＵＥ３Ｂの制御フラグを付加し、制御フラグを付加したＤＣＩフォーマットを送信部２３からＵＬグラントのＵＥ３に送信する。 The scheduler 35 determines whether the DUE 3B to be controlled shares the same radio resource as the CUE 3A. When the DUE 3B to be controlled shares the same radio resource as the CUE 3A, the scheduler 35 sets the control flag of the DUE 3B to be controlled to ON. When the DUE 3B to be controlled does not share the same radio resource as the CUE 3A, the scheduler 35 sets the control flag of the DUE 3B to be controlled to OFF. The control signal generation unit 37 generates, for example, for each UL grant, a DCI format that stores the UL grant. The UL grant is, for example, a control signal for permitting D2D communication. Then, the control signal generation unit 37 adds the control flag of the DUE 3B to be controlled to the DCI format, and transmits the DCI format with the control flag added from the transmission unit 23 to the UE 3 of the UL grant.

図３は、ＵＥ３の一例を示すブロック図である。図３に示すＵＥ３は、アンテナ５１と、ＲＦ回路５２と、メモリ５３と、プロセッサ５４とを有する。アンテナ５１は、セルラー通信又はＤ２Ｄ通信の無線信号を送受信する。ＲＦ回路５２は、無線信号に対して各種信号処理を施す回路である。メモリ５３は、ｅＮＢ２からの割当情報等の各種情報を記憶する領域である。プロセッサ５４は、ＵＥ３全体を制御する。 FIG. 3 is a block diagram showing an example of the UE 3. The UE 3 illustrated in FIG. 3 includes an antenna 51, an RF circuit 52, a memory 53, and a processor 54. The antenna 51 transmits and receives radio signals for cellular communication or D2D communication. The RF circuit 52 is a circuit that performs various kinds of signal processing on wireless signals. The memory 53 is an area for storing various information such as allocation information from the eNB 2. The processor 54 controls the UE 3 as a whole.

ＲＦ回路５２は、切替部６１と、受信部６２と、送信部６３とを有する。切替部６１は、アンテナ５１との間で受信部６２及び送信部６３を切替えるスイッチである。受信部６２は、セルラー通信又はＤ２Ｄ通信の無線信号を受信する通信インタフェースである。送信部６３は、セルラー通信又はＤ２Ｄ通信の無線信号を送信する通信インタフェースである。 The RF circuit 52 has a switching unit 61, a receiving unit 62, and a transmitting unit 63. The switching unit 61 is a switch that switches between the receiving unit 62 and the transmitting unit 63 with the antenna 51. The reception unit 62 is a communication interface that receives a wireless signal of cellular communication or D2D communication. The transmission unit 63 is a communication interface that transmits a radio signal for cellular communication or D2D communication.

プロセッサ５４は、推定部７１と、データ信号復号部７２と、制御信号復号部７３と、品質算出部７４と、データ信号生成部７５と、制御信号生成部７６と、ＲＳ生成部７７と
を有する。更に、プロセッサ５４は、データ信号符号化部７８と、制御信号符号化部７９と、割当部８０と、通信制御部８１とを有する。推定部７１は、受信信号内に挿入されたＲＳ信号に基づきチャネル推定値を推定する。データ信号復号部７２は、チャネル推定値に基づき、受信信号からデータ信号を復調して復号化する。制御信号復号部７３は、受信信号から制御信号を復調して復号化する。 The processor 54 includes an estimation unit 71, a data signal decoding unit 72, a control signal decoding unit 73, a quality calculation unit 74, a data signal generation unit 75, a control signal generation unit 76, and an RS generation unit 77. .. Further, the processor 54 has a data signal coding unit 78, a control signal coding unit 79, an allocation unit 80, and a communication control unit 81. The estimation unit 71 estimates a channel estimation value based on the RS signal inserted in the received signal. The data signal decoding unit 72 demodulates and decodes the data signal from the received signal based on the channel estimation value. The control signal decoding unit 73 demodulates and demodulates the control signal from the received signal.

品質算出部７４は、チャネル推定値から受信品質を算出する。データ信号生成部７５は、要求に応じてデータ信号を生成する。制御信号生成部７６は、データ信号の復号結果、制御信号の復号結果や受信品質に基づき、制御信号を生成する。ＲＳ生成部７７は、ＲＳ信号を生成する。データ信号符号化部７８は、データ信号を符号化して変調する。制御信号符号化部７９は、制御信号を符号化して変調する。割当部８０は、ｅＮＢ２からの割当情報に基づき、データ信号、制御信号やＲＳ信号に無線リソースを割り当て、データ信号、制御信号やＲＳ信号を送信部６３に伝送する。 The quality calculator 74 calculates the reception quality from the channel estimation value. The data signal generator 75 generates a data signal in response to the request. The control signal generation unit 76 generates a control signal based on the decoding result of the data signal, the decoding result of the control signal, and the reception quality. The RS generator 77 generates an RS signal. The data signal encoder 78 encodes and modulates the data signal. The control signal coding unit 79 codes and modulates the control signal. The allocation unit 80 allocates radio resources to the data signal, the control signal and the RS signal based on the allocation information from the eNB 2, and transmits the data signal, the control signal and the RS signal to the transmission unit 63.

通信制御部８１は、制御信号復号化部７３でｅＮＢ２からの制御信号を復号化し、制御信号のＤＣＩフォーマットに付加した自分宛の制御フラグがＯＮであるか否かを判定する。通信制御部８１は、制御フラグがＯＮの場合、送信部６３の送信電力を制御する。 The communication control unit 81 decodes the control signal from the eNB 2 by the control signal decoding unit 73, and determines whether the control flag for itself, which is added to the DCI format of the control signal, is ON. The communication control unit 81 controls the transmission power of the transmission unit 63 when the control flag is ON.

通信制御部８１は、Ｄ２Ｄ通信のＯＬ−ＴＰＣの（数１）を用いて、Ｄ２Ｄ通信の送信電力量Ｐｄを仮の送信電力量として算出する（３ＧＰＰＴＳ３６．２１３ｖ１２．１．
０参照）。 The communication control unit 81 calculates the transmission power amount Pd of the D2D communication as the provisional transmission power amount by using (Equation 1) of the OL-TPC of the D2D communication (3GPPTS36.213 v12.1.
0).

更に、通信制御部８１は、ｅＮＢ２とのパスロスＰＬｃを算出する。尚、パスロスＰＬｃは、ＲＳ信号の送信電力量から、上位レイヤのフィルタを掛けたＲＳＲＰ（Reference Signal Received Power）を差し引くことで算出する。ＲＳ信号の送信電力量は、ｅＮＢ
２からＵＥ３に上位レイヤで通知されるものである。通信制御部８１は、（Ｐｄ−ＰＬｃ）でｅＮＢ２側のＤＵＥ３Ｂの予想受信電力量を算出する。更に、通信制御部８１は、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下であるか否かを判定する。尚、閾値Ｔｈは、ｅＮＢ２とＵＥ３との間でＣＵＥ３ＡのＵＬ信号に信号干渉しない程度の送信電力量に相当し、事前に算出しておくものとする。 Furthermore, the communication control unit 81 calculates the path loss PLc with the eNB2. The path loss PLc is calculated by subtracting RSRP (Reference Signal Received Power) obtained by filtering the upper layer from the transmission power amount of the RS signal. The transmission power of RS signal is eNB
2 to UE3 from the upper layer. The communication control unit 81 calculates the expected received power amount of the DUE 3B on the eNB2 side in (Pd-PLc). Furthermore, the communication control unit 81 determines whether or not the predicted received power amount (Pd-PLc) is less than or equal to the threshold Th. The threshold Th corresponds to an amount of transmission power between the eNB 2 and the UE 3 that does not cause signal interference with the UL signal of the CUE 3A, and is calculated in advance.

通信制御部８１は、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、算出した送信電力量Ｐｄを低減する必要はなく、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、送信部６３の送信電力を制御する。また、通信制御部８１は、予想受信電力量（Ｐｄ−ＰＬ
ｃ）が閾値Ｔｈ以下でない場合、Ｄ２Ｄ通信の送信電力量を閾値Ｔｈに設定すべく、送信部６３の送信電力を制御する。通信制御部８１は、制御フラグがＯＮでない場合、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、送信部６３の送信電力を制御する。 When the expected received power amount (Pd-PLc) is equal to or less than the threshold Th, the communication control unit 81 does not need to reduce the calculated transmission power amount Pd, and the transmission unit 81 sets the transmission power amount for D2D communication to Pd. The transmission power of 63 is controlled. In addition, the communication control unit 81 uses the estimated received power amount (Pd-PL
When c) is not less than or equal to the threshold Th, the transmission power of the transmission unit 63 is controlled so that the transmission power amount of D2D communication is set to the threshold Th. When the control flag is not ON, the communication control unit 81 controls the transmission power of the transmission unit 63 to set the transmission power amount of D2D communication to Pd.

図４は、制御フラグを付加するＤＣＩフォーマットの一例を示す説明図である。尚、ＤＣＩフォーマットは、例えば、DCI format“0”である。図４に示すＤＣＩフォーマット
９０は、Carrier Indicator（０又は３ビット）９１、Flag for format0/format1A differentiation（１ビット）９２、Frequency hopping flag（１ビット）９３を有する。ＤＣＩフォーマット９０は、Resource block assignment and hopping resource allocation
（最大１２ビット）９４、Modulation and coding scheme and redundancy version（５
ビット）９５、New data indicator（１ビット）９６を有する。更に、ＤＣＩフォーマット９０は、TPC command for scheduled PUSCH（２ビット）９７、Cyclic shift for DM RS and OCC index（３ビット）９８、UL index（２ビット）９９、Downlink Assignment Index (DAI)（２ビット）１００を有する。更に、ＤＣＩフォーマット９０は、CSI requests（１又は２ビット）１０１及びResource allocation type（１ビット）１０２を有する。制御信号生成部７６は、ＤＣＩフォーマット９０を生成し、ＤＣＩフォーマット９０に、制御対象のＵＥ３の個数分の制御フラグ１０３を付加する。 FIG. 4 is an explanatory diagram showing an example of a DCI format to which a control flag is added. The DCI format is, for example, DCI format “0”. The DCI format 90 shown in FIG. 4 has a Carrier Indicator (0 or 3 bits) 91, a Flag for format0 / format1A differentiation (1 bit) 92, and a Frequency hopping flag (1 bit) 93. The DCI format 90 is a resource block assignment and hopping resource allocation.
(Maximum 12 bits) 94, Modulation and coding scheme and redundancy version (5
Bit) 95 and New data indicator (1 bit) 96. Further, the DCI format 90 includes a TPC command for scheduled PUSCH (2 bits) 97, a Cyclic shift for DM RS and OCC index (3 bits) 98, a UL index (2 bits) 99, a Downlink Assignment Index (DAI) (2 bits). Has 100. Further, the DCI format 90 has CSI requests (1 or 2 bits) 101 and Resource allocation type (1 bit) 102. The control signal generation unit 76 generates the DCI format 90, and adds the control flags 103 for the number of UEs 3 to be controlled to the DCI format 90.

次に実施例１の無線システム１の動作について説明する。ｅＮＢ２のスケジューラ３５は、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースを共用しているか否かを判定し、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースを共用している場合に、制御対象のＤＵＥ３Ｂの制御フラグをＯＮに設定する。また、スケジューラ３５は、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースを共用していない場合に、制御対象のＤＵＥ３Ｂの制御フラグをＯＦＦに設定する。そして、制御信号生成部７６は、例えば、Ｄ２Ｄ通信を許可するＵＬグラント毎に、当該ＵＬグラントを格納するＤＣＩフォーマットを生成し、生成したＤＣＩフォーマットに制御対象のＤＵＥ３Ｂの制御フラグを付加する。そして、送信部２３は、制御フラグを付加したＤＣＩフォーマットを制御対象のＤＵＥ３Ｂに送信する。 Next, the operation of the wireless system 1 according to the first embodiment will be described. The scheduler 35 of the eNB 2 determines whether or not the control target DUE 3B shares the same radio resource as the CUE 3A, and when the control target DUE 3B shares the same radio resource as the CUE 3A, The control flag of DUE3B is set to ON. Moreover, the scheduler 35 sets the control flag of the DUE 3B to be controlled to OFF when the DUE 3B to be controlled does not share the same radio resource as the CUE 3A. Then, the control signal generation unit 76 generates, for example, for each UL grant that permits D2D communication, a DCI format that stores the UL grant, and adds the control flag of the DUE 3B to be controlled to the generated DCI format. Then, the transmission unit 23 transmits the DCI format with the control flag added to the DUE 3B to be controlled.

図５は、実施例１の通信制御処理に関わるＤＵＥ３Ｂの処理動作の一例を示すフローチャートである。図５に示す通信制御処理は、自分宛の制御フラグに基づきＤ２Ｄ通信の送信電力を制御するＤＵＥ３Ｂ側の処理である。 FIG. 5 is a flowchart illustrating an example of the processing operation of the DUE 3B related to the communication control processing of the first embodiment. The communication control process illustrated in FIG. 5 is a process on the DUE3B side that controls the transmission power of D2D communication based on the control flag addressed to itself.

図５においてＤＵＥ３Ｂの通信制御部８１は、Ｄ２Ｄ通信の送信電力量Ｐｄを算出し（ステップＳ１１）、受信したＤＣＩフォーマット９０に付加された自分宛の制御フラグ１０３がＯＮであるか否かを判定する（ステップＳ１２）。通信制御部８１は、自分宛の制御フラグ１０３がＯＮの場合（ステップＳ１２肯定）、ｅＮＢ２とのパスロスＰＬｃを算出する（ステップＳ１３）。 In FIG. 5, the communication control unit 81 of the DUE 3B calculates the transmission power amount Pd of D2D communication (step S11), and determines whether or not the control flag 103 addressed to itself, which is added to the received DCI format 90, is ON. Yes (step S12). When the control flag 103 addressed to itself is ON (Yes at Step S12), the communication control unit 81 calculates the path loss PLc with the eNB2 (Step S13).

通信制御部８１は、Ｄ２Ｄ通信の送信電力量ＰｄからパスロスＰＬｃを差し引いたｅＮＢ２側の予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下であるか否かを判定する（ステップＳ１４）。通信制御部８１は、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合（ステップＳ１４肯定）、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、送信部６３内の送信電力を制御してＤ２Ｄ通信を実行し（ステップＳ１５）、図５に示す処理動作を終了する。 The communication control unit 81 determines whether or not the expected received power amount (Pd-PLc) on the eNB2 side obtained by subtracting the path loss PLc from the transmission power amount Pd of D2D communication is equal to or less than the threshold Th (step S14). When the expected received power amount (Pd-PLc) is less than or equal to the threshold Th (Yes in step S14), the communication control unit 81 controls the transmission power in the transmission unit 63 so as to set the transmission power amount of D2D communication to Pd. Then, the D2D communication is executed (step S15), and the processing operation shown in FIG. 5 ends.

通信制御部８１は、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下でない場合（ステップＳ１４否定）、Ｄ２Ｄ通信による信号干渉の影響があると判断する。そして、通信制御部８１は、Ｄ２Ｄ通信の送信電力量を閾値Ｔｈに設定すべく、送信部６３内の送信電力を制御してＤ２Ｄ通信を実行し（ステップＳ１６）、図５に示す処理動作を終了する。 When the predicted received power amount (Pd-PLc) is not equal to or less than the threshold Th (No in step S14), the communication control unit 81 determines that there is an influence of signal interference due to D2D communication. Then, the communication control unit 81 controls the transmission power in the transmission unit 63 to execute the D2D communication in order to set the transmission power amount of the D2D communication to the threshold Th (step S16), and performs the processing operation illustrated in FIG. finish.

通信制御部８１は、自分宛の制御フラグ１０３がＯＮでない場合（ステップＳ１２否定）、Ｄ２Ｄ通信による信号干渉の影響がないと判断する。そして、通信制御部８１は、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、送信部６３内の送信電力を制御してＤ２Ｄ通信を実行し（ステップＳ１７）、図５に示す処理動作を終了する。つまり、ＤＵＥ３Ｂは、対向するＤＵＥ３Ｂとの間でＴＰＣ（Transmission Power Control）を実行することでＤ２Ｄ通信を実現する。 When the control flag 103 addressed to itself is not ON (No at Step S12), the communication control unit 81 determines that there is no influence of signal interference due to D2D communication. Then, the communication control unit 81 controls the transmission power in the transmission unit 63 to execute the D2D communication in order to set the transmission power amount of the D2D communication to Pd (step S17), and ends the processing operation shown in FIG. To do. That is, the DUE 3B realizes D2D communication by executing TPC (Transmission Power Control) between the DUE 3B and the opposite DUE 3B.

図５に示す通信制御処理を実行するＤＵＥ３Ｂは、制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、送信電力量をＰｄに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 When the control flag 103 is ON and the expected received power amount (Pd-PLc) is less than or equal to the threshold Th, the DUE 3B that executes the communication control process illustrated in FIG. 5 sets the transmission power amount to Pd so as to set the transmission power amount to Pd. Control the transmission power of. As a result, it is possible to reduce the signal interference of the UL signal to the CUE3A due to the D2D communication.

ＤＵＥ３Ｂは、制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下でない場合、送信電力量を閾値Ｔｈに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 When the control flag 103 is ON and the predicted received power amount (Pd-PLc) is not equal to or less than the threshold Th, the DUE 3B controls the transmission power of the transmission unit 63 to set the transmission power amount to the threshold Th. As a result, it is possible to reduce the signal interference of the UL signal to the CUE3A due to the D2D communication.

ＤＵＥ３Ｂは、制御フラグ１０３がＯＦＦの場合、送信電力量をＰｄに設定すべく、送信部６３の送信出力を制御する。 When the control flag 103 is OFF, the DUE 3B controls the transmission output of the transmitter 63 to set the transmission power amount to Pd.

実施例１のｅＮＢ２は、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースを共用している場合、制御対象のＤＵＥ３Ｂの制御フラグ１０３をＯＮに設定する。また、ｅＮＢ２は、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースを共用していない場合、制御対象のＤＵＥ３Ｂの制御フラグ１０３をＯＦＦに設定する。ｅＮＢ２は、制御対象のＤＵＥ３Ｂの個数分の制御フラグ１０３をＤＣＩフォーマット９０に付加して制御対象のＤＵＥ３Ｂに通知する。その結果、ＤＵＥ３Ｂは、自分宛の制御フラグ１０３がＯＮの場合、Ｄ２Ｄ通信の送信電力を制御することで、Ｄ２Ｄ通信によるセルラー通信への信号干渉を低減できる。 The eNB 2 of the first embodiment sets the control flag 103 of the control target DUE 3B to ON when the control target DUE 3B shares the same radio resource as the CUE 3A. Moreover, eNB2 sets the control flag 103 of DUE3B of a control object to OFF, when DUE3B of a control object does not share the same radio resource as CUE3A. The eNB 2 adds the control flags 103 corresponding to the number of DUE 3B to be controlled to the DCI format 90 and notifies the DUE 3B to be controlled. As a result, when the control flag 103 addressed to itself is ON, the DUE 3B can reduce the signal interference to the cellular communication by the D2D communication by controlling the transmission power of the D2D communication.

更に、ＤＵＥ３Ｂは、制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡのＵＬ信号への信号干渉を低減できる。 Further, when the control flag 103 is ON and the expected received power amount (Pd-PLc) is less than or equal to the threshold Th, the DUE 3B controls the transmission power of the transmission unit 63 to set the transmission power amount of D2D communication to Pd. To do. As a result, it is possible to reduce signal interference with the UL signal of CUE3A due to D2D communication.

ＤＵＥ３Ｂは、制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下でない場合、Ｄ２Ｄ通信の送信電力量を閾値Ｔｈに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡのＵＬ信号への信号干渉を低減できる。 When the control flag 103 is ON and the predicted received power amount (Pd-PLc) is not less than or equal to the threshold Th, the DUE 3B controls the transmission power of the transmission unit 63 to set the transmission power amount of D2D communication to the threshold Th. .. As a result, it is possible to reduce signal interference with the UL signal of CUE3A due to D2D communication.

実施例１では、ＣＵＥ３Ａ及びＤＵＥ３Ｂが同一の無線リソースを共用できるため、無線リソースの使用効率を高めることができる。 In the first embodiment, since the CUE 3A and the DUE 3B can share the same radio resource, it is possible to improve the use efficiency of the radio resource.

実施例１では、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースを共用している場合に、パスロスＰＬｃを考慮した予想受信電力量に基づく送信電力制御を実行するため、ＯＬ−ＴＰＣを採用した場合に比較して不要な送信電力制御の頻度を低減できる。尚、ＯＬ−ＴＰＣ（Open Loop Transmission Power Control）は、ＣＵＥ３Ａへの信号干渉がない環境下でも、常時、送信電力制御を行うため、Ｄ２Ｄ通信のスループットが低下する。 In the first embodiment, when the DUE 3B to be controlled shares the same radio resource as the CUE 3A, the transmission power control based on the predicted received power amount considering the path loss PLc is executed, and thus the case where the OL-TPC is adopted. The frequency of unnecessary transmission power control can be reduced as compared with. Note that the OL-TPC (Open Loop Transmission Power Control) always controls the transmission power even in an environment where there is no signal interference with the CUE 3A, and thus the throughput of D2D communication is reduced.

しかも、実施例１では、無線リソースのスケジュール状況が刻々変動する場合でも、不
必要にＤ２Ｄ通信の送信電力を低下することなく、状況に応じてＤ２Ｄ通信によるセルラー通信への信号干渉を低減できる。 Moreover, in the first embodiment, even when the schedule condition of the radio resource changes every moment, it is possible to reduce the signal interference to the cellular communication by the D2D communication according to the condition without unnecessarily lowering the transmission power of the D2D communication.

尚、上記実施例１のｅＮＢ２は、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースと共用しているか否かで制御フラグ１０３をＯＮ／ＯＦＦしたが、ＤＵＥ３ＢがｅＮＢ２に隣接しているか否かで制御フラグ１０３をＯＮ／ＯＦＦするようにしても良い。そこで、この場合の実施の形態につき、実施例２として以下に説明する。 The eNB2 of the first embodiment turns the control flag 103 ON / OFF depending on whether the DUE3B to be controlled shares the same radio resource as the CUE3A. However, depending on whether the DUE3B is adjacent to the eNB2. The control flag 103 may be turned ON / OFF. Therefore, an embodiment in this case will be described below as a second embodiment.

図６は、実施例２のｅＮＢ２Ａの一例を示すブロック図である。尚、実施例１の無線システム１と同一の構成には同一符号を付すことで、その重複する構成及び動作の説明については省略する。図６に示すｅＮＢ２Ａと図２に示すｅＮＢ２とが異なるところは、位置判定部４２を追加した点にある。位置判定部４２は、ＤＵＥ３Ｂ及びｅＮＢ２Ａの位置情報に基づき、ＤＵＥ３ＢがｅＮＢ２Ａに隣接しているか否かを判定する。スケジューラ３５は、位置判定部４２でＤＵＥ３ＢがｅＮＢ２Ａに隣接している場合に、当該ＤＵＥ３Ｂの制御フラグ１０３をＯＮに設定する。 FIG. 6 is a block diagram illustrating an example of the eNB 2A according to the second embodiment. The same components as those of the wireless system 1 according to the first embodiment are designated by the same reference numerals, and the description of the overlapping components and operations will be omitted. The eNB 2A shown in FIG. 6 is different from the eNB 2 shown in FIG. 2 in that the position determination unit 42 is added. The position determination unit 42 determines whether or not the DUE 3B is adjacent to the eNB 2A based on the position information of the DUE 3B and the eNB 2A. When the DUE 3B is adjacent to the eNB 2A in the position determination unit 42, the scheduler 35 sets the control flag 103 of the DUE 3B to ON.

図７は、位置判定部４２の一例を示す説明図である。位置判定部４２は、位置比較部４２Ａと、品質比較部４２Ｂとを有する。位置比較部４２Ａは、Ｄ２Ｄ通信のＤＵＥ３Ｂの位置情報と、ｅＮＢ２Ａの位置情報とを比較し、その距離が所定距離内の場合、ＤＵＥ３ＢとｅＮＢ２Ａとが隣接していると判断する。品質比較部４２Ｂは、例えば、パスロスやＲＳＲＰ(Reference Signal Received Power)等のＤ２Ｄ通信の受信品質と、品質閾値と
を比較し、受信品質が品質閾値を超えた場合にＤＵＥ３ＢとｅＮＢ２Ａとが隣接していると判断する。 FIG. 7 is an explanatory diagram showing an example of the position determination unit 42. The position determination unit 42 has a position comparison unit 42A and a quality comparison unit 42B. The position comparison unit 42A compares the position information of the DUE3B of the D2D communication with the position information of the eNB2A, and when the distance is within a predetermined distance, determines that the DUE3B and the eNB2A are adjacent to each other. The quality comparing unit 42B compares, for example, the reception quality of D2D communication such as path loss or RSRP (Reference Signal Received Power) with the quality threshold, and when the reception quality exceeds the quality threshold, the DUE3B and the eNB2A are adjacent to each other. Determine that

スケジューラ３５は、位置判定部４２でＤＵＥ３ＢがｅＮＢ２Ａに隣接していると判定した場合、該当ＤＵＥ３Ｂの制御フラグ１０３をＯＮに設定する。スケジューラ３５は、位置判定部４２でＤＵＥ３ＢがｅＮＢ２Ａに隣接していないと判定した場合、該当ＤＵＥ３Ｂの制御フラグ１０３をＯＦＦに設定する。そして、制御信号生成部７６は、ＤＣＩフォーマット９０に制御対象のＤＵＥ３Ｂの個数分の制御フラグ１０３を付加する。そして、送信部２３は、制御フラグ１０３を付加したＤＣＩフォーマット９０を制御対象のＤＵＥ３Ｂに送信する。 When the scheduler 35 determines that the DUE 3B is adjacent to the eNB 2A by the position determination unit 42, the scheduler 35 sets the control flag 103 of the corresponding DUE 3B to ON. When the scheduler 35 determines that the DUE 3B is not adjacent to the eNB 2A by the position determination unit 42, the scheduler 35 sets the control flag 103 of the corresponding DUE 3B to OFF. Then, the control signal generation unit 76 adds to the DCI format 90 the control flags 103 corresponding to the number of DUEs 3B to be controlled. Then, the transmission unit 23 transmits the DCI format 90 added with the control flag 103 to the DUE 3B to be controlled.

ＤＵＥ３Ｂは、制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 When the control flag 103 is ON and the predicted received power amount (Pd-PLc) is equal to or less than the threshold Th, the DUE 3B controls the transmission power of the transmission unit 63 to set the transmission power amount of D2D communication to Pd. As a result, it is possible to reduce the signal interference of the UL signal to the CUE3A due to the D2D communication.

ＤＵＥ３Ｂは、制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下でない場合、Ｄ２Ｄ通信の送信電力量を閾値Ｔｈに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 When the control flag 103 is ON and the predicted received power amount (Pd-PLc) is not less than or equal to the threshold Th, the DUE 3B controls the transmission power of the transmission unit 63 to set the transmission power amount of D2D communication to the threshold Th. .. As a result, it is possible to reduce the signal interference of the UL signal to the CUE3A due to the D2D communication.

実施例２のｅＮＢ２Ａは、ＤＵＥ３ＢがｅＮＢ２Ａに隣接している場合、制御対象のＤＵＥ３Ｂの制御フラグ１０３をＯＮに設定し、ＤＵＥ３ＢがｅＮＢ２Ａに隣接していない場合、制御対象のＤＵＥ３Ｂの制御フラグ１０３をＯＦＦに設定する。ｅＮＢ２Ａは、制御対象のＤＵＥ３Ｂの個数分の制御フラグ１０３をＤＣＩフォーマット９０に付加して制御対象のＤＵＥ３Ｂに通知する。その結果、ＤＵＥ３Ｂは、自分宛の制御フラグ１０３がＯＮの場合、Ｄ２Ｄ通信の送信電力を制御することで、Ｄ２Ｄ通信によるセルラー通信への信号干渉を低減できる。 When the DUE3B is adjacent to the eNB2A, the eNB2A of the second embodiment sets the control flag 103 of the control target DUE3B to ON, and when the DUE3B is not adjacent to the eNB2A, sets the control flag 103 of the control target DUE3B. Set to OFF. The eNB 2A adds the control flags 103 corresponding to the number of DUEs 3B to be controlled to the DCI format 90 and notifies the DUE 3B to be controlled. As a result, the DUE 3B can reduce the signal interference to the cellular communication by the D2D communication by controlling the transmission power of the D2D communication when the control flag 103 addressed to itself is ON.

更に、ＤＵＥ３Ｂは、制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、送信部６３の送信電力を制御する。その結果、ＤＵＥ３ＢがｅＮＢ２Ａに隣接した場合でも、Ｄ２Ｄ通信によるＣＵＥ３ＡのＵＬ信号への信号干渉を低減できる。 Further, when the control flag 103 is ON and the expected received power amount (Pd-PLc) is less than or equal to the threshold Th, the DUE 3B controls the transmission power of the transmission unit 63 to set the transmission power amount of D2D communication to Pd. To do. As a result, even when the DUE 3B is adjacent to the eNB 2A, it is possible to reduce signal interference with the UL signal of the CUE 3A due to the D2D communication.

ＤＵＥ３Ｂは、制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下でない場合、Ｄ２Ｄ通信の送信電力量を閾値Ｔｈに設定すべく、送信部６３の送信電力を制御する。その結果、ＤＵＥ３ＢがｅＮＢ２Ａに隣接した場合でも、Ｄ２Ｄ通信によるＣＵＥ３ＡのＵＬ信号への信号干渉を低減できる。 When the control flag 103 is ON and the predicted received power amount (Pd-PLc) is not less than or equal to the threshold Th, the DUE 3B controls the transmission power of the transmission unit 63 to set the transmission power amount of D2D communication to the threshold Th. .. As a result, even when the DUE 3B is adjacent to the eNB 2A, it is possible to reduce signal interference with the UL signal of the CUE 3A due to the D2D communication.

例えば、ＤＵＥ３Ｂ同士でＤ２Ｄ通信の送信電力を低減した場合でも、セルエリア端付近のＣＵＥ３ＡからＵＬ信号がｅＮＢ２Ａに到達する時点の受信レベルが低く、Ｄ２Ｄ通信の影響を受ける可能性がある。そこで、実施例２では、ＤＵＥ３ＡがｅＮＢ２Ａに隣接した場合でも、Ｄ２Ｄ通信の送信電力を低減するようにしたので、Ｄ２Ｄ通信によるＣＵＥ３ＡのＵＬ信号への信号干渉を低減できる。 For example, even when the transmission power of the D2D communication is reduced between the DUEs 3B, the reception level at the time when the UL signal from the CUE 3A near the cell area edge reaches the eNB 2A is low, and the D2D communication may be affected. Therefore, in the second embodiment, even when the DUE 3A is adjacent to the eNB 2A, the transmission power of the D2D communication is reduced, so that the signal interference with the UL signal of the CUE 3A due to the D2D communication can be reduced.

また、上記実施例２では、位置判定部４２で制御対象のＤＵＥ３ＢがｅＮＢ２Ａに隣接しているか否かの隣接関係に基づき、制御対象のＤＵＥ３Ｂの制御フラグ１０３を設定した。しかしながら、隣接関係の他に、上記実施例１と同様に、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースを共用しているか否かの共用有無に基づき、制御対象のＤＵＥ３Ｂの制御フラグ１０３を設定しても良い。 Further, in the second embodiment, the position determination unit 42 sets the control flag 103 of the DUE 3B to be controlled based on the adjacency relation of whether or not the DUE 3B to be controlled is adjacent to the eNB 2A. However, in addition to the adjacency relationship, the control flag 103 of the control target DUE3B is set based on whether or not the control target DUE3B shares the same radio resource as the CUE3A, as in the first embodiment. You may.

尚、上記実施例１及び２では、ＤＣＩフォーマット９０に制御対象のＵＥ個数分の制御フラグ１０３を付加した。しかしながら、Ｄ２Ｄ通信では不要な制御情報、例えば、New data indicator９６等の代わりに制御フラグ１０３を割り当てるようにしても良い。尚、New data indicator９６は、例えば、ブロードキャスト送信時に再送しないなら不要となる制御情報である。 In the first and second embodiments, the DCI format 90 is added with the control flags 103 for the number of UEs to be controlled. However, control information unnecessary for D2D communication, for example, the control flag 103 may be assigned instead of the New data indicator 96 or the like. The New data indicator 96 is, for example, control information that is unnecessary if not retransmitted during broadcast transmission.

また、上記実施例１では、制御対象のＵＥ個数分の制御フラグ１０３をＤＣＩフォーマット９０に付加した。しかしながら、制御対象のＵＥ個数が増加すると、その分、ＤＣＩフォーマットに付加する制御フラグの個数も増えることになる。そこで、専用フォーマットに制御対象のＤＵＥ３Ｂ毎の制御フラグを配置し、専用フォーマット内のＣＲＣ（Cyclic Redundancy Check）を使用して自分宛の制御フラグがＤＵＥ３Ｂ側で識別できるよう
にしても良い。そこで、この場合の実施の形態につき、実施例３として以下に説明する。尚、上記実施例１の無線システム１と同一の構成には同一符号を付すことで、その重複する構成及び動作の説明については省略する。 Further, in the first embodiment, the control flags 103 for the number of UEs to be controlled are added to the DCI format 90. However, as the number of UEs to be controlled increases, the number of control flags added to the DCI format also increases accordingly. Therefore, a control flag for each DUE 3B to be controlled may be arranged in the dedicated format so that the control flag addressed to itself can be identified on the DUE 3B side using CRC (Cyclic Redundancy Check) in the dedicated format. Therefore, an embodiment in this case will be described below as a third embodiment. The same components as those of the wireless system 1 according to the first embodiment are designated by the same reference numerals, and the description of the overlapping components and operations will be omitted.

図８は、実施例３の制御フラグを付加する専用フォーマットの一例を示す説明図である。図８に示す専用フォーマット１１０は、制御対象のＤＵＥ３Ｂ毎に設定したビット単位の制御フラグ１１１と、自分宛の制御フラグ１１１を識別できるように設定したＣＲＣ１１２とを有する。 FIG. 8 is an explanatory diagram showing an example of a dedicated format for adding a control flag according to the third embodiment. The dedicated format 110 shown in FIG. 8 has a bit-wise control flag 111 set for each DUE 3B to be controlled, and a CRC 112 set so that the control flag 111 addressed to itself can be identified.

スケジューラ３５は、専用フォーマット１１０内に制御対象のＤＵＥ３Ｂの制御フラグ１１１を順次設定する。制御信号生成部３７は、専用フォーマット１１０内の制御対象のＤＵＥ３Ｂの制御フラグ１１１を識別可能にするＣＲＣ１１２を設定する。尚、ＣＲＣ１１２は、各ＤＵＥ３Ｂに割り当てられたＣ−ＲＮＴＩ（Cell-Radio Network Temporary Identifier）でスクランブル化されているため、自分宛の制御フラグ１１１が識別可能と
なる。制御信号生成部３７は、制御対象のＤＵＥ３Ｂの状態変化を検出すると、その都度
、制御対象のＤＵＥ３Ｂの制御フラグ１１１を専用フォーマット１１０内にダイナミックに設定する。そして、送信部２３は、専用フォーマット１１０を制御対象の各ＤＵＥ３Ｂに送信する。 The scheduler 35 sequentially sets the control flag 111 of the DUE 3B to be controlled in the dedicated format 110. The control signal generation unit 37 sets the CRC 112 that allows the control flag 111 of the DUE 3B to be controlled in the dedicated format 110 to be identified. Since the CRC 112 is scrambled with a C-RNTI (Cell-Radio Network Temporary Identifier) assigned to each DUE 3B, the control flag 111 addressed to itself can be identified. Whenever the control signal generation unit 37 detects a state change of the control target DUE 3B, the control signal generation unit 37 dynamically sets the control flag 111 of the control target DUE 3B in the dedicated format 110. Then, the transmission unit 23 transmits the dedicated format 110 to each DUE 3B to be controlled.

ＤＵＥ３Ｂは、専用フォーマット１１０を受信した場合、専用フォーマット１１０内のＣＲＣ１１２に基づき、自分宛の制御フラグ１１１を専用フォーマット１１０から得る。ＤＵＥ３Ｂは、自分宛の制御フラグ１１１がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、Ｄ２Ｄ通信の送信電力量がＰｄに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡのＵＬ信号への信号干渉を低減できる。 When receiving the dedicated format 110, the DUE 3B obtains the control flag 111 addressed to itself from the dedicated format 110 based on the CRC 112 in the dedicated format 110. When the control flag 111 addressed to itself is ON and the expected received power amount (Pd-PLc) is less than or equal to the threshold Th, the DUE 3B sets the transmission power of the transmission unit 63 to set the transmission power amount of D2D communication to Pd. Control. As a result, it is possible to reduce signal interference with the UL signal of CUE3A due to D2D communication.

ＤＵＥ３Ｂは、自分宛の制御フラグがＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下でない場合、Ｄ２Ｄ通信の送信電力量が閾値Ｔｈに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡのＵＬ信号への信号干渉を低減できる。 When the control flag for itself is ON and the expected received power amount (Pd-PLc) is not less than or equal to the threshold Th, the DUE 3B sets the transmission power of the transmission unit 63 to set the transmission power amount of the D2D communication to the threshold Th. Control. As a result, it is possible to reduce signal interference with the UL signal of CUE3A due to D2D communication.

しかも、ｅＮＢ２は、専用フォーマット１１０で制御フラグ１１１をダイナミックに制御対象のＤＵＥ３Ｂに送信する。その結果、ＵＬグラント毎にＤＣＩフォーマットに付加してスタッティックに制御フラグを送信する場合に比較して、スケジュール状況の変化に応じて制御フラグ１１１を制御対象の各ＤＵＥ３Ｂに送信できる。 Moreover, the eNB 2 dynamically transmits the control flag 111 in the dedicated format 110 to the DUE 3B to be controlled. As a result, the control flag 111 can be transmitted to each DUE 3B to be controlled according to the change in the schedule situation, as compared with the case where the control flag is statically transmitted by adding it to the DCI format for each UL grant.

また、上記実施例１では、ＤＣＩフォーマット９０に制御対象のＤＵＥ３Ｂの個数分の制御フラグ１０３を付加したが、ＤＵＥ３Ｂ毎に制御フラグ１０３を設定するのではなく、各ＤＵＥ３Ｂに割り当てるサブフレーム単位で制御フラグを設定しても良い。そこで、この場合の実施の形態につき、実施例４として以下に説明する。尚、上記実施例１の無線システム１と同一の構成には同一符号を付すことで、その重複する構成及び動作の説明については省略する。 Further, in the first embodiment, the control flags 103 corresponding to the number of the DUEs 3B to be controlled are added to the DCI format 90. However, instead of setting the control flag 103 for each DUE 3B, control is performed on a subframe basis to be assigned to each DUE 3B. You may set a flag. Therefore, an embodiment in this case will be described below as a fourth embodiment. The same components as those of the wireless system 1 according to the first embodiment are designated by the same reference numerals, and the description of the overlapping components and operations will be omitted.

図９は、実施例４の制御フラグを付加するＤＣＩフォーマットの一例を示す説明図である。図９に示すＤＣＩフォーマット９０Ａにサブフレーム単位の制御フラグ１０３Ａを付加する。スケジューラ３５は、サブフレームを割り当てた複数のＵＥ３の内、制御対象のＤＵＥ３Ｂが１台でもＣＵＥ３Ａと同一の無線リソースを共用しているか否かを判定する。スケジューラ３５は、制御対象のＤＵＥ３ＢがＣＵＥ３Ａと同一の無線リソースを共用している場合に、サブフレーム単位の制御フラグ１０３ＡをＯＮに設定する。また、スケジューラ３５は、サブフレーム内の複数のＵＥ３の内、制御対象のＤＵＥ３Ｂが１台でもＣＵＥ３Ａと同一の無線リソースを共用していない場合に、サブフレーム単位の制御フラグ１０３ＡをＯＦＦに設定する。 FIG. 9 is an explanatory diagram showing an example of the DCI format to which the control flag of the fourth embodiment is added. A control flag 103A for each subframe is added to the DCI format 90A shown in FIG. The scheduler 35 determines whether or not even one DUE 3B to be controlled among the plurality of UEs 3 to which the subframe is assigned shares the same radio resource as the CUE 3A. The scheduler 35 sets the control flag 103A for each subframe to ON when the DUE 3B to be controlled shares the same radio resource as the CUE 3A. Further, the scheduler 35 sets the control flag 103A for each subframe to OFF when one of the UEs 3 in the subframe, which is the control target, does not share the same radio resource as the CUE 3A. .

そして、制御信号生成部７６は、ＤＣＩフォーマット９０Ａにサブフレーム単位の制御フラグ１０３Ａを付加する。送信部２３は、制御フラグ１０３Ａを付加したＤＣＩフォーマット９０Ａを制御対象の各ＤＵＥ３Ｂに送信する。 Then, the control signal generation unit 76 adds the control flag 103A for each subframe to the DCI format 90A. The transmitter 23 transmits the DCI format 90A with the control flag 103A added to each DUE 3B to be controlled.

制御対象の各ＤＵＥ３Ｂは、制御フラグ１０３ＡがＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 When the control flag 103A is ON and the expected received power amount (Pd-PLc) is less than or equal to the threshold Th, each DUE 3B to be controlled has a transmission power of the transmission unit 63 that sets the transmission power amount of the D2D communication to Pd. To control. As a result, it is possible to reduce the signal interference of the UL signal to the CUE3A due to the D2D communication.

制御対象の各ＤＵＥ３Ｂは、制御フラグ１０３ＡがＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下でない場合、Ｄ２Ｄ通信の送信電力量を閾値Ｔｈに設定すべく
、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 When the control flag 103A is ON and the expected received power amount (Pd-PLc) is not equal to or less than the threshold Th, each DUE 3B to be controlled transmits the transmission unit 63 to set the transmission power amount of the D2D communication to the threshold Th. Control power. As a result, it is possible to reduce signal interference of the UL signal to the CUE3A due to the D2D communication.

実施例４のｅＮＢ２は、サブフレーム単位で制御フラグ１０３Ａを設定するため、ＵＥ３単位で制御フラグ１０３を設定する場合に比較してＤＣＩフォーマット９０Ａに制御フラグ１０３Ａを設定する処理の負担を軽減できる。しかも、制御フラグ１０３Ａが１ビットで済むため、ＤＣＩフォーマット９０ＡがDCI format“3”と同様のフォーマット構成
になるため、ＤＵＥ３Ｂ側でのＤＣＩフォーマット検出の細工も不要となる。 Since the eNB2 of the fourth embodiment sets the control flag 103A in subframe units, it is possible to reduce the processing load of setting the control flag 103A in the DCI format 90A as compared with the case of setting the control flag 103 in UE3 units. Moreover, since the control flag 103A has only one bit, the DCI format 90A has the same format configuration as the DCI format “3”, and therefore the DCI format detection on the DUE 3B side is not required.

尚、上記実施例４では、ＤＣＩフォーマット９０Ａにサブフレーム単位の制御フラグ１０３Ａを付加した。しかしながら、前述した通り、Ｄ２Ｄ通信では不要な制御情報、例えば、New data indicator９６等の代わりに、サブフレーム単位の制御フラグ１０３Ａを割り当てるようにしても良い。 In the fourth embodiment, the DCI format 90A is provided with the subframe-based control flag 103A. However, as described above, control information unnecessary for D2D communication, for example, the control flag 103A in subframe units may be assigned instead of the New data indicator 96 or the like.

また、上記実施例４では、ＤＣＩフォーマット９０Ａにサブフレーム単位の制御フラグ１０３Ａを付加した。しかしながら、これらに限定されるものではなく、その実施の形態につき、実施例５として以下に説明する。尚、上記実施例１の無線システム１と同一の構成には同一符号を付すことで、その重複する構成及び動作の説明は省略する。 In addition, in the fourth embodiment, the DCI format 90A is added with the control flag 103A for each subframe. However, the present invention is not limited to these, and the embodiment will be described below as Example 5. The same components as those of the wireless system 1 according to the first embodiment are designated by the same reference numerals, and the description of the overlapping components and operations will be omitted.

図１０は、実施例５の制御フラグを付加するＤＣＩフォーマットの一例を示す説明図である。図１０に示すＤＣＩフォーマット９０Ｂにサブフレーム毎の制御フラグ１０３Ｂを付加する。スケジューラ３５は、指定されたサブフレーム毎の無線リソースの共用有無を判定する。スケジューラ３５は、サブフレーム毎の判定結果で制御フラグ１０３Ｂを夫々設定する。制御信号生成部７６は、ＤＣＩフォーマット９０Ｂにサブフレーム毎の制御フラグ１０３Ｂを付加する。つまり、制御信号生成部７６は、指定されたサブフレーム個数分の制御フラグ１０３ＢをＤＣＩフォーマット９０Ｂに付加する。送信部２３は、サブフレーム毎の制御フラグ１０３Ｂを付加したＤＣＩフォーマット９０Ｂを制御対象のＤＵＥ３Ｂに送信する。 FIG. 10 is an explanatory diagram showing an example of the DCI format to which the control flag of the fifth embodiment is added. A control flag 103B for each subframe is added to the DCI format 90B shown in FIG. The scheduler 35 determines whether or not radio resources are shared for each designated subframe. The scheduler 35 sets the control flag 103B based on the determination result for each subframe. The control signal generation unit 76 adds the control flag 103B for each subframe to the DCI format 90B. That is, the control signal generation unit 76 adds the control flags 103B for the designated number of subframes to the DCI format 90B. The transmission unit 23 transmits the DCI format 90B added with the control flag 103B for each subframe to the DUE 3B to be controlled.

制御対象の各ＤＵＥ３Ｂは、自分が使用するサブフレームの制御フラグ１０３ＢがＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 Each DUE 3B to be controlled should set the transmission power amount of D2D communication to Pd when the control flag 103B of the subframe used by itself is ON and the expected received power amount (Pd-PLc) is less than or equal to the threshold Th. , And controls the transmission power of the transmitter 63. As a result, it is possible to reduce the signal interference of the UL signal to the CUE3A due to the D2D communication.

制御対象の各ＤＵＥ３Ｂは、自分が使用するサブフレームの制御フラグ１０３ＡがＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下でない場合、Ｄ２Ｄ通信の送信電力量を閾値Ｔｈに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 Each DUE 3B to be controlled sets the transmission power amount of D2D communication to the threshold Th when the control flag 103A of the subframe used by itself is ON and the expected received power amount (Pd-PLc) is not less than or equal to the threshold Th. Therefore, the transmission power of the transmitter 63 is controlled. As a result, it is possible to reduce the signal interference of the UL signal to the CUE3A due to the D2D communication.

実施例５のｅＮＢ２は、サブフレーム毎に無線リソースの共用有無を判定し、判定結果毎に制御フラグ１０３Ｂを設定する。ｅＮＢ２は、サブフレーム毎の制御フラグ１０３ＢをＤＣＩフォーマット９０Ｂに付加し、ＤＣＩフォーマット９０Ｂを制御対象のＤＵＥ３Ｂに通知する。その結果、制御対象のＤＵＥ３Ｂは、事前に将来のサブフレームの制御フラグ１０３Ｂを認識できる。制御対象のＤＵＥ３Ｂは、サブフレーム毎の制御フラグ１０３Ｂの内、自分が使用するサブフレームの制御フラグ１０３ＢがＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、送信電力量をＰｄに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 The eNB 2 of the fifth embodiment determines whether or not radio resources are shared for each subframe, and sets the control flag 103B for each determination result. The eNB 2 adds the control flag 103B for each subframe to the DCI format 90B, and notifies the DCI format 90B to the control target DUE 3B. As a result, the DUE 3B to be controlled can recognize the control flag 103B of the future subframe in advance. When the control flag 103B of the subframe used by itself is ON among the control flags 103B for each subframe and the expected received power amount (Pd-PLc) is less than or equal to the threshold value Th, the DUE 3B to be controlled has the transmitted power amount. The transmission power of the transmission unit 63 is controlled so as to set Pd to Pd. As a result, it is possible to reduce the signal interference of the UL signal to the CUE3A due to the D2D communication.

制御対象のＤＵＥ３Ｂは、サブフレーム毎の制御フラグの内、自分が使用するサブフレームの制御フラグ１０３ＢがＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下でない場合、送信電力量が閾値Ｔｈに設定すべく、送信部６３の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 When the control flag 103B of the subframe used by itself is ON among the control flags for each subframe and the predicted received power amount (Pd-PLc) is not less than or equal to the threshold value Th, the DUE 3B to be controlled has the transmission power amount. The transmission power of the transmitter 63 is controlled to set the threshold value Th. As a result, it is possible to reduce the signal interference of the UL signal to the CUE3A due to the D2D communication.

尚、上記実施例１では、ＤＵＥ３Ｂ側で制御フラグをＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、Ｄ２Ｄ通信の送信電力量がＰｄに設定すべく、送信部６３の送信電力を制御した。しかしながら、これに限定されるものではなく、その実施の形態につき、実施例６として以下に説明する。尚、上記実施例１の無線システム１と同一の構成には同一符号を付すことで、その重複する構成及び動作の説明については省略する。 In the first embodiment, when the control flag is turned on on the DUE 3B side and the expected received power amount (Pd-PLc) is equal to or less than the threshold Th, the transmission unit 63 should set the transmission power amount of D2D communication to Pd. Controlled the transmission power of. However, the present invention is not limited to this, and the embodiment will be described below as Example 6. The same components as those of the wireless system 1 according to the first embodiment are designated by the same reference numerals, and the description of the overlapping components and operations will be omitted.

図１１は、実施例６の通信制御処理に関わるＤＵＥ３Ｂの処理動作の一例を示すフローチャートである。図１１においてＤＵＥ３Ｂの通信制御部８１は、Ｄ２Ｄ通信の送信電力量Ｐｄを算出し（ステップＳ２１）、制御フラグ１０３がＯＮであるか否かを判定する（ステップＳ２２）。通信制御部８１は、制御フラグ１０３がＯＮの場合（ステップＳ２２肯定）、Ｄ２Ｄ通信を中止し（ステップＳ２３）、図１１に示す処理動作を終了する。尚、通信制御部８１は、Ｄ２Ｄ通信のデータ信号生成部７５、制御信号生成部７６やＲＳ生成部７７を停止することでＤ２Ｄ通信を中止する。 FIG. 11 is a flowchart illustrating an example of the processing operation of the DUE 3B related to the communication control processing of the sixth embodiment. In FIG. 11, the communication control unit 81 of the DUE 3B calculates the transmission power amount Pd of D2D communication (step S21), and determines whether the control flag 103 is ON (step S22). When the control flag 103 is ON (Yes at Step S22), the communication control unit 81 stops the D2D communication (Step S23) and ends the processing operation illustrated in FIG. The communication control unit 81 stops the D2D communication by stopping the data signal generation unit 75, the control signal generation unit 76, and the RS generation unit 77 of the D2D communication.

通信制御部８１は、制御フラグ１０３がＯＮでない場合（ステップＳ２２否定）、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、送信部６３の送信電力を制御してＤ２Ｄ通信を実行し（ステップＳ２４）、図１１に示す処理動作を終了する。 When the control flag 103 is not ON (No at Step S22), the communication control unit 81 controls the transmission power of the transmission unit 63 to execute the D2D communication so as to set the transmission power amount of the D2D communication to Pd (Step S24). ), The processing operation shown in FIG. 11 ends.

図１１に示す通信制御処理を実行するＤＵＥ３Ｂは、制御フラグ１０３がＯＮの場合、送信電力を制御することなく、Ｄ２Ｄ通信を中止する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 When the control flag 103 is ON, the DUE 3B that executes the communication control process illustrated in FIG. 11 suspends the D2D communication without controlling the transmission power. As a result, it is possible to reduce the signal interference of the UL signal to the CUE3A due to the D2D communication.

実施例５のＤＵＥ３Ｂは、制御フラグ１０３がＯＮの場合、送信電力を制御することなく、Ｄ２Ｄ通信を中止する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡへのＵＬ信号の信号干渉を低減できる。 When the control flag 103 is ON, the DUE 3B of the fifth embodiment stops the D2D communication without controlling the transmission power. As a result, it is possible to reduce the signal interference of the UL signal to the CUE3A due to the D2D communication.

尚、上記実施例１では、ＤＵＥ３Ｂ側で制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、Ｄ２Ｄ通信の送信電力量がＰｄに設定すべく、送信部６３の送信電力を制御する。しかしながら、これに限定されるものではなく、その実施の形態につき、実施例７として以下に説明する。尚、上記実施例１の無線システム１と同一の構成には同一符号を付すことで、その重複する構成及び動作の説明については省略する。 In the first embodiment, when the control flag 103 is ON on the DUE 3B side and the expected received power amount (Pd-PLc) is less than or equal to the threshold Th, the transmission unit should set the transmission power amount of D2D communication to Pd. The transmission power of 63 is controlled. However, the present invention is not limited to this, and the embodiment will be described below as Example 7. The same components as those of the wireless system 1 according to the first embodiment are designated by the same reference numerals, and the description of the overlapping components and operations will be omitted.

図１２は、実施例７の通信制御処理に関わるＤＵＥ３Ｂの処理動作の一例を示すフローチャートである。図１２においてＤＵＥ３Ｂ内の通信制御部８１は、Ｄ２Ｄ通信の送信電力量Ｐｄを算出し（ステップＳ３１）、制御フラグ１０３がＯＮであるか否かを判定する（ステップＳ３２）。通信制御部８１は、制御フラグ１０３がＯＮの場合（ステップＳ３２肯定）、ｅＮＢ２ＡとのパスロスＰＬｃを算出する（ステップＳ３３）。 FIG. 12 is a flowchart illustrating an example of the processing operation of the DUE 3B related to the communication control processing of the seventh embodiment. In FIG. 12, the communication control unit 81 in the DUE 3B calculates the transmission power amount Pd of D2D communication (step S31) and determines whether the control flag 103 is ON (step S32). When the control flag 103 is ON (Yes at Step S32), the communication control unit 81 calculates the path loss PLc with the eNB 2A (Step S33).

通信制御部８１は、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下であるか否かを判定する（ステップＳ３４）。通信制御部８１は、予想受信電力量（ＰＤ−ＰＬｃ）が閾値Ｔｈ以下の場合（ステップＳ３４肯定）、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、
送信部６３内の送信電力を制御してＤ２Ｄ通信を実行し（ステップＳ３５）、図１２に示す処理動作を終了する。 The communication control unit 81 determines whether or not the predicted received power amount (Pd-PLc) is less than or equal to the threshold Th (step S34). When the expected received power amount (PD-PLc) is less than or equal to the threshold Th (Yes in step S34), the communication control unit 81 sets the transmission power amount of D2D communication to Pd.
The transmission power in the transmitter 63 is controlled to execute the D2D communication (step S35), and the processing operation shown in FIG. 12 ends.

通信制御部８１は、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下でない場合（ステップＳ３４否定）、Ｄ２Ｄ通信を中止し（ステップＳ３６）、図１２に示す処理動作を終了する。尚、通信制御部８１は、データ信号生成部７５、制御信号生成部７６やＲＳ生成部７７を停止し、Ｄ２Ｄ通信を中止する。 When the predicted received power amount (Pd-PLc) is not equal to or smaller than the threshold Th (No at step S34), the communication control unit 81 stops the D2D communication (step S36) and ends the processing operation illustrated in FIG. The communication control unit 81 stops the data signal generation unit 75, the control signal generation unit 76, and the RS generation unit 77 to stop the D2D communication.

通信制御部８１は、制御フラグ１０３がＯＮでない場合（ステップＳ３２否定）、Ｄ２Ｄ通信の送信電力量をＰｄに設定すべく、送信部６３内の送信電力を制御してＤ２Ｄ通信を実行し（ステップＳ３７）、図１２に示す処理動作を終了する。 When the control flag 103 is not ON (No at step S32), the communication control unit 81 controls the transmission power in the transmission unit 63 to execute the D2D communication so as to set the transmission power amount of the D2D communication to Pd (step S32). S37), and ends the processing operation shown in FIG.

図１２に示す通信制御処理を実行するＤＵＥ３Ｂは、制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、Ｄ２Ｄ通信の送信電力量がＰｄに設定すべく、送信部６３内の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡのＵＬ信号への信号干渉を低減できる。 When the control flag 103 is ON and the expected received power amount (Pd-PLc) is less than or equal to the threshold value Th, the DUE 3B that executes the communication control process illustrated in FIG. 12 sets the transmission power amount of the D2D communication to Pd, The transmission power in the transmitter 63 is controlled. As a result, it is possible to reduce signal interference with the UL signal of CUE3A due to D2D communication.

ＤＵＥ３Ｂは、制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下でない場合、Ｄ２Ｄ通信を中止する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡのＵＬ信号への信号干渉を低減できる。 When the control flag 103 is ON and the predicted received power amount (Pd-PLc) is not equal to or less than the threshold Th, the DUE 3B stops the D2D communication. As a result, it is possible to reduce signal interference with the UL signal of CUE3A due to D2D communication.

実施例７のＤＵＥ３Ｂは、制御フラグ１０３がＯＮ、かつ、予想受信電力量（Ｐｄ−ＰＬｃ）が閾値Ｔｈ以下の場合、Ｄ２Ｄ通信の送信電力量がＰｄに設定すべく、送信部６３内の送信電力を制御する。その結果、Ｄ２Ｄ通信によるＣＵＥ３ＡのＵＬ信号への信号干渉を低減できる。 When the control flag 103 is ON and the expected received power amount (Pd-PLc) is less than or equal to the threshold Th, the DUE 3B according to the seventh embodiment performs transmission within the transmission unit 63 to set the transmission power amount for D2D communication to Pd. Control power. As a result, it is possible to reduce signal interference with the UL signal of CUE3A due to D2D communication.

尚、上記実施例では、説明の便宜上、ＵＥ３が、ＣＵＥ３Ａ及びＤＵＥ３Ｂの機能を切替可能にする移動局として説明した。しかしながら、例えば、ＤＵＥ３Ｂとしての機能しか備えていない移動局にも適用可能である。 In addition, in the said Example, UE3 demonstrated as the mobile station which can switch the function of CUE3A and DUE3B for convenience of explanation. However, for example, it is also applicable to a mobile station having only the function of the DUE 3B.

また、本実施例のｅＮＢ２は、無線機能及び制御機能を有する一体装置で説明したが、これに限定されるものではなく、無線装置と制御装置とを個別にしてｅＮＢを構成するようにしても良い。この場合、無線装置は、アンテナ１１及びＲＦ回路１２を内蔵し、制御装置は、メモリ１３及びプロセッサ１４を内蔵するものとする。 Further, the eNB 2 of this embodiment has been described as an integrated device having a wireless function and a control function, but the present invention is not limited to this, and the wireless device and the control device may be configured separately to configure the eNB. good. In this case, the wireless device has the antenna 11 and the RF circuit 12 built-in, and the control device has the memory 13 and the processor 14 built-in.

また、図示した各部の各構成要素は、必ずしも物理的に図示の如く構成されていることを要しない。すなわち、各部の分散・統合の具体的形態は図示のものに限られず、その全部又は一部を、各種の負荷や使用状況等に応じて、任意の単位で機能的又は物理的に分散・統合して構成することができる。 In addition, each component of each unit illustrated does not necessarily have to be physically configured as illustrated. That is, the specific form of the distribution / integration of each part is not limited to that shown in the figure, and all or part of the part may be functionally or physically distributed / integrated in arbitrary units according to various loads and usage conditions. Can be configured.

更に、各装置で行われる各種処理機能は、ＣＰＵ（Central Processing Unit）（又は
ＭＰＵ（Micro Processing Unit）、ＭＣＵ（Micro Controller Unit）等のマイクロ・コンピュータ）上で、その全部又は任意の一部を実行するようにしても良い。また、各種処理機能は、ＣＰＵ（又はＭＰＵ、ＭＣＵ等のマイクロ・コンピュータ）で解析実行するプログラム上、又はワイヤードロジックによるハードウェア上で、その全部又は任意の一部を実行するようにしても良いことは言うまでもない。 Further, various processing functions performed by each device are entirely or arbitrarily partly performed on a CPU (Central Processing Unit) (or a microcomputer such as an MPU (Micro Processing Unit) and an MCU (Micro Controller Unit)). It may be executed. In addition, various processing functions may be executed in whole or in part on a program analyzed by a CPU (or a microcomputer such as MPU or MCU) or on hardware by a wired logic. Needless to say.

１無線システム
２ｅＮＢ
３ＵＥ
３ＡＣＵＥ
３ＢＤＵＥ
３５スケジューラ
４２位置判定部
６２受信部
６３送信部
８１通信制御部 1 Wireless system 2 eNB
3 UE
3A CUE
3B DUE
35 scheduler 42 position determination unit 62 reception unit 63 transmission unit 81 communication control unit

Claims

A base station device that performs wireless communication with a mobile station device that performs wireless communication between mobile station devices,
Control for notifying the mobile station device of control information including a control flag regarding transmission power in the direct wireless communication when the mobile station device directly performs wireless communication with another mobile station device without going through the base station device Section ,
The control flag, in the mobile station device, when the control flag is on, calculates the propagation loss between the base station device and the mobile station device, from the temporary transmission power value of the direct wireless communication When the value obtained by subtracting the propagation loss is less than or equal to the threshold value, the temporary transmission power value is used to transmit to the other mobile station device, and the value obtained by subtracting the propagation loss from the temporary transmission power value is more than the threshold value. When the control flag is off, it transmits to the other mobile station apparatus using the temporary transmission power value when the control flag is off. the base station apparatus, characterized in that it.

On the control information, before Symbol another base station apparatus according to claim 1, characterized in that it comprises information about the radio resources used in the direct radio communication with the mobile station apparatus.

The control information includes information indicating that a radio resource used in direct radio communication between the mobile station device and another mobile station device is a radio resource shared between mobile station devices. Item 1. The base station device according to Item 1.

The control unit is
Wherein the mobile station apparatus, the direct radio to notify the control information on the implementation of the communication and wherein the base station apparatus according to any one of claims 1 to 3.

Wherein,
If the mobile station device performing pre-SL direct wireless communication there are multiple, according to claim 1, wherein the notifying the control flag set for each of the mobile station device Base station equipment.

The control unit is
When there are a plurality of mobile station apparatuses that perform the direct wireless communication , the subframes assigned to each mobile station apparatus are used to notify each mobile station apparatus of the control flag set for each mobile station apparatus. The base station apparatus according to claim 1, wherein the base station apparatus is a base station apparatus.

A mobile station device capable of performing wireless communication with a base station device and another mobile station device,
In the case of performing direct wireless communication with another mobile station device without going through the base station device, a receiving unit that receives control information including a control flag related to transmission power in the direct wireless communication ,
When the received control flag transmitted from the base station device is on, the propagation loss between the base station device and the mobile station device is calculated, and the propagation is performed from the temporary transmission power value of the direct wireless communication. When the value less the loss is less than or equal to a threshold value, the temporary transmission power value is used to transmit to the other mobile station device, and the value obtained by subtracting the propagation loss from the temporary transmission power value is more than the threshold value. When it is large, the transmission power value of the threshold is used to transmit to the other mobile station device, and when the received control flag is off, the temporary transmission power value is used to transmit to the other mobile station device. A mobile station device having a control unit for controlling as described above .

The receiving unit receives the control information on the implementation of the direct radio communication,
The mobile station apparatus according to claim 7, wherein the control unit executes the control of the direct wireless communication.

A mobile station device capable of wireless communication with another mobile station device, and a base station device wirelessly communicating with the mobile station device,
First communication in which the mobile station device performs wireless communication with another mobile station device via the base station device, or direct communication of the mobile station device with another mobile station device not via the base station device A wireless communication system for performing second communication for executing
The base station device,
A control unit that notifies the mobile station device of control information including a control flag regarding transmission power in the second communication when the mobile station device performs the second communication ,
In the mobile station apparatus, when the control flag is on, the control flag calculates a propagation loss between the base station apparatus and the mobile station apparatus, and calculates the propagation loss value from the temporary transmission power value of the second communication. When the value obtained by subtracting the propagation loss is less than or equal to the threshold value, the temporary transmission power value is used to transmit to the other mobile station device, and the value obtained by subtracting the propagation loss from the temporary transmission power value is more than the threshold value. When the control flag is off, it transmits to the other mobile station device using the tentative transmission power value. Wireless communication system.

A communication control method in a base station device that performs wireless communication with a mobile station device, comprising:
In the case where the mobile station device directly performs wireless communication with another mobile station device without going through the base station device, notifies the mobile station device of control information including a control flag relating to transmission power in the direct wireless communication ,
The control flag, in the mobile station device, when the control flag is on, calculates the propagation loss between the base station device and the mobile station device, from the temporary transmission power value of the direct wireless communication When the value obtained by subtracting the propagation loss is less than or equal to the threshold value, the temporary transmission power value is used to transmit to the other mobile station device, and the value obtained by subtracting the propagation loss from the temporary transmission power value is more than the threshold value. When the control flag is off, it transmits to the other mobile station apparatus using the temporary transmission power value when the control flag is off. communication control method of a base station apparatus, characterized in that it.

A communication control method in a mobile station device capable of wirelessly communicating with a base station device, comprising:
When directly wirelessly communicating with another mobile station device without going through the base station device, receiving control information including a control flag relating to transmission power in the direct wireless communication ,
When the received control flag is on, a propagation loss between the base station device and the mobile station device is calculated, and a value obtained by subtracting the propagation loss from the temporary transmission power value of the direct wireless communication is equal to or less than a threshold value. When transmitted to the other mobile station device using the temporary transmission power value, the transmission power of the threshold when the value obtained by subtracting the propagation loss from the temporary transmission power value is greater than the threshold value. A value is used to transmit to the other mobile station apparatus, and when the received control flag is off, control is performed to transmit to the other mobile station apparatus using the temporary transmission power value. Communication control method for mobile station device.