JP2015149615A - Transmitter and transmission control method - Google Patents
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本発明は、送信装置および送信制御方法に関する。 The present invention relates to a transmission device and a transmission control method.
現在、３ＧＰＰ(Third Generation Partnership Project)にて規格化されたＬＴＥ(Long Term Evolution)の通信方式が普及している。ＬＴＥには、周波数分割方式(ＦＤ−ＬＴＥ)と時分割方式(ＴＤ−ＬＴＥ)があって、現状では、何れかの方式を採用している通信事業者がほとんどである。ここで、複数の周波数帯を同時に利用するキャリアアグリゲーション（CA：Carrier Aggregation）という技術が規格化された（例えば、特許文献１参照）。このため、理論上では、ＦＤ−ＬＴＥ、ＴＤ−ＬＴＥのそれぞれの方式が同時に利用できるようになった。 At present, the LTE (Long Term Evolution) communication method standardized by 3GPP (Third Generation Partnership Project) is in widespread use. LTE has a frequency division method (FD-LTE) and a time division method (TD-LTE), and at present, most of the communication carriers adopt either method. Here, a technique called carrier aggregation (CA) that uses a plurality of frequency bands at the same time has been standardized (for example, see Patent Document 1). For this reason, in theory, the FD-LTE and TD-LTE systems can be used simultaneously.
しかしながら、１つの無線通信システムで、複数の周波数帯の送受信を同時に行うと、複数周波数帯での通信による相互変調(InterModulation：IM)、２次高調波の回り込みによる不具合、または、複数周波数帯を送信することで、基地局の消費電力も大きくなるといった課題がある。 However, if transmission / reception of multiple frequency bands is performed simultaneously in one wireless communication system, problems due to intermodulation (IM) due to communication in multiple frequency bands, wraparound of second harmonics, or multiple frequency bands There is a problem that the power consumption of the base station increases by transmitting.
そこで、本発明は、従来の課題を解決するためになされたもので、複数の周波数帯を同時に利用するキャリアアグリゲーションを行う際に、複数周波数帯での通信による不具合や基地局の消費電力の抑止できる送信装置および送信制御方法を提供することを目的とする。 Therefore, the present invention has been made to solve the conventional problems, and when performing carrier aggregation using a plurality of frequency bands at the same time, it suppresses problems caused by communication in the plurality of frequency bands and power consumption of the base station. An object of the present invention is to provide a transmission device and a transmission control method that can be used.
本発明の送信装置は、キャリアアグリゲーションにて時分割多重方式と他の通信方式の双方の方式で通信を同時に行う無線通信部を有し、前記無線通信部は、前記時分割多重方式の送信期間中に前記他の通信方式の送信を制御する構成を有している。 The transmission apparatus of the present invention includes a wireless communication unit that simultaneously performs communication using both a time division multiplexing method and another communication method by carrier aggregation, and the wireless communication unit transmits a transmission period of the time division multiplexing method. A configuration for controlling transmission of the other communication method.
また、本発明の送信装置は、キャリアアグリゲーションにて時分割多重方式と他の通信方式の双方の方式で通信を同時に行う無線通信部を有し、前記無線通信部は、前記時分割多重方式の送信期間中に前記他の通信方式の送信出力を低下するように送信を制御する構成を有している。 In addition, the transmission apparatus of the present invention includes a wireless communication unit that simultaneously performs communication in both a time division multiplexing method and another communication method using carrier aggregation, and the wireless communication unit includes the time division multiplexing method. The transmission is controlled so as to reduce the transmission output of the other communication method during the transmission period.
また、本発明の送信装置は、キャリアアグリゲーションにて時分割多重方式と他の通信方式の双方の方式で通信を同時に行う無線通信部を有し、前記無線通信部は、前記時分割多重方式の送信期間中に前記他の通信方式の変調方式を低レートに制限するように送信を制御する構成を有している。 In addition, the transmission apparatus of the present invention includes a wireless communication unit that simultaneously performs communication in both a time division multiplexing method and another communication method using carrier aggregation, and the wireless communication unit includes the time division multiplexing method. The transmission is controlled so that the modulation method of the other communication method is limited to a low rate during the transmission period.
また、本発明の送信制御方法は、キャリアアグリゲーションにて時分割多重方式と他の通信方式の双方の方式で通信を同時に行う無線通信部を有する送信装置の送信制御方法において、前記時分割多重方式の送信期間中に前記他の通信方式の送信を制御するステップを有する。 Further, the transmission control method of the present invention is the transmission control method of a transmission apparatus having a radio communication unit that performs communication by both the time division multiplexing method and other communication methods at the same time by carrier aggregation. A step of controlling transmission of the other communication method during the transmission period.
本発明は、複数の周波数帯を同時に利用するキャリアアグリゲーションを行う際に、複数周波数帯での通信による不具合や基地局の消費電力の抑止できる送信装置および送信制御方法を提供するものである。 The present invention provides a transmission apparatus and a transmission control method capable of suppressing problems caused by communication in a plurality of frequency bands and power consumption of a base station when performing carrier aggregation using a plurality of frequency bands at the same time.
以下、本発明の実施の形態について、図面を参照して説明する。 Embodiments of the present invention will be described below with reference to the drawings.
図１は、本発明の実施の形態に係る無線通信システムの構成図である。図１に示した無線通信システムは、ＦＤ−ＬＴＥを用いて通信する無線端末１０ａ、ＴＤ−ＬＴＥを用いて通信する無線端末１０ｂ、および、キャリアアグリゲーションにてＦＤ−ＬＴＥとＴＤ−ＬＴＥの双方の方式を提供する基地局装置２０を有している。なお、無線端末１０をそれぞれ区別する場合には、無線端末１０ａ、１０ｂと記載し、それぞれを区別しない場合には、無線端末１０と記載する。 FIG. 1 is a configuration diagram of a radio communication system according to an embodiment of the present invention. The wireless communication system shown in FIG. 1 includes both a wireless terminal 10a that communicates using FD-LTE, a wireless terminal 10b that communicates using TD-LTE, and both FD-LTE and TD-LTE in carrier aggregation. A base station apparatus 20 that provides a scheme is included. In addition, when distinguishing each wireless terminal 10, it describes as wireless terminal 10a, 10b, and when not distinguishing each, it describes as wireless terminal 10.
図２は、本発明の実施の形態に係る基地局装置のブロック図である。基地局装置２０は、無線通信部２１、ネットワークインタフェース２２、および制御部２３を有している。 FIG. 2 is a block diagram of the base station apparatus according to the embodiment of the present invention. The base station device 20 includes a wireless communication unit 21, a network interface 22, and a control unit 23.
無線通信部２１は、無線端末１０と通信するためにアンテナ（図示していない）からマルチキャリア信号を送受信するものである。例えば、無線通信部２１は、ＯＦＤＭまたはＯＦＤＭＡ方式に準拠し、キャリアアグリゲーションにてＦＤ−ＬＴＥとＴＤ−ＬＴＥの双方の方式で通信を行うものである。 The wireless communication unit 21 transmits and receives multicarrier signals from an antenna (not shown) in order to communicate with the wireless terminal 10. For example, the wireless communication unit 21 is compliant with the OFDM or OFDMA system, and performs communication in both FD-LTE and TD-LTE systems by carrier aggregation.
制御部２３は、例えばプログラムを実行するＣＰＵ、ＲＯＭ、ＲＡＭなどによって構成される。 The control unit 23 includes, for example, a CPU that executes a program, a ROM, a RAM, and the like.
さらに、無線通信部２１は、制御部２３から出力された信号を変調処理し、変調処理された信号を無線信号に変換して送信するようになっており、受信した信号を変換し、変換したものを復調処理して制御部２３に出力するようになっている。 Further, the radio communication unit 21 modulates the signal output from the control unit 23, converts the modulated signal into a radio signal, and transmits the signal. The received signal is converted and converted. The signal is demodulated and output to the control unit 23.
ネットワークインタフェース２２は、インターネットや電話網との通信を行うものである。 The network interface 22 performs communication with the Internet or a telephone network.
なお、ＬＴＥのフレーム構造は、３ＧＰＰにて規格化されたＴＳ３６．２１１で定義されている。詳細は、ＴＳ３６．２１１（Ｖ１２．０．０）を参照されたい。 Note that the LTE frame structure is defined in TS 36.211 standardized by 3GPP. For details, refer to TS36.211 (V12.0.0).
図３は、ＦＤ−ＬＴＥのフレーム構造を表す図である。ＴＳ３６．２１１のＦｉｇｕｒｅ４．１−１と同様のものである。 FIG. 3 is a diagram illustrating a frame structure of FD-LTE. It is the same as FIG. 4.1-1 of TS36.211.
図４は、ＴＤ−ＬＴＥのフレーム構造を表す図である。ＴＳ３６．２１１のＦｉｇｕｒｅ４．２−１と同様のものである。 FIG. 4 is a diagram illustrating a frame structure of TD-LTE. It is the same as FIG. 4.2-1 of TS36.211.
ＦＤ−ＬＴＥとＴＤ−ＬＴＥのフレーム構造のどちらも１つのＦｒａｍｅを１０ｍｓｅｃとすることができる。 In both the FD-LTE and TD-LTE frame structures, one frame can be set to 10 msec.
また、ＴＤ−ＬＴＥについては、７種類のＵｐＬｉｎｋ／ＤｏｗｎＬｉｎｋコンフィグレーションがある。 For TD-LTE, there are seven types of UpLink / DownLink configurations.
図５は、ＴＤ−ＬＴＥのＵｐＬｉｎｋ／ＤｏｗｎＬｉｎｋコンフィグレーションを表す図である。ＴＳ３６．２１１のＴａｂｌｅ４．２−２で定義されたものと同様のものである。本発明の実施の形態では、ＴＤ−ＬＴＥのコンフィグレーションの１を例に説明する。 FIG. 5 is a diagram illustrating an UpLink / DownLink configuration of TD-LTE. This is the same as that defined in Table 4.2.2 of TS36.211. In the embodiment of the present invention, description will be given by taking an example of TD-LTE configuration 1 as an example.
ここで、従来のＦＤ−ＬＴＥおよびＴＤ−ＬＴＥの送信フレームと出力の関係について説明する。 Here, the relationship between the transmission frame and output of conventional FD-LTE and TD-LTE will be described.
図６は、従来のＦＤ−ＬＴＥの送信フレームと出力の関係を表す図である。ＦＤ−ＬＴＥは周波数帯域ごとに送信／受信が分かれているので一定パワーで送信されるのみである。 FIG. 6 is a diagram illustrating a relationship between a transmission frame and output of a conventional FD-LTE. FD-LTE is only transmitted at a constant power because transmission / reception is divided for each frequency band.
図７は、従来のＴＤ−ＬＴＥの送信フレームと出力の関係を表す図である。同一周波数帯で送受信されるＴＤ−ＬＴＥについては送信時のみパワーが出ることとなる。 FIG. 7 is a diagram illustrating a relationship between a transmission frame and output of a conventional TD-LTE. For TD-LTE transmitted and received in the same frequency band, power is output only during transmission.
以下、本発明の実施の形態の動作について説明する。なお、無線通信部２１（送信装置）がキャリアアグリゲーションにてＦＤ−ＬＴＥとＴＤ−ＬＴＥの双方の方式で通信を同時に行うときの動作を示している。 The operation of the embodiment of the present invention will be described below. In addition, the operation | movement when the radio | wireless communication part 21 (transmission apparatus) performs communication simultaneously by the system of both FD-LTE and TD-LTE by a carrier aggregation is shown.
図８は、ＴＤ−ＬＴＥおよびＦＤ−ＬＴＥの送信出力制御を行ったときの送信フレームと出力の関係を表す図である。 FIG. 8 is a diagram illustrating a relationship between a transmission frame and an output when transmission output control of TD-LTE and FD-LTE is performed.
本実施例では、無線通信部２１がキャリアアグリゲーションにてＦＤ−ＬＴＥとＴＤ−ＬＴＥの双方の方式で通信を行う場合において、ＴＤ−ＬＴＥ側の送信時にＦＤ−ＬＴＥ側の送信出力を下げるように制御している。このように制御するため、複数周波数帯での通信による不具合や基地局の消費電力の抑止できる。 In the present embodiment, when the wireless communication unit 21 performs communication using both FD-LTE and TD-LTE in carrier aggregation, the transmission output on the FD-LTE side is lowered during transmission on the TD-LTE side. I have control. Because of such control, it is possible to suppress problems caused by communication in a plurality of frequency bands and power consumption of the base station.
また、以下、他の実施例の動作について説明する。 The operation of other embodiments will be described below.
図９は、ＴＤ−ＬＴＥおよびＦＤ−ＬＴＥの変調出力制御を行ったときの送信フレームと出力の関係を表す図である。 FIG. 9 is a diagram illustrating a relationship between transmission frames and outputs when modulation output control of TD-LTE and FD-LTE is performed.
この他の実施例では、無線通信部２１がキャリアアグリゲーションにてＦＤ−ＬＴＥとＴＤ−ＬＴＥの双方の方式で通信を行う場合において、ＴＤ−ＬＴＥ側の送信時にＦＤ−ＬＴＥの変調方式で低レートに制限するように制御している。このように制御するため、ＰＡＰＲ(Peak to Average Power Ratio)が下がり、複数周波数帯での通信による不具合や基地局の消費電力の抑止できる。 In another embodiment, when the wireless communication unit 21 performs communication using both the FD-LTE and TD-LTE schemes by carrier aggregation, the FD-LTE modulation scheme is used for transmission at a low rate when transmitting on the TD-LTE side. Control to limit to. Since control is performed in this way, the PAPR (Peak to Average Power Ratio) decreases, and it is possible to suppress problems caused by communication in a plurality of frequency bands and power consumption of the base station.
複数の周波数帯で送信するキャリアアグリゲーションでは、相互変調や２次高調波の回り込みによる不要波が発生するが、本発明の実施の形態では、図８および図９で説明したいずれの制御においても、ＦＤ−ＬＴＥ側の送信制御を行うことにより、不要波を低減できる。また、不要波の削減のみならず、送信時の消費電流低減も期待できるため、送信装置の消費電力の改善に期待できる。 In carrier aggregation transmitted in a plurality of frequency bands, unnecessary waves are generated due to intermodulation and wraparound of second harmonics. In the embodiment of the present invention, in any of the controls described in FIGS. 8 and 9, By performing transmission control on the FD-LTE side, unnecessary waves can be reduced. Moreover, since not only the reduction of unnecessary waves but also the reduction of current consumption during transmission can be expected, it can be expected to improve the power consumption of the transmission apparatus.
本発明の実施の形態では、基地局装置を例にとって説明したが、無線端末に本発明の送信装置を実装することもできる。 In the embodiment of the present invention, the base station apparatus has been described as an example. However, the transmission apparatus of the present invention can be mounted on a wireless terminal.
１０ 無線端末
２０ 基地局装置
２１ 無線通信部
２２ ネットワークインタフェース
２３ 制御部
DESCRIPTION OF SYMBOLS 10 Wireless terminal 20 Base station apparatus 21 Wireless communication part 22 Network interface 23 Control part
Claims (4)
前記無線通信部は、前記時分割多重方式の送信期間中に前記他の通信方式の送信を制御する送信装置。 It has a wireless communication unit that performs communication simultaneously in both the time division multiplexing method and other communication methods by carrier aggregation,
The wireless communication unit is a transmission device that controls transmission of the other communication method during the transmission period of the time division multiplexing method.
前記無線通信部は、前記時分割多重方式の送信期間中に前記他の通信方式の送信出力を低下するように送信を制御する送信装置。 It has a wireless communication unit that performs communication simultaneously in both the time division multiplexing method and other communication methods by carrier aggregation,
The wireless communication unit is a transmission device that controls transmission so as to reduce a transmission output of the other communication method during a transmission period of the time division multiplexing method.
前記無線通信部は、前記時分割多重方式の送信期間中に前記他の通信方式の変調方式を低レートに制限するように送信を制御する送信装置。 It has a wireless communication unit that performs communication simultaneously in both the time division multiplexing method and other communication methods by carrier aggregation,
The wireless communication unit is a transmission device that controls transmission so as to limit a modulation method of the other communication method to a low rate during a transmission period of the time division multiplexing method.
前記時分割多重方式の送信期間中に前記他の通信方式の送信を制御するステップを有する送信制御方法。 In a transmission control method of a transmission apparatus having a wireless communication unit that performs communication simultaneously in both the time division multiplexing method and other communication methods in carrier aggregation,
A transmission control method comprising a step of controlling transmission of the other communication method during the transmission period of the time division multiplexing method.
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