JP2014171112A - Radio terminal device and radio base station device - Google Patents

Radio terminal device and radio base station device Download PDF

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JP2014171112A
JP2014171112A JP2013042065A JP2013042065A JP2014171112A JP 2014171112 A JP2014171112 A JP 2014171112A JP 2013042065 A JP2013042065 A JP 2013042065A JP 2013042065 A JP2013042065 A JP 2013042065A JP 2014171112 A JP2014171112 A JP 2014171112A
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communication
base station
radio
frequency band
wireless
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JP6140479B2 (en
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Xiaoqiu Wang
暁秋 王
Yosuke Akimoto
陽介 秋元
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KDDI Corp
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PROBLEM TO BE SOLVED: To allow a radio terminal device to cope with frequency variations in radio link communication quality when the radio terminal device uses part of all frequency bands available to a radio base station device.SOLUTION: A radio terminal device comprises: a radio unit 10 that is able to select any part of frequency bands from all frequency bands to use it for radio communication; and a communication control unit 11 that receives information indicating a communication frequency band used for radio communication from a radio base station device. The radio unit 10 performs radio communication with the radio base station device using the communication frequency band notified by the radio base station device.

Description

本発明は、無線端末装置および無線基地局装置に関する。   The present invention relates to a radio terminal apparatus and a radio base station apparatus.

３ＧＰＰ（3rd Generation Partnership Project）で標準化作業が進められているＬＴＥ（Long Term Evolution）−Ａｄｖａｎｃｅｄ以降の無線通信規格では、従来のＬＴＥ規格よりも広帯域化が図られている（例えば非特許文献１参照）。その広帯域化技術の一つとして、キャリアアグリゲーション（Carrier aggregation）技術が知られている。キャリアアグリゲーション技術では、無線通信に使用する周波数帯域の単位であるコンポーネントキャリア（Component Carrier）を複数束ねて使用することにより、広帯域化を図る。   In the wireless communication standards after LTE (Long Term Evolution) -Advanced, which is being standardized by 3GPP (3rd Generation Partnership Project), a wider bandwidth is achieved than the conventional LTE standards (for example, see Non-Patent Document 1). ). As one of the wideband technologies, a carrier aggregation technology is known. In the carrier aggregation technology, a wider band is achieved by using a plurality of component carriers that are units of frequency bands used for wireless communication.

また、ＬＴＥ規格において、「Machine-Type Communications；ＭＴＣ）をサポートするために、使用可能帯域が狭いＭＴＣ端末が検討されている。ＭＴＣ端末では、構成を簡単にするために、使用可能な全周波数帯域のうち中心部分の周波数帯域のみをサポートする。   In addition, in the LTE standard, an MTC terminal having a narrow usable band is studied to support “Machine-Type Communications (MTC). In the MTC terminal, in order to simplify the configuration, all usable frequencies are considered. Only the central frequency band of the band is supported.

ベンジャブールアナス，岸山祥久，石井啓之，中村武宏，“Conceptual Views and Radio Access Technologies for Future Evolution of LTE-A”，信学技報，vol. 112，no. 192，RCS2012-100，pp. 25-30，2012年8月Benjabur Anas, Yoshihisa Kishiyama, Hiroyuki Ishii, Takehiro Nakamura, “Conceptual Views and Radio Access Technologies for Future Evolution of LTE-A”, IEICE Technical Report, vol. 112, no. 192, RCS2012-100, pp. 25- 30, August 2012

上述したキャリアアグリゲーション技術をサポートしておらず、一コンポーネントキャリアのみを使用して無線通信する端末では、周波数帯域がそれぞれ定義された複数のコンポーネントキャリアのうち、いずれか一つのコンポーネントキャリアを使用する。したがって、当該端末は、コンポーネントキャリア単位で、無線通信に使用する周波数帯域を変更可能である。しかしながら、コンポーネントキャリア単位での周波数帯域の変更では、無線リンク通信品質の周波数変動に対して十分に対応することが難しく、端末のスループットが低下する可能性がある。   A terminal that does not support the above-described carrier aggregation technology and performs radio communication using only one component carrier uses any one of a plurality of component carriers each having a defined frequency band. Therefore, the terminal can change the frequency band used for wireless communication in component carrier units. However, when the frequency band is changed in units of component carriers, it is difficult to sufficiently cope with the frequency fluctuation of the radio link communication quality, and the throughput of the terminal may be reduced.

また、ＭＴＣ端末では、使用可能な全周波数帯域のうち中心部分の周波数帯域しか使用できないので、無線リンク通信品質の周波数変動に対応することができず、端末のスループットが低下する可能性がある。   Further, since the MTC terminal can use only the central frequency band among all usable frequency bands, it cannot cope with the frequency fluctuation of the radio link communication quality, and the throughput of the terminal may be reduced.

本発明は、このような事情を考慮してなされたもので、無線端末装置が無線基地局装置の使用可能な全周波数帯域のうち一部の周波数帯域を無線通信に使用する際に、無線リンク通信品質の周波数変動に対応できる無線端末装置および無線基地局装置を提供することを課題とする。   The present invention has been made in consideration of such circumstances, and when a radio terminal apparatus uses a part of all frequency bands usable by a radio base station apparatus for radio communication, a radio link is provided. It is an object of the present invention to provide a radio terminal apparatus and a radio base station apparatus that can cope with frequency fluctuations in communication quality.

上記の課題を解決するために、本発明に係る無線端末装置は、無線基地局装置の使用可能な全周波数帯域のうち一部の周波数帯域を無線通信に使用する無線端末装置において、前記全周波数帯域のうちから任意の一部の周波数帯域を選択して無線通信に使用可能な無線部と、前記無線基地局装置から無線通信に使用する通信周波数帯域を示す情報を受信する通信制御部と、を備え、前記無線部は、前記無線基地局装置から通知された通信周波数帯域を使用して前記無線基地局装置と無線通信する、ことを特徴とする。   In order to solve the above problems, a radio terminal apparatus according to the present invention is a radio terminal apparatus that uses a part of all frequency bands that can be used by a radio base station apparatus for radio communication. A radio unit that can be used for radio communication by selecting any part of the frequency band from the band; a communication control unit that receives information indicating a communication frequency band used for radio communication from the radio base station device; The wireless unit performs wireless communication with the wireless base station device using a communication frequency band notified from the wireless base station device.

本発明に係る無線端末装置において、通信周波数帯域の初期値は、前記無線基地局装置が使用可能な複数のコンポーネントキャリアのうちの特定コンポーネントキャリアであり、前記特定コンポーネントキャリアにおける通信品質を測定する測定部を備え、前記通信制御部は、前記通信品質の測定結果を前記無線基地局装置へ通知し、該通知した通信品質の測定結果に基づいた通信周波数帯域を示す情報を前記無線基地局装置から受信する、ことを特徴とする。   In the wireless terminal device according to the present invention, an initial value of a communication frequency band is a specific component carrier among a plurality of component carriers that can be used by the wireless base station device, and measurement for measuring communication quality in the specific component carrier The communication control unit notifies the radio base station device of the communication quality measurement result, and transmits information indicating a communication frequency band based on the notified communication quality measurement result from the radio base station device. It is characterized by receiving.

本発明に係る無線端末装置において、前記特定コンポーネントキャリアは、前記全周波数帯域中の中心部分を含むことを特徴とする。   In the wireless terminal device according to the present invention, the specific component carrier includes a central portion in the entire frequency band.

本発明に係る無線端末装置において、前記通信周波数帯域を示す情報は、通信周波数帯域の中心周波数を示す情報であることを特徴とする。   In the wireless terminal device according to the present invention, the information indicating the communication frequency band is information indicating a center frequency of the communication frequency band.

本発明に係る無線基地局装置は、自無線基地局装置の使用可能な全周波数帯域のうち一部の周波数帯域のみを無線通信に使用する無線端末装置と無線通信する無線基地局装置において、使用可能な複数のコンポーネントキャリアのうちの特定コンポーネントキャリアにおける通信品質の測定結果を前記無線端末装置から受信する通信制御部と、前記受信された通信品質の測定結果に基づいて、前記全周波数帯域のうちから任意の一部の周波数帯域を、前記無線端末装置との無線通信に使用する通信周波数帯域に選択する通信周波数帯域選択部と、を備え、前記選択された通信周波数帯域を示す情報を前記無線端末装置へ送信することを特徴とする。   The radio base station apparatus according to the present invention is used in a radio base station apparatus that performs radio communication with a radio terminal apparatus that uses only a part of all usable frequency bands of the radio base station apparatus for radio communication. Based on the received communication quality measurement result, a communication control unit that receives a communication quality measurement result in a specific component carrier among a plurality of possible component carriers, and out of all the frequency bands A communication frequency band selecting unit that selects any one of the frequency bands as a communication frequency band to be used for wireless communication with the wireless terminal device, and information indicating the selected communication frequency band It transmits to a terminal device, It is characterized by the above-mentioned.

本発明によれば、無線端末装置が無線基地局装置の使用可能な全周波数帯域のうち一部の周波数帯域を無線通信に使用する際に、無線リンク通信品質の周波数変動に対応できるという効果が得られる。   Advantageous Effects of Invention According to the present invention, when a radio terminal apparatus uses a part of all frequency bands that can be used by a radio base station apparatus for radio communication, it is possible to cope with frequency fluctuations in radio link communication quality. can get.

本発明の一実施形態に係る端末（無線端末装置）１の構成を示すブロック図である。It is a block diagram which shows the structure of the terminal (wireless terminal device) 1 which concerns on one Embodiment of this invention. 本発明の一実施形態に係る基地局（無線基地局装置）２の構成を示すブロック図である。It is a block diagram which shows the structure of the base station (radio base station apparatus) 2 which concerns on one Embodiment of this invention. 本発明の一実施形態に係る無線通信制御処理のシーケンスチャートである。It is a sequence chart of the radio | wireless communication control process which concerns on one Embodiment of this invention. 本発明に係る通信周波数帯域設定方法の実施例１を説明するための説明図である。It is explanatory drawing for demonstrating Example 1 of the communication frequency band setting method which concerns on this invention. 本発明に係る通信周波数帯域設定方法の実施例２を説明するための説明図である。It is explanatory drawing for demonstrating Example 2 of the communication frequency band setting method which concerns on this invention.

以下、図面を参照し、本発明の実施形態について説明する。
図１は、本発明の一実施形態に係る端末（無線端末装置）１の構成を示すブロック図である。図２は、本発明の一実施形態に係る基地局（無線基地局装置）２の構成を示すブロック図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a terminal (wireless terminal apparatus) 1 according to an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of the base station (radio base station apparatus) 2 according to an embodiment of the present invention.

図１を参照して端末１を説明する。図１において、端末１は、無線部１０と測定部１１と通信制御部１２を備える。無線部１０は通信周波数帯域設定部１３を有する。無線部１０は、基地局２との間で無線通信を行う。無線部１０は、基地局２の使用可能な全周波数帯域のうち一部の周波数帯域を無線通信に使用する。無線部１０は、全周波数帯域のうちから任意の一部の周波数帯域を選択して無線通信に使用可能である。通信周波数帯域設定部１３は、無線通信に使用する通信周波数帯域の設定を行う。   The terminal 1 will be described with reference to FIG. In FIG. 1, the terminal 1 includes a radio unit 10, a measurement unit 11, and a communication control unit 12. The radio unit 10 includes a communication frequency band setting unit 13. The wireless unit 10 performs wireless communication with the base station 2. The radio unit 10 uses a part of the frequency bands that can be used by the base station 2 for radio communication. The wireless unit 10 can select any part of the frequency bands from the entire frequency band and use it for wireless communication. The communication frequency band setting unit 13 sets a communication frequency band used for wireless communication.

測定部１１は、無線部１０で受信された受信信号を用いて通信品質の測定を行う。通信品質としては、例えば、ＳＩＮＲ（Signal to Interference and Noise power Ratio）が挙げられる。通信制御部１２は、無線部１０を介して、基地局２との間でデータを送受する。   The measurement unit 11 measures communication quality using the reception signal received by the wireless unit 10. Examples of the communication quality include SINR (Signal to Interference and Noise power Ratio). The communication control unit 12 transmits / receives data to / from the base station 2 via the wireless unit 10.

図２を参照して基地局２を説明する。図２において、基地局２は、無線部２０と通信制御部２１と通信周波数帯域選択部２２を備える。無線部２０は、端末１との間で無線通信を行う。無線部２０は、基地局２の使用可能な全周波数帯域を無線通信に使用可能である。通信制御部２１は、無線部２０を介して、端末１との間でデータを送受する。通信周波数帯域選択部２２は、ある端末１と自基地局２との無線通信に使用する通信周波数帯域を選択する。   The base station 2 will be described with reference to FIG. In FIG. 2, the base station 2 includes a radio unit 20, a communication control unit 21, and a communication frequency band selection unit 22. The wireless unit 20 performs wireless communication with the terminal 1. The radio unit 20 can use all frequency bands available for the base station 2 for radio communication. The communication control unit 21 transmits / receives data to / from the terminal 1 via the wireless unit 20. The communication frequency band selection unit 22 selects a communication frequency band used for wireless communication between a certain terminal 1 and its own base station 2.

図３は、本実施形態に係る無線通信制御処理のシーケンスチャートである。以下、図３を参照して図１の端末１および図２の基地局２の動作を説明する。   FIG. 3 is a sequence chart of the wireless communication control process according to the present embodiment. Hereinafter, operations of the terminal 1 of FIG. 1 and the base station 2 of FIG. 2 will be described with reference to FIG.

（ステップＳ１）端末１の無線部１０は、ある通信周波数帯域を使用して基地局２と無線通信し、基地局２への所属（attach）を行う。所属に使用される通信周波数帯域としては、例えば、複数のコンポーネントキャリアのうち、同期チャネルを有するコンポーネントキャリアが挙げられる。又は、複数のコンポーネントキャリアが同期チャネルを有する場合において、受信信号の強度が最大であるコンポーネントキャリアが、所属に使用される通信周波数帯域として利用可能である。 (Step S1) The wireless unit 10 of the terminal 1 wirelessly communicates with the base station 2 using a certain communication frequency band and attaches to the base station 2. As a communication frequency band used for affiliation, for example, a component carrier having a synchronization channel among a plurality of component carriers can be cited. Alternatively, when a plurality of component carriers have a synchronization channel, the component carrier having the maximum received signal strength can be used as a communication frequency band used for belonging.

（ステップＳ２）基地局２の通信制御部２１は、所属された端末１に対して、通信品質の測定を指示する。 (Step S2) The communication control unit 21 of the base station 2 instructs the terminal 1 to which it belongs to measurement of communication quality.

（ステップＳ３）端末１の測定部１１は、無線部１０で受信された受信信号を用いて、基地局２と無線通信しているチャネルの通信品質（チャネル通信品質）を測定する。端末１の測定部１１は、無線部１０を介して、該チャネル通信品質の測定結果を基地局２へ通知する。 (Step S <b> 3) The measurement unit 11 of the terminal 1 measures the communication quality (channel communication quality) of the channel wirelessly communicating with the base station 2 using the received signal received by the wireless unit 10. The measurement unit 11 of the terminal 1 notifies the base station 2 of the measurement result of the channel communication quality via the radio unit 10.

（ステップＳ４）基地局２の通信制御部２１は、端末１から受信したチャネル通信品質の測定結果を通信周波数帯域選択部２２へ出力する。通信周波数帯域選択部２２は、そのチャネル通信品質の測定結果に基づいて、自基地局２の使用可能な全周波数帯域のうちから任意の一部の周波数帯域を、当該端末１と自基地局２との無線通信に使用する通信周波数帯域に選択する。通信周波数帯域選択部２２は、該選択した通信周波数帯域の中心周波数を通信制御部２１へ通知する。具体的には、通信周波数帯域選択部２２は、チャネル通信品質の測定結果に基づいてどの周波数帯域が当該端末１に最適であるかを判定し、この判定結果の周波数帯域の中心周波数を通信制御部２１へ通知する。 (Step S <b> 4) The communication control unit 21 of the base station 2 outputs the channel communication quality measurement result received from the terminal 1 to the communication frequency band selection unit 22. Based on the measurement result of the channel communication quality, the communication frequency band selection unit 22 selects an arbitrary partial frequency band from all the usable frequency bands of the own base station 2 and the terminal 1 and the own base station 2. Select the communication frequency band to be used for wireless communication. The communication frequency band selection unit 22 notifies the communication control unit 21 of the center frequency of the selected communication frequency band. Specifically, the communication frequency band selection unit 22 determines which frequency band is optimal for the terminal 1 based on the measurement result of the channel communication quality, and performs communication control on the center frequency of the frequency band of the determination result. Notification to the unit 21.

（ステップＳ５）基地局２の通信制御部２１は、通信周波数帯域選択部２２から通知された中心周波数を、無線部２０を介して端末１へ通知する。端末１の通信制御部１２は、無線部１０を介して、基地局２から中心周波数を示す情報を受信する。通信制御部１２は、該中心周波数を通信周波数帯域設定部１３へ通知する。通信周波数帯域設定部１３は、通信制御部１２から通知された中心周波数を、通信周波数帯域の中心周波数に設定する。これにより、無線部１０は、該設定された中心周波数を有する通信周波数帯域を使用して、基地局２との無線通信を行う。 (Step S5) The communication control unit 21 of the base station 2 notifies the terminal 1 of the center frequency notified from the communication frequency band selection unit 22 via the radio unit 20. The communication control unit 12 of the terminal 1 receives information indicating the center frequency from the base station 2 via the wireless unit 10. The communication control unit 12 notifies the communication frequency band setting unit 13 of the center frequency. The communication frequency band setting unit 13 sets the center frequency notified from the communication control unit 12 to the center frequency of the communication frequency band. Thereby, the wireless unit 10 performs wireless communication with the base station 2 using the communication frequency band having the set center frequency.

以下、本実施形態に係る通信周波数帯域設定方法の実施例を説明する。   Hereinafter, examples of the communication frequency band setting method according to the present embodiment will be described.

図４は本発明に係る通信周波数帯域設定方法の実施例１を説明するための説明図である。図４において、基地局２は、３つのコンポーネントキャリア１０１，１０２，１０３を使用可能である。例えば、一コンポーネントキャリアの周波数幅は１０ＭＨｚである。端末１は、１０ＭＨｚの周波数幅を有する一通信周波数帯域を使用して基地局２と無線通信する。   FIG. 4 is an explanatory diagram for explaining Example 1 of the communication frequency band setting method according to the present invention. In FIG. 4, the base station 2 can use three component carriers 101, 102, and 103. For example, the frequency width of one component carrier is 10 MHz. The terminal 1 wirelessly communicates with the base station 2 using one communication frequency band having a frequency width of 10 MHz.

ここでは、端末１は、周波数軸上で真ん中のコンポーネントキャリア１０２の同期チャネルを使用して基地局２との同期を取り、基地局２への所属を行うとする。したがって、端末１は、基地局２との同期時には、コンポーネントキャリア１０２と同じ通信周波数帯域２０１を使用して基地局２と無線通信する。端末１は、通信周波数帯域２０１における基地局２との無線通信に係るチャネル通信品質を測定し、該測定結果を基地局２へ通知する。   Here, it is assumed that the terminal 1 uses the synchronization channel of the middle component carrier 102 on the frequency axis to synchronize with the base station 2 and belongs to the base station 2. Therefore, the terminal 1 wirelessly communicates with the base station 2 using the same communication frequency band 201 as that of the component carrier 102 when synchronizing with the base station 2. The terminal 1 measures the channel communication quality related to wireless communication with the base station 2 in the communication frequency band 201 and notifies the base station 2 of the measurement result.

基地局２は、端末１によるチャネル通信品質の測定結果に基づいて、当該端末１に最適の周波数帯域の中心周波数を選択する。図４の例では、同期後の時刻ｔ１でのチャネル通信品質の測定結果に基づいて、周波数ｆ＿ａが中心周波数に選択されている。これにより、同期後の時刻ｔ１では、端末１は、中心周波数ｆ＿ａを有する通信周波数帯域２０２を使用して基地局２と無線通信する。また、同期後の時刻ｔ２でのチャネル通信品質の測定結果に基づいて、周波数ｆ＿ｂが中心周波数に選択されている。これにより、同期後の時刻ｔ２では、端末１は、中心周波数ｆ＿ｂを有する通信周波数帯域２０３を使用して基地局２と無線通信する。   The base station 2 selects the center frequency of the frequency band most suitable for the terminal 1 based on the measurement result of the channel communication quality by the terminal 1. In the example of FIG. 4, the frequency f_a is selected as the center frequency based on the measurement result of the channel communication quality at time t1 after synchronization. Thereby, at time t1 after synchronization, the terminal 1 performs radio communication with the base station 2 using the communication frequency band 202 having the center frequency f_a. Further, based on the measurement result of the channel communication quality at time t2 after synchronization, the frequency f_b is selected as the center frequency. Thereby, at time t2 after synchronization, the terminal 1 performs radio communication with the base station 2 using the communication frequency band 203 having the center frequency f_b.

上述したように実施例１によれば、端末１は、基地局２との同期後に、自己に適した通信周波数帯域を用いて基地局２と無線通信を行うことができる。該通信周波数帯域には、コンポーネントキャリアに限定されず、基地局２の使用可能な全周波数帯域のうちから任意の一部の周波数帯域を選択可能である。これにより、無線リンク通信品質の周波数変動に対応できるという効果が得られる。   As described above, according to the first embodiment, the terminal 1 can perform wireless communication with the base station 2 using a communication frequency band suitable for itself after synchronization with the base station 2. The communication frequency band is not limited to the component carrier, and any part of the frequency band that can be used by the base station 2 can be selected. Thereby, the effect that it can respond to the frequency fluctuation of radio link communication quality is acquired.

図５は本発明に係る通信周波数帯域設定方法の実施例２を説明するための説明図である。図５において、基地局２は、全周波数帯域１１０を使用可能である。端末１は、全周波数帯域１１０のうち所定数の無線リソース単位（リソースブロック：ＲＢ）を使用して基地局２と無線通信する。   FIG. 5 is an explanatory diagram for explaining a second embodiment of the communication frequency band setting method according to the present invention. In FIG. 5, the base station 2 can use the entire frequency band 110. The terminal 1 wirelessly communicates with the base station 2 using a predetermined number of radio resource units (resource block: RB) in the entire frequency band 110.

ここでは、端末１は、周波数軸上で真ん中のＲＢを有する周波数帯域１１１の同期チャネルを使用して基地局２との同期を取り、基地局２への所属を行うとする。したがって、端末１は、基地局２との同期時には、周波数帯域１１１と同じ通信周波数帯域２１１を使用して基地局２と無線通信する。端末１は、通信周波数帯域２１１における基地局２との無線通信に係るチャネル通信品質を測定し、該測定結果を基地局２へ通知する。   Here, it is assumed that the terminal 1 uses the synchronization channel of the frequency band 111 having the middle RB on the frequency axis to synchronize with the base station 2 and belong to the base station 2. Therefore, the terminal 1 wirelessly communicates with the base station 2 using the same communication frequency band 211 as the frequency band 111 when synchronized with the base station 2. The terminal 1 measures the channel communication quality related to the wireless communication with the base station 2 in the communication frequency band 211 and notifies the base station 2 of the measurement result.

基地局２は、端末１によるチャネル通信品質の測定結果に基づいて、当該端末１に最適の周波数帯域の中心周波数を選択する。図５の例では、同期後の時刻ｔ１でのチャネル通信品質の測定結果に基づいて、周波数ｆ＿ｃが中心周波数に選択されている。これにより、同期後の時刻ｔ１では、端末１は、中心周波数ｆ＿ｃを有する通信周波数帯域２１２を使用して基地局２と無線通信する。また、同期後の時刻ｔ２でのチャネル通信品質の測定結果に基づいて、周波数ｆ＿ｄが中心周波数に選択されている。これにより、同期後の時刻ｔ２では、端末１は、中心周波数ｆ＿ｄを有する通信周波数帯域２１３を使用して基地局２と無線通信する。   The base station 2 selects the center frequency of the frequency band most suitable for the terminal 1 based on the measurement result of the channel communication quality by the terminal 1. In the example of FIG. 5, the frequency f_c is selected as the center frequency based on the measurement result of the channel communication quality at time t1 after synchronization. Thereby, at the time t1 after synchronization, the terminal 1 performs radio communication with the base station 2 using the communication frequency band 212 having the center frequency f_c. Further, the frequency f_d is selected as the center frequency based on the measurement result of the channel communication quality at time t2 after synchronization. Accordingly, at time t2 after synchronization, the terminal 1 performs radio communication with the base station 2 using the communication frequency band 213 having the center frequency f_d.

上述したように実施例２によれば、端末１は、基地局２との同期後に、自己に適した通信周波数帯域を用いて基地局２と無線通信を行うことができる。該通信周波数帯域には、コンポーネントキャリアに限定されず、基地局２の使用可能な全周波数帯域のうちから任意の一部の周波数帯域を選択可能である。これにより、無線リンク通信品質の周波数変動に対応できるという効果が得られる。   As described above, according to the second embodiment, the terminal 1 can perform wireless communication with the base station 2 using a communication frequency band suitable for itself after synchronization with the base station 2. The communication frequency band is not limited to the component carrier, and any part of the frequency band that can be used by the base station 2 can be selected. Thereby, the effect that it can respond to the frequency fluctuation of radio link communication quality is acquired.

以上、本発明の実施形態について図面を参照して詳述してきたが、具体的な構成はこの実施形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計変更等も含まれる。
例えば、ＦＤＤ（Frequency Division Duplex）の場合には、ダウンリンク（基地局から端末に向かう方向の無線リンク）と、アップリンク（端末から基地局に向かう方向の無線リンク）とで、独立に、通信周波数帯域の中心周波数を設定してもよい。 As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, in the case of FDD (Frequency Division Duplex), communication is performed independently on the downlink (radio link in the direction from the base station to the terminal) and on the uplink (radio link in the direction from the terminal to the base station). You may set the center frequency of a frequency band.

また、本発明は、ＬＴＥ規格の無線通信システム等、様々な無線通信システムに適用可能である。また、ＭＴＣ端末にも適用できる。   In addition, the present invention can be applied to various wireless communication systems such as LTE wireless communication systems. It can also be applied to MTC terminals.

１…端末（無線端末装置）、２…基地局（無線基地局装置）、１０，２０…無線部、１１…測定部、１２…通信制御部、１３…通信周波数帯域設定部、２１…通信制御部、２２…通信周波数帯域選択部 DESCRIPTION OF SYMBOLS 1 ... Terminal (wireless terminal device), 2 ... Base station (wireless base station device), 10, 20 ... Radio | wireless part, 11 ... Measuring part, 12 ... Communication control part, 13 ... Communication frequency band setting part, 21 ... Communication control Part, 22 ... communication frequency band selection part

Claims (5)

無線基地局装置の使用可能な全周波数帯域のうち一部の周波数帯域を無線通信に使用する無線端末装置において、
前記全周波数帯域のうちから任意の一部の周波数帯域を選択して無線通信に使用可能な無線部と、
前記無線基地局装置から無線通信に使用する通信周波数帯域を示す情報を受信する通信制御部と、を備え、
前記無線部は、前記無線基地局装置から通知された通信周波数帯域を使用して前記無線基地局装置と無線通信する、
ことを特徴とする無線端末装置。 In a wireless terminal device that uses a part of the available frequency bands of the wireless base station device for wireless communication,
A radio unit that can be used for radio communication by selecting any part of the frequency bands from the entire frequency band, and
A communication control unit that receives information indicating a communication frequency band used for wireless communication from the wireless base station device,
The wireless unit wirelessly communicates with the wireless base station device using a communication frequency band notified from the wireless base station device;
A wireless terminal device. 通信周波数帯域の初期値は、前記無線基地局装置が使用可能な複数のコンポーネントキャリアのうちの特定コンポーネントキャリアであり、
前記特定コンポーネントキャリアにおける通信品質を測定する測定部を備え、
前記通信制御部は、前記通信品質の測定結果を前記無線基地局装置へ通知し、該通知した通信品質の測定結果に基づいた通信周波数帯域を示す情報を前記無線基地局装置から受信する、
ことを特徴とする請求項１に記載の無線端末装置。 The initial value of the communication frequency band is a specific component carrier among a plurality of component carriers that can be used by the radio base station device,
A measurement unit for measuring communication quality in the specific component carrier;
The communication control unit notifies the radio base station apparatus of the measurement result of the communication quality, and receives information indicating a communication frequency band based on the notified measurement result of the communication quality from the radio base station apparatus.
The wireless terminal device according to claim 1. 前記特定コンポーネントキャリアは、前記全周波数帯域中の中心部分を含むことを特徴とする請求項２に記載の無線端末装置。   The wireless terminal apparatus according to claim 2, wherein the specific component carrier includes a central portion in the entire frequency band. 前記通信周波数帯域を示す情報は、通信周波数帯域の中心周波数を示す情報であることを特徴とする請求項１から３のいずれか１項に記載の無線端末装置。   The wireless terminal device according to any one of claims 1 to 3, wherein the information indicating the communication frequency band is information indicating a center frequency of the communication frequency band. 自無線基地局装置の使用可能な全周波数帯域のうち一部の周波数帯域のみを無線通信に使用する無線端末装置と無線通信する無線基地局装置において、
使用可能な複数のコンポーネントキャリアのうちの特定コンポーネントキャリアにおける通信品質の測定結果を前記無線端末装置から受信する通信制御部と、
前記受信された通信品質の測定結果に基づいて、前記全周波数帯域のうちから任意の一部の周波数帯域を、前記無線端末装置との無線通信に使用する通信周波数帯域に選択する通信周波数帯域選択部と、を備え、
前記選択された通信周波数帯域を示す情報を前記無線端末装置へ送信することを特徴とする無線基地局装置。 In a radio base station apparatus that performs radio communication with a radio terminal apparatus that uses only some of the frequency bands that can be used by the own radio base station apparatus for radio communication
A communication control unit that receives a measurement result of communication quality in a specific component carrier among a plurality of usable component carriers from the wireless terminal device;
Based on the received communication quality measurement result, a communication frequency band selection for selecting any one of the frequency bands as a communication frequency band to be used for wireless communication with the wireless terminal device And comprising
A radio base station apparatus that transmits information indicating the selected communication frequency band to the radio terminal apparatus.
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