JP2009112006A - Cognitive radio communication device using overlapped signal and method thereof - Google Patents
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Abstract
Description
本発明はコグニティブ無線技術に関し、特に、第１ネットワークの第１信号が存在するか否かを判断するコグニティブ無線通信装置およびその方法に関するものである。 The present invention relates to cognitive radio technology, and more particularly, to a cognitive radio communication apparatus and method for determining whether or not a first signal of a first network exists.
最近、限定された周波数リソースを効率的に使用できる技術に関する様々な研究が活発に行われている。その中、最も目立つ技術中の１つがコグニティブ無線（Ｃｏｇｎｉｔｉｖｅ Ｒａｄｉｏ、ＣＲ）技術である。
コグニティブ無線技術は限定された周波数リソースを再活用してより効率的に周波数リソースを使う技術である。すなわち、コグニティブ無線技術によれば、第２ネットワークに属する通信装置は第１ネットワークで使われない周波数リソースを周期的または非周期的にセンシング（Ｓｅｎｓｉｎｇ）して使用可能な周波数リソースを認知し、認知された使用可能な周波数リソースを利用してデータを送／受信する。
Recently, various studies on technologies that can efficiently use limited frequency resources have been actively conducted. Among them, one of the most prominent technologies is the cognitive radio (CR) technology.
Cognitive radio technology is a technology that reuses limited frequency resources and uses frequency resources more efficiently. That is, according to the cognitive radio technology, a communication device belonging to the second network senses a usable frequency resource by sensing frequency resources that are not used in the first network periodically or aperiodically (Sensing). Data is transmitted / received using the available frequency resources.
但し、使用可能な周波数リソースに対して第１ネットワークが優先権限を有するため、第２ネットワークの信号と第１ネットワークの信号が衝突する心配がある場合、第２ネットワークの通信装置は通信動作を停止するか、使用中の周波数リソースを変更しなければならない。 However, since the first network has priority authority over the usable frequency resources, the communication device of the second network stops the communication operation when there is a concern that the signal of the second network and the signal of the first network collide. Or change the frequency resource in use.
よって、第２ネットワークに属する通信装置は第１ネットワークの信号が存在するか否かを把握しなければならない。この時、第２ネットワークに属する通信装置が第１ネットワークの信号が存在するか否かを把握するために長すぎるセンシング区間を置くのは非効率的である。
従って、センシング区間を無くすか、センシング区間を短くしても、第１ネットワークの信号が存在するか否かを効率的に判断できる技術が必要である。
Therefore, the communication device belonging to the second network must grasp whether or not the signal of the first network exists. At this time, it is inefficient to place a sensing section that is too long for the communication device belonging to the second network to grasp whether or not the signal of the first network exists.
Therefore, there is a need for a technique that can efficiently determine whether or not there is a signal of the first network even if the sensing interval is eliminated or the sensing interval is shortened.
本発明は、第２信号において同一信号が繰り返される重複部分に含まれた信号の間の同一性を利用して第１信号が存在するか否かを判断することにより、付加的なハードウェアリソースおよび無線リソースを必要としないコグニティブ無線通信装置およびその方法を提供する。 The present invention provides additional hardware resources by determining whether the first signal exists using the identity between signals included in overlapping portions where the same signal is repeated in the second signal. A cognitive radio communication apparatus that does not require radio resources and a method thereof are provided.
また、本発明は、重複時間区間中に受信された信号の差を利用して第１信号が存在するか否かを判断することにより、より効率的にコグニティブ無線技術を活用できるコグニティブ無線通信装置およびその方法を提供する。
また、本発明は、センシング区間を置くことにより、より正確に第１信号の存在を認知するだけでなく、重複時間区間中に受信された信号の差を利用して第１信号が存在するか否かを判断することにより、通信システムのデータ転送率を極大化できるコグニティブ無線通信装置およびその方法を提供する。
In addition, the present invention provides a cognitive radio communication apparatus that can more efficiently utilize the cognitive radio technology by determining whether or not the first signal exists by using a difference between signals received during the overlapping time interval. And a method thereof.
In addition, the present invention not only recognizes the presence of the first signal more accurately by placing the sensing interval, but also uses the difference between the signals received during the overlapping time interval to determine whether the first signal exists. By determining whether or not, a cognitive radio communication apparatus and method for maximizing the data transfer rate of a communication system are provided.
本発明の一実施形態に係るコグニティブ無線通信装置は、第１ネットワークの第１信号および第２ネットワークの第２信号を受信する信号受信部（前記第２信号は同一信号が繰り返される２つ以上の重複部分を含む）と、前記重複部分に含まれた信号の間の同一性を利用して前記第１信号の存在と関わる状態情報を生成する状態情報生成部、および前記状態情報に基づいて前記第２ネットワークに属する通信装置の通信動作モードを決定する動作モード決定部を含む。 A cognitive radio communication apparatus according to an embodiment of the present invention includes a signal receiving unit that receives a first signal of a first network and a second signal of a second network (the second signal includes two or more of which the same signal is repeated). A state information generation unit that generates state information related to the presence of the first signal using the identity between the signals included in the overlap portion, and the state information based on the state information An operation mode determination unit that determines a communication operation mode of a communication device belonging to the second network is included.
また、本発明の一実施形態に係るコグニティブ無線通信装置は、第１ネットワークの第１信号および第２ネットワークの第２信号を受信する信号受信部（前記第２信号は同一信号が繰り返される２つ以上の重複部分を含む）と、前記重複部分に含まれた重複信号および前記第１信号をセンシングするセンシング区間中に受信したセンシング信号を利用して前記第１信号の存在と関わる状態情報を生成する状態情報生成部、および前記状態情報に基づいて前記第２ネットワークに属する通信装置の通信動作モードを決定する動作モード決定部を含む。 The cognitive radio communication apparatus according to an embodiment of the present invention also includes a signal receiving unit that receives the first signal of the first network and the second signal of the second network (the second signal includes two repeated identical signals). And the state information related to the presence of the first signal is generated using the overlapping signal included in the overlapping portion and the sensing signal received during the sensing period for sensing the first signal. A state information generation unit that performs the operation, and an operation mode determination unit that determines a communication operation mode of a communication device belonging to the second network based on the state information.
また、本発明の一実施形態に係るコグニティブ無線通信方法は、第１ネットワークの第１信号および第２ネットワークの第２信号を受信するステップ（前記第２信号は同一信号が繰り返される２つ以上の重複部分を含む）と、前記重複部分に含まれた信号の間の同一性を利用して前記第１信号の存在と関わる状態情報を生成するステップ、および前記状態情報に基づいて前記第２ネットワークに属する通信装置の通信動作モードを決定するステップを含む。 In addition, the cognitive radio communication method according to an embodiment of the present invention includes a step of receiving a first signal of a first network and a second signal of a second network (the second signal includes two or more repetitions of the same signal). And generating state information related to the presence of the first signal using the identity between the signals included in the overlapping portion and the second network based on the state information Determining a communication operation mode of a communication device belonging to
また、本発明の一実施形態に係るコグニティブ無線通信方法は、第１ネットワークの第１信号および第２ネットワークの第２信号を受信するステップ（前記第２信号は同一信号が繰り返される２つ以上の重複部分を含む）と、前記重複部分に含まれた重複信号および前記第１信号をセンシングするセンシング区間中に受信したセンシング信号を利用して前記第１信号の存在と関わる状態情報を生成するステップ、および前記状態情報に基づいて前記第２ネットワークに属する通信装置の通信動作モードを決定するステップを含む。 In addition, the cognitive radio communication method according to an embodiment of the present invention includes a step of receiving a first signal of a first network and a second signal of a second network (the second signal includes two or more repetitions of the same signal). Generating state information related to the presence of the first signal using the overlapping signal included in the overlapping portion and the sensing signal received during the sensing period for sensing the first signal. And determining a communication operation mode of a communication device belonging to the second network based on the state information.
本発明は、第２信号において同一信号が繰り返される重複部分に含まれた信号の間の同一性を利用して第１信号が存在するか否かを判断することにより、付加的なハードウェアリソースおよび無線リソースを必要としないコグニティブ無線通信装置およびその方法を提供することができる。 The present invention provides additional hardware resources by determining whether the first signal exists using the identity between signals included in overlapping portions where the same signal is repeated in the second signal. In addition, a cognitive radio communication apparatus that does not require radio resources and a method thereof can be provided.
また、本発明は、重複時間区間中に受信された信号の差を利用して第１信号が存在するか否かを判断することにより、より効率的にコグニティブ無線技術を活用するコグニティブ無線通信装置およびその方法を提供することができる。 In addition, the present invention provides a cognitive radio communication apparatus that utilizes cognitive radio technology more efficiently by determining whether or not the first signal exists by using a difference between signals received during the overlapping time interval. And a method thereof.
また、本発明は、センシング区間を置くことにより、より正確に第１信号の存在を認知するだけでなく、重複時間区間中に受信された信号の差を利用して第１信号が存在するか否かを判断することにより、通信システムのデータ転送率を極大化するコグニティブ無線通信装置およびその方法を提供することができる。 In addition, the present invention not only recognizes the presence of the first signal more accurately by placing the sensing interval, but also uses the difference between the signals received during the overlapping time interval to determine whether the first signal exists. By determining whether or not, it is possible to provide a cognitive radio communication apparatus and method for maximizing the data transfer rate of the communication system.
以下、本発明に係る望ましい実施形態を添付図面に基づいて詳細に説明する。
図１は本発明の第１ネットワークおよび第２ネットワークの一例を示す図である。
図１を参照すれば、第１ネットワークは第１基地局および第１端末を含み、第２ネットワークは第２基地局および第２端末を含む。この時、第２基地局および第２端末は直交周波数分割多重接続（ＯＦＤＭ、Ｏｒｔｈｏｇｏｎａｌ Ｆｒｅｑｕｅｎｃｙ Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅｘｉｎｇ）方式の信号を送／受信することができる。
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a diagram showing an example of a first network and a second network of the present invention.
Referring to FIG. 1, the first network includes a first base station and a first terminal, and the second network includes a second base station and a second terminal. At this time, the second base station and the second terminal can transmit / receive a signal of an OFDM (Orthogonal Frequency Division Multiplexing) scheme.
この時、本発明のコグニティブ無線通信装置は第２端末または第２基地局に設けられて動作することができる。
この時、第２端末または第２基地局は第１ネットワークに割り当てられた周波数リソースのうちの一部または全部をコグニティブ無線技術を利用して使用可能な周波数リソースとして認知することができる。また、第２端末または第２基地局は認知された使用可能な周波数リソースを利用して第２信号を互いに送／受信することができる。
At this time, the cognitive radio communication apparatus of the present invention can be provided and operated in the second terminal or the second base station.
At this time, the second terminal or the second base station can recognize part or all of the frequency resources allocated to the first network as usable frequency resources using the cognitive radio technology. Also, the second terminal or the second base station can transmit / receive the second signal to / from each other using the recognized available frequency resources.
すなわち、第２端末が使用可能な周波数リソースを利用してアップリンク（ｕｐ−ｌｉｎｋ）時間において第２信号を第２基地局に転送することができ、第２基地局が使用可能な周波数リソースを利用してダウンリンク（ｄｏｗｎ−ｌｉｎｋ）時間において第２信号を第２端末に転送することができる。但し、第１端末または第１基地局は、第２端末または第２基地局が信号を送／受信しているか否かを考慮することなく、独立して予め割り当てられた周波数リソースを使うことができる。
この時、第２基地局または第２端末から転送された第２信号は第１端末または第１基地局に受信され得る。よって、第２信号によって第１端末または第１基地局に干渉が発生し得る。
That is, it is possible to transfer the second signal to the second base station in the uplink (up-link) time using the frequency resources that can be used by the second terminal, and the frequency resources that can be used by the second base station. The second signal can be transmitted to the second terminal in a downlink-link time. However, the first terminal or the first base station may use frequency resources allocated in advance independently without considering whether the second terminal or the second base station transmits / receives a signal. it can.
At this time, the second signal transferred from the second base station or the second terminal can be received by the first terminal or the first base station. Therefore, interference may occur in the first terminal or the first base station due to the second signal.
但し、第２端末または第２基地局が使用可能な周波数リソースを使用中であっても、第１基地局または第１端末がその使用可能な周波数リソースに対する優先権限を有し得る。この時、第２基地局または第２端末は使用中の使用可能な周波数リソースを変更するか、通信動作を停止しなければならない。よって、第２端末または第２基地局は第１端末または第１基地局から転送された第１信号の存在有無を把握する必要がある。 However, even when the frequency resource that can be used by the second terminal or the second base station is being used, the first base station or the first terminal may have priority authority for the frequency resource that can be used. At this time, the second base station or the second terminal must change the available frequency resource in use or stop the communication operation. Therefore, the second terminal or the second base station needs to grasp the presence or absence of the first signal transferred from the first terminal or the first base station.
図２は本発明の一実施形態により時間に対してセンシング区間および第２信号を示す図である。
図２を参照すれば、コグニティブ無線通信装置はセンシング区間ＮＤ中に第１ネットワークの第１信号を受信する。図２につき、本発明のコグニティブ無線通信装置が第２端末または第２基地局に設けられていると仮定して記述する。
FIG. 2 is a diagram illustrating a sensing interval and a second signal with respect to time according to an embodiment of the present invention.
Referring to FIG. 2, the cognitive radio communication device receives the first signal of the first network during a sensing interval N D. FIG. 2 is described assuming that the cognitive radio communication apparatus of the present invention is provided in the second terminal or the second base station.
第２端末または第２基地局はセンシング区間ＮＤ中にデータを送／受信する通信動作を停止し、第１信号を受信する。この時、センシング区間ＮＤが長くなるほど第１信号の存在有無を正確に判断することができるが、センシング区間ＮＤ中に第２端末または第２基地局がデータを送／受信する通信動作が停止するため、通信システム全体のデータ転送率は減少し得る。
よって、センシング区間ＮＤの長さを適切に調節して第１信号の存在有無を正確に判断しながらも、高い通信システム全体のデータ転送率を達成する必要がある。
The second terminal or the second base station stops a communication operation for transmitting / receiving data during the sensing interval N D, it receives the first signal. At this time, although the presence or absence of the first signal as the sensing period N D becomes long can be accurately determined, the communication operation of the second terminal or the second base station during the sensing interval N D is transmitting / receiving data Because it stops, the data transfer rate of the entire communication system can be reduced.
Therefore, while accurately determine the existence or non-existence of the first signal by appropriately adjusting the length of the sensing period N D, it is necessary to achieve a data transfer rate of the entire high communication system.
また、第２端末または第２基地局はセンシング区間ＮＤの後に第２信号を受信する。この時、図２には示されていないが、第１信号が存在する場合、第２端末または第２基地局は第１信号をセンシング区間の後にも受信することができる。 The second terminal or the second base station receives the second signal after the sensing period N D. At this time, although not shown in FIG. 2, when the first signal exists, the second terminal or the second base station can receive the first signal after the sensing period.
また、第２信号は直交周波数分割多重接続方式で符号化された信号でありうる。この時、第２信号はサイクリックプレフィックス（Ｃｙｃｌｉｃ Ｐｒｅｆｉｘ、ＣＰ）およびプリアンブル（ｐｒｅａｍｂｌｅ）信号を含むことができる。 The second signal may be a signal encoded by an orthogonal frequency division multiple access method. At this time, the second signal may include a cyclic prefix (CP) and a preamble signal.
サイクリックプレフィックスは一般的に第２信号のデータフレームのうちの開始部分に挿入される。この時、サイクリックプレフィックスは第２信号のデータフレームのうちの最後部分の信号がコピーされて開始部分に挿入されるため、第２信号のデータ開始部分の信号と最後部分の信号は同一である。すなわち、第２信号がサイクリックプレフィックスを含む場合、第２信号は同一信号が繰り返される２つ以上の重複部分を含む。 The cyclic prefix is generally inserted at the beginning of the data frame of the second signal. At this time, since the signal of the last part of the data frame of the second signal is copied and inserted into the start part of the cyclic prefix, the signal of the data start part of the second signal and the signal of the last part are the same. . That is, when the second signal includes a cyclic prefix, the second signal includes two or more overlapping portions where the same signal is repeated.
また、プリアンブル信号はパケット同期（ｓｙｎｃｈｒｏｎｉｚａｔｉｏｎ）と関わるシンボル、チャネル推定と関わるシンボル、フレーム同期のためのシンボルなどを含むことができる。この時、サイクリックプレフィックスと同じように、プリアンブル信号は同一信号が繰り返される２つ以上の重複部分を含むことができる。 In addition, the preamble signal may include a symbol related to packet synchronization, a symbol related to channel estimation, a symbol for frame synchronization, and the like. At this time, like the cyclic prefix, the preamble signal may include two or more overlapping portions where the same signal is repeated.
つまり、図２において、重複時間区間ＮＧ１および重複時間区間ＮＧ２には同一信号が繰り返し存在する。この時、重複時間区間ＮＧ１および重複時間区間ＮＧ２の長さは同一でありうる。
よって、第２信号はサイクリックプレフィックスおよびプリアンブル信号のうちの一部分と同じように同一信号が繰り返される重複部分を含む。但し、図２においては２つの重複部分だけが示されているが、本発明の一実施形態によれば、重複部分は２つ以上存在することができる。
That is, in FIG. 2, the same signal is repeatedly present in the overlapping time interval NG1 and the overlapping time interval NG2 . At this time, the lengths of the overlapping time interval NG1 and the overlapping time interval NG2 may be the same.
Therefore, the second signal includes an overlapping portion in which the same signal is repeated in the same manner as a portion of the cyclic prefix and the preamble signal. However, although only two overlapping portions are shown in FIG. 2, according to an embodiment of the present invention, there may be two or more overlapping portions.
また、第２端末または第２基地局は時間区間ＮＥ＋ＮＧ２中に有効信号部分を受信する。
この時、第１信号が存在する場合、第２端末または第２基地局が重複時間区間（ＮＧ１、ＮＧ２）中に第２信号の重複部分に含まれた信号だけでなく、第１信号を受信することができる。
Also, the second terminal or the second base station receives the valid signal part during the time interval N E + N G 2.
At this time, when the first signal is present, the second terminal or the second base station not only receives the signal included in the overlapping portion of the second signal during the overlapping time interval (N G1 , N G2 ), but also the first signal. Can be received.
例えば、第２端末または第２基地局が重複時間区間ＮＧ１中に受信した信号をＲ１、重複部分に含まれた信号をＸ、重複時間区間ＮＧ１に相応する第１信号をＹ１とすると、Ｒ１は下記式（１）のように表すことができる。 For example, a signal received by the second terminal or the second base station during the overlapping time interval N G1 is R 1 , a signal included in the overlapping portion is X, and a first signal corresponding to the overlapping time interval N G1 is Y 1 . Then, R 1 can be expressed as the following formula (1).
Ｒ１＝Ｘ＋Ｙ１ （１） R 1 = X + Y 1 (1)
また、第２端末または第２基地局が重複時間区間ＮＧ２中に受信した信号をＲ２、重複部分に含まれた信号をＸ、重複時間区間ＮＧ２に相応する第１信号をＹ２とすると、Ｒ２は下記式（２）のように表すことができる。この時、第２端末または第２基地局が重複時間区間ＮＧ１中に受信した信号と重複時間区間ＮＧ２中に受信した信号は同一であり、Ｘで表すことができる。 Further, the signal received by the second terminal or the second base station during the overlapping time interval N G2 is R 2 , the signal included in the overlapping portion is X, and the first signal corresponding to the overlapping time interval N G2 is Y 2 . Then, R 2 can be expressed as in the following formula (2). At this time, signal the second terminal or the second base station receives in signal overlap time interval N G2 received during interval N G1 overlap time is the same, it can be represented by X.
Ｒ２＝Ｘ＋Ｙ２ （２） R 2 = X + Y 2 (2)
前記式（１）および前記式（２）を参照すれば、Ｒ１およびＲ２に共通に含まれた信号はＸである。この時、前記式（２）と前記式（１）の差は下記式（３）のように表すことができる。 Referring to the equations (1) and (2), the signal commonly included in R 1 and R 2 is X. At this time, the difference between the formula (2) and the formula (1) can be expressed as the following formula (3).
Ｒ２−Ｒ１＝Ｙ２−Ｙ１
（３）
R 2 -R 1 = Y 2 -Y 1
(3)
前記式（３）を参照すれば、Ｒ２およびＲ１の差は第２信号の重複部分と関わる成分は含まず、単に第１信号の成分だけを含む。この時、Ｙ２とＹ１が等しい確率は非常に低いため、Ｒ２とＲ１の差を利用して第１信号が存在するか否かが判断することができる。
すなわち、Ｒ２とＲ１の差が予め定められた閾値より大きいか否かによって第１信号が存在するか否かを判断することができる。
Referring to Equation (3), the difference between R 2 and R 1 does not include the component related to the overlapping portion of the second signal, but includes only the component of the first signal. At this time, since the probability that Y 2 and Y 1 are equal is very low, it is possible to determine whether or not the first signal exists using the difference between R 2 and R 1 .
That is, whether or not the first signal exists can be determined based on whether or not the difference between R 2 and R 1 is greater than a predetermined threshold.
図３は本発明の一実施形態に係るコグニティブ無線通信装置を示すブロック図である。
図３を参照すれば、コグニティブ無線通信装置は信号受信部３１０、状態情報生成部３２０、および動作モード決定部３３０を含む。
FIG. 3 is a block diagram showing a cognitive radio communication apparatus according to an embodiment of the present invention.
Referring to FIG. 3, the cognitive radio communication apparatus includes a
信号受信部３１０は第１ネットワークの第１信号および第２ネットワークの第２信号を受信する。この時、第２信号は同一信号が繰り返される２つ以上の重複部分を含む。特に、第２信号は直交周波数分割多重接続方式の信号であり、サイクリックプレフィックスまたはプリアンブルを含むことができる。
The
状態情報生成部３２０は重複部分に含まれた信号の間の同一性を利用して第１信号の存在と関わる状態情報を生成する。この時、状態情報生成部３２０は重複部分に相応する重複時間区間中に受信された信号の差に基づいて状態情報を生成することができる。
この時、状態情報生成部３２０は１次信号をセンシングするセンシング区間中に受信したセンシング信号をさらに考慮して状態情報を生成することができる。
The state
At this time, the state
すなわち、本発明の一実施形態に係るコグニティブ無線通信装置はセンシング区間がなくても状態情報を生成することができるが、センシング区間を利用してより正確な状態情報を生成することもできる。 That is, the cognitive radio communication apparatus according to an embodiment of the present invention can generate state information without a sensing interval, but can also generate more accurate state information using the sensing interval.
例えば、前記式（３）を参照して、センシング区間中に受信したセンシング信号をＺ、重複時間区間ＮＧ１中に受信した信号をＲ１、重複時間区間ＮＧ２中に受信した信号をＲ２と仮定する。この時、センシング区間中に第２信号は生成されないため、センシング信号Ｚは第１信号の一部分である確率が高い。Ｒ２およびＲ１の差とセンシング信号を足すと下記式（４）のように表すことができる。 For example, with reference to the equation (3), a sensing signal received during the sensing interval Z, the signal received during overlapping time intervals N G1 R 1, a signal received in overlapping time interval N G2 R 2 Assume that At this time, since the second signal is not generated during the sensing period, there is a high probability that the sensing signal Z is a part of the first signal. When the difference between R 2 and R 1 and the sensing signal are added, it can be expressed as the following equation (4).
Ｔ＝Ｚ＋Ｒ２−Ｒ１＝Ｚ＋Ｙ２−Ｙ１ （４） T = Z + R 2 −R 1 = Z + Y 2 −Y 1 (4)
前記式（４）において、第１信号が存在せず、ノイズが存在しない理想的な状況である場合にＴは「０」になる。但し、第１信号が存在すると、一般的に特定レベル以上にＴが計算される。よって、Ｔを状態情報とすると、状態情報Ｔが予め定められた閾値より大きいか否かによって第１信号の存在有無を判断することができる。 In the equation (4), T is “0” in the ideal situation where the first signal does not exist and noise does not exist. However, if the first signal is present, T is generally calculated to exceed a specific level. Therefore, if T is state information, the presence or absence of the first signal can be determined based on whether or not the state information T is larger than a predetermined threshold.
また、動作モード決定部３３０は状態情報に基づいて第２ネットワークに属する通信装置の通信動作モードを決定する。この時、動作モード決定部３３０は状態情報と予め定められた閾値とを比較し、比較結果を用いて通信動作モードを決定することができる。
Further, the operation
例えば、重複部分に相応する重複時間区間中に受信された信号の差が閾値より大きい場合、動作モード決定部３３０は第１信号が存在すると判断して、第２ネットワークに属する通信装置の動作モードを決定することができる。
For example, when the difference between the signals received during the overlapping time interval corresponding to the overlapping portion is larger than the threshold, the operation
この時、動作モード決定部３３０は、第２ネットワークに属する装置が使用中の周波数リソースを変更する第１通信動作モード、通信装置が通信動作を停止する第２通信動作モード、または通信装置が遂行中である通信動作を維持する第３通信動作モードのうちのいずれか１つを通信動作モードに決定することができる。
At this time, the operation
図４は本発明の一実施形態に係るコグニティブ無線通信方法を示す動作フローチャートである。
図４を参照すれば、本発明の一実施形態に係るコグニティブ無線通信方法は、第１信号および第２信号を受信する（Ｓ４１０）。
FIG. 4 is an operation flowchart illustrating a cognitive radio communication method according to an embodiment of the present invention.
Referring to FIG. 4, the cognitive radio communication method according to an embodiment of the present invention receives a first signal and a second signal (S410).
その次、本発明の一実施形態に係るコグニティブ無線通信方法は、第１信号をセンシングするセンシング区間を利用して受信したセンシング信号を検出する（Ｓ４２０）。 Then, the cognitive radio communication method according to the embodiment of the present invention detects the received sensing signal using the sensing section for sensing the first signal (S420).
その次、本発明の一実施形態に係るコグニティブ無線通信方法は、重複部分に相応する重複時間区間中に受信された信号を検出する（Ｓ４３０）。 Next, the cognitive radio communication method according to an embodiment of the present invention detects a signal received during an overlapping time interval corresponding to the overlapping portion (S430).
その次、本発明の一実施形態に係るコグニティブ無線通信方法は、重複部分に含まれた重複信号およびセンシング区間中に受信したセンシング信号を利用して第１信号の存在と関わる状態情報を生成する（Ｓ４４０）。
この時、状態情報を生成するステップ（Ｓ４４０）は、重複時間区間中に受信された信号の差およびセンシング信号に基づいて状態情報を生成するステップでありうる。
Subsequently, the cognitive radio communication method according to an embodiment of the present invention generates state information related to the presence of the first signal using the overlapping signal included in the overlapping portion and the sensing signal received during the sensing period. (S440).
At this time, the step of generating the state information (S440) may be a step of generating the state information based on the difference between the signals received during the overlapping time interval and the sensing signal.
その次、本発明の一実施形態に係るコグニティブ無線通信方法は、生成された状態情報が予め定められた閾値より大きいか否かを判断する（Ｓ４５０）。
この時、状態情報が閾値より大きい場合、本発明の一実施形態に係るコグニティブ無線通信方法は、第２ネットワークに属する通信装置が使用中の周波数リソースを変更する第１通信動作モードまたは前記通信装置が通信動作を停止する第２通信動作モードに通信動作モードを決定する（Ｓ４６０）。
Next, the cognitive radio communication method according to the embodiment of the present invention determines whether the generated state information is greater than a predetermined threshold (S450).
At this time, when the state information is larger than the threshold, the cognitive radio communication method according to an embodiment of the present invention is configured to change the frequency resource used by the communication apparatus belonging to the second network to the first communication operation mode or the communication apparatus. Determines the communication operation mode as the second communication operation mode in which the communication operation is stopped (S460).
その逆に、状態情報が閾値より小さいか等しい場合、本発明の一実施形態に係るコグニティブ無線通信方法は、前記通信装置が通信動作を行い続ける第３通信動作モードに通信動作モードを決定し、ステップＳ４１０が新たに開始される。
本発明に係るコグニティブ無線通信方法は図１〜図３に対する説明が同じく適用されるので以下詳細な説明は省略する。
Conversely, when the state information is less than or equal to the threshold value, the cognitive radio communication method according to an embodiment of the present invention determines the communication operation mode as the third communication operation mode in which the communication apparatus continues to perform the communication operation, Step S410 is newly started.
The cognitive radio communication method according to the present invention is similarly applied to the description with respect to FIGS.
本発明に係るコグニティブ無線通信方法は、様々なコンピュータ手段を介して行われ得るプログラム命令形態として実現され、コンピュータで読み取りできる媒体に記録され得る。前記コンピュータで読み取りできる媒体はプログラム命令、データファイル、データ構造などを単独でまたは組み合わせて含むことができる。前記媒体に記録されるプログラム命令は、特に本発明のために設計され構成されたものであるか、コンピュータソフトウェア当業者に公知の使用可能なものであってもよい。コンピュータで読み取りできる記録媒体の例にはハードディスク、フロッピーディスク、および磁気テープのような磁気媒体（ｍａｇｎｅｔｉｃ ｍｅｄｉａ）、ＣＤ−ＲＯＭ、ＤＶＤのような光記録媒体（ｏｐｔｉｃａｌ ｍｅｄｉａ）、フロプティカルディスク（ｆｌｏｐｔｉｃａｌ ｄｉｓｋ）のような磁気−光媒体（ｍａｇｎｅｔｏ−ｏｐｔｉｃａｌ ｍｅｄｉａ）、およびＲＯＭ、ＲＡＭ、フラッシュメモリなどのようなプログラム命令を格納して行うように特別に構成されたハードウェア装置が含まれる。プログラム命令の例にはコンパイラによって作られるもののような機械語コードだけでなく、インタープリタなどを使ってコンピュータによって実行できる高級言語コードが含まれる。上記のハードウェア装置は本発明の動作を行うために１つ以上のソフトウェアモジュールとして作動するように構成することができ、その逆も同様である。 The cognitive radio communication method according to the present invention is realized as a program command form that can be performed via various computer means, and can be recorded on a computer-readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specifically designed and configured for the present invention or usable by those skilled in the art of computer software. Examples of the computer-readable recording medium include a hard disk, a floppy disk, and a magnetic medium such as a magnetic tape, an optical recording medium such as a CD-ROM and a DVD, and a floppy disk (floppy disk). Included are hardware devices that are specially configured to store and execute program instructions such as ROM, RAM, flash memory, and the like, and magneto-optical media such as disk. Examples of program instructions include not only machine language code such as that produced by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above can be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.
以上のように、本発明について限定された実施形態と図面によって説明したが、本発明は前記実施形態に限定されるものではなく、本発明が属する分野で通常の知識を有する者であれば、本記載から様々に修正および変形することができる。
よって、本発明の範囲は説明した実施形態に限定されるものではなく、特許請求の範囲のみならず、該特許請求の範囲と均等なものなどによって定められなければならない。
As described above, the present invention has been described with reference to the embodiments and the drawings. However, the present invention is not limited to the above-described embodiments, and any person who has ordinary knowledge in the field to which the present invention belongs can be used. Various modifications and variations can be made from this description.
Therefore, the scope of the present invention is not limited to the described embodiments, but must be determined not only by the claims but also by the equivalents of the claims.
３１０：信号受信部
３２０：状態情報受信部
３３０：動作モード決定部
310: Signal receiving unit 320: State information receiving unit 330: Operation mode determining unit
Claims (17)
前記重複部分に含まれた信号の間の同一性を利用して前記第１信号の存在に関わる状態情報を生成する状態情報生成部と、
前記状態情報に基づいて前記第２ネットワークに属する通信装置の通信動作モードを決定する動作モード決定部とを備えるコグニティブ無線通信装置。 A signal receiving unit that receives a first signal of a first network and a second signal of a second network, and the second signal includes two or more overlapping portions in which the same signal is repeated;
A state information generating unit that generates state information related to the presence of the first signal using the identity between the signals included in the overlapping portion;
A cognitive radio communication apparatus comprising: an operation mode determination unit that determines a communication operation mode of a communication apparatus belonging to the second network based on the state information.
前記重複部分に相応する重複時間区間中に受信された信号の差に基づいて前記状態情報を生成する請求項１に記載のコグニティブ無線通信装置。 The state information generation unit
The cognitive radio communication apparatus according to claim 1, wherein the state information is generated based on a difference between signals received during an overlapping time interval corresponding to the overlapping portion.
前記通信装置が使用中の周波数リソースを変更する第１通信動作モード、前記通信装置が通信動作を停止する第２通信動作モード、または前記通信装置が遂行中である通信動作を維持する第３通信動作モードのうちのいずれか１つを前記通信動作モードに決定する請求項１に記載のコグニティブ無線通信装置。 The operation mode determination unit
A first communication operation mode for changing a frequency resource in use by the communication device; a second communication operation mode for the communication device to stop communication operation; or a third communication for maintaining a communication operation being performed by the communication device. The cognitive radio communication apparatus according to claim 1, wherein any one of operation modes is determined as the communication operation mode.
前記状態情報と予め定められた閾値とを比較し、比較結果を用いて前記通信動作モードを決定する請求項１に記載のコグニティブ無線通信装置。 The operation mode determination unit
The cognitive radio communication apparatus according to claim 1, wherein the state information is compared with a predetermined threshold, and the communication operation mode is determined using a comparison result.
前記重複部分に含まれた重複信号および前記第１信号を検出するためのセンシング区間中に受信したセンシング信号を利用して前記第１信号の存在に関わる状態情報を生成する状態情報生成部と、
前記状態情報に基づいて前記第２ネットワークに属する通信装置の通信動作モードを決定する動作モード決定部とを備えるコグニティブ無線通信装置。 A signal receiving unit that receives a first signal of a first network and a second signal of a second network, and the second signal includes two or more overlapping portions in which the same signal is repeated;
A state information generating unit that generates state information related to the presence of the first signal using a duplicated signal included in the overlapped part and a sensing signal received during a sensing period for detecting the first signal;
A cognitive radio communication apparatus comprising: an operation mode determination unit that determines a communication operation mode of a communication apparatus belonging to the second network based on the state information.
前記重複部分に相応する重複時間区間中に受信された信号の差および前記センシング信号に基づいて前記状態情報を生成する請求項７に記載のコグニティブ無線通信装置。 The state information generation unit
The cognitive radio communication apparatus according to claim 7, wherein the state information is generated based on a difference between signals received during an overlapping time interval corresponding to the overlapping portion and the sensing signal.
前記通信装置が使用中の周波数リソースを変更する第１通信動作モード、前記通信装置が通信動作を停止する第２通信動作モード、または前記通信装置が遂行中である通信動作を維持する第３通信動作モードのうちのいずれか１つを前記通信動作モードに決定する請求項７に記載のコグニティブ無線通信装置。 The operation mode determination unit
A first communication operation mode for changing a frequency resource in use by the communication device; a second communication operation mode for the communication device to stop communication operation; or a third communication for maintaining a communication operation being performed by the communication device. The cognitive radio communication apparatus according to claim 7, wherein any one of operation modes is determined as the communication operation mode.
前記状態情報と予め定められた閾値とを比較し、比較結果を用いて前記通信動作モードを決定する請求項７に記載のコグニティブ無線通信装置。 The operation mode determination unit
The cognitive radio communication apparatus according to claim 7, wherein the state information is compared with a predetermined threshold value, and the communication operation mode is determined using a comparison result.
前記重複部分に含まれた信号の間の同一性を利用して前記第１信号の存在に関わる状態情報を生成するステップと、
前記状態情報に基づいて前記第２ネットワークに属する通信装置の通信動作モードを決定するステップとを含むコグニティブ無線通信方法。 Receiving a first signal of a first network and a second signal of a second network, the second signal including two or more overlapping portions in which the same signal is repeated;
Generating state information relating to the presence of the first signal using the identity between the signals included in the overlapping portion;
Determining a communication operation mode of a communication device belonging to the second network based on the state information.
前記重複部分に相応する重複時間区間中に受信された信号の差に基づいて前記状態情報を生成するステップである請求項１１に記載のコグニティブ無線通信方法。 The step of generating the state information includes:
12. The cognitive radio communication method according to claim 11, wherein the state information is generated based on a difference between signals received during an overlap time interval corresponding to the overlap portion.
前記通信装置が使用中の周波数リソースを変更する第１通信動作モード、前記通信装置が通信動作を停止する第２通信動作モード、または前記通信装置が遂行中である通信動作を維持する第３通信動作モードのうちのいずれか１つを前記通信動作モードに決定する請求項１１に記載のコグニティブ無線通信方法。 In the step of determining the communication operation mode,
A first communication operation mode for changing a frequency resource in use by the communication device; a second communication operation mode for the communication device to stop communication operation; or a third communication for maintaining a communication operation being performed by the communication device. The cognitive radio communication method according to claim 11, wherein any one of operation modes is determined as the communication operation mode.
前記重複部分に含まれた重複信号および前記第１信号を検出するセンシング区間中に受信したセンシング信号を利用して前記第１信号の存在に関わる状態情報を生成するステップと、
前記状態情報に基づいて前記第２ネットワークに属する通信装置の通信動作モードを決定するステップとを含むコグニティブ無線通信方法。 Receiving a first signal of a first network and a second signal of a second network, the second signal including two or more overlapping portions in which the same signal is repeated;
Generating state information related to the presence of the first signal using a duplicated signal included in the duplicated part and a sensing signal received during a sensing interval for detecting the first signal;
Determining a communication operation mode of a communication device belonging to the second network based on the state information.
前記重複部分に相応する重複時間区間中に受信された信号の差および前記センシング信号に基づいて前記状態情報を生成する請求項１４に記載のコグニティブ無線通信方法。 The step of generating the state information includes:
The cognitive radio communication method according to claim 14, wherein the state information is generated based on a difference between signals received during an overlapping time interval corresponding to the overlapping portion and the sensing signal.
前記状態情報と予め定められた閾値とを比較し、比較結果を用いて前記通信動作モードを決定する請求項１４に記載のコグニティブ無線通信方法。 Determining the communication operation mode comprises:
The cognitive radio communication method according to claim 14, wherein the state information is compared with a predetermined threshold, and the communication operation mode is determined using a comparison result.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2007-0110405 | 2007-10-31 | ||
| KR20070110405A KR100934572B1 (en) | 2007-10-31 | 2007-10-31 | Cognitive wireless communication device using overlapping signals and method thereof |
Publications (2)
| Publication Number | Publication Date |
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| JP2009112006A true JP2009112006A (en) | 2009-05-21 |
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| KR101306470B1 (en) * | 2009-12-21 | 2013-09-09 | 한국전자통신연구원 | Network Device and data communication method for emergency traffic using cognitive pilot channel |
| CN115696371A (en) * | 2021-07-23 | 2023-02-03 | 维沃移动通信有限公司 | Sensing method and device and network equipment |
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| KR100785799B1 (en) * | 2005-10-14 | 2007-12-13 | 한국전자통신연구원 | Method of Frequency Channel Assignment using Effective Spectrum Sensing in multiple FA system |
| US7710919B2 (en) * | 2005-10-21 | 2010-05-04 | Samsung Electro-Mechanics | Systems, methods, and apparatuses for spectrum-sensing cognitive radios |
| KR101129795B1 (en) * | 2005-11-05 | 2012-03-27 | 인하대학교 산학협력단 | Efficient spectrum sensing method and procedure in cognitive radio environment |
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| CN1889752A (en) * | 2006-06-26 | 2007-01-03 | 西安交通大学 | Authorized user detection frequency distributing method in cognitive radio system |
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| KR100934572B1 (en) | 2009-12-30 |
| CN101426273A (en) | 2009-05-06 |
| WO2009057907A2 (en) | 2009-05-07 |
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