JP2008211599A - Transmission power control method and radio communication apparatus - Google Patents
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Abstract
【課題】下り（ダウンリンク）における信号品質および電界強度に基づいて、端末が自律的に送信電力を制御することができる送信電力制御方法および無線通信装置を提供する。
【解決手段】端末から基地局への送信電力を制御する本発明の送信電力制御方法では、前記端末が前記基地局から送信された信号を受信し、受信信号における現在の信号品質（ｓｉｎｒ）および過去の所定期間の平均信号品質を把握し、前記受信信号における、現在の希望波の受信電界強度（ｄｓｓｉ）および過去の所定期間の希望波の平均受信電界強度を把握し、前記把握した現在の信号品質が前記過去の所定期間の平均信号品質よりも劣化している場合で、かつ、前記現在の希望波の受信電界強度が前記過去の所定期間の希望波の平均受信電界強度よりも劣化している場合には、前記端末から前記基地局への送信電力を増加させるように制御する。
【選択図】図２Provided are a transmission power control method and a radio communication apparatus in which a terminal can autonomously control transmission power based on signal quality and electric field strength in downlink (downlink).
In a transmission power control method of the present invention for controlling transmission power from a terminal to a base station, the terminal receives a signal transmitted from the base station, and a current signal quality (sinr) in the received signal and The average signal quality of the past predetermined period is grasped, the received electric field intensity (dssi) of the current desired wave in the received signal and the average received electric field intensity of the desired wave of the past predetermined period in the received signal, and the grasped current The signal quality is deteriorated from the average signal quality of the past predetermined period, and the current received signal strength of the desired wave is deteriorated from the average received field intensity of the desired wave of the past predetermined period. If so, control is performed to increase transmission power from the terminal to the base station.
[Selection] Figure 2
Description
本発明は、ワイヤレス・ブロードバンド・システム等の無線通信システムに適用可能な送信電力制御方法および、該無線通信システムの構成要素である無線通信端末や基地局等の無線通信装置に関するものである。 The present invention relates to a transmission power control method applicable to a wireless communication system such as a wireless broadband system, and a wireless communication apparatus such as a wireless communication terminal or a base station that is a component of the wireless communication system.
ワイヤレス・ブロードバンド・システム等の無線通信システムにおいて、無線通信端末（以下、端末ともいう）における上り（アップリンク）の送信電力を制御する際には、端末における下り（ダウンリンク）の信号品質（ＳＩＮＲ）を基地局へ通知し、端末から通知された信号品質（ＳＩＮＲ）と所定の信号品質（目標ＳＩＮＲ）とを基地局が比較し、端末から通知された信号品質（ＳＩＮＲ）が所定の信号品質（目標ＳＩＮＲ）に満たない場合には、基地局から端末に対して「当該端末の送信電力を増加させる要求」を送出し、当該要求に基づいて、当該端末が送信電力を増加させる制御を行う。このような基地局主導の端末の送信電力制御の従来例としては、例えば特許文献１に記載のものがある。
When controlling uplink (uplink) transmission power in a radio communication terminal (hereinafter also referred to as a terminal) in a radio communication system such as a wireless broadband system, the downlink (downlink) signal quality (SINR) in the terminal ) To the base station, the base station compares the signal quality (SINR) notified from the terminal with a predetermined signal quality (target SINR), and the signal quality (SINR) notified from the terminal is the predetermined signal quality. If the target SINR is not satisfied, the base station sends a “request to increase the transmission power of the terminal” to the terminal, and performs control to increase the transmission power based on the request. . As a conventional example of transmission power control of such a terminal led by a base station, for example, there is one described in
上記従来例の送信電力制御においては、横軸が時間軸に対応している図４に示すように、上り（アップリンク）および下り（ダウンリンク）でタイム・スロット長が異なる非対称構成の各３タイム・スロット（ｔｓ０，ｔｓ１，ｔｓ２）を上り下り交互に送信する際に、上りのタイム・スロット（ｔｓ０）では「基地局指示による送信電力制御」を端末が行い、下りのタイム・スロット（ｔｓ０）では「基地局による送信電力制御」を行う。
すなわち、上記送信電力制御においては、図５のフローチャートに示すように、ステップＳ５１で、端末が基地局に、時刻（ｔ−１）における端末の受信信号の信号品質情報である「ｕｔ＿ｓｉｎｒ（ｔ−１）」を通知（送出）すると、ステップＳ５２では、この情報を受信した基地局が、時刻（ｔ−１）における端末の希望波の受信電界強度である「ｕｔ＿ｓｉｎｒ（ｔ−１）」と受信信号の信号品質ｓｉｎｒの所定の閾値である「ｓｉｎｒ＿ｔｈｒｅｓｈ」との大小比較を行い、当該大小比較結果に基づき、端末の希望波の受信電界強度が受信信号の信号品質ｓｉｎｒの所定の閾値よりも小さい場合には、ステップＳ５３のＹＥＳからステップＳ５４に進んで、送信電力を増加させるように端末に通知し、端末の希望波の受信電界強度が受信信号の信号品質ｓｉｎｒの所定の閾値を超える場合には、ステップＳ５３のＮＯからステップＳ５５に進んで、送信電力を減少させるように端末に通知する。これらの通知を受けた端末では、基地局の指示に従って自局の送信電力制御を行う。つまり、基地局側で端末の送信電力の一括管理を行っている。
In the transmission power control of the above conventional example, as shown in FIG. 4 in which the horizontal axis corresponds to the time axis, each of the three asymmetrical configurations with different time slot lengths in the uplink (uplink) and downlink (downlink) When the time slot (ts0, ts1, ts2) is transmitted alternately upstream and downstream, the terminal performs “transmission power control according to the base station instruction” in the upstream time slot (ts0), and the downstream time slot (ts0). ) “Transmission power control by base station” is performed.
That is, in the transmission power control, as shown in the flowchart of FIG. 5, in step S51, the terminal sends the signal quality information of the received signal of the terminal at time (t−1) to the base station “ut_sinr (t− 1) "is notified (transmitted), in step S52, the base station receiving this information receives" ut_sinr (t-1) ", which is the received field strength of the desired wave of the terminal at time (t-1). A magnitude comparison with “sinr_thresh” that is a predetermined threshold value of the signal quality sinr of the signal is performed, and based on the magnitude comparison result, the received electric field strength of the desired wave of the terminal is smaller than the predetermined threshold value of the signal quality sinr of the received signal In such a case, the process proceeds from YES in step S53 to step S54 to notify the terminal to increase the transmission power, and the received electric field strength of the desired wave of the terminal is If it exceeds a predetermined threshold of signal quality sinr Shin signal, it proceeds from NO in step S53 to step S55, and notifies the terminal to reduce the transmission power. Upon receiving these notifications, the terminal performs transmission power control of its own station according to instructions from the base station. That is, the base station side performs collective management of terminal transmission power.
上記従来例の端末における送信電力制御においては、端末が信号品質（ＳＩＮＲ）を基地局へ通知した後に高速移動した場合や、端末が移動しなくても端末と基地局との間を移動体（車両等）が高速で横切った場合には、基地局が送信した信号が端末に到達するまでの間に受けるフェージングの影響により、下り（ダウンリンク）の信号品質が大きく変動して受信信号レベルが最適とならないことがある。このような信号品質の大きな変動が生じる状況になった場合には、端末の送信電力を即座に増加させなければ基地局が端末からの信号を適切に受信することができないが、上記のような従来の送信電力制御を用いる場合には、端末の送信電力制御に所定の時間を要するため、高速移動時等の電波環境の変化に追随することが困難であり、適切な送信電力制御ができなくなってしまう。
なお、上り（アップリンク）においても、１フレーム前の自局の送信電力が最適だったかどうかを約０．５フレーム前に通知された基地局からの電力制御情報で端末が判断するのでは、高速移動時等の電波環境の変化に追随するが困難であり、この場合も適切な送信電力制御ができなくなってしまう。
In the transmission power control in the terminal of the conventional example, when the terminal moves at a high speed after notifying the base station of the signal quality (SINR), or even if the terminal does not move, the mobile unit ( When the vehicle crosses at a high speed, the signal quality of the downlink (downlink) greatly fluctuates due to the fading effect that the signal transmitted by the base station receives before reaching the terminal, and the received signal level May not be optimal. In such a situation where a large fluctuation in signal quality occurs, the base station cannot properly receive the signal from the terminal unless the transmission power of the terminal is increased immediately. When conventional transmission power control is used, it takes a certain amount of time to control the transmission power of the terminal, making it difficult to follow changes in the radio wave environment such as when moving at high speeds, making it impossible to perform appropriate transmission power control. End up.
Even in the uplink (uplink), the terminal determines whether or not the transmission power of the local station one frame before is optimal based on the power control information from the base station notified about 0.5 frames before, It is difficult to follow changes in the radio wave environment such as when moving at high speed, and in this case, appropriate transmission power control cannot be performed.
本発明は、下り（ダウンリンク）における信号品質および電界強度に基づいて、端末が自律的に送信電力を制御することができる送信電力制御方法を提供することを第１の目的とする。
本発明は、下り（ダウンリンク）における信号品質および電界強度に基づいて、端末が自律的に送信電力を制御することができる無線通信装置を提供することを第２の目的とする。
A first object of the present invention is to provide a transmission power control method in which a terminal can autonomously control transmission power based on signal quality and electric field strength in downlink (downlink).
A second object of the present invention is to provide a wireless communication apparatus in which a terminal can autonomously control transmission power based on downlink (downlink) signal quality and electric field strength.
上記第１の目的を達成するため、請求項１に係る送信電力御方法は、無線通信装置から他の無線通信装置への送信電力を制御する送信電力制御方法であって、前記無線通信装置が前記他の無線通信装置から送信された信号を受信する第１ステップと、受信信号における現在の信号品質および過去の所定期間の平均信号品質を把握する第２ステップと、前記受信信号における、現在の希望波の受信電界強度および過去の所定期間の希望波の平均受信電界強度を把握する第３ステップと、前記把握した現在の信号品質が前記過去の所定期間の平均信号品質よりも劣化している場合で、かつ、前記現在の希望波の受信電界強度が前記過去の所定期間の希望波の平均受信電界強度よりも劣化している場合には、前記他の無線通信装置への送信電力を増加させるように制御する第４ステップと、を含むことを特徴とする。
In order to achieve the first object, a transmission power control method according to
前記無線通信装置が、前記受信信号における現在の信号品質を前記他の無線通信装置へ通知する第５ステップと、前記通知に基づいて前記他の無線通信装置から通知された送信電力の増加要求に関する情報を取得する第６ステップと、をさらに含み、前記第４ステップでは、前記把握した現在の信号品質が前記過去の所定期間の平均信号品質よりも劣化している場合で、かつ、前記現在の希望波の受信電界強度が前記過去の所定期間の希望波の平均受信電界強度よりも劣化していない場合には、前記他の無線通信装置からの送信電力の増加要求に基づいて前記他の無線通信装置への送信電力を増加させるように制御することが、下り（ダウンリンク）における信号品質および電界強度に基づいて、端末が自律的に送信電力を制御することができる送信電力制御方法を提供する上で好ましい。 The wireless communication apparatus relates to a fifth step of notifying the other wireless communication apparatus of the current signal quality in the received signal, and a transmission power increase request notified from the other wireless communication apparatus based on the notification. A sixth step of acquiring information, wherein in the fourth step, the grasped current signal quality is deteriorated from an average signal quality of the past predetermined period, and the current If the received electric field strength of the desired wave is not degraded from the average received electric field strength of the desired wave in the past predetermined period, the other radio is transmitted based on a request to increase the transmission power from the other radio communication device. Control to increase the transmission power to the communication device allows the terminal to control the transmission power autonomously based on downlink signal quality and electric field strength. Preferred in providing that transmission power control method.
前記無線通信装置が、前記受信信号における現在の信号品質を前記他の無線通信装置へ通知する第５ステップと、前記通知に基づいて前記他の無線通信装置から通知された送信電力の増加要求に関する情報を取得する第６ステップと、前記受信信号における妨害波の受信電界強度を把握する第７ステップと、前記他の無線通信装置の負荷状態を把握する第８ステップと、をさらに含み、前記第４ステップでは、前記把握した現在の信号品質が前記過去の所定期間の平均信号品質よりも劣化していない場合で、かつ、前記現在の希望波の受信電界強度が前記過去の所定期間の希望波の平均受信電界強度よりも劣化している場合には、前記他の無線通信装置の負荷状態および前記受信信号における妨害波の受信電界強度に基づいて、前記他の無線通信装置からの送信電力の増加要求に従って前記他の無線通信装置への送信電力を増加させるように制御するか、あるいは、前記他の無線通信装置からの送信電力の増加要求の有無に拘わらず前記他の無線通信装置への送信電力を増加させるように制御することが、下り（ダウンリンク）における信号品質および電界強度に基づいて、端末が自律的に送信電力を制御することができる送信電力制御方法を提供する上で好ましい。 The wireless communication apparatus relates to a fifth step of notifying the other wireless communication apparatus of the current signal quality in the received signal, and a transmission power increase request notified from the other wireless communication apparatus based on the notification. A sixth step of obtaining information; a seventh step of grasping a received electric field strength of an interference wave in the received signal; and an eighth step of grasping a load state of the other radio communication device, In step 4, the grasped current signal quality is not deteriorated from the average signal quality of the past predetermined period, and the received electric field strength of the current desired wave is the desired wave of the past predetermined period. In the case of deterioration of the average received electric field strength of the other radio communication device based on the load state of the other radio communication device and the received electric field strength of the interference wave in the received signal. Control to increase the transmission power to the other wireless communication device according to the transmission power increase request from the communication device, or the presence or absence of a request to increase the transmission power from the other wireless communication device Control to increase the transmission power to other wireless communication devices allows the terminal to autonomously control the transmission power based on the signal quality and electric field strength in the downlink (downlink) Preferred for providing a method.
前記把握した妨害波の受信電界強度が所定の閾値を超え、かつ、前記把握した他の無線通信装置の負荷状態が所定の負荷状態を超えている場合には、前記他の無線通信装置への送信電力を維持、あるいは、前記他の無線通信装置からの送信電力の増加要求に従って前記他の無線通信装置への送信電力を増加させ、前記把握した妨害波の受信電界強度が所定の閾値を超え、かつ、前記把握した他の無線通信装置の負荷状態が所定の負荷状態を超えていない場合には、前記他の無線通信装置への送信電力を増加させるように制御することが、下り（ダウンリンク）における信号品質および電界強度に基づいて、端末が自律的に送信電力を制御することができる送信電力制御方法を提供する上で好ましい。 When the received electric field strength of the grasped interference wave exceeds a predetermined threshold value and the load state of the grasped other wireless communication device exceeds a predetermined load state, to the other wireless communication device Maintain transmission power or increase transmission power to the other radio communication device in accordance with a request to increase transmission power from the other radio communication device, and the received electric field strength of the grasped interference wave exceeds a predetermined threshold And when the grasped load state of the other wireless communication device does not exceed a predetermined load state, control to increase the transmission power to the other wireless communication device It is preferable to provide a transmission power control method in which a terminal can autonomously control transmission power based on signal quality and electric field strength in a link.
上記第２の目的を達成するため、請求項５に係る無線通信装置は、他の無線通信装置からの受信信号における現在の信号品質および過去の所定期間の平均信号品質を把握する信号品質把握手段と、前記受信信号における、現在の希望波の受信電界強度および過去の所定期間の希望波の平均受信電界強度を把握する受信電界強度把握手段と、前記把握した現在の信号品質が前記過去の所定期間の平均信号品質よりも劣化している場合で、かつ、前記現在の希望波の受信電界強度が前記過去の所定期間の希望波の平均受信電界強度よりも劣化している場合には、前記他の無線通信装置への送信電力を増加させるように制御する送信電力制御手段と、を備えることを特徴とする。 In order to achieve the second object, the wireless communication apparatus according to claim 5 is a signal quality grasping means for grasping a current signal quality and an average signal quality in a past predetermined period in a received signal from another wireless communication apparatus. A received electric field strength grasping means for grasping a received electric field strength of a desired wave in the received signal and an average received electric field strength of a desired wave in a past predetermined period, and the grasped current signal quality is a predetermined value in the past. If the current signal strength of the current desired wave is deteriorated from the average signal quality of the period and the current signal strength of the desired wave is deteriorated from the average signal strength of the desired wave of the past predetermined period, Transmission power control means for controlling to increase transmission power to another wireless communication device.
本発明によれば、下り（ダウンリンク）における信号品質および電界強度に基づいて、端末が自律的に送信電力を制御することができる送信電力制御方法および無線通信装置を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the transmission power control method and radio | wireless communication apparatus with which a terminal can control transmission power autonomously based on the signal quality and electric field strength in a downlink (downlink) can be provided.
以下、本発明を実施するための最良の形態を図面に基づき詳細に説明する。
図１は本発明の第１実施形態の送信電力制御方法を適用する無線通信システムにおいて無線通信装置である無線通信端末が他の無線通信装置である基地局との間で信号を送受信する際の送信電力制御の概要を示す図である。図１において、横軸は時間軸に対応しており、上り（アップリンク）および下り（ダウンリンク）でタイム・スロット長が異なる非対称構成の各３タイム・スロット（ｔｓ０，ｔｓ１，ｔｓ２）を上り下り交互に送信する際に、上りのタイム・スロット（ｔｓ０）では「受信信号の信号品質と電界強度とによる送信電力制御」を端末が行い、下りのタイム・スロット（ｔｓ０）では「端末情報を加味した基地局による送信電力制御」を行う。これにより、端末は受信信号の信号品質と電界強度とにより自己の送信電力を制御し、基地局は端末から通知されした端末情報に基づいて自局の送信電力を制御するので、下り（ダウンリンク）信号の送信で発生したフェージングの情報を、直後の上り（アップリンク）信号の送信に反映させることができる。
Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 illustrates a case where a radio communication terminal that is a radio communication apparatus transmits and receives signals to and from a base station that is another radio communication apparatus in a radio communication system to which the transmission power control method according to the first embodiment of the present invention is applied. It is a figure which shows the outline | summary of transmission power control. In FIG. 1, the horizontal axis corresponds to the time axis, and each time slot (ts0, ts1, ts2) of an asymmetrical configuration with different time slot lengths in uplink (uplink) and downlink (downlink) is uplinked. When transmitting alternately downstream, the terminal performs “transmission power control based on the signal quality and field strength of the received signal” in the upstream time slot (ts0), and “terminal information is transmitted in the downstream time slot (ts0)”. “Transmission power control by base station in consideration”. Accordingly, the terminal controls its own transmission power based on the signal quality and electric field strength of the received signal, and the base station controls its own transmission power based on the terminal information notified from the terminal. ) Fading information generated by signal transmission can be reflected in the transmission of the immediately upstream (uplink) signal.
上記本実施形態の送信電力制御方法を適用する無線通信システムとしては、ワイヤレス・ブロードバンド・システムが好ましいが、特に、本願出願人らが提唱している「アイ・バースト（ｉＢｕｒｓｔ（登録商標））システム」と称せられるワイヤレス・ブロードバンド・システムに適用することが好ましい。「アイ・バースト（ｉＢｕｒｓｔ（登録商標））システム」は、マルチキャリアを採用したＴＤＭＡ／ＴＤＤのシステムであり、上り（アップリンク）および下り（ダウンリンク）のタイム・スロット数は、各３タイム・スロットの合計６タイム・スロットで構成されており、上りおよび下りのタイム・スロット長が異なる非対称構成となっており、下りのデータ転送レートに重きをおいた構成である。ｉＢｕｒｓｔ（登録商標）システムのシンボル・レートは５００ｋシンボル／ｓｅｃであり、３タイム・スロットの全てを１ユーザが使用した場合の最大データ転送レートは、下りは１０６１ｋｂｐｓになり、上りは３４６ｋｂｐｓになる。また、ｉＢｕｒｓｔ（登録商標）システムで使用する周波数帯域は５ＭＨｚであり、１キャリア当たりの帯域は６２５ｋＨｚであり、ｉＢｕｒｓｔ（登録商標）システムの１フレームは５ｍｓｅｃである。 As a wireless communication system to which the transmission power control method of the present embodiment is applied, a wireless broadband system is preferable. In particular, the “iBurst (registered trademark)” system proposed by the applicants of the present application is proposed. It is preferably applied to a wireless broadband system referred to as The “iBurst (registered trademark) system” is a TDMA / TDD system employing multi-carrier, and the number of uplink (uplink) and downlink (downlink) time slots is 3 times each. The slot is composed of a total of 6 time slots, has an asymmetrical configuration with different upstream and downstream time slot lengths, and places importance on the downstream data transfer rate. The symbol rate of the iBurst (registered trademark) system is 500 ksymbols / sec, and the maximum data transfer rate when one user uses all three time slots is 1061 kbps for downlink and 346 kbps for uplink. The frequency band used in the iBurst (registered trademark) system is 5 MHz, the band per carrier is 625 kHz, and one frame of the iBurst (registered trademark) system is 5 msec.
図２は第１実施形態の無線通信システムにおいて無線通信端末が実施する送信電力制御を示すフローチャートである。まず、図２のフローチャートのステップ１１では、端末において現在の受信信号（タイム・スロット）の監視を行う。この受信信号の監視では、受信信号の信号品質（ｓｉｎｒ）と、希望波の受信電界強度（ｄｓｓｉ）と、妨害波も含む受信電界強度（ｕｒｓｓｉ）とを監視対象としている。次のステップＳ１２では、時刻（ｔ−ｎ）のタイム・スロット（ｎ＝１，２，・・・，Ｎ）の信号品質（ｓｉｎｒ）の平均値（すなわち、過去の所定期間の平均信号品質）と、上記ステップＳ１１で求めた現在時刻（ｔ）の信号品質（ｓｉｎｒ）とを比較し、所定期間の平均信号品質に対し現在時刻の信号品質が劣化した場合にはステップＳ１３に進み、所定期間の平均信号品質に対し現在時刻の信号品質が劣化していない場合にはステップＳ１６に進む。ステップＳ１３では、時刻（ｔ−ｎ）のタイム・スロット（ｎ＝１，２，・・・，Ｎ）の希望波の受信電界強度（ｄｓｓｉ）の平均値（すなわち、過去の所定期間の希望波の平均受信電界強度）と、上記ステップＳ１１で求めた現在時刻（ｔ）の希望波の平均受信電界強度とを比較し、所定期間の希望波の平均受信電界強度に対し現在時刻（ｔ）の希望波の受信電界強度が劣化した場合にはステップＳ１４に進み、所定期間の希望波の平均受信電界強度に対し現在時刻（ｔ）の希望波の受信電界強度が劣化していない場合にはステップＳ１５に進む。ステップＳ１４では、当該端末の電波環境が劣化したと判断して、当該端末の送信電力を増加させる。ステップＳ１５では、当該端末における妨害波が増加したと判断して、当該無線通信システムの均衡を保つために、基地局情報（基地局から通知された送信電力情報）に従い、当該送信電力情報が送信電力増加要求であれば送信電力を増加させ、当該送信電力情報が送信電力減少要求であれば送信電力を減少させる。 FIG. 2 is a flowchart showing transmission power control performed by the wireless communication terminal in the wireless communication system of the first embodiment. First, in step 11 of the flowchart of FIG. 2, the terminal monitors the current received signal (time slot). In the monitoring of the received signal, the signal quality (sinr) of the received signal, the received electric field intensity (dssi) of the desired wave, and the received electric field intensity (urssi) including the interference wave are monitored. In the next step S12, the average value of the signal quality (sinr) of the time slot (n = 1, 2,..., N) at time (t−n) (that is, the average signal quality in the past predetermined period). Is compared with the signal quality (sinr) at the current time (t) obtained at step S11, and if the signal quality at the current time is deteriorated with respect to the average signal quality during the predetermined period, the process proceeds to step S13, and the predetermined period If the signal quality at the current time is not deteriorated with respect to the average signal quality, the process proceeds to step S16. In step S13, the average value of the received electric field strength (dssi) of the desired wave in the time slot (n = 1, 2,..., N) at time (t−n) (that is, the desired wave in the past predetermined period). ) And the average received electric field strength of the desired wave at the current time (t) obtained in step S11 above, and the average received electric field strength of the desired wave during the predetermined period is compared with the average received electric field strength at the current time (t). If the received electric field strength of the desired wave has deteriorated, the process proceeds to step S14. If the received electric field strength of the desired wave at the current time (t) has not deteriorated with respect to the average received electric field strength of the desired wave for a predetermined period, step S14 is performed. Proceed to S15. In step S14, it is determined that the radio wave environment of the terminal has deteriorated, and the transmission power of the terminal is increased. In step S15, it is determined that the interference wave in the terminal has increased, and the transmission power information is transmitted according to base station information (transmission power information notified from the base station) in order to maintain the balance of the radio communication system. If it is a power increase request, the transmission power is increased. If the transmission power information is a transmission power decrease request, the transmission power is decreased.
所定期間の平均信号品質から現在時刻の信号品質が劣化していない場合に進むステップＳ１６では、基地局の電波状況の混み具合を判定する。この電波状況の混み具合の判定は、基地局からの報知情報に含まれる、ｂチャネル（ｂ ｃｈａｎｎｅｌ）内の基地局負荷状態を示す情報（基地局負荷情報）と、基地局の妨害波も含む受信電界強度（受信信号に帯域フィルタをかける前の受信電界強度；ｕｒｓｓｉ）と、希望波の受信電界強度（ｄｓｓｉ）とに基づき、基地局の負荷状態が所定の負荷状態を超えた場合には当該基地局が混んでいると判定し、基地局の負荷状態が所定の負荷状態未満の場合には当該基地局が混んでいないと判定し、基地局の妨害波の受信電界強度が所定の閾値を超えた場合には当該基地局が混んでいると判定し、基地局の妨害波の受信電界強度が所定の閾値未満の場合には当該基地局が混んでいないと判定するとともに、基地局の希望波の受信電界強度が所定の閾値を超えた場合には当該基地局が混んでいると判定し、基地局の希望波の受信電界強度が所定の閾値未満の場合には当該基地局が混んでいないと判定するものとする。ステップＳ１６において基地局の電波状況が混んでいると判定した場合にはステップＳ１７に進み、基地局の電波状況が混んでいないと判定した場合にはステップＳ１８に進んで送信電力を増加させる。ステップＳ１７では基地局情報（基地局から通知された送信電力情報）に従い、当該送信電力情報が送信電力増加要求であれば送信電力を増加させ、当該送信電力情報が送信電力減少要求であれば送信電力を減少させる。 In step S16, which proceeds when the signal quality at the current time has not deteriorated from the average signal quality over a predetermined period, the degree of congestion of the radio conditions of the base station is determined. The determination of the radio wave condition congestion includes information (base station load information) indicating the base station load state in the b channel (b channel) included in the broadcast information from the base station, and the interference wave of the base station. When the load state of the base station exceeds a predetermined load state based on the received electric field strength (the received electric field strength before applying a bandpass filter to the received signal; urssi) and the received electric field strength (dssi) of the desired wave It is determined that the base station is crowded. If the load state of the base station is less than a predetermined load state, it is determined that the base station is not crowded, and the received electric field strength of the interference wave of the base station is a predetermined threshold value. If the base station is exceeded, it is determined that the base station is crowded. If the received electric field strength of the interference wave of the base station is less than a predetermined threshold, it is determined that the base station is not crowded. The received signal strength of the desired wave is When the threshold value of the base station is exceeded, it is determined that the base station is crowded. When the received field strength of the desired wave of the base station is less than the predetermined threshold value, it is determined that the base station is not crowded. . If it is determined in step S16 that the radio wave condition of the base station is crowded, the process proceeds to step S17. If it is determined that the radio wave condition of the base station is not crowded, the process proceeds to step S18 and the transmission power is increased. In step S17, according to the base station information (transmission power information notified from the base station), if the transmission power information is a transmission power increase request, the transmission power is increased. If the transmission power information is a transmission power decrease request, transmission is performed. Reduce power.
上記端末が実施する送信電力制御をまとめると、以下のようになる。
（１）現在の信号品質（ｓｉｎｒ）が過去の所定期間の平均信号品質よりも劣化している場合で、かつ、現在の希望波の受信電界強度（ｄｓｓｉ）が過去の所定期間の希望波の平均受信電界強度よりも劣化している場合には、ステップＳ１４で、端末から基地局への送信電力を増加させるように制御する。
（２）現在の信号品質（ｓｉｎｒ）が過去の所定期間の平均信号品質よりも劣化している場合で、かつ、現在の希望波の受信電界強度（ｄｓｓｉ）が過去の所定期間の希望波の平均受信電界強度よりも劣化していない場合には、ステップＳ１５で、基地局からの送信電力の増加要求に基づいて端末から基地局への送信電力を増加させるように制御する。
（３）現在の信号品質（ｓｉｎｒ）が過去の所定期間の平均信号品質よりも劣化していない場合で、かつ、現在の希望波の受信電界強度（ｄｓｓｉ）が過去の所定期間の希望波の平均受信電界強度よりも劣化している場合には、ステップＳ１７，ステップＳ１８で、基地局の負荷状態および受信信号における妨害波の受信電界強度（ｕｒｓｓｉ）に基づいて、基地局からの送信電力の増加要求に従って端末から基地局への送信電力を増加させるように制御するか、あるいは、基地局からの送信電力の増加要求の有無に拘わらず端末から基地局への送信電力を増加させるように制御する。
（４）妨害波の受信電界強度（ｕｒｓｓｉ）が所定の閾値を超え、かつ、基地局の負荷状態が所定の負荷状態を超えている場合には、ステップＳ１８で、端末から基地局への送信電力を増加させるように制御する。
なお、図２のステップＳ１２のＮＯからステップＳ１６以降に進む状況としては、以下の「変調方式（変調クラス）を上昇させたい状況」を挙げることができる。
（ａ）信号品質（ｓｉｎｒ）に変化が無く、基地局の電波状況が混んでいないときに、例えば上から３番目の変調方式で通信を行っていたが、周りに妨害波を与える可能性が少ないことが分かった場合、ステップＳ１８で、より高い変調方式（より高いＳＮ比を必要とする変調方式）を選択するために送信電力を増加させる。
（ｂ）信号品質（ｓｉｎｒ）に変化は無いが、基地局の電波状況が混んでいるときに、ステップＳ１７で、端末側では現状を維持し、基地局情報に従う（当該基地局情報が送信電力増加要求であれば送信電力を増加させ、当該基地局情報が送信電力減少要求であれば送信電力を減少させる）。
The transmission power control performed by the terminal is summarized as follows.
(1) In the case where the current signal quality (sinr) is degraded from the average signal quality in the past predetermined period, and the received electric field strength (dssi) of the current desired wave in the past predetermined period If the received electric field strength is lower than the average received electric field strength, control is performed to increase the transmission power from the terminal to the base station in step S14.
(2) When the current signal quality (sinr) is deteriorated from the average signal quality of a predetermined period in the past, and the received electric field strength (dssi) of the current desired wave is If the received electric field strength is not lower than the average received electric field strength, in step S15, control is performed to increase the transmission power from the terminal to the base station based on a request to increase the transmission power from the base station.
(3) When the current signal quality (sinr) has not deteriorated from the average signal quality in the past predetermined period, and the received electric field strength (dssi) of the current desired wave is that of the desired wave in the past predetermined period If the received electric field strength is lower than the average received electric field strength, in step S17 and step S18, the transmission power from the base station is determined based on the load state of the base station and the received electric field strength (urssi) of the interference wave in the received signal. Control to increase the transmission power from the terminal to the base station according to the increase request, or control to increase the transmission power from the terminal to the base station regardless of whether there is a request to increase the transmission power from the base station To do.
(4) If the received electric field strength (urssi) of the disturbing wave exceeds a predetermined threshold and the load state of the base station exceeds a predetermined load state, transmission from the terminal to the base station in step S18 Control to increase power.
Note that the following “situation in which the modulation scheme (modulation class) is desired to be raised” can be cited as a situation in which the process proceeds from step S12 in FIG.
(A) When there is no change in the signal quality (sinr) and the radio wave conditions of the base station are not crowded, for example, communication is performed with the third modulation method from the top, but there is a possibility of giving disturbing waves to the surroundings. If it is found that the number is small, in step S18, the transmission power is increased to select a higher modulation scheme (a modulation scheme that requires a higher S / N ratio).
(B) Although there is no change in signal quality (sinr), when the radio wave condition of the base station is crowded, in step S17, the current state is maintained on the terminal side and the base station information is followed (the base station information is transmitted power). If it is an increase request, the transmission power is increased, and if the base station information is a transmission power decrease request, the transmission power is decreased).
図３は第１実施形態の無線通信システムにおいて基地局が実施する送信電力制御を示すフローチャートである。まず、図３のフローチャートのステップ２１では、端末が基地局に、時刻（ｔ−１）における端末の希望波の受信電界強度情報である「ｕｔ＿ｄｓｓｉ＿ｉｎｆｏ（ｔ−１）」と、時刻（ｔ）における端末の送信電力情報である「ｕｔ＿ｔｘＰｗｒ＿ｉｎｆｏ（ｔ）」と、時刻（ｔ−１）における端末の受信信号の信号品質情報である「ｕｔ＿ｓｉｎｒ（ｔ−１）」を通知（送出）する。次のステップＳ２２では、前記各情報を受信した基地局が、パスロス（伝搬損失）の計算およびｓｉｎｒの比較を行う。すなわち、時刻（ｔ−ｎ）におけるパスロスである「ｐａｔｈｌｏｓｓ（ｔ−ｎ）」を求める計算と、時刻（ｔ−１）における基地局の送信電力である「ｂｓ＿ｔｘＰｗｒ（ｔ−１）」から時刻（ｔ−１）における端末の希望波の受信電界強度である「ｕｔ＿ｄｓｓｉ＿ｉｎｆｏ（ｔ−１）」を減算する計算と、時刻ｔにおける端末の送信電力である「ｕｔ＿ｐｗｒ＿ｉｎｆｏ（ｔ）」から時刻ｔにおける基地局の希望波の受信電界強度である「ｂｓ＿ｄｓｓｉ（ｔ）」を減算する計算とを行い、さらに、時刻（ｔ−１）における端末の受信信号の信号品質である「ｕｔ＿ｓｉｎｒ（ｔ−１）」と受信信号の信号品質の所定の閾値である「ｓｉｎｒ＿ｔｈｒｅｓｈ」との大小比較を行う。
FIG. 3 is a flowchart showing transmission power control performed by the base station in the wireless communication system of the first embodiment. First, in
次のステップＳ２３では、上記計算結果および上記大小比較結果に基づき、使用キャリアのｌｅｖｅｌが１に満たないか否かを判定し、使用キャリアのｌｅｖｅｌが１に満たない場合にはステップＳ２４に進んで送信電力を増加させ、使用キャリアのｌｅｖｅｌが１以上の場合にはステップＳ２５に進む。ステップＳ２５では、使用キャリアのｌｅｖｅｌが２に満たないか否かを判定し、使用キャリアのｌｅｖｅｌが１以上２未満の場合には、ステップＳ２６に進んで、端末へ送信電力を減少させるよう通知を行い、使用キャリアのｌｅｖｅｌが２以上の場合には、ステップＳ２７に進んで、端末主体の送信電力制御を許可しない旨を通知する。
なお、本実施形態では、使用キャリアに基づく送信電力制御の判断基準を２段階に設定したが、これに限定されるものではなく、１段階にしたり、３段階以上にしてもよい。
In the next step S23, it is determined whether or not the level of the used carrier is less than 1 based on the calculation result and the magnitude comparison result. If the level of the used carrier is less than 1, the process proceeds to step S24. When the transmission power is increased and the level of the used carrier is 1 or more, the process proceeds to step S25. In step S25, it is determined whether or not the level of the used carrier is less than 2. If the level of the used carrier is 1 or more and less than 2, the process proceeds to step S26 to notify the terminal to reduce the transmission power. If the level of the used carrier is 2 or more, the process proceeds to step S27 to notify that the transmission power control of the terminal entity is not permitted.
In the present embodiment, the criterion for determining the transmission power control based on the used carrier is set to two stages. However, the present invention is not limited to this, and may be one stage or three or more stages.
本実施形態の送信電力制御方法、ならびに、該送信電力制御方法を実施するための無線通信端末および基地局を含む無線通信システムによれば、端末側においては、受信信号の信号品質（ｓｉｎｒ）、希望波の受信電界強度（ｄｓｓｉ）および妨害波も含む受信電界強度（ｕｒｓｓｉ）を求めて、周囲の電波状況に応じた送信電力制御を行うことにより、フェージングの影響を軽減することができ、基地局においては、端末から通知された、時刻（ｔ−１）における端末の希望波の受信電界強度情報「ｕｔ＿ｄｓｓｉ＿ｉｎｆｏ（ｔ−１）」と、時刻（ｔ）における端末の送信電力情報「ｕｔ＿ｔｘＰｗｒ＿ｉｎｆｏ（ｔ）」と、時刻（ｔ−１）における端末の受信信号の信号品質情報「ｕｔ＿ｓｉｎｒ（ｔ−１）」とに基づき、周囲の電波状況に適した送信電力制御を行うように端末に通知するので、下り（ダウンリンク）における信号品質および電界強度に基づいて、端末が自律的に送信電力を制御することができる送信電力制御方法および無線通信装置を提供することができる。
また、本実施形態の送信電力制御方法、ならびに、該送信電力制御方法を実施するための無線通信端末および基地局を含む無線通信システムによれば、端末側での判断も取り入れることにより、高速移動性にも順応できる送信電力制御を行うことができ、基地局側においても全体的な電波の使用状況から判断して、即答性のある送信電力制御を行うことができるとともに、端末のみの判断ではなく基地局による判断も併用することにより、無線通信システムの均衡を保つことができる。
According to the transmission power control method of the present embodiment and the radio communication system including the radio communication terminal and the base station for implementing the transmission power control method, on the terminal side, the signal quality (sinr) of the received signal, The reception electric field strength (dssi) of the desired wave and the reception electric field strength (urssi) including the interference wave are obtained, and the influence of fading can be reduced by performing transmission power control according to the surrounding radio wave conditions. In the station, the received field strength information “ut_dssi_info (t−1)” of the desired wave at the time (t−1) notified from the terminal and the transmission power information “ut_txPwr_info (t) of the terminal at the time (t) ) ”And signal quality information“ ut_sinr (t−1) ”of the received signal of the terminal at time (t−1) Since the terminal is notified to perform transmission power control suitable for the situation, a transmission power control method in which the terminal can autonomously control transmission power based on signal quality and electric field strength in the downlink (downlink), and A wireless communication device can be provided.
In addition, according to the transmission power control method of the present embodiment, and the wireless communication system including the wireless communication terminal and the base station for implementing the transmission power control method, high-speed movement can be achieved by incorporating the determination on the terminal side. Transmission power control that can adapt to the characteristics of the mobile station, and the base station side can also determine the transmission power control with immediate response, judging from the overall radio wave usage status. In addition, it is possible to maintain the balance of the wireless communication system by using the determination by the base station together.
ｔｓ０，ｔｓ１，ｔｓ２ 上り／下りのタイム・スロット
ｓｉｎｒ 受信信号の信号品質
ｄｓｓｉ 希望波の受信電界強度
ｕｒｓｓｉ 妨害波も含む受信電界強度
ｕｔ＿ｔｘＰｗｒ＿ｉｎｆｏ（ｔ） 時刻（ｔ）における端末の送信電力情報
ｂｓ＿ｔｘＰｗｒ（ｔ−１）ｔｘＰｗｒ＿ｉｎｆｏ（ｔ）」 基地局の送信電力
ｓｉｎｒ＿ｔｈｒｅｓｈ 受信信号の信号品質の所定の閾値
ts0, ts1, ts2 Up / down time slot sinr Signal quality of received signal dssi Received signal strength of desired wave urssi Received field strength including interference wave ut_txPwr_info (t) Transmit power information of terminal at time (t) bs_txPwr (t -1) txPwr_info (t) "Transmission power of base station sinr_thresh Predetermined threshold of signal quality of received signal
Claims (5)
前記無線通信装置が前記他の無線通信装置から送信された信号を受信する第１ステップと、
受信信号における現在の信号品質および過去の所定期間の平均信号品質を把握する第２ステップと、
前記受信信号における、現在の希望波の受信電界強度および過去の所定期間の希望波の平均受信電界強度を把握する第３ステップと、
前記把握した現在の信号品質が前記過去の所定期間の平均信号品質よりも劣化している場合で、かつ、前記現在の希望波の受信電界強度が前記過去の所定期間の希望波の平均受信電界強度よりも劣化している場合には、前記他の無線通信装置への送信電力を増加させるように制御する第４ステップと、を含むことを特徴とする送信電力制御方法。 A transmission power control method for controlling transmission power from a wireless communication device to another wireless communication device,
A first step in which the wireless communication device receives a signal transmitted from the other wireless communication device;
A second step of grasping a current signal quality in a received signal and an average signal quality in a past predetermined period;
A third step of grasping the received electric field strength of the current desired wave and the average received electric field strength of the desired wave in the past predetermined period in the received signal;
When the grasped current signal quality is degraded from the average signal quality of the past predetermined period, and the received electric field strength of the current desired wave is the average received electric field of the desired wave of the past predetermined period And a fourth step of controlling so as to increase transmission power to the other wireless communication device when the strength is deteriorated than the strength.
前記通知に基づいて前記他の無線通信装置から通知された送信電力の増加要求に関する情報を取得する第６ステップと、をさらに含み、
前記第４ステップでは、前記把握した現在の信号品質が前記過去の所定期間の平均信号品質よりも劣化している場合で、かつ、前記現在の希望波の受信電界強度が前記過去の所定期間の希望波の平均受信電界強度よりも劣化していない場合には、前記他の無線通信装置からの送信電力の増加要求に基づいて前記他の無線通信装置への送信電力を増加させるように制御することを特徴とする請求項１記載の送信電力制御方法。 A fifth step in which the wireless communication device notifies the other wireless communication device of the current signal quality in the received signal;
A sixth step of acquiring information related to a request to increase transmission power notified from the other wireless communication device based on the notification; and
In the fourth step, the grasped current signal quality is degraded from the average signal quality of the past predetermined period, and the received electric field strength of the current desired wave is the past predetermined period. If the average received electric field strength of the desired wave is not deteriorated, control is performed to increase the transmission power to the other radio communication device based on a request to increase the transmission power from the other radio communication device. The transmission power control method according to claim 1.
前記通知に基づいて前記他の無線通信装置から通知された送信電力の増加要求に関する情報を取得する第６ステップと、
前記受信信号における妨害波の受信電界強度を把握する第７ステップと、
前記他の無線通信装置の負荷状態を把握する第８ステップと、をさらに含み、
前記第４ステップでは、前記把握した現在の信号品質が前記過去の所定期間の平均信号品質よりも劣化していない場合で、かつ、前記現在の希望波の受信電界強度が前記過去の所定期間の希望波の平均受信電界強度よりも劣化している場合には、前記他の無線通信装置の負荷状態および前記受信信号における妨害波の受信電界強度に基づいて、前記他の無線通信装置からの送信電力の増加要求に従って前記他の無線通信装置への送信電力を増加させるように制御するか、あるいは、前記他の無線通信装置からの送信電力の増加要求の有無に拘わらず前記他の無線通信装置への送信電力を増加させるように制御することを特徴とする請求項１記載の送信電力制御方法。 A fifth step in which the wireless communication device notifies the other wireless communication device of the current signal quality in the received signal;
A sixth step of acquiring information related to an increase request for transmission power notified from the other wireless communication device based on the notification;
A seventh step of grasping the received electric field strength of the interference wave in the received signal;
An eighth step of grasping a load state of the other wireless communication device; and
In the fourth step, when the grasped current signal quality is not degraded from the average signal quality of the past predetermined period, and the received electric field strength of the current desired wave is the past predetermined period If the average received electric field strength of the desired wave is deteriorated, transmission from the other wireless communication device based on the load state of the other wireless communication device and the received electric field strength of the interference wave in the received signal Control to increase the transmission power to the other wireless communication device in accordance with a request to increase the power, or the other wireless communication device regardless of whether there is a request to increase the transmission power from the other wireless communication device The transmission power control method according to claim 1, wherein the transmission power is controlled to increase.
前記受信信号における、現在の希望波の受信電界強度および過去の所定期間の希望波の平均受信電界強度を把握する受信電界強度把握手段と、
前記把握した現在の信号品質が前記過去の所定期間の平均信号品質よりも劣化している場合で、かつ、前記現在の希望波の受信電界強度が前記過去の所定期間の希望波の平均受信電界強度よりも劣化している場合には、前記他の無線通信装置への送信電力を増加させるように制御する送信電力制御手段と、を備えることを特徴とする無線通信装置。 A signal quality grasping means for grasping a current signal quality in a received signal from another wireless communication device and an average signal quality in a past predetermined period;
A received electric field strength grasping means for grasping a received electric field strength of a current desired wave and an average received electric field strength of a desired wave in a past predetermined period in the received signal;
When the grasped current signal quality is degraded from the average signal quality of the past predetermined period, and the received electric field strength of the current desired wave is the average received electric field of the desired wave of the past predetermined period A wireless communication apparatus comprising: a transmission power control unit configured to control transmission power to the other wireless communication apparatus to be increased when the strength is lower than the strength.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2015502096A (en) * | 2011-11-18 | 2015-01-19 | クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ | Devices and methods for enabling access probe sequences |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2015502096A (en) * | 2011-11-18 | 2015-01-19 | クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ | Devices and methods for enabling access probe sequences |
| US9241298B2 (en) | 2011-11-18 | 2016-01-19 | Qualcomm Incorporated | Devices and methods for facilitating access probe sequences |
| US9615316B2 (en) | 2011-11-18 | 2017-04-04 | Qualcomm Incorporated | Methods and devices for facilitating modified cell reselection parameters and procedures when access terminals exhibit little or no mobility |
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