JP2012231499A - Inter-cell interference suppression method, radio base station, mobile communication system, and user terminal - Google Patents

Inter-cell interference suppression method, radio base station, mobile communication system, and user terminal Download PDF

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JP2012231499A
JP2012231499A JP2012138729A JP2012138729A JP2012231499A JP 2012231499 A JP2012231499 A JP 2012231499A JP 2012138729 A JP2012138729 A JP 2012138729A JP 2012138729 A JP2012138729 A JP 2012138729A JP 2012231499 A JP2012231499 A JP 2012231499A
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radio base
base station
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Motoya Iwasaki
玄弥 岩崎
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NEC Corp
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Abstract

PROBLEM TO BE SOLVED: To reduce interference between cells and to improve throughput as a system.SOLUTION: In radio base stations 1-3, power of a user terminal during communication in a cell and interference wave power of the cell are measured respectively in a reception power measurement circuit 13 and an interference wave power measurement circuit 14, and power for each frequency within a reception band is recorded together with time information and notified to the radio base stations of peripheral cells. In the radio base station 1 of a cell C1, the notified information of the frequency/time of the interference wave power of a cell C2 and a cell C3 and the information of the frequency/time of reception power of each user terminal received in the cell C1 are compared to investigate correlation in a correlation circuit 15, and when a highly correlated user terminal is found, power control signals are generated in a power control signal generation circuit 16 and transmitted by a transmitter 12. The user terminal inside the cell C1, a user terminal 4 for instance, lowers the transmission power of a transmitter 22 when power control signals are detected in a power control signal detection circuit 23 after passing through a receiver 21.

Description

本発明は移動体通信システムに関し、特にセル間干渉抑圧方法に関する。   The present invention relates to a mobile communication system, and more particularly to a method for suppressing inter-cell interference.

移動体通信システムでは、周辺セル間の干渉が大きな問題である。   In mobile communication systems, interference between neighboring cells is a big problem.

ＣＤＭＡ（Ｃｏｄｅ Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅ Ａｃｃｅｓｓ）を用いた最近の移動通信システムでは、送信信号をセル毎あるいはユーザ毎に異なる符号で符号拡散し、受信側の逆拡散で拡散利得により干渉信号を相対的に抑圧することでこの問題を解決している。しかし、ＷＣＤＭＡ（Ｗｉｄｅｂａｎｄ ＣＤＭＡ）方式の上り回線のように、ユーザ間の符号が完全には直交していない場合には、他ユーザの信号が干渉となるため、ユーザ間の符号が直交している場合に比べ、収容可能なユーザ数が低下し、結果としてセル内の全ユーザの合計のデータ速度、すなわちセル容量が低下する。   In a recent mobile communication system using CDMA (Code Division Multiple Access), a transmission signal is code-spread with a different code for each cell or user, and an interference signal is relatively suppressed by spreading gain by despreading on the receiving side. This has solved this problem. However, when the codes between users are not completely orthogonal, as in a WCDMA (Wideband CDMA) system uplink, the signals of other users become interference, so the codes between users are orthogonal. Compared to the case, the number of users that can be accommodated decreases, and as a result, the total data rate of all users in the cell, ie, the cell capacity decreases.

ＣＤＭＡ以前のＦＤＭＡの移動体通信システムでは、隣り合うセル間で異なる周波数を割り当てることにより、干渉が生じないようにしているが、セル毎に使用できない周波数が生じることになり、周波数の利用効率が低下する。   In FDMA mobile communication systems prior to CDMA, different frequencies are allocated between adjacent cells so that interference does not occur. However, frequencies that cannot be used for each cell are generated, and frequency use efficiency is improved. descend.

次期移動体通信システムでは、ユーザ間の直交化を図るため、上り方向についてはＦＤＭＡ（Ｆｒｅｑｕｅｎｃｙ Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅ Ａｃｃｅｓｓ）を適用し、かつ、周波数の利用効率の低下を避けるため、隣り合うセル間でも同じ周波数を使用することが検討されている。セル間の干渉については、ＨＡＲＱ（Ｈｙｂｒｉｄ Ａｕｔｏｍａｔｉｃ Ｒｅｐｅａｔ ｒｅＱｕｅｓｔ）などの高速な再送方式を適用することである程度回避できると考えられているが、更なる工夫が望まれている。   In the next mobile communication system, in order to achieve orthogonalization between users, FDMA (Frequency Division Multiple Access) is applied in the uplink direction, and in order to avoid a decrease in frequency utilization efficiency, the same frequency is also used between adjacent cells. Is being considered for use. Inter-cell interference is considered to be avoided to some extent by applying a high-speed retransmission scheme such as HARQ (Hybrid Automatic Repeat reQuest), but further ingenuity is desired.

丸林元、中川正雄、河野隆二 共著「スペクトル拡散通信とその応用」、（社）電子情報通信学会、平成１０年５月１０日発行 Ｐ．１８８〜１９９Marubayashi, Masao Nakagawa, Ryuji Kawano, "Spread-Spectrum Communication and its Applications", IEICE, May 10, 1998 188-199 奥村喜久、進士昌明 監修「移動通信の基礎」、（社）電子情報通信学会、昭和６１年１０月１日 発行 Ｐ．１８８〜１９５Okumura Yoshihisa, Shinshi Masaaki Supervision "Basics of Mobile Communications", The Institute of Electronics, Information and Communication Engineers, October 1, 1986 188-195

本発明の目的は、セル間の干渉を低減し、システムとしてのスループットを改善することができるセル間干渉抑圧方法、無線基地局、ユーザ端末を提供することにある。   An object of the present invention is to provide an inter-cell interference suppression method, a radio base station, and a user terminal capable of reducing inter-cell interference and improving system throughput.

本発明の第１の態様では、各セルの無線基地局で測定された干渉波電力の周波数と時間の情報（干渉波電力プロファイル）を周辺のセルの無線基地局に通知し、該無線基地局が通知された周辺のセルの干渉波電力プロファイルと、自セルで受信している各ユーザ端末の電力プロファイルを比較し、相関性の高いユーザ端末を見つけた場合は、そのユーザ端末に対して送信電力を下げるように指示する。   In the first aspect of the present invention, the frequency and time information (interference wave power profile) of the interference wave power measured at the radio base station of each cell is notified to the radio base stations of the surrounding cells, and the radio base station Compare the interference wave power profile of the neighboring cell notified of with the power profile of each user terminal received in its own cell, and if a highly correlated user terminal is found, transmit it to that user terminal. Instruct to reduce power.

本発明の第２の態様では、各セルの無線基地局で測定された干渉波電力の周波数と時間の情報（干渉波電力プロファイル）を周辺のセルのユーザ端末に通知し、各セルのユーザ端末が、該ユーザ端末が送信した信号の周波数と時間の情報と、周辺のセルの無線基地局から通知された干渉波電力の周波数と時間の情報を比較し、相関性が高い場合に、自己の送信電力を下げる。   In the second aspect of the present invention, the frequency and time information (interference wave power profile) of the interference wave power measured at the radio base station of each cell is notified to the user terminals of the surrounding cells, and the user terminals of each cell Compares the frequency and time information of the signal transmitted by the user terminal with the frequency and time information of the interference wave power notified from the radio base stations of the neighboring cells. Reduce transmission power.

こうすることにより、周辺セルに対する干渉を低減させることができる。   By doing so, interference with neighboring cells can be reduced.

本発明は、セル間の干渉を低減し、システムとしてのスループットを改善することができる。   The present invention can reduce interference between cells and improve throughput as a system.

本発明の第１の実施形態の移動体通信システムの構成図である。1 is a configuration diagram of a mobile communication system according to a first embodiment of the present invention. 本発明の第２の実施形態の移動体通信システムの構成図である。It is a block diagram of the mobile communication system of the 2nd Embodiment of this invention.

次に、本発明の実施の形態について図面を参照して説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図１は本発明の第１の実施形態の移動体通信システムの構成図である。本実施形態は、３つのセルＣ１〜Ｃ３が、セルＣ１に対しセルＣ２とセルＣ３が周辺に位置するように存在し、セルＣ１内のユーザ端末の送信電力を下げる場合を想定している。セルＣ１〜Ｃ３にはそれぞれ無線基地局１〜３が存在する。無線基地局１は受信機１１と送信機１２と受信電力測定回路１３と干渉波電力測定回路１４と相関回路１５と電力制御信号生成回路１６とを有している。無線基地局２は受信機１１と受信電力測定回路１３と干渉波電力測定回路１４とを有している。無線基地局３は受信機１１と受信電力測定回路１３と干渉波電力測定回路１４とを有している。無線基地局２、３では送信機１２と相関回路１５と電力制御信号生成回路１６は、セルＣ１内のユーザ端末４の送信電力を下げる場合を想定しているため、図示されていない。また、無線基地局１〜３のその他の構成要素は、本発明と直接関係ないため図示されていない。ユーザ端末４は受信機２１と送信機２２と電力制御信号検出回路２３を有している。ユーザ端末４のその他の構成要素は、本発明と直接関係ないため図示されていない。セルＣ１内のその他のユーザ端末、セルＣ２、Ｃ３内のそのユーザ端末は説明を簡単にするために図示されていない。   FIG. 1 is a configuration diagram of a mobile communication system according to a first embodiment of this invention. In the present embodiment, it is assumed that three cells C1 to C3 exist so that the cells C2 and C3 are located in the vicinity of the cell C1, and the transmission power of the user terminal in the cell C1 is reduced. Radio base stations 1 to 3 exist in the cells C1 to C3, respectively. The radio base station 1 includes a receiver 11, a transmitter 12, a received power measurement circuit 13, an interference wave power measurement circuit 14, a correlation circuit 15, and a power control signal generation circuit 16. The radio base station 2 includes a receiver 11, a received power measurement circuit 13, and an interference wave power measurement circuit 14. The radio base station 3 includes a receiver 11, a received power measurement circuit 13, and an interference wave power measurement circuit 14. In the radio base stations 2 and 3, the transmitter 12, the correlation circuit 15, and the power control signal generation circuit 16 are not illustrated because it is assumed that the transmission power of the user terminal 4 in the cell C 1 is reduced. The other components of the radio base stations 1 to 3 are not shown because they are not directly related to the present invention. The user terminal 4 includes a receiver 21, a transmitter 22, and a power control signal detection circuit 23. Other components of the user terminal 4 are not shown because they are not directly related to the present invention. The other user terminals in the cell C1, the user terminals in the cells C2, C3 are not shown for the sake of simplicity.

次に、本実施形態の動作を説明する。   Next, the operation of this embodiment will be described.

各ユーザ端末からの上り送信は、各ユーザ端末が送信する時間（タイムスロット）と周波数をユーザ端末毎に変えることで複数のユーザ信号を多重化して行う。   Uplink transmission from each user terminal is performed by multiplexing a plurality of user signals by changing the time (time slot) and frequency transmitted by each user terminal for each user terminal.

各セルＣ１〜Ｃ３の無線基地局１〜３のスケジューラ（不図示）は、セル配下のユーザ端末に対し、送信する時間と周波数を指定する、時間および周波数のスケジューリングを行っている。   The schedulers (not shown) of the radio base stations 1 to 3 of the cells C1 to C3 perform time and frequency scheduling for designating the time and frequency to be transmitted to the user terminals under the cell.

それぞれの無線基地局１〜３は、受信電力測定回路１３と干渉波電力測定回路１４でそのセルで通信中のユーザ端末の電力と、そのセルの干渉波電力をそれぞれ測定し、受信帯域内の周波数毎の電力を時間情報とともに記録する。測定した干渉波電力の周波数・時間の情報は周辺のセルの無線基地局に通知される。セルＣ１の無線基地局１では、相関回路１５で、通知されたセルＣ２とセルＣ３の干渉波電力の周波数・時間情報と、セルＣ１で受信している各ユーザ端末の受信電力の周波数・時間の情報を比較し、相関性を調査する（例えば、相互相関を取る）。相関回路１５は、相関性の高いユーザ端末を見つけた場合は、そのユーザ端末に対して送信電力を下げるように指示する電力制御信号を電力制御信号生成回路１６で生成し、送信機１２より送信する。セルＣ１内のユーザ端末、たとえばユーザ端末４は電力制御信号を、受信機２１を経て電力制御信号検出回路２３で検出すると、送信機２２の送信電力を下げる。なお、干渉波電力の情報は、干渉波電力が閾値を越えた場合にのみ周辺のセルの無線基地局に通知するようにしてもよい。   Each of the radio base stations 1 to 3 measures the power of the user terminal communicating with the cell by the reception power measurement circuit 13 and the interference wave power measurement circuit 14 and the interference wave power of the cell, respectively. Record the power for each frequency along with the time information. Information on the frequency and time of the measured interference wave power is notified to the radio base stations of the neighboring cells. In the radio base station 1 of the cell C1, the correlation circuit 15 notifies the frequency / time information of the interference wave power of the cells C2 and C3 and the frequency / time of the received power of each user terminal received in the cell C1. Are compared and the correlation is investigated (for example, cross-correlation is taken). When the correlation circuit 15 finds a user terminal with high correlation, the correlation control circuit 15 generates a power control signal for instructing the user terminal to lower the transmission power by the power control signal generation circuit 16 and transmits it from the transmitter 12. To do. When the user terminal in the cell C1, for example, the user terminal 4 detects the power control signal via the receiver 21 by the power control signal detection circuit 23, the transmission power of the transmitter 22 is reduced. The information on the interference wave power may be notified to the radio base stations of the neighboring cells only when the interference wave power exceeds the threshold.

図２は本発明の第２の実施形態の移動体通信システムの構成図である。本実施形態は、３つのセルＣ１〜Ｃ３が、セルＣ１に対しセルＣ２とセルＣ３が周辺に位置するように存在し、セルＣ１内のユーザ端末の送信電力を下げる場合を想定している。セルＣ１〜Ｃ３にはそれぞれ無線基地局１〜３が存在する。無線基地局１〜３は同じ構成で、受信機１１と送信機１２と干渉波電力測定回路１４と電力情報信号生成回路１７とを有している。無線基地局２は受信機１１と受信電力測定回路１３と干渉波電力測定回路１４とを有している。無線基地局１〜３のその他の構成要素は、本発明と直接関係ないため図示されていない。ユーザ端末４は受信機２１と送信機２２と相関回路２４を有している。ユーザ端末４のその他の構成要素は、本発明と直接関係ないため図示されていない。セルＣ１内のその他のユーザ端末、セルＣ２、Ｃ３内のそのユーザ端末は説明を簡単にするために図示されていない。   FIG. 2 is a configuration diagram of a mobile communication system according to the second embodiment of this invention. In the present embodiment, it is assumed that three cells C1 to C3 exist so that the cells C2 and C3 are located in the vicinity of the cell C1, and the transmission power of the user terminal in the cell C1 is reduced. Radio base stations 1 to 3 exist in the cells C1 to C3, respectively. The radio base stations 1 to 3 have the same configuration, and include a receiver 11, a transmitter 12, an interference wave power measurement circuit 14, and a power information signal generation circuit 17. The radio base station 2 includes a receiver 11, a received power measurement circuit 13, and an interference wave power measurement circuit 14. Other components of the radio base stations 1 to 3 are not shown because they are not directly related to the present invention. The user terminal 4 includes a receiver 21, a transmitter 22, and a correlation circuit 24. Other components of the user terminal 4 are not shown because they are not directly related to the present invention. The other user terminals in the cell C1, the user terminals in the cells C2, C3 are not shown for the sake of simplicity.

各ユーザ端末からの上り送信は、各ユーザ端末が送信する時間（タイムスロット）と周波数をユーザ端末毎に変えることで複数のユーザ信号を多重化して行う。   Uplink transmission from each user terminal is performed by multiplexing a plurality of user signals by changing the time (time slot) and frequency transmitted by each user terminal for each user terminal.

各セルＣ１〜Ｃ３の無線基地局１〜３のスケジューラ（不図示）は、セル配下のユーザ端末に対し、送信する時間と周波数を指定する、時間および周波数のスケジューリングを行っている。   The schedulers (not shown) of the radio base stations 1 to 3 of the cells C1 to C3 perform time and frequency scheduling for designating the time and frequency to be transmitted to the user terminals under the cell.

それぞれのセルＣ１〜Ｃ３の無線基地局１〜３では、干渉波電力測定回路１４でそのセルの干渉波電力を、受信帯域内の周波数毎に時間情報とともに測定し、測定した干渉波電力の周波数・時間情報を電力情報信号生成回路１７で生成し、送信機１２よりユーザ端末に送信する。セルＣ１内のユーザ端末、たとえばユーザ端末４は、相関回路２４で、周辺のセルＣ２、Ｃ３から受信した干渉波電力の周波数・時間情報と、自らが送信した信号の周波数・時間情報を比較して、相関性を調査し、相関性が高い場合には送信電力を下げるように送信機２２を制御する。なお、干渉波電力の情報は、干渉波電力が閾値を越えた場合にのみ周辺のセルのユーザ端末に通知するようにしてもよい。   In the radio base stations 1 to 3 of the cells C1 to C3, the interference wave power measurement circuit 14 measures the interference wave power of the cell together with time information for each frequency within the reception band, and the frequency of the measured interference wave power. Time information is generated by the power information signal generation circuit 17 and transmitted from the transmitter 12 to the user terminal. The user terminal in the cell C1, for example, the user terminal 4 compares the frequency / time information of the interference wave power received from the surrounding cells C2 and C3 with the frequency / time information of the signal transmitted by the user terminal 4 in the correlation circuit 24. Then, the correlation is investigated, and when the correlation is high, the transmitter 22 is controlled so as to reduce the transmission power. The information on the interference wave power may be notified to the user terminals in the neighboring cells only when the interference wave power exceeds the threshold.

Ｃ１〜Ｃ３ セル
１〜３ 無線基地局
４ ユーザ端末
１１ 受信機
１２ 送信機
１３ 受信電力測定回路
１４ 干渉波電力測定回路
１５ 相関回路
１６ 電力制御信号生成回路
１７ 電力情報信号生成回路
２１ 受信機
２２ 送信機
２３ 電力制御信号検出回路
２４ 相関回路 C1 to C3 cells 1 to 3 radio base stations 4 user terminals 11 receivers 12 transmitters 13 received power measurement circuits 14 interference wave power measurement circuits 15 correlation circuits 16 power control signal generation circuits 17 power information signal generation circuits 21 receivers 22 transmissions Machine 23 Power control signal detection circuit 24 Correlation circuit

Claims (12)

ユーザ端末と、無線基地局と、前記無線基地局の周辺の無線基地局と、を備え、
前記無線基地局と前記周辺の無線基地局が上りリンクで同じ周波数を使用し、前記ユーザ端末の各々が送信するタイムスロットと周波数を前記ユーザ端末毎に変えることにより複数のユーザ信号を多重する、上りリンクがＦＤＭＡ方式の移動体通信システムであって、
前記無線基地局は、
前記無線基地局が形成するセルにおける干渉波電力を測定する手段と、
前記測定した干渉波電力の周波数の情報を含む干渉情報を、前記周辺の無線基地局に送信する手段と、を備え、
前記周辺の無線基地局は、
前記無線基地局から前記干渉情報を受信する手段と、
前記周辺の無線基地局が形成するセル内の前記ユーザ端末に対し、タイムスロットおよび周波数のスケジューリングを行う手段と、を備え、
前記ユーザ端末は、
前記周辺の無線基地局による前記スケジューリングにより指定された前記タイムスロットおよび前記周波数に従って上りリンクのユーザ信号を送信する手段を備える、
移動体通信システム。 A user terminal, a radio base station, and a radio base station around the radio base station,
The radio base station and the neighboring radio base stations use the same frequency in the uplink, and a plurality of user signals are multiplexed by changing the time slot and frequency transmitted by each of the user terminals for each user terminal, The uplink is a FDMA mobile communication system,
The radio base station is
Means for measuring interference power in a cell formed by the radio base station;
Means for transmitting interference information including frequency information of the measured interference wave power to the surrounding radio base stations,
The surrounding radio base stations are
Means for receiving the interference information from the radio base station;
Means for scheduling time slots and frequencies for the user terminals in the cell formed by the surrounding radio base stations,
The user terminal is
Means for transmitting an uplink user signal according to the time slot and the frequency specified by the scheduling by the neighboring radio base stations;
Mobile communication system. 前記干渉情報は、前記測定した干渉波電力のタイムスロットの情報をさらに含む、
請求項１に記載の移動体通信システム。 The interference information further includes time slot information of the measured interference wave power,
The mobile communication system according to claim 1. 前記周辺の無線基地局は、前記周辺の無線基地局が形成するセル内の前記ユーザ端末に対し、前記無線基地局から受信した前記干渉情報に基づいて、送信電力を下げるように指示する手段をさらに備える、
請求項１または２に記載の移動体通信システム。 The peripheral radio base station is configured to instruct the user terminal in a cell formed by the peripheral radio base station to reduce transmission power based on the interference information received from the radio base station. In addition,
The mobile communication system according to claim 1 or 2. ユーザ端末と、無線基地局と、前記無線基地局の周辺の無線基地局と、を備え、
前記無線基地局と前記周辺の無線基地局が上りリンクで同じ周波数を使用し、前記ユーザ端末の各々が送信するタイムスロットと周波数を前記ユーザ端末毎に変えることにより複数のユーザ信号を多重する、上りリンクがＦＤＭＡ方式の移動体通信システムにおける無線基地局であって、
前記無線基地局が形成するセルにおける干渉波電力を測定する手段と、
前記測定した干渉波電力の周波数の情報を含む干渉情報を、前記周辺の無線基地局に送信する手段と、を備える、
無線基地局。 A user terminal, a radio base station, and a radio base station around the radio base station,
The radio base station and the neighboring radio base stations use the same frequency in the uplink, and a plurality of user signals are multiplexed by changing the time slot and frequency transmitted by each of the user terminals for each user terminal, The uplink is a radio base station in an FDMA mobile communication system,
Means for measuring interference power in a cell formed by the radio base station;
Means for transmitting interference information including frequency information of the measured interference wave power to the surrounding radio base stations,
Radio base station. 前記干渉情報は、前記測定した干渉波電力のタイムスロットの情報をさらに含む、
請求項４に記載の無線基地局。 The interference information further includes time slot information of the measured interference wave power,
The radio base station according to claim 4. 前記無線基地局が形成するセル内の前記ユーザ端末に対し、前記周辺の無線基地局から受信した前記干渉情報に基づいて、送信電力を下げるように指示する手段をさらに備える、
請求項４または５に記載の無線基地局。 Means for instructing the user terminal in a cell formed by the radio base station to reduce transmission power based on the interference information received from the neighboring radio base stations;
The radio base station according to claim 4 or 5. ユーザ端末と、無線基地局と、前記無線基地局の周辺の無線基地局と、を備え、
前記無線基地局と前記周辺の無線基地局が上りリンクで同じ周波数を使用し、前記ユーザ端末の各々が送信するタイムスロットと周波数を前記ユーザ端末毎に変えることにより複数のユーザ信号を多重する、上りリンクがＦＤＭＡ方式の移動体通信システムにおけるユーザ端末であって、
前記無線基地局が形成するセルにおける干渉波電力を測定する前記無線基地局から、前記測定した干渉波電力の周波数の情報を含む干渉情報を受信する、前記周辺の無線基地局と通信する手段と、
前記周辺の無線基地局によるタイムスロットおよび周波数のスケジューリングにより指定された前記タイムスロットおよび前記周波数に従って上りリンクのユーザ信号を送信する手段と、を備える、
ユーザ端末。 A user terminal, a radio base station, and a radio base station around the radio base station,
The radio base station and the neighboring radio base stations use the same frequency in the uplink, and a plurality of user signals are multiplexed by changing the time slot and frequency transmitted by each of the user terminals for each user terminal, The uplink is a user terminal in a mobile communication system of FDMA system,
Means for receiving interference information including frequency information of the measured interference wave power from the radio base station that measures interference wave power in a cell formed by the radio base station, and means for communicating with the surrounding radio base stations; ,
Means for transmitting an uplink user signal according to the time slot and the frequency specified by the time slot and frequency scheduling by the neighboring radio base stations,
User terminal. 前記干渉情報は、前記測定した干渉波電力のタイムスロットの情報をさらに含む、
請求項７に記載のユーザ端末。 The interference information further includes time slot information of the measured interference wave power,
The user terminal according to claim 7. 前記周辺の無線基地局が前記無線基地局から受信した前記干渉情報に基づいてなされた送信電力を下げる指示に従って、送信電力を下げる手段をさらに備える、
請求項７または８に記載のユーザ端末。 The peripheral radio base station further comprises means for lowering transmission power in accordance with an instruction to lower transmission power made based on the interference information received from the radio base station.
The user terminal according to claim 7 or 8. ユーザ端末と、無線基地局と、前記無線基地局の周辺の無線基地局と、を備え、
前記無線基地局と前記周辺の無線基地局が上りリンクで同じ周波数を使用し、前記ユーザ端末の各々が送信するタイムスロットと周波数を前記ユーザ端末毎に変えることにより複数のユーザ信号を多重する、上りリンクがＦＤＭＡ方式の移動体通信システムにおけるセル間干渉抑圧方法であって、
前記無線基地局が、前記無線基地局が形成するセルにおける干渉波電力を測定するステップと、
前記無線基地局が、前記測定した干渉波電力の周波数の情報を含む干渉情報を、前記周辺の無線基地局に送信するステップと、
前記周辺の無線基地局が、前記無線基地局から前記干渉情報を受信するステップと、を含む、
セル間干渉抑圧方法。 A user terminal, a radio base station, and a radio base station around the radio base station,
The radio base station and the neighboring radio base stations use the same frequency in the uplink, and a plurality of user signals are multiplexed by changing the time slot and frequency transmitted by each of the user terminals for each user terminal, An uplink is a method for suppressing inter-cell interference in a mobile communication system using FDMA,
The radio base station measuring interference wave power in a cell formed by the radio base station;
The radio base station transmitting interference information including frequency information of the measured interference wave power to the neighboring radio base stations;
The neighboring radio base stations receiving the interference information from the radio base station,
Inter-cell interference suppression method. 前記干渉情報は、前記測定した干渉波電力のタイムスロットの情報をさらに含む、
請求項１０に記載のセル間干渉抑圧方法。 The interference information further includes time slot information of the measured interference wave power,
The inter-cell interference suppression method according to claim 10. 前記周辺の無線基地局が、前記周辺の無線基地局が形成するセル内の前記ユーザ端末に対し、前記無線基地局から受信した前記干渉情報に基づいて、送信電力を下げるように指示するステップをさらに有する、
請求項１０または１１に記載のセル間干渉抑圧方法。 A step in which the neighboring radio base station instructs the user terminal in a cell formed by the neighboring radio base station to reduce transmission power based on the interference information received from the radio base station; In addition,
The inter-cell interference suppression method according to claim 10 or 11.
JP2012138729A 2012-06-20 2012-06-20 Inter-cell interference suppression method, radio base station, mobile communication system, and user terminal Pending JP2012231499A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006099548A1 (en) * 2005-03-15 2006-09-21 Qualcomm Incorporated Interference control in a wireless communication system
WO2006098665A1 (en) * 2005-03-14 2006-09-21 Telefonaktiebolaget Lm Ericsson (Publ) Method and arrangement for improved handover by muting interfering nodes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006098665A1 (en) * 2005-03-14 2006-09-21 Telefonaktiebolaget Lm Ericsson (Publ) Method and arrangement for improved handover by muting interfering nodes
WO2006099548A1 (en) * 2005-03-15 2006-09-21 Qualcomm Incorporated Interference control in a wireless communication system

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