JP2000078644A - Dynamic channel selecting method for radio communication system, and radio transmitter-receiver of base station using the method - Google Patents
Dynamic channel selecting method for radio communication system, and radio transmitter-receiver of base station using the methodInfo
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- JP2000078644A JP2000078644A JP10245500A JP24550098A JP2000078644A JP 2000078644 A JP2000078644 A JP 2000078644A JP 10245500 A JP10245500 A JP 10245500A JP 24550098 A JP24550098 A JP 24550098A JP 2000078644 A JP2000078644 A JP 2000078644A
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- Prior art keywords
- transmission
- channel
- level
- interference wave
- reception
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Abstract
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、ＴＤＭＡ−ＴＤＤ
方式で通信を行う無線通信システムにおけるチャネル選
択方法およびその方法を適用した基地局の無線送受信装
置に関する。The present invention relates to a TDMA-TDD.
TECHNICAL FIELD The present invention relates to a channel selection method in a wireless communication system that performs communication according to a scheme, and a wireless transmission / reception device of a base station to which the method is applied.
【０００２】[0002]
【従来の技術】
例えば、ＴＤＭＡ─ＴＤＤ通信の一
つであるＰＨＳにおいては、基地局はチャネルを使用す
る前に、受信タイミングでキャリアセンスを行ってい
る。そして、干渉波レベルが２６ｄＢμＶ以下のチャネ
ルは使用でき、また、全チャネルが２６ｄＢμＶを超え
る場合には、４０ｄＢμＶ以下のチャネルが使用できる
旨が規定されている（ＲＣＲ─ＳＴＤ２８）。しかしな
がら、送信タイミングにおける干渉波レベルについては
何ら規定されていない。したがって、従来のＰＨＳ基地
局では、使用中でないタイムスロットがある場合、受信
タイミングにおける全周波数キャリアセンスを順次行
い、無線チャネルを使用する必要が生じたときには、直
前の受信タイミングにおけるキャリアセンス結果を参照
し干渉の少ないチャネルを優先的に選択して使用するこ
とにより通信品質を確保している。[Prior art]
For example, in PHS, which is one of the TDMA @ TDD communications, the base station performs carrier sense at reception timing before using a channel. It is specified that channels having an interference wave level of 26 dBμV or less can be used, and that if all channels exceed 26 dBμV, channels of 40 dBμV or less can be used (RCR─STD28). However, the interference wave level at the transmission timing is not specified at all. Therefore, in the conventional PHS base station, when there is a time slot that is not being used, all frequency carrier sensing at the reception timing is sequentially performed, and when it becomes necessary to use the radio channel, the carrier sensing result at the immediately preceding reception timing is referred to. Then, communication quality is ensured by preferentially selecting and using a channel with less interference.
【０００３】[0003]
【発明が解決しようとする課題】ところで、ＰＨＳのよ
うなＴＤＭＡ−ＴＤＤ方式の通信においては、受信タイ
ミングにおける干渉波と、送信タイミングにおける干渉
波の発生源が異なるため、送信タイミングの干渉波レベ
ルと受信タイミングの干渉波レベルの相関が低い。ま
た、ＰＨＳ通信では、基地局の送信出力の上限が５００
ｍＷであり、周辺基地局の送信出力が５００ｍＷで、端
末の送信出力は１０ｍＷであることから、送信出力の差
により、受信タイミングで干渉波が存在しなくても送信
タイミングでは存在することもあり得る。By the way, in the communication of the TDMA-TDD system such as PHS, since the interference wave at the reception timing and the generation source of the interference wave at the transmission timing are different, the interference wave level at the transmission timing is different. The correlation of the interference wave level at the reception timing is low. In PHS communication, the upper limit of the transmission output of the base station is 500
mW, the transmission power of the peripheral base station is 500 mW, and the transmission power of the terminal is 10 mW. Therefore, due to the difference in the transmission power, even if there is no interference wave at the reception timing, it may be present at the transmission timing. obtain.
【０００４】図２Ａ，図２Ｂは、ＴＤＭＡ−ＴＤＤ通信
における基地局と端末との干渉状態を説明するための概
略図である。ビル７の屋上に基地局（ＣＳ１）１３が、
ビル８の屋上に基地局（ＣＳ２）１４が、ビル９の屋上
に基地局（ＣＳ３）１５がそれぞれ設置され、ビル７と
８の間にＰＨＳ（ＰＳ１）１０が、ビル８と９の間にＰ
ＨＳ（ＰＳ２）１１が、ビル９の右サイドにＰＨＳ（Ｐ
Ｓ３）１２がそれぞれ存在しているとする。電波の送受
関係は図２Ａに示すようになる。FIGS. 2A and 2B are schematic diagrams for explaining the interference state between a base station and a terminal in TDMA-TDD communication. The base station (CS1) 13 is on the roof of building 7,
A base station (CS2) 14 is installed on the roof of the building 8, and a base station (CS3) 15 is installed on the roof of the building 9. A PHS (PS1) 10 is located between the buildings 7 and 8, and a PHS (PS1) 10 is located between the buildings 8 and 9. P
HS (PS2) 11 moves PHS (P2) to the right side of Building 9.
S3) It is assumed that each of 12 exists. The relationship between the transmission and reception of radio waves is as shown in FIG. 2A.
【０００５】ここでＰＨＳ（ＰＳ１）１０における送受
信タイミングは、図２Ｂに示すようになり、かかる場
合、ＰＨＳ（ＰＳ１）１０は受信時には基地局の送信出
力が５００ｍＷと高く、全基地局の送信タイミングがＰ
Ｓの受信タイミングと一致することからＰＨＳ（ＰＳ
１）１０の受信スロットは大きく干渉を受ける。一方、
基地局（ＣＳ１）１３における送受信タイミングは受信
時、周辺のＰＨＳ（ＰＳ２）１１，ＰＨＳ（ＰＳ３）１
２からの妨害波は送信出力が弱く、ビル８および９によ
る減衰も大きいため、基地局（ＣＳ１）１３の受信スロ
ットは大きな干渉を受けることはない。[0005] Here, the transmission / reception timing in the PHS (PS1) 10 is as shown in FIG. 2B. In such a case, the transmission power of the PHS (PS1) 10 is as high as 500 mW during reception, and the transmission timing of all base stations is high. Is P
PHS (PS)
1) The ten receiving slots are greatly interfered. on the other hand,
The transmission / reception timing at the base station (CS1) 13 is as follows: when receiving, the surrounding PHS (PS2) 11, PHS (PS3) 1
Since the transmission power of the interference wave from station 2 is weak and the attenuation by the buildings 8 and 9 is large, the reception slot of the base station (CS1) 13 does not receive much interference.
【０００６】このように基地局の受信側の品質が良くて
移動通信端末に割り当てたチャネルでも、移動通信端末
にとっては品質が悪いことがある。したがって基地局側
の受信タイミングの干渉波レベルだけを参照してチャネ
ル選択を行うと、移動通信端末側の品質が悪いチャネル
を使用してしまうことがあり、必ずしも良い無線品質を
提供できるとは限らないという問題があった。特にトラ
フィックが高く空きチャネルが少ない都市中心部などに
おいてはその影響は顕著である。[0006] Even a channel assigned to a mobile communication terminal with good quality on the receiving side of the base station as described above may have poor quality for the mobile communication terminal. Therefore, if channel selection is performed only by referring to the interference wave level of the reception timing on the base station side, a channel with poor quality on the mobile communication terminal side may be used, and good radio quality cannot always be provided. There was no problem. In particular, the effect is remarkable in a city center where traffic is high and there are few empty channels.
【０００７】本発明の目的は、上り通信電力と下り通信
電力の差が大きい場合にも、基地局側、移動通信端末側
ともに干渉波レベルが低く品質の良いチャネルを基地局
が選択でき、通信品質の改善に寄与することができる無
線通信システムにおけるダイナミックチャネル選択方法
を提供することにある。本発明の他の目的は、上記ダイ
ナミックチャネル選択方法を簡易な構成および簡易なア
ルゴリズムで実現することができる基地局の無線送受信
装置を提供することにある。An object of the present invention is to enable a base station to select a channel having a low interference wave level and a high quality on both the base station side and the mobile communication terminal side even when the difference between the uplink communication power and the downlink communication power is large. An object of the present invention is to provide a dynamic channel selection method in a wireless communication system that can contribute to quality improvement. Another object of the present invention is to provide a base station radio transmitting / receiving apparatus that can realize the above dynamic channel selection method with a simple configuration and a simple algorithm.
【０００８】[0008]
【課題を解決するための手段】前記目的を達成するため
に本発明による無線通信システムにおけるダイナミック
チャネル選択方法は、ＴＤＭＡ−ＴＤＤ方式で通信を行
う無線通信システムにおけるチャネル選択方法におい
て、基地局の無線送受信装置は、移動通信端末から電波
を受信する受信タイミングだけでなく送信タイミングで
も干渉波測定を行い、この干渉レベル情報を元に干渉の
少ないチャネルを選択するように構成されている。本発
明は上記構成において、前記干渉波測定は、前記無線送
受信装置が使用中でないタイムスロットに対して常時行
って最新の送受信タイミングの干渉波レベル測定結果を
メモリ部に記憶しておき、新たに無線チャネルの使用が
生じたとき、前記メモリ部の最新の干渉波レベル情報を
用いるか、または通信端末から通信チャネルを要求され
てから使用可能なタイムスロットにおいて所定数の周波
数のチャネルを選択して送受信タイミングの干渉波レベ
ルの測定を行い、それを干渉波レベル情報として用いる
ようにしてある。また、本発明は上記構成において、移
動通信端末から受信した制御信号の受信レベルをＤ波レ
ベルとし、直前にキャリアセンスで取得した受信タイミ
ングの干渉波レベルをＵ波とし、送受信タイミングでの
干渉波レベルと、前記Ｄ波レベルおよびＵ波レベルの比
を参照してチャネルを選択するようにしてある。さらに
前記他の目的を達成するために本発明による基地局の無
線送受信装置は、複数のアンテナと、前記複数のアンテ
ナをそれぞれ送信側と受信側に切り替える送受切替手段
と、データおよび制御信号を送信する送信回路と、前記
送信回路の出力を前記送受切替手段の複数の送信端のい
ずれかを選択する送信アンテナ選択手段と、前記送受切
替手段の複数の受信端のそれぞれを入力とし、送受信タ
イミングでの受信ＲＳＳＩレベルを出力する受信回路
と、受信タイミングおよび送信タイミングでの干渉波測
定を行ってチャネルを選択する制御手段とから構成され
ている。また、本発明は上記構成において、前記送信回
路の出力および前記受信回路の入力にそれぞれ接続さ
れ、タイムスロットの使用／不使用により１バースト単
位で切替え可能な送受切替信号を前記送受切替手段に送
出するとともに前記受信回路からの送受信タイミングで
の受信ＲＳＳＩレベルを受け、この受信ＲＳＳＩレベ
ル，移動端末から受信した制御信号を出力する無線制御
部と、前記無線制御部から得られた送受信タイミングの
受信ＲＳＳＩレベル，制御信号に基づき最も干渉波の少
ないチャネルを選択し、その選択結果を前記無線制御部
に指示する主制御部とから構成されている。In order to achieve the above object, a dynamic channel selection method in a wireless communication system according to the present invention is directed to a channel selection method in a wireless communication system that performs communication in a TDMA-TDD system. The transmission / reception device is configured to perform interference wave measurement not only at the reception timing of receiving a radio wave from the mobile communication terminal but also at the transmission timing, and to select a channel with less interference based on the interference level information. According to the present invention, in the above-described configuration, the interference wave measurement is always performed for a time slot that is not used by the wireless transmission / reception device, an interference wave level measurement result of the latest transmission / reception timing is stored in a memory unit, and a new When the use of a wireless channel occurs, use the latest interference wave level information of the memory unit, or select a channel of a predetermined number of frequencies in a time slot available after a communication channel is requested from a communication terminal. The interference wave level at the transmission / reception timing is measured and used as interference wave level information. Further, according to the present invention, in the above configuration, the reception level of the control signal received from the mobile communication terminal is set to the D-wave level, the interference wave level of the reception timing acquired immediately before by carrier sense is set to the U-wave, A channel is selected with reference to a level and a ratio of the D wave level and the U wave level. In order to achieve the above and other objects, a base transceiver station according to the present invention further comprises a plurality of antennas, transmission / reception switching means for switching the plurality of antennas between a transmitting side and a receiving side, and transmitting data and control signals. A transmitting circuit, a transmitting antenna selecting means for selecting an output of the transmitting circuit from among a plurality of transmitting ends of the transmitting / receiving switching means, and a plurality of receiving ends of the transmitting / receiving switching means as inputs, and transmitting / receiving at a transmission / reception timing. And a control means for measuring interference waves at reception timing and transmission timing to select a channel. Further, according to the present invention, in the above configuration, a transmission / reception switching signal connected to an output of the transmission circuit and an input of the reception circuit and capable of switching in units of one burst by use / non-use of a time slot is transmitted to the transmission / reception switching means. A radio control unit for receiving a reception RSSI level at the transmission / reception timing from the reception circuit and outputting a control signal received from the mobile terminal; and a reception RSSI for transmission / reception timing obtained from the radio control unit. The main control unit selects a channel with the least interference wave based on the level and the control signal, and instructs the radio control unit of the selection result.
【０００９】[0009]
【発明の実施の形態】以下、図面を参照して本発明の実
施の形態を詳しく説明する。図１は、本発明によるチャ
ネル選択方法を用いた無線基地局の無線送受信装置の実
施の形態を示すブロック図である。無線制御部２は、制
御信号である送受切替信号ａ，送信アンテナ選択信号ｂ
により１バースト毎に、送信アンテナの選択を行い送信
ダイバーシチを実現する送信アンテナ選択スイッチ４お
よび送信回路３の出力と受信回路７の入力との切替えを
行う送受切替スイッチ５を制御している。送受切替スイ
ッチ５は４個の連動するスイッチング回路を持ち、各ス
イッチ回路の共通端にはアンテナ６ａ，６ｂ，６ｃおよ
び６ｄが接続されている。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a radio transmitting / receiving apparatus of a radio base station using a channel selection method according to the present invention. The wireless control unit 2 includes a transmission / reception switching signal a and a transmission antenna selection signal b, which are control signals.
Thus, a transmission antenna selection switch 4 for selecting a transmission antenna and realizing transmission diversity for each burst and a transmission / reception switch 5 for switching between the output of the transmission circuit 3 and the input of the reception circuit 7 are controlled. The transmission / reception switch 5 has four interlocking switching circuits, and antennas 6a, 6b, 6c and 6d are connected to a common end of each switch circuit.
【００１０】従来の基地局においては、空きスロットに
おいてキャリアセンスは、受信タイミングのみで行うた
め、スロットが使用中であってもアイドル状態であって
も送信タイミングでは送受切替スイッチは送信回路へス
イッチングしていた。しかしながら、本発明による基地
局の無線通信装置では、アイドル状態のスロットにおい
ては送信タイミングの干渉波測定を行うため、送信タイ
ミングでも受信側にスイッチングするように制御してい
る。無線制御部２は使用中でないタイムスロットの受信
タイミング，送信タイミングそれぞれについて、受信回
路７より送受信タイミングの干渉波レベルＲＳＳＩを受
け、１周波数あたり４バースト連続で干渉波レベル測定
を行い、終了するとつぎに別の周波数の干渉波レベル測
定を行い、順番に全周波数の測定を行う。全周波数の測
定が終了した時点で、最初の周波数から再度測定を行
い、測定結果を順次更新していく。In a conventional base station, carrier sensing is performed only at the reception timing in an empty slot, so that the transmission / reception switch switches to the transmission circuit at the transmission timing regardless of whether the slot is in use or idle. I was However, in the wireless communication device of the base station according to the present invention, in order to measure the interference wave at the transmission timing in the idle slot, control is performed to switch to the reception side even at the transmission timing. The radio controller 2 receives the interference wave level RSSI of the transmission / reception timing from the reception circuit 7 for each of the reception timing and the transmission timing of the time slot that is not being used, and measures the interference wave level for four consecutive bursts per frequency. Then, the interference wave level of another frequency is measured, and all the frequencies are measured in order. When the measurement of all frequencies is completed, the measurement is performed again from the first frequency, and the measurement results are sequentially updated.
【００１１】これにより各空きスロットにおける最新の
送受信タイミングの干渉波レベル測定結果が常時、無線
制御部２のメモリ部２ａに保存される。新たに無線チャ
ネルを使用する必要が生じた場合、無線制御部２のメモ
リ部２ａより読み出され主制御部１に全空きスロットの
送信タイミング、受信タイミングの干渉波レベル（ＲＳ
ＳＩ）が通知される。As a result, the interference wave level measurement result of the latest transmission / reception timing in each empty slot is always stored in the memory unit 2a of the wireless control unit 2. When it becomes necessary to use a new radio channel, the main controller 1 reads out from the memory section 2a of the radio controller 2 and transmits the interference timings (RS
SI) is notified.
【００１２】主制御部１は、無線制御部２から通知され
た干渉波レベル情報を元に最良チャネルを選択するチャ
ネル選択手段を備えている。主制御部２のチャネル選択
手段は以下のアルゴリズムでチャネル選択を行う。1)各
無線チャネル（周波数、スロット番号）の送信タイミン
グ（Ｔｘ）干渉波レベルと受信タイミング（Ｒｘ）干渉
波レベルをペアにして、Ｔｘレベルの低い順にソートし
てチャネル優先順位付けを行う。なお、Ｔｘレベルが同
一レベルの場合は、周波数、スロット番号により順位付
けされる。 2)優先順位の高いチャネルより順に、Ｒｘ干渉波レベル
をチェックし、Ｒｘ干渉波レベルが第１レベル（２６ｄ
ＢμＶ）以下の場合、そのチャネルを使用する。 3)Ｒｘ干渉波レベルが第１レベルを超えている場合は次
の順位のチャネルのＲｘ干渉波レベルを同様の基準で判
定する。 4)全チャネルのＲｘ干渉波レベルを測定した結果、すべ
て第１レベルを越えていた場合には、再度優先順位の高
いチャネルより順に、Ｒｘ干渉波レベルが第２レベル
（４０ｄＢμＶ）以下であるかどうかを判定し、第２レ
ベル以下ならそのチャネルを使用する。 5)全チャネルが第２レベルを越えている場合は、使用可
能なチャネルがないため、無線チャネルの割り当てを拒
否する。以上のアルゴリズムにより、上りリンクについ
ては、第１レベルまたは第２レベルというスレッシュ値
以下のチャネルが使用されるため、ある程度の品質は確
保できる。下りリンクについてはできるかぎり下り干渉
波レベルの低いチャネルを使用するため、通信端末から
みても良いチャネルが割り当てられる可能性が高い。The main control unit 1 has a channel selecting means for selecting the best channel based on the interference wave level information notified from the radio control unit 2. The channel selection means of the main control unit 2 selects a channel by the following algorithm. 1) The transmission timing (Tx) interference wave level and the reception timing (Rx) interference wave level of each wireless channel (frequency, slot number) are paired, and sorted in ascending order of Tx level, and channel prioritization is performed. If the Tx levels are the same, the order is determined by frequency and slot number. 2) The Rx interference wave level is checked in order from the channel having the highest priority, and the Rx interference wave level is set to the first level (26d
BμV) or less, use that channel. 3) When the Rx interference wave level exceeds the first level, the Rx interference wave level of the next-ranked channel is determined based on the same reference. 4) As a result of measuring the Rx interference wave levels of all the channels, if all of them exceed the first level, whether the Rx interference wave levels are lower than the second level (40 dBμV) in order from the channel having the highest priority again It is determined whether the channel is lower than the second level. 5) If all the channels exceed the second level, there is no usable channel, so the assignment of the wireless channel is rejected. According to the above algorithm, for the uplink, a channel having a threshold value equal to or lower than the first level or the second level is used, and therefore, a certain level of quality can be secured. For the downlink, a channel with a low downlink interference wave level is used as much as possible, so that there is a high possibility that a channel that is good from the viewpoint of the communication terminal is allocated.
【００１３】無線制御部２は、さらに通信端末から受信
した制御信号（リンクチャネル確立（再）要求メッセー
ジ）を受信部６より受け、その受信レベルを測定する。
無線制御部２は、制御信号の受信レベルをＤ（Desire)
波レベルとし、直前に測定した受信タイミングの干渉波
レベルをＵ（Undesire) 波レベルとしてＤ／Ｕ比を計算
する。そして、その情報は主制御部１に送られ、チャネ
ル選択時に、受信タイミングの干渉波レベルを第１レベ
ル、第２レベルと比較する代わりに、Ｄ／Ｕ比にしきい
値を設定し、そのしきい値と計算されたＤ／Ｕ比を比較
することにより、受信側での通話品質が悪化することを
防げる。以上の構成も上記アルゴリズムに加えられてい
る。以下、送信タイミング（Ｔｘ）干渉波レベルの低い
順に受信タイミングの干渉波レベルが第１レベルまたは
第２レベル以下で、かつＤ／Ｕ比が設定したしきい値以
上のチャネルを選択する場合のアルゴリズムの一例を示
す。The radio controller 2 further receives a control signal (link channel establishment (re) request message) received from the communication terminal from the receiver 6, and measures the reception level.
The wireless control unit 2 sets the reception level of the control signal to D (Desire)
The D / U ratio is calculated with the interference level at the reception timing measured immediately before as the U (Undesire) wave level. Then, the information is sent to the main control unit 1, and at the time of channel selection, instead of comparing the interference wave level at the reception timing with the first level and the second level, a threshold value is set for the D / U ratio. By comparing the calculated D / U ratio with the threshold value, it is possible to prevent the communication quality on the receiving side from deteriorating. The above configuration is also added to the above algorithm. Hereinafter, an algorithm for selecting a channel whose interference wave level at the reception timing is equal to or lower than the first level or the second level and whose D / U ratio is equal to or higher than the set threshold value in ascending order of the transmission timing (Tx) interference wave level An example is shown below.
【００１４】1)各無線チャネル（周波数、スロット番
号）の送信タイミング（Ｔｘ）干渉波レベルと受信タイ
ミング（Ｒｘ）干渉波レベルをペアにして、Ｔｘレベル
の低い順にソートしてチャネルに優先順位付けを行う。
Ｔｘレベルが同一レベルの場合は、周波数、スロット番
号により順位をつける。 2)優先順位の高いチャネルより順に、Ｒｘ干渉波レベル
をチェックし、Ｒｘ干渉波レベルが第１レベル（２６ｄ
ＢμＶ）以下で、Ｄ／Ｕ比がしきい値以上の場合、その
チャネルを使用する。 3)上記2)の条件を満たさない場合、次の順位のチャネル
のＲｘ干渉波レベル、Ｄ／Ｕ比を同様の基準で判定す
る。 4)全チャネルが上記2)の条件を満たさない場合、再度優
先順位の高いチャネルより順に、Ｒｘ干渉波レベルが第
２レベル（４０ｄＢμＶ）以下でＤ／Ｕ比がしきい値以
上の場合、そのチャネルを使用する。 5)全チャネルが上記4)の条件を満たさない場合、再度優
先順位の高いチャネルより順に、Ｒｘ干渉波レベルが第
１レベル（２６ｄＢμＶ）以下でＤ／Ｕ比がしきい値未
満の場合、そのチャネルを使用する。 6)全チャネルが上記5)の条件を満たさない場合、再度優
先順位の高いチャネルより順に、Ｒｘ干渉波レベルが第
２レベル（４０ｄＢμＶ）以下でＤ／Ｕ比がしきい値未
満の場合、そのチャネルを使用する。1) The transmission timing (Tx) interference wave level and the reception timing (Rx) interference wave level of each wireless channel (frequency and slot number) are paired, and sorted in ascending order of Tx level to prioritize the channels. I do.
If the Tx levels are the same, the order is determined by frequency and slot number. 2) The Rx interference wave level is checked in order from the channel having the highest priority, and the Rx interference wave level is set to the first level (26d
If the D / U ratio is equal to or less than BμV) and the D / U ratio is equal to or more than the threshold, the channel is used. 3) If the above condition 2) is not satisfied, the Rx interference wave level and D / U ratio of the next-ranked channel are determined based on the same criteria. 4) When all the channels do not satisfy the above condition 2), if the Rx interference wave level is equal to or lower than the second level (40 dBμV) and the D / U ratio is equal to or higher than the threshold value, the channels are again set in order from the channel with the highest priority. Use channels. 5) When all the channels do not satisfy the above condition 4), if the Rx interference wave level is equal to or lower than the first level (26 dBμV) and the D / U ratio is less than the threshold value, the channels having the highest priority again are selected. Use channels. 6) If all the channels do not satisfy the above condition 5), if the Rx interference wave level is equal to or lower than the second level (40 dBμV) and the D / U ratio is less than the threshold value in the order of higher priority channel again, Use channels.
【００１５】以上の実施の形態は、常時空きスロットの
干渉波測定を行う例を示したが、常時空きスロットの干
渉波測定を行わない場合でも、以下の方法で使用予定ス
ロットの干渉波測定データを取得することができる。す
なわち、主制御部１は、移動通信端末から制御信号によ
って、通信チャネルを要求されてから直ちに、使用可能
なタイムスロットにおいて適当に周波数を数チャネル選
択し、数チャネル分の送受信タイミングの干渉波測定を
行うことを無線制御部２に通知する。無線制御部２は指
示された干渉波測定データを取得して主制御部１に通知
する。In the above-described embodiment, an example is shown in which the interference wave measurement of the vacant slot is always performed. However, even when the interference wave measurement of the vacant slot is not performed, the interference wave measurement data of the slot to be used can be obtained by the following method. Can be obtained. That is, the main control unit 1 selects several frequencies appropriately in an available time slot immediately after a communication channel is requested by a control signal from a mobile communication terminal, and measures interference waves of transmission / reception timing for several channels. Is notified to the wireless control unit 2. The wireless control unit 2 acquires the specified interference wave measurement data and notifies the main control unit 1 of the acquired data.
【００１６】[0016]
【発明の効果】以上、説明したように本発明によれば、
ＴＤＭＡ−ＴＤＤ方式で通信を行う無線基地局におい
て、例えば、送信出力５００ｍＷの大電力基地局と、送
信出力１０ｍＷの移動通信端末が通信を行う通信網のよ
うに、上り通信電力と下り通信電力の差が大きい通信シ
ステムでも、基地局側および移動通信端末側ともに干渉
波レベルが低く品質の良いチャネルを基地局が選択で
き、しかも、簡易な構成および簡易なアルゴリズムで実
現することができる。よって、従前に比較し通信チャネ
ル確立の成功率を向上させ、通信品質を改善することが
できるという効果がある。As described above, according to the present invention,
In a radio base station that performs communication according to the TDMA-TDD method, for example, as in a communication network in which a high-power base station with a transmission output of 500 mW and a mobile communication terminal with a transmission output of 10 mW perform communication, uplink communication power and downlink communication power are used. Even in a communication system having a large difference, the base station can select a channel having a low interference wave level and a high quality on both the base station side and the mobile communication terminal side, and can be realized with a simple configuration and a simple algorithm. Therefore, there is an effect that the success rate of establishing a communication channel can be improved and communication quality can be improved as compared with the related art.
【図１】本発明によるチャネル選択方法を用いた無線基
地局の無線送受信装置の実施の形態を示すブロック図で
ある。FIG. 1 is a block diagram showing an embodiment of a radio transmitting / receiving device of a radio base station using a channel selection method according to the present invention.
【図２Ａ】ＴＤＭＡ−ＴＤＤ通信における基地局と端末
との干渉状態を説明するための概略図である。FIG. 2A is a schematic diagram illustrating an interference state between a base station and a terminal in TDMA-TDD communication.
【図２Ｂ】図２Ａの基地局と端末との間の送受信タイミ
ングを説明するための図である。FIG. 2B is a diagram for explaining transmission / reception timing between the base station and the terminal in FIG. 2A.
１…主制御部 ２…無線制御部 ３…送信回路 ４…送信アンテナ選択スイッチ（ＳＷ1 ） ５…送受信切替スイッチ（ＳＷ2 ） ６ａ，６ｂ，６ｃ，６ｄ…アンテナ ７…受信回路1 ... main control unit 2 ... radio control unit 3 ... transmission circuit 4 ... transmit antenna selection switch (SW 1) 5 ... reception switching switch (SW 2) 6a, 6b, 6c, 6d ... antenna 7 ... reception circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 頭利 昌幸 東京都千代田区一番町８番地 第二電電株 式会社内 (72)発明者 阿尾 直樹 東京都港区虎ノ門３丁目５番１号 ディー ディーアイ東京ポケット電話株式会社内 Ｆターム(参考） 5K028 AA02 BB06 CC05 DD01 DD02 HH00 LL02 RR01 SS24 5K067 AA23 BB03 BB04 BB08 CC04 DD47 EE02 EE10 HH21 HH23 JJ11 KK03 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Inari 8th Ichibancho, Chiyoda-ku, Tokyo Second Denden Co., Ltd. (72) Inventor Naoki Ao 3-5-1 Toranomon, Minato-ku, Tokyo D F-term (reference) within DI Tokyo Pocket Telephone Co., Ltd. 5K028 AA02 BB06 CC05 DD01 DD02 HH00 LL02 RR01 SS24 5K067 AA23 BB03 BB04 BB08 CC04 DD47 EE02 EE10 HH21 HH23 JJ11 KK03
Claims (5)
通信システムにおけるチャネル選択方法において、基地
局の無線送受信装置は、移動通信端末から電波を受信す
る受信タイミングだけでなく送信タイミングでも干渉波
測定を行い、この干渉レベル情報を元に干渉の少ないチ
ャネルを選択することを特徴とする無線通信システムに
おけるダイナミックチャネル選択方法。In a channel selection method in a wireless communication system that performs communication according to a TDMA-TDD method, a wireless transmission / reception device of a base station measures an interference wave not only at a reception timing of receiving a radio wave from a mobile communication terminal but also at a transmission timing. A dynamic channel selection method in a wireless communication system, wherein a channel having less interference is selected based on the interference level information.
が使用中でないタイムスロットに対して常時行って最新
の送受信タイミングの干渉波レベル測定結果をメモリ部
に記憶しておき、新たに無線チャネルの使用が生じたと
き、前記メモリ部の最新の干渉波レベル情報を用いる
か、または通信端末から通信チャネルを要求されてから
使用可能なタイムスロットにおいて所定数の周波数のチ
ャネルを選択して送受信タイミングの干渉波レベルの測
定を行い、それを干渉波レベル情報として用いるように
した請求項１記載の無線通信システムにおけるダイナミ
ックチャネル選択方法。2. The interference wave measurement is always performed on a time slot that is not being used by the wireless transmission / reception device, and the interference wave level measurement result of the latest transmission / reception timing is stored in a memory unit, and a new wireless channel When the use of a communication channel occurs, the latest interference wave level information of the memory unit is used, or a channel of a predetermined number of frequencies is selected in an available time slot after a communication channel is requested from a communication terminal, and transmission / reception timing is selected. 2. The dynamic channel selection method in a wireless communication system according to claim 1, wherein the interference wave level is measured and used as the interference wave level information.
端末から受信した制御信号の受信レベルをＤ波レベルと
し、直前にキャリアセンスで取得した受信タイミングの
干渉波レベルをＵ波とし、送受信タイミングでの干渉波
レベルと、前記Ｄ波レベルおよびＵ波レベルの比を参照
してチャネルを選択することを特徴とする請求項１記載
の無線通信システムにおけるダイナミックチャネル選択
方法。3. In the channel selection, a reception level of a control signal received from a mobile communication terminal is set to a D-wave level, an interference wave level of a reception timing obtained immediately before by carrier sense is set to a U-wave, 2. The dynamic channel selection method in a wireless communication system according to claim 1, wherein a channel is selected with reference to an interference wave level and a ratio of the D wave level and the U wave level.
をそれぞれ送信側と受信側に切り替える送受切替手段
と、データおよび制御信号を送信する送信回路と、前記
送信回路の出力を前記送受切替手段の複数の送信端のい
ずれかを選択する送信アンテナ選択手段と、前記送受切
替手段の複数の受信端のそれぞれを入力とし、送受信タ
イミングでの受信ＲＳＳＩレベルを出力する受信回路
と、受信タイミングおよび送信タイミングでの干渉波測
定を行ってチャネルを選択する制御手段とから構成され
たことを特徴とする基地局の無線送受信装置。4. A transmission / reception switching means for switching the plurality of antennas between a transmission side and a reception side, a transmission circuit for transmitting data and a control signal, and an output of the transmission circuit for transmitting / receiving the data. Transmitting antenna selecting means for selecting any one of a plurality of transmitting ends, a receiving circuit for receiving each of the plurality of receiving ends of the transmitting / receiving switching means as input, and outputting a receiving RSSI level at transmitting / receiving timing, receiving timing and transmitting timing And a control means for selecting a channel by performing an interference wave measurement at the base station.
よび前記受信回路の入力にそれぞれ接続され、タイムス
ロットの使用／不使用により１バースト単位で切替え可
能な送受切替信号を前記送受切替手段に送出するととも
に前記受信回路からの送受信タイミングでの受信ＲＳＳ
Ｉレベルを受け、この受信ＲＳＳＩレベル，移動端末か
ら受信した制御信号を出力する無線制御部と、前記無線
制御部から得られた送受信タイミングの受信ＲＳＳＩレ
ベル，制御信号に基づき最も干渉波の少ないチャネルを
選択し、その選択結果を前記無線制御部に指示する主制
御部とから構成されたことを特徴とする請求項４記載の
基地局の無線送受信装置。5. The transmission / reception switching unit is connected to an output of the transmission circuit and an input of the reception circuit, and transmits a transmission / reception switching signal that can be switched in units of one burst by use / non-use of a time slot to the transmission / reception switching unit. Sending and receiving RSS at the transmission / reception timing from the receiving circuit
A radio controller for receiving the I level and outputting the received RSSI level and a control signal received from the mobile terminal; and a channel having the least interference wave based on the received RSSI level and the control signal at the transmission / reception timing obtained from the radio controller. The radio transmitting / receiving apparatus of a base station according to claim 4, further comprising: a main control unit that selects the radio communication unit and instructs the radio control unit on the selection result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24550098A JP3390784B2 (en) | 1998-08-31 | 1998-08-31 | Dynamic channel selection method in radio communication system and base station radio transmission / reception apparatus using the selection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24550098A JP3390784B2 (en) | 1998-08-31 | 1998-08-31 | Dynamic channel selection method in radio communication system and base station radio transmission / reception apparatus using the selection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000078644A true JP2000078644A (en) | 2000-03-14 |
| JP3390784B2 JP3390784B2 (en) | 2003-03-31 |
Family
ID=17134602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24550098A Expired - Lifetime JP3390784B2 (en) | 1998-08-31 | 1998-08-31 | Dynamic channel selection method in radio communication system and base station radio transmission / reception apparatus using the selection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3390784B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005083907A1 (en) * | 2004-02-26 | 2005-09-09 | Matsushita Electric Industrial Co., Ltd. | Mobile station device and transmission antenna selection method in the mobile station device |
| US7027830B2 (en) | 2001-11-21 | 2006-04-11 | Nec Corporation | Radio base station, mobile station, radio receiving apparatus, SIR estimation method, transmission power controlling method and program |
| JP2007201737A (en) * | 2006-01-25 | 2007-08-09 | Kyocera Corp | Base station device and method for controlling base station device |
| JP2009135656A (en) * | 2007-11-29 | 2009-06-18 | Kyocera Corp | Radio communication terminal and antenna selection method |
| US7764164B2 (en) | 2005-08-30 | 2010-07-27 | Fujitsu Limited | RFID interrogator and data communication method thereof |
-
1998
- 1998-08-31 JP JP24550098A patent/JP3390784B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7027830B2 (en) | 2001-11-21 | 2006-04-11 | Nec Corporation | Radio base station, mobile station, radio receiving apparatus, SIR estimation method, transmission power controlling method and program |
| WO2005083907A1 (en) * | 2004-02-26 | 2005-09-09 | Matsushita Electric Industrial Co., Ltd. | Mobile station device and transmission antenna selection method in the mobile station device |
| US7764164B2 (en) | 2005-08-30 | 2010-07-27 | Fujitsu Limited | RFID interrogator and data communication method thereof |
| JP2007201737A (en) * | 2006-01-25 | 2007-08-09 | Kyocera Corp | Base station device and method for controlling base station device |
| JP4599305B2 (en) * | 2006-01-25 | 2010-12-15 | 京セラ株式会社 | Base station apparatus and control method for base station apparatus |
| JP2009135656A (en) * | 2007-11-29 | 2009-06-18 | Kyocera Corp | Radio communication terminal and antenna selection method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3390784B2 (en) | 2003-03-31 |
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