JP5124306B2 - Radio base station control apparatus and radio base station control method - Google Patents

Radio base station control apparatus and radio base station control method Download PDF

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JP5124306B2
JP5124306B2 JP2008036720A JP2008036720A JP5124306B2 JP 5124306 B2 JP5124306 B2 JP 5124306B2 JP 2008036720 A JP2008036720 A JP 2008036720A JP 2008036720 A JP2008036720 A JP 2008036720A JP 5124306 B2 JP5124306 B2 JP 5124306B2
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武雄 大関
雅之 中野
隆 井上
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KDDI R&D Laboratories Inc
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Description

本発明は、伝送路マルチ化（ＭＩＭＯ：Multiple Input Multiple Output）技術を用いた無線通信システムにおける無線基地局制御装置および無線基地局制御方法に関する。   The present invention relates to a radio base station control apparatus and a radio base station control method in a radio communication system using a multiple input multiple output (MIMO) technique.

従来、ＭＩＭＯ技術が無線通信システムの周波数利用効率を向上させる技術の一つとして知られている。図３にＭＩＭＯ無線通信システムの基本概念図を示す。図３において、送信局は、複数の送信アンテナからそれぞれ別々のデータ信号を同一周波数で無線送信する。受信局は、その送信された無線信号を複数の受信アンテナで受信し復元する。その復元の際に、チャネル行列Ｈが理想的に分かっていれば、チャネル行列Ｈの逆行列を受信信号に乗算することで送信信号を分離することができ、図３の例のように４本の送信アンテナから別々のデータ信号を送信した場合には最大で４倍の速度でデータ通信を行うことが可能になる。これにより、周波数利用効率の向上が図られる。また、特許文献１に記載の従来のＭＩＭＯ無線通信システムは、複数の基地局と一つの無線端末の間でＭＩＭＯにより同時通信を行っている。
特開２００７−１３４８４４号公報 Conventionally, the MIMO technology is known as one of the technologies for improving the frequency utilization efficiency of a wireless communication system. FIG. 3 shows a basic conceptual diagram of a MIMO wireless communication system. In FIG. 3, a transmitting station wirelessly transmits different data signals from a plurality of transmitting antennas at the same frequency. The receiving station receives and restores the transmitted radio signal by a plurality of receiving antennas. At the time of restoration, if the channel matrix H is ideally known, the transmission signal can be separated by multiplying the reception signal by the inverse matrix of the channel matrix H. As shown in the example of FIG. When different data signals are transmitted from the transmission antennas, data communication can be performed at a maximum speed of four times. Thereby, the frequency utilization efficiency is improved. The conventional MIMO wireless communication system described in Patent Document 1 performs simultaneous communication by MIMO between a plurality of base stations and one wireless terminal.
JP 2007-134844 A

しかし、上述した特許文献１に記載の従来のＭＩＭＯ無線通信システムでは、無線端末において各基地局から送信された無線信号の受信電力に差がある場合、受信電力が小さい方の無線信号の受信特性が劣化し、高品質の通信を提供することが難しいという問題がある。   However, in the conventional MIMO wireless communication system described in Patent Document 1 described above, when there is a difference in the reception power of the radio signal transmitted from each base station in the wireless terminal, the reception characteristics of the radio signal with the smaller reception power Deteriorated and it is difficult to provide high-quality communication.

本発明は、このような事情を考慮してなされたもので、その目的は、複数の基地局と一つの無線端末の間でＭＩＭＯにより下り方向（基地局から無線端末への方向）の同時通信を行う際に、通信品質の向上を図るべく基地局を制御することのできる無線基地局制御装置および無線基地局制御方法を提供することにある。   The present invention has been made in view of such circumstances, and its object is to perform simultaneous communication in the downlink direction (direction from the base station to the radio terminal) by MIMO between a plurality of base stations and one radio terminal. It is an object of the present invention to provide a radio base station control device and a radio base station control method capable of controlling a base station in order to improve communication quality.

上記の課題を解決するために、本発明に係る無線基地局制御装置は、複数の基地局と一つの無線端末の間でＭＩＭＯにより下り方向の同時通信を行う無線通信システムにおける無線基地局制御装置において、無線端末における無線受信環境に基づいてＭＩＭＯ同時通信を行うか否かを判断する基地局間ＭＩＭＯ連携コントローラと、ＭＩＭＯ同時通信を行う場合に、ＭＩＭＯ同時通信対象の複数の基地局について、当該無線端末宛てに無線パケットを送信する際の送信スケジューリングを行う無線パケットスケジューラとを備えたことを特徴とする。   In order to solve the above problems, a radio base station control apparatus according to the present invention is a radio base station control apparatus in a radio communication system that performs simultaneous downlink communication by MIMO between a plurality of base stations and one radio terminal. The base station MIMO cooperation controller that determines whether or not to perform MIMO simultaneous communication based on the radio reception environment in the wireless terminal, and when performing MIMO simultaneous communication, And a wireless packet scheduler that performs transmission scheduling when transmitting a wireless packet to a wireless terminal.

本発明に係る無線基地局制御装置においては、無線端末に係る通信が要求するＱｏＳの情報を記憶する要求ＱｏＳ情報保持部を備え、前記無線パケットスケジューラは、無線端末に係る通信が要求するＱｏＳに応じて該通信を受け持つ送信基地局を決定することを特徴とする。   The radio base station control apparatus according to the present invention includes a request QoS information holding unit that stores QoS information required for communication related to a radio terminal, and the radio packet scheduler is configured to control QoS required for communication related to the radio terminal. In response, the transmission base station responsible for the communication is determined.

本発明に係る無線基地局制御装置においては、前記基地局間ＭＩＭＯ連携コントローラは、無線端末における無線受信環境においてＭＩＭＯ同時通信を行うことで通信品質の向上が期待できるものであるかを判定することを特徴とする。   In the radio base station controller according to the present invention, the inter-base station MIMO cooperation controller determines whether communication quality can be improved by performing MIMO simultaneous communication in a radio reception environment in a radio terminal. It is characterized by.

本発明に係る無線基地局制御装置においては、前記無線受信環境は、ＳＩＮＲ、ＣＩＮＲ、受信電力、無線レイヤにおける推定スループット又は無線端末の位置によって表されることを特徴とする。   In the radio base station control apparatus according to the present invention, the radio reception environment is represented by SINR, CINR, received power, estimated throughput in a radio layer, or position of a radio terminal.

本発明に係る無線基地局制御装置においては、前記判定条件として、ＳＩＮＲ、ＣＩＮＲ又は無線レイヤにおける推定スループットについての、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できる限界値を定めたことを特徴とする。   In the radio base station control apparatus according to the present invention, as the determination condition, a limit value that can be expected to improve communication quality by performing simultaneous MIMO communication on SINR, CINR, or estimated throughput in the radio layer is defined. Features.

本発明に係る無線基地局制御装置においては、前記判定条件として、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できる受信電力差の限界値を定めたことを特徴とする。   The radio base station control apparatus according to the present invention is characterized in that, as the determination condition, a limit value of a reception power difference that can be expected to improve communication quality by performing MIMO simultaneous communication is defined.

本発明に係る無線基地局制御装置においては、前記判定条件として、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できる端末基地局間距離差の限界値を定めたことを特徴とする。   The radio base station control apparatus according to the present invention is characterized in that, as the determination condition, a limit value of a distance difference between terminal base stations that can be expected to improve communication quality by performing simultaneous MIMO communication is defined.

本発明に係る無線基地局制御装置においては、前記無線受信環境を表す受信環境情報は、無線端末から送られることを特徴とする。   In the radio base station control apparatus according to the present invention, the reception environment information indicating the radio reception environment is transmitted from a radio terminal.

本発明に係る無線基地局制御装置においては、前記要求ＱｏＳのレベルは、ＩＰパケットの遅延時間、ジッター、ＩＰパケットが属するＩＰ通信のスループット又はパケット誤り率を含むことを特徴とする。   In the radio base station control apparatus according to the present invention, the requested QoS level includes an IP packet delay time, jitter, an IP communication throughput to which the IP packet belongs, or a packet error rate.

本発明に係る無線基地局制御方法は、複数の基地局と一つの無線端末の間でＭＩＭＯにより下り方向の同時通信を行う無線通信システムにおける無線基地局制御方法であって、無線端末における無線受信環境に基づいてＭＩＭＯ同時通信を行うか否かを判断する第１のステップと、ＭＩＭＯ同時通信を行う場合に、ＭＩＭＯ同時通信対象の複数の基地局について、当該無線端末宛てに無線パケットを送信する際の送信スケジューリングを行う第２のステップとを含むことを特徴とする。   A radio base station control method according to the present invention is a radio base station control method in a radio communication system that performs simultaneous downlink communication by MIMO between a plurality of base stations and one radio terminal, wherein radio reception at the radio terminal A first step for determining whether or not to perform MIMO simultaneous communication based on the environment, and when performing MIMO simultaneous communication, transmit a wireless packet to the wireless terminal for a plurality of base stations subject to simultaneous MIMO communication And a second step of performing transmission scheduling at that time.

本発明に係る無線基地局制御方法は、前記第２のステップにおいて、無線端末に係る通信が要求するＱｏＳに応じて該通信を受け持つ送信基地局を決定することを特徴とする。   The radio base station control method according to the present invention is characterized in that, in the second step, a transmission base station responsible for the communication is determined according to a QoS requested by the communication related to the radio terminal.

本発明によれば、複数の基地局と一つの無線端末の間でＭＩＭＯにより下り方向の同時通信を行う際に、通信品質の向上を図るべく基地局を制御することができるという効果が得られる。   Advantageous Effects of Invention According to the present invention, it is possible to control a base station in order to improve communication quality when simultaneous downlink communication is performed by MIMO between a plurality of base stations and one wireless terminal. .

以下、図面を参照し、本発明の実施形態について説明する。
図１は、本発明の一実施形態に係るＭＩＭＯ無線通信システムの構成を示す概念図である。図１において、無線基地局制御装置１は、バックボーンネットワーク（インターネットプロトコル（ＩＰ）網）に接続されている。複数の基地局２は、無線基地局制御装置１に通信回線で接続されている。無線端末３は基地局２との間で無線通信を行う。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram showing a configuration of a MIMO wireless communication system according to an embodiment of the present invention. In FIG. 1, a radio base station controller 1 is connected to a backbone network (Internet protocol (IP) network). The plurality of base stations 2 are connected to the radio base station control device 1 by communication lines. The wireless terminal 3 performs wireless communication with the base station 2.

以下の説明では、本発明に係る下り方向（基地局２から無線端末３への方向）の無線通信に係る構成について説明する。   In the following description, a configuration related to wireless communication in the downlink direction (direction from the base station 2 to the wireless terminal 3) according to the present invention will be described.

無線端末３は、一つ又は複数の基地局２との間で下り方向の無線通信を行う。複数の基地局２と一つの無線端末３の間では、複数の基地局２が連携したＭＩＭＯにより下り方向の同時通信（以下、「ＭＩＭＯ同時通信」と称する）を行う。無線基地局制御装置１は、通信品質の向上を図るべく各基地局２を制御する。   The wireless terminal 3 performs downlink wireless communication with one or a plurality of base stations 2. Between the plurality of base stations 2 and one wireless terminal 3, simultaneous downlink communication (hereinafter referred to as “MIMO simultaneous communication”) is performed by MIMO in which the plurality of base stations 2 cooperate. The radio base station control device 1 controls each base station 2 in order to improve communication quality.

図２は、本実施形態に係る無線基地局制御装置１の構成を示すブロック図である。図２において、無線基地局制御装置１は、基地局間ＭＩＭＯ連携コントローラ１１、無線パケットスケジューラ１２、要求ＱｏＳ情報保持部１３、ＩＰパケットキュー情報保持部１４、ＩＰパケットキュー１５及び無線パケット構築部１６を有する。無線パケット構築部１６は、基地局２の各々に対応して設けられる。   FIG. 2 is a block diagram showing a configuration of the radio base station control device 1 according to the present embodiment. In FIG. 2, the radio base station controller 1 includes an inter-base station MIMO cooperation controller 11, a radio packet scheduler 12, a request QoS information holding unit 13, an IP packet queue information holding unit 14, an IP packet queue 15, and a radio packet building unit 16. Have The radio packet construction unit 16 is provided corresponding to each of the base stations 2.

基地局間ＭＩＭＯ連携コントローラ１１は、ＭＩＭＯ同時通信を制御する。無線パケットスケジューラ１２は、基地局２が無線端末３宛てに無線パケットを送信する際の送信スケジューリングを行う。要求ＱｏＳ情報保持部１３は、無線端末３が行うＩＰ通信で要求されているＱｏＳ（Quality of Service）の情報を記憶する。その要求ＱｏＳのレベルとしては、例えば、ＩＰパケットの遅延時間、ジッター、ＩＰパケットが属するＩＰ通信のスループット、パケット誤り率などが挙げられる。   The inter-base station MIMO cooperation controller 11 controls the simultaneous MIMO communication. The wireless packet scheduler 12 performs transmission scheduling when the base station 2 transmits a wireless packet to the wireless terminal 3. The requested QoS information holding unit 13 stores QoS (Quality of Service) information requested by IP communication performed by the wireless terminal 3. Examples of the requested QoS level include IP packet delay time, jitter, IP communication throughput to which the IP packet belongs, packet error rate, and the like.

ＩＰパケットキュー情報保持部１４は、ＩＰパケットキュー１５に格納されているＩＰパケットの情報（パケットのアドレス情報（宛先アドレス、発信元アドレス）、パケットサイズ、パケット総数など）を記憶する。ＩＰパケットキュー１５は、無線端末３宛に送信されるＩＰパケットを格納する。無線パケット構築部１６は、無線端末３宛のＩＰパケットを無線パケットに変換する。該無線パケットは、該当の基地局２へ送られる。   The IP packet queue information holding unit 14 stores IP packet information (packet address information (destination address, source address), packet size, total number of packets, etc.) stored in the IP packet queue 15. The IP packet queue 15 stores IP packets transmitted to the wireless terminal 3. The wireless packet construction unit 16 converts the IP packet addressed to the wireless terminal 3 into a wireless packet. The radio packet is sent to the corresponding base station 2.

次に、基地局間ＭＩＭＯ連携コントローラ１１の動作を説明する。   Next, the operation of the inter-base station MIMO cooperation controller 11 will be described.

基地局間ＭＩＭＯ連携コントローラ１１は、無線端末３における無線受信環境を表す受信環境情報に基づいて、ＭＩＭＯ同時通信を制御する。受信環境情報は、基地局２ごとの情報を含む。無線端末３は、各基地局２についての自己の無線受信環境を表す受信環境情報を基地局２（図２の例では基地局＃１）へ送る。基地局２は、無線端末３から受け取った受信環境情報を無線基地局制御装置１へ送る。受信環境情報としては、例えば、ＳＩＮＲ（Signal to Interference and Noise power Ratio）、ＣＩＮＲ（Carrier to Interference and Noise power Ratio）、受信電力、無線レイヤにおける推定スループット、無線端末３の位置などの情報が挙げられる。   The inter-base station MIMO cooperation controller 11 controls the simultaneous MIMO communication based on the reception environment information indicating the wireless reception environment in the wireless terminal 3. The reception environment information includes information for each base station 2. The wireless terminal 3 sends reception environment information indicating its own wireless reception environment for each base station 2 to the base station 2 (base station # 1 in the example of FIG. 2). The base station 2 sends the reception environment information received from the wireless terminal 3 to the wireless base station control device 1. Examples of the reception environment information include information such as SINR (Signal to Interference and Noise Power Ratio), CINR (Carrier to Interference and Noise Power Ratio), reception power, estimated throughput in the radio layer, and position of the radio terminal 3. .

基地局間ＭＩＭＯ連携コントローラ１１は、受信環境情報に基づいて、ＭＩＭＯ同時通信を行うか否かを判断する。その際、受信環境情報に基づいてＭＩＭＯ同時通信を行うか否かを判定するための判定条件を事前に定めておく。その判定条件の設定基準は、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できることである。従って、受信環境情報が判定条件を満足する場合は、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できると判断する。以下に、受信環境情報に基づいてＭＩＭＯ同時通信を行うか否かを判断する方法について、いくつかの実施例を挙げて説明する。   The inter-base station MIMO cooperation controller 11 determines whether or not to perform MIMO simultaneous communication based on the reception environment information. At that time, determination conditions for determining whether or not to perform MIMO simultaneous communication based on the reception environment information are determined in advance. The criterion for setting the determination condition is that communication quality can be improved by performing MIMO simultaneous communication. Therefore, when the reception environment information satisfies the determination condition, it is determined that communication quality can be improved by performing simultaneous MIMO communication. Hereinafter, a method for determining whether or not to perform MIMO simultaneous communication based on reception environment information will be described with reference to some embodiments.

実施例１では、受信環境情報として、ＳＩＮＲ、ＣＩＮＲ又は無線レイヤにおける推定スループットの情報を利用する。判定条件には、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できる限界値を用いる。例えば、受信環境情報としてＳＩＮＲの情報を用いる場合、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できるＳＩＮＲの限界値を定め、該限界値を判定用の閾値とする。この場合、受信環境情報で表されるＳＩＮＲが閾値以上である場合、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できると判断する。   In the first embodiment, SINR, CINR, or estimated throughput information in the radio layer is used as reception environment information. As the determination condition, a limit value that can be expected to improve communication quality by performing MIMO simultaneous communication is used. For example, when SINR information is used as reception environment information, a limit value of SINR that can be expected to improve communication quality by performing MIMO simultaneous communication is determined, and the limit value is set as a threshold value for determination. In this case, when the SINR represented by the reception environment information is equal to or greater than the threshold, it is determined that communication quality can be improved by performing MIMO simultaneous communication.

基地局間ＭＩＭＯ連携コントローラ１１は、受信環境情報に含まれる各基地局２の情報と判定条件を比較し、複数の基地局２の情報が判定条件を満足する場合に、ＭＩＭＯ同時通信を行うと決定する。そして、最もよく判定条件を満足する方から２以上所定数の基地局２を、当該無線端末３とＭＩＭＯ同時通信する基地局に選択する。   The inter-base station MIMO cooperation controller 11 compares the determination conditions with the information of each base station 2 included in the reception environment information, and performs simultaneous MIMO communication when the information of the plurality of base stations 2 satisfies the determination conditions. decide. Then, two or more predetermined number of base stations 2 are selected as the base station that performs MIMO simultaneous communication with the wireless terminal 3 from the one that best satisfies the determination condition.

一方、基地局間ＭＩＭＯ連携コントローラ１１は、判定条件を満足する基地局２の台数が１以下である場合には、当該無線端末３とＭＩＭＯ同時通信することができないと判断する。   On the other hand, when the number of base stations 2 satisfying the determination condition is 1 or less, the inter-base station MIMO cooperation controller 11 determines that simultaneous MIMO communication with the wireless terminal 3 is not possible.

実施例２では、受信環境情報として受信電力の情報を利用する。判定条件には、各基地局２からの受信電力の差を用いる。その判定条件として、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できる受信電力差の限界値を定め、該限界値を判定用の閾値とする。   In the second embodiment, reception power information is used as reception environment information. As a determination condition, a difference in received power from each base station 2 is used. As a determination condition, a limit value of a received power difference that can be expected to improve communication quality by performing MIMO simultaneous communication is determined, and the limit value is set as a determination threshold value.

基地局間ＭＩＭＯ連携コントローラ１１は、受信環境情報に含まれる各基地局２の受信電力情報から各受信電力の差を計算し、この計算結果の受信電力差をそれぞれ閾値と比較する。基地局間ＭＩＭＯ連携コントローラ１１は、閾値以下の受信電力差が存在する場合に、ＭＩＭＯ同時通信を行うと決定する。そして、その閾値条件を満足する受信電力差に対応する基地局２のグループの中で、受信電力差が最も小さい方から２以上所定数の基地局２を、当該無線端末３とＭＩＭＯ同時通信する基地局に選択する。   The inter-base station MIMO cooperation controller 11 calculates a difference between the received powers from the received power information of each base station 2 included in the received environment information, and compares the received power difference of the calculation result with a threshold value. The inter-base station MIMO cooperation controller 11 determines to perform the simultaneous MIMO communication when there is a received power difference equal to or less than the threshold. Then, among the groups of base stations 2 corresponding to the received power difference that satisfies the threshold condition, two or more base stations 2 having the smallest received power difference are simultaneously communicated with the wireless terminal 3 by MIMO. Select to base station.

一方、基地局間ＭＩＭＯ連携コントローラ１１は、閾値以下の受信電力差が存在しない場合には、当該無線端末３とＭＩＭＯ同時通信することができないと判断する。   On the other hand, the inter-base station MIMO cooperation controller 11 determines that MIMO simultaneous communication with the wireless terminal 3 cannot be performed when there is no difference in received power equal to or less than the threshold.

実施例３では、受信環境情報として無線端末３の位置の情報を利用する。判定条件には、無線端末３と各基地局２との間の距離（端末基地局間距離）についての差を用いる。その判定条件として、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できる端末基地局間距離差の限界値を定め、該限界値を判定用の閾値とする。   In the third embodiment, information on the position of the wireless terminal 3 is used as reception environment information. As the determination condition, a difference in distance between the wireless terminal 3 and each base station 2 (distance between terminal base stations) is used. As a determination condition, a limit value of a distance difference between terminal base stations that can be expected to improve communication quality by performing MIMO simultaneous communication is determined, and the limit value is set as a determination threshold value.

基地局間ＭＩＭＯ連携コントローラ１１は、受信環境情報に含まれる無線端末３の位置情報から、当該無線端末３と各基地局２について端末基地局間距離を計算する。基地局２の位置情報は事前に設定しておく。基地局間ＭＩＭＯ連携コントローラ１１は、各端末基地局間距離の差を計算し、この計算結果の端末基地局間距離差をそれぞれ閾値と比較する。基地局間ＭＩＭＯ連携コントローラ１１は、閾値以下の端末基地局間距離差が存在する場合に、ＭＩＭＯ同時通信を行うと決定する。そして、その閾値条件を満足する端末基地局間距離差に対応する基地局２のグループの中で、端末基地局間距離差が最も小さい方から２以上所定数の基地局２を、当該無線端末３とＭＩＭＯ同時通信する基地局に選択する。   The inter-base station MIMO cooperation controller 11 calculates the distance between the terminal base stations for the wireless terminal 3 and each base station 2 from the position information of the wireless terminal 3 included in the reception environment information. The position information of the base station 2 is set in advance. The inter-base station MIMO cooperation controller 11 calculates the difference between the distances between the terminal base stations, and compares the calculated distance difference between the terminal base stations with a threshold value. The inter-base station MIMO cooperation controller 11 determines to perform MIMO simultaneous communication when there is a distance difference between terminal base stations equal to or less than the threshold. Then, in the group of base stations 2 corresponding to the distance difference between the terminal base stations that satisfies the threshold condition, two or more predetermined numbers of base stations 2 from the one with the smallest distance difference between the terminal base stations are assigned to the wireless terminal 3 is selected as a base station that performs MIMO simultaneous communication.

一方、基地局間ＭＩＭＯ連携コントローラ１１は、閾値以下の端末基地局間距離差が存在しない場合には、当該無線端末３とＭＩＭＯ同時通信することができないと判断する。   On the other hand, the inter-base station MIMO cooperation controller 11 determines that MIMO simultaneous communication with the wireless terminal 3 is not possible when there is no distance difference between the terminal base stations equal to or less than the threshold.

なお、実施例３の変形例として、事前に、無線端末３が存在しうる位置に対応する端末基地局間距離差を計算し、この計算結果に基づいた基地局選定データベースを作成しておいてもよい。基地局選定データベースは、無線端末３の位置情報に関連付けて、当該無線端末３とＭＩＭＯ同時通信を行うことが可能な２以上所定数の基地局２の情報を格納する。この場合、基地局間ＭＩＭＯ連携コントローラ１１は、受信環境情報に含まれる無線端末３の位置情報に基づいて基地局選定データベースを検索し、検索結果として当該無線端末３とＭＩＭＯ同時通信を行う２以上所定数の基地局２の情報を取得する。もし、基地局選定データベースの検索結果なしの場合には、当該無線端末３とＭＩＭＯ同時通信を行うことができないと判断する。   As a modification of the third embodiment, a terminal base station distance difference corresponding to a position where the wireless terminal 3 can exist is calculated in advance, and a base station selection database is created based on the calculation result. Also good. The base station selection database stores information of two or more predetermined numbers of base stations 2 capable of performing MIMO simultaneous communication with the wireless terminal 3 in association with the position information of the wireless terminal 3. In this case, the inter-base station MIMO cooperation controller 11 searches the base station selection database based on the position information of the wireless terminal 3 included in the reception environment information, and performs two or more simultaneous MIMO communications with the wireless terminal 3 as a search result. Information on a predetermined number of base stations 2 is acquired. If there is no search result of the base station selection database, it is determined that MIMO simultaneous communication with the wireless terminal 3 cannot be performed.

以上が受信環境情報に基づいてＭＩＭＯ同時通信を行うか否かを判断する方法についての実施例である。   The above is the embodiment of the method for determining whether or not to perform the MIMO simultaneous communication based on the reception environment information.

基地局間ＭＩＭＯ連携コントローラ１１は、無線端末３とＭＩＭＯ同時通信する２以上所定数の基地局２を、無線パケットスケジューラ１２へ指示する。   The inter-base station MIMO cooperation controller 11 instructs the radio packet scheduler 12 on two or more predetermined numbers of base stations 2 that perform MIMO simultaneous communication with the radio terminal 3.

一方、基地局間ＭＩＭＯ連携コントローラ１１は、無線端末３とＭＩＭＯ同時通信を行うことができないと判断した場合には、無線端末３と一対一で無線通信する基地局２を無線パケットスケジューラ１２へ指示する。基地局間ＭＩＭＯ連携コントローラ１１は、無線端末３と一対一で無線通信する基地局２として、当該無線端末３における無線受信環境が最良となる基地局２を受信環境情報に基づいて選択する。例えば、ＳＩＮＲ、ＣＩＮＲ、受信電力、無線レイヤにおける推定スループット、無線端末３の位置のいずれか又は複数の情報に基づいて、無線端末３における最良の無線受信環境となる基地局２を判断する。   On the other hand, if the inter-base station MIMO cooperation controller 11 determines that the MIMO simultaneous communication with the radio terminal 3 cannot be performed, the base station 2 that performs radio communication with the radio terminal 3 on a one-to-one basis is instructed to the radio packet scheduler 12. To do. Based on the reception environment information, the inter-base station MIMO cooperation controller 11 selects the base station 2 with the best wireless reception environment in the wireless terminal 3 as the base station 2 that performs wireless communication with the wireless terminal 3 on a one-to-one basis. For example, the base station 2 that is the best wireless reception environment in the wireless terminal 3 is determined based on one or more information of SINR, CINR, received power, estimated throughput in the wireless layer, and position of the wireless terminal 3.

次に、無線パケットスケジューラ１２の動作を説明する。   Next, the operation of the wireless packet scheduler 12 will be described.

無線パケットスケジューラ１２は、基地局間ＭＩＭＯ連携コントローラ１１から無線端末３とＭＩＭＯ同時通信する旨の指示を受けた場合、その指示によるＭＩＭＯ同時通信対象の２以上所定数の基地局２について、当該無線端末３宛てに無線パケットを送信する際の送信スケジューリングを行う。この送信スケジューリングでは、まずＩＰパケットキュー情報保持部１４から当該無線端末３宛てＩＰパケットのアドレス情報を取得する。次いで、その取得したアドレス情報によって特定されるＩＰ通信で要求されているＱｏＳの情報を、要求ＱｏＳ情報保持部１３から取得する。次いで、その取得した要求ＱｏＳ情報によって示される要求ＱｏＳに応じて、当該ＩＰ通信に属するＩＰパケットを振り分ける基地局２を決定する。要求ＱｏＳのレベルが高いＩＰ通信に属するＩＰパケットは、無線受信環境の良い方の基地局２へスケジューリングする。要求ＱｏＳのレベルが低いＩＰ通信に属するＩＰパケットは、無線受信環境の良くない方の基地局２へスケジューリングする。ＭＩＭＯ同時通信対象の各基地局２についての無線端末３における無線受信環境の順位付けは、受信環境情報に基づいて行う。   When the wireless packet scheduler 12 receives an instruction to perform MIMO simultaneous communication with the wireless terminal 3 from the inter-base station MIMO cooperation controller 11, the wireless packet scheduler 12 transmits the wireless packet scheduler 12 for the predetermined number of base stations 2 to be subjected to simultaneous MIMO communication according to the instruction. Transmission scheduling is performed when a wireless packet is transmitted to the terminal 3. In this transmission scheduling, first, IP packet address information addressed to the wireless terminal 3 is acquired from the IP packet queue information holding unit 14. Next, the QoS information requested by the IP communication specified by the acquired address information is acquired from the requested QoS information holding unit 13. Next, the base station 2 that distributes the IP packet belonging to the IP communication is determined in accordance with the request QoS indicated by the acquired request QoS information. An IP packet belonging to an IP communication having a high requested QoS level is scheduled to the base station 2 having a better radio reception environment. An IP packet belonging to an IP communication having a low requested QoS level is scheduled to the base station 2 having a poor radio reception environment. The ranking of the radio reception environment in the radio terminal 3 for each base station 2 subject to simultaneous MIMO communication is performed based on the reception environment information.

一方、無線パケットスケジューラ１２は、基地局間ＭＩＭＯ連携コントローラ１１から無線端末３と一対一で無線通信する旨の指示を受けた場合、その指示による一対一無線通信対象の一基地局２について、当該無線端末３宛てに無線パケットを送信する際の送信スケジューリングを行う。この送信スケジューリングにおいても、当該無線端末３に係るＩＰ通信で要求されているＱｏＳを考慮することが好ましい。   On the other hand, when the wireless packet scheduler 12 receives an instruction to perform one-to-one wireless communication with the wireless terminal 3 from the inter-base station MIMO cooperation controller 11, the wireless packet scheduler 12 Transmission scheduling is performed when a wireless packet is transmitted to the wireless terminal 3. Also in this transmission scheduling, it is preferable to consider the QoS required in the IP communication related to the wireless terminal 3.

無線パケットスケジューラ１２は、送信スケジューリング結果に従って、ＩＰパケットキュー１５からＩＰパケットを送信基地局２に対応の無線パケット構築部１６へ出力させる。   The radio packet scheduler 12 causes the IP packet queue 15 to output an IP packet to the radio packet construction unit 16 corresponding to the transmission base station 2 according to the transmission scheduling result.

無線パケット構築部１６は、ＩＰパケットキュー１５から出力されたＩＰパケットを受信し、該ＩＰパケットを無線パケットに変換して基地局２へ送信する。   The wireless packet construction unit 16 receives the IP packet output from the IP packet queue 15, converts the IP packet into a wireless packet, and transmits the wireless packet to the base station 2.

上述した実施形態によれば、無線端末における無線受信環境に基づいてＭＩＭＯ同時通信を行うか否かを判断するので、ＭＩＭＯ同時通信によって通信品質の向上が期待できる場合にのみＭＩＭＯ同時通信を行うように、基地局を制御することができる。これにより、通信品質の向上に寄与することができる。   According to the above-described embodiment, since it is determined whether or not simultaneous MIMO communication is performed based on the wireless reception environment in the wireless terminal, simultaneous MIMO communication is performed only when improvement in communication quality can be expected by simultaneous MIMO communication. In addition, the base station can be controlled. Thereby, it can contribute to the improvement of communication quality.

また、無線端末に係るＩＰ通信が要求するＱｏＳに応じて該ＩＰ通信に属するＩＰパケットの送信基地局を決定するので、該要求ＱｏＳに適切な送信基地局を用いたＭＩＭＯ同時通信を行うことができる。例えば、例えば、要求ＱｏＳレベルの高い制御系の通信パケットは無線受信環境の良い方の基地局から送信させる一方、要求ＱｏＳレベルの低い通常のデータ系の通信パケットは無線受信環境の良くない方の基地局から送信させることができる。これにより、無線リソースの効率的な割当てやＱｏＳ保証に寄与することが可能となる。   In addition, since the transmission base station of the IP packet belonging to the IP communication is determined according to the QoS requested by the IP communication related to the wireless terminal, it is possible to perform the MIMO simultaneous communication using the transmission base station suitable for the requested QoS. it can. For example, for example, a control system communication packet having a high required QoS level is transmitted from a base station having a better radio reception environment, while a normal data system communication packet having a lower request QoS level is transmitted from a base station having a poor radio reception environment. It can be transmitted from the base station. As a result, it is possible to contribute to efficient allocation of radio resources and QoS guarantee.

以上、本発明の実施形態について図面を参照して詳述してきたが、具体的な構成はこの実施形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計変更等も含まれる。   As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

本発明の一実施形態に係るＭＩＭＯ無線通信システムの構成を示す概念図である。It is a conceptual diagram which shows the structure of the MIMO radio | wireless communications system which concerns on one Embodiment of this invention. 同実施形態に係る無線基地局制御装置１の構成を示すブロック図である。It is a block diagram which shows the structure of the radio base station control apparatus 1 which concerns on the same embodiment. ＭＩＭＯ無線通信システムの基本概念図である。1 is a basic conceptual diagram of a MIMO wireless communication system.

符号の説明Explanation of symbols

１…無線基地局制御装置、２…基地局、３…無線端末、１１…基地局間ＭＩＭＯ連携コントローラ、１２…無線パケットスケジューラ、１３…要求ＱｏＳ情報保持部、１４…ＩＰパケットキュー情報保持部、１５…ＩＰパケットキュー、１６…無線パケット構築部 DESCRIPTION OF SYMBOLS 1 ... Wireless base station control apparatus, 2 ... Base station, 3 ... Wireless terminal, 11 ... Inter-base station MIMO cooperation controller, 12 ... Wireless packet scheduler, 13 ... Request QoS information holding part, 14 ... IP packet queue information holding part, 15 ... IP packet queue, 16 ... wireless packet building unit

Claims (4)

複数の基地局と一つの無線端末の間でＭＩＭＯにより下り方向の同時通信を行う無線通信システムにおける無線基地局制御装置において、
無線端末における無線受信環境に基づいてＭＩＭＯ同時通信を行うか否かを判断する基地局間ＭＩＭＯ連携コントローラと、
ＭＩＭＯ同時通信を行う場合に、ＭＩＭＯ同時通信対象の複数の基地局について、当該無線端末宛てに無線パケットを送信する際の送信スケジューリングを行う無線パケットスケジューラと、を備え、
前記基地局間ＭＩＭＯ連携コントローラは、無線端末における無線受信環境においてＭＩＭＯ同時通信を行うことで通信品質の向上が期待できるものであるかを判定し、
前記無線受信環境は無線端末の位置によって表され、
前記判定条件として、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できる端末基地局間距離差の限界値を定めた、
ことを特徴とする無線基地局制御装置。 In a radio base station controller in a radio communication system that performs simultaneous downlink communication by MIMO between a plurality of base stations and one radio terminal,
An inter-base station MIMO cooperation controller that determines whether to perform MIMO simultaneous communication based on a radio reception environment in a radio terminal;
A wireless packet scheduler that performs transmission scheduling when transmitting wireless packets to the wireless terminal for a plurality of base stations targeted for simultaneous MIMO communication when performing MIMO simultaneous communication;
The inter-base station MIMO cooperation controller determines whether communication quality can be improved by performing MIMO simultaneous communication in a wireless reception environment in a wireless terminal,
The wireless reception environment is represented by the position of the wireless terminal,
As the determination condition, a limit value of a distance difference between terminal base stations that can be expected to improve communication quality by performing MIMO simultaneous communication is determined.
A radio base station control device. 複数の基地局と一つの無線端末の間でＭＩＭＯにより下り方向の同時通信を行う無線通信システムにおける無線基地局制御装置において、
無線端末における無線受信環境に基づいてＭＩＭＯ同時通信を行うか否かを判断する基地局間ＭＩＭＯ連携コントローラと、
ＭＩＭＯ同時通信を行う場合に、ＭＩＭＯ同時通信対象の複数の基地局について、当該無線端末宛てに無線パケットを送信する際の送信スケジューリングを行う無線パケットスケジューラと、を備え、
前記基地局間ＭＩＭＯ連携コントローラは、無線端末における無線受信環境においてＭＩＭＯ同時通信を行うことで通信品質の向上が期待できるものであるかを判定し、
前記無線受信環境は前記基地局からの受信電力によって表され、
前記判定条件として、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できる前記基地局間の受信電力差の限界値を定めた、
ことを特徴とする無線基地局制御装置。 In a radio base station controller in a radio communication system that performs simultaneous downlink communication by MIMO between a plurality of base stations and one radio terminal,
An inter-base station MIMO cooperation controller that determines whether to perform MIMO simultaneous communication based on a radio reception environment in a radio terminal;
A wireless packet scheduler that performs transmission scheduling when transmitting wireless packets to the wireless terminal for a plurality of base stations targeted for simultaneous MIMO communication when performing MIMO simultaneous communication;
The inter-base station MIMO cooperation controller determines whether communication quality can be improved by performing MIMO simultaneous communication in a wireless reception environment in a wireless terminal,
The wireless reception environment is represented by received power from the base station,
As the determination condition, the limit value of the received power difference between the base stations that can be expected to improve communication quality by performing MIMO simultaneous communication,
A radio base station control device. 複数の基地局と一つの無線端末の間でＭＩＭＯにより下り方向の同時通信を行う無線通信システムにおける無線基地局制御方法であって、
無線端末における無線受信環境に基づいてＭＩＭＯ同時通信を行うか否かを判断する第１のステップと、
ＭＩＭＯ同時通信を行う場合に、ＭＩＭＯ同時通信対象の複数の基地局について、当該無線端末宛てに無線パケットを送信する際の送信スケジューリングを行う第２のステップと、を含み、
前記第１のステップは、無線端末における無線受信環境においてＭＩＭＯ同時通信を行うことで通信品質の向上が期待できるものであるかを判定し、
前記無線受信環境は無線端末の位置によって表され、
前記判定条件として、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できる端末基地局間距離差の限界値を定めた、
ことを特徴とする無線基地局制御方法。 A radio base station control method in a radio communication system that performs simultaneous downlink communication by MIMO between a plurality of base stations and one radio terminal,
A first step of determining whether to perform MIMO simultaneous communication based on a wireless reception environment in a wireless terminal;
A second step of performing transmission scheduling when transmitting wireless packets to the wireless terminal for a plurality of base stations targeted for simultaneous MIMO communication when performing MIMO simultaneous communication; and
The first step determines whether communication quality can be improved by performing MIMO simultaneous communication in a wireless reception environment in a wireless terminal;
The wireless reception environment is represented by the position of the wireless terminal,
As the determination condition, a limit value of a distance difference between terminal base stations that can be expected to improve communication quality by performing MIMO simultaneous communication is determined.
And a radio base station control method. 複数の基地局と一つの無線端末の間でＭＩＭＯにより下り方向の同時通信を行う無線通信システムにおける無線基地局制御方法であって、
無線端末における無線受信環境に基づいてＭＩＭＯ同時通信を行うか否かを判断する第１のステップと、
ＭＩＭＯ同時通信を行う場合に、ＭＩＭＯ同時通信対象の複数の基地局について、当該無線端末宛てに無線パケットを送信する際の送信スケジューリングを行う第２のステップと、を含み、
前記第１のステップは、無線端末における無線受信環境においてＭＩＭＯ同時通信を行うことで通信品質の向上が期待できるものであるかを判定し、
前記無線受信環境は前記基地局からの受信電力によって表され、
前記判定条件として、ＭＩＭＯ同時通信を行うことで通信品質の向上が期待できる前記基地局間の受信電力差の限界値を定めた、
ことを特徴とする無線基地局制御方法。 A radio base station control method in a radio communication system that performs simultaneous downlink communication by MIMO between a plurality of base stations and one radio terminal,
A first step of determining whether to perform MIMO simultaneous communication based on a wireless reception environment in a wireless terminal;
A second step of performing transmission scheduling when transmitting wireless packets to the wireless terminal for a plurality of base stations targeted for simultaneous MIMO communication when performing MIMO simultaneous communication; and
The first step determines whether communication quality can be improved by performing MIMO simultaneous communication in a wireless reception environment in a wireless terminal;
The wireless reception environment is represented by received power from the base station,
As the determination condition, the limit value of the received power difference between the base stations that can be expected to improve communication quality by performing MIMO simultaneous communication,
And a radio base station control method.
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