TWI517621B - Mobile communication system, base station, mobile station and radio communication method - Google Patents
Mobile communication system, base station, mobile station and radio communication method Download PDFInfo
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Description
本案係有關於行動通訊系統、基地台、行動台及無線通訊方法。This case is about mobile communication systems, base stations, mobile stations and wireless communication methods.
目前,大多利用行動電話或無線MAN(Metropolitan Area Network)等行動通訊系統。又,為謀求無線通訊之更高速化、大容量化,關於次世代之行動通訊技術,持續進行活躍之議論。At present, most mobile communication systems such as mobile phones or wireless MAN (Metropolitan Area Network) are used. In addition, in order to increase the speed and capacity of wireless communication, the next generation of mobile communication technologies continues to be actively discussed.
舉例言之,在標準化組織之一之3GPP(3rd Generation Partnership Project),提出可進行最大使用20MHz之頻帶之通訊之稱為LTE(Long Term Evolution)的通訊規格。進一步,LTE之次世代之通訊規格提出可進行最大使用100MHz之頻帶之通訊之稱為LTE-A(Long Term Evolution-Advanced)的通訊規格。For example, in the 3GPP (3rd Generation Partnership Project), one of the standardization organizations, a communication standard called LTE (Long Term Evolution) which can perform communication using a band of up to 20 MHz is proposed. Further, the communication specification of the next generation of LTE proposes a communication standard called LTE-A (Long Term Evolution-Advanced) which can perform communication using a band of up to 100 MHz.
又,在LTE或LTE-A,檢討稱為MBSFN(Multimedia Broadcast multicast service Single Frequency Network)之資料發送方法的採用。在MBSFN,複數個基地台在同一時序使用同一頻率及同一調變方式,發送同一內容之資料。以MBSFN發送之資料稱為MBMS(Multimedia Broadcast Multicast Service)資料。行動台藉合成複數個基地台之無線信號,可使接收品質提高。Further, in LTE or LTE-A, the use of a data transmission method called MBSFN (Multimedia Broadcast multicast service Single Frequency Network) is reviewed. In MBSFN, a plurality of base stations transmit the same content using the same frequency and the same modulation method at the same timing. The data transmitted by MBSFN is called MBMS (Multimedia Broadcast Multicast Service) data. The mobile station can improve the reception quality by synthesizing the wireless signals of a plurality of base stations.
關於MBSFN,提出行動終端機在MBSFN區域接收用於接收播放型資料之同步資訊,以搜尋構成MBSFN區域之細胞之技術(例如參照專利文獻1)。還提出了行動終端機測量各基地台之接收品質,不僅是進行該行動終端機之排程之服務基地台,按所測量之品質選擇之其他基地台也可發送播放型資料之技術(例如參照專利文獻2)。此外,為減低行動終端機要測量之細胞之數,亦提出了抑制作為系統資訊而通報之相鄰細胞之數的技術(參照專利文獻3)。With regard to the MBSFN, it is proposed that the mobile terminal receives the synchronization information for receiving the broadcast type data in the MBSFN area to search for the cells constituting the MBSFN area (for example, refer to Patent Document 1). It is also proposed that the mobile terminal measures the reception quality of each base station, not only the service base station that performs the scheduling of the mobile terminal, but also the technology that other base stations selected according to the measured quality can also transmit the broadcast data (for example, reference) Patent Document 2). Further, in order to reduce the number of cells to be measured by the mobile terminal, a technique for suppressing the number of adjacent cells notified as system information has also been proposed (see Patent Document 3).
專利文獻1:日本專利公開公報2009-188612號Patent Document 1: Japanese Patent Laid-Open Publication No. 2009-188612
專利文獻2:國際公開公報第2008/038336號Patent Document 2: International Publication No. 2008/038336
專利文獻3:國際公開公報第2007/148911號Patent Document 3: International Publication No. 2007/148911
然而,當存在於某區域內之所有基地台皆要在同一時序進行發送同一內容之資料之處理時,有無線資源之利用效率降低之虞。因此,考慮將在存在於該區域內之基地台中進行上述發送處理之基地台限定在一部份。However, when all the base stations existing in a certain area are to process the data of the same content at the same timing, the utilization efficiency of the radio resources is lowered. Therefore, it is considered to limit the base station that performs the above-described transmission processing in the base station existing in the area to a part.
然而,在進行上述發送處理之基地台及不進行之基地台混合存在之行動通訊系統中,要如何控制進行以該發送處理發送之資料的接收之行動台則成為問題。即,在如專利文獻2記載之技術般之單對行動台而言接收品質佳之基地台及行動台進行通訊的控制方法中,有無法平穩地控制行動台之接收處理之虞。However, in a mobile communication system in which a base station that performs the above-described transmission processing and a base station that does not perform a hybrid station, how to control the mobile station that performs reception of the data transmitted by the transmission processing becomes a problem. In other words, in the control method in which the base station and the mobile station that perform the reception are excellent in the single-pair mobile station as in the technique described in Patent Document 2, there is a possibility that the reception processing of the mobile station cannot be smoothly controlled.
本案即是鑑於此點而發明者,其目的係提供可平穩地控制用以接收複數個基地台在同一時序發送之同一內容之資料的行動台之接收處理之行動通訊系統、基地台、行動台及無線通訊方法。The present invention has been made in view of the above, and an object thereof is to provide a mobile communication system, a base station, and a mobile station capable of smoothly controlling reception processing of a mobile station for receiving data of the same content transmitted by a plurality of base stations at the same timing. And wireless communication methods.
為解決上述課題,提供一種包含有複數個基地台,且複數個基地台中2個以上之基地台在同一時序發送同一內容之資料的行動通訊系統。此行動通訊系統包含有具有通知部及控制部之基地台、及具有發送部及接收部之行動台。通知部將複數個基地台中在進行同一內容之資料之發送的2個以上之其他基地台通知行動台。控制部按顯示來自2個以上其他基地台之無線信號在行動台之接收狀況的資訊,對行動台指示從2個以上之其他基地台進行同一內容之資料之接收。發送部將顯示來自從基地台所通知之2個以上其他基地台之無線信號的接收狀況之資訊發送至基地台。接收部按來自基地台之指示,從2個以上之其他基地台進行同一內容之資料之接收。In order to solve the above problems, a mobile communication system including a plurality of base stations and two or more base stations of a plurality of base stations transmitting the same content at the same timing is provided. The mobile communication system includes a base station having a notification unit and a control unit, and a mobile station having a transmission unit and a reception unit. The notification unit notifies the mobile station of two or more other base stations that transmit the same content in the plurality of base stations. The control unit instructs the mobile station to receive data of the same content from two or more other base stations in accordance with information indicating the reception status of the wireless signals from the two or more other base stations on the mobile station. The transmitting unit transmits information indicating the reception status of the wireless signals from the two or more other base stations notified by the base station to the base station. The receiving unit receives data of the same content from two or more other base stations in accordance with an instruction from the base station.
為解決上述課題,提供一種包含有複數個基地台,且複數個基地台中2個以上之基地台在同一時序發送同一內容之資料之行動通訊系統的無線通訊方法。在此無線通訊方法,複數個基地台中之第1基地台將複數個基地台中在進行同一內容之資料之發送的2個以上第2基地台通知行動台。行動台將顯示來自業已通知之2個以上第2基地台之無線信號在行動台的接收狀況之資訊發送至第1基地台。第1基地台按顯示接收狀況之資訊,對行動台指示從2個以上之第2基地台進行同一內容之資料之接收。In order to solve the above problems, a wireless communication method for a mobile communication system including a plurality of base stations and two or more base stations of a plurality of base stations transmitting the same content at the same timing is provided. In the wireless communication method, the first base station of the plurality of base stations notifies the mobile station of the two or more base stations that transmit the same content in the plurality of base stations. The mobile station transmits information on the reception status of the mobile station from the two or more second base stations that have been notified to the first base station. The first base station instructs the mobile station to receive data of the same content from two or more second base stations in accordance with the information indicating the reception status.
根據上述行動通訊系統、基地台、行動台及無線通訊方法,可平穩地控制用以接收複數個基地台在同一時序發送之同一內容之資料的行動台之接收處理。According to the above mobile communication system, base station, mobile station, and wireless communication method, it is possible to smoothly control reception processing of a mobile station for receiving data of the same content transmitted by a plurality of base stations at the same timing.
本發明之上述及其他目的、特徵及優點根據與顯示作為本發明例之較佳實施形態之附加圖式相關的以下說明應可明瞭。The above and other objects, features, and advantages of the invention will be apparent from the description of the appended claims appended claims
第1圖係顯示第1實施形態之行動通訊系統之圖。Fig. 1 is a view showing a mobile communication system according to the first embodiment.
第2圖係顯示第2實施形態之行動通訊系統之圖。Fig. 2 is a view showing the mobile communication system of the second embodiment.
第3圖係顯示無線訊框之構造例之圖。Fig. 3 is a view showing a configuration example of a radio frame.
第4圖係顯示標準CP及長CP之例之圖。Fig. 4 is a diagram showing an example of a standard CP and a long CP.
第5圖係顯示第2實施形態之基地台之塊圖。Fig. 5 is a block diagram showing a base station of the second embodiment.
第6圖係顯示第2實施形態之MBSFN發送控制部之塊圖。Fig. 6 is a block diagram showing an MBSFN transmission control unit according to the second embodiment.
第7圖係顯示第2實施形態之行動台之塊圖。Fig. 7 is a block diagram showing a mobile station according to the second embodiment.
第8圖係顯示第2實施形態之發送開始控制之流程圖。Fig. 8 is a flow chart showing the transmission start control of the second embodiment.
第9圖係顯示第2實施形態之發送開始之流程的程序圖。Fig. 9 is a flowchart showing the flow of the start of transmission in the second embodiment.
第10圖係顯示第2實施形態之發送停止控制之第1流程圖。Fig. 10 is a first flowchart showing the transmission stop control of the second embodiment.
第11圖係顯示第2實施形態之發送停止控制之第2流程圖。Fig. 11 is a second flowchart showing the transmission stop control of the second embodiment.
第12圖係顯示第2實施形態之發送停止之流程的程序圖。Fig. 12 is a flowchart showing the flow of the transmission stop in the second embodiment.
第13圖係顯示複數個基地台與行動台之關係之第1圖。Figure 13 is a first diagram showing the relationship between a plurality of base stations and mobile stations.
第14圖係顯示複數個基地台與行動台之關係之第2圖。Figure 14 is a second diagram showing the relationship between a plurality of base stations and mobile stations.
第15圖係顯示複數個基地台與行動台之關係之第3圖。Figure 15 is a third diagram showing the relationship between a plurality of base stations and mobile stations.
第16圖係顯示MBSFN區域之例之圖。Fig. 16 is a diagram showing an example of an MBSFN area.
第17圖係顯示基地台之發送電力控制之圖。Figure 17 is a diagram showing the transmission power control of the base station.
第18圖係顯示MBSFN區域之例之另一圖。Figure 18 is another diagram showing an example of an MBSFN area.
第19圖係顯示第3實施形態之MBSFN發送控制部之塊圖。Fig. 19 is a block diagram showing an MBSFN transmission control unit in the third embodiment.
第20圖係顯示第3實施形態之發送開始控制之流程圖。Fig. 20 is a flow chart showing the transmission start control of the third embodiment.
第21圖係顯示第3實施形態之發送停止控制之第1流程圖。Fig. 21 is a first flowchart showing the transmission stop control of the third embodiment.
第22圖係顯示第3實施形態之發送停止控制之第2流程圖。Fig. 22 is a second flowchart showing the transmission stop control of the third embodiment.
第23圖係顯示第4實施形態之MBSFN發送控制部之塊圖。Fig. 23 is a block diagram showing an MBSFN transmission control unit in the fourth embodiment.
第24圖係顯示第4實施形態之MCE之塊圖。Fig. 24 is a block diagram showing the MCE of the fourth embodiment.
第25圖係顯示第4實施形態之發送開始之流程的程序圖。Fig. 25 is a flowchart showing the flow of the start of transmission in the fourth embodiment.
第26圖係顯示第4實施形態之發送停止之流程的程序圖。Fig. 26 is a flowchart showing the flow of the transmission stop in the fourth embodiment.
第27圖係顯示第5實施形態之MCE之塊圖。Figure 27 is a block diagram showing the MCE of the fifth embodiment.
第28圖係顯示第6實施形態之行動台之塊圖。Fig. 28 is a block diagram showing a mobile station according to the sixth embodiment.
第29圖係顯示第7實施形態之行動通訊系統之圖。Fig. 29 is a view showing the mobile communication system of the seventh embodiment.
以下,參照圖式,詳細說明本實施形態。Hereinafter, the present embodiment will be described in detail with reference to the drawings.
第1實施形態First embodiment
第1圖係顯示第1實施形態之行動通訊系統之圖。第1實施形態之行動通訊系統包含有複數個基地台及行動台30。Fig. 1 is a view showing a mobile communication system according to the first embodiment. The mobile communication system according to the first embodiment includes a plurality of base stations and mobile stations 30.
複數個基地台含有在同一時序協作發送同一內容之資料之2個以上的基地台。舉例言之,該2個以上之基地台執行前述MBSFN發送。又,複數個基地台亦含有不進行上述資料發送之基地台。該等複數個基台地含有基地台10、21、22。基地台21、21協作進行同一內容之資料發送。基地台10可與基地台21、22一同進行同一內容之資料發送,亦可不進行。A plurality of base stations include two or more base stations that cooperatively transmit data of the same content at the same timing. For example, the two or more base stations perform the foregoing MBSFN transmission. In addition, a plurality of base stations also include base stations that do not transmit the above data. The plurality of base stations include base stations 10, 21, and 22. The base stations 21 and 21 cooperate to transmit data of the same content. The base station 10 can transmit data of the same content together with the base stations 21 and 22, or not.
基地台10具有通知部11及控制部12。通知部11將複數個基地台中在同一時序在進行同一內容之資料發送之2個以上的其他基地台(基地台21、22)通知行動台30。控制部12按從行動台30接收,顯示來自所通知之基地台21、22之無線信號之行動台30的接收狀況之資訊等,對行動台30指示從基地台21、22進行同一內容之資料之接收。除了參照顯示接收狀況之資訊外,亦可參照來自行動台30之資料發送要求,進行對行動台30之指示。The base station 10 has a notification unit 11 and a control unit 12. The notification unit 11 notifies the mobile station 30 of two or more other base stations (base stations 21 and 22) that transmit data of the same content at the same timing in a plurality of base stations. The control unit 12 receives the information on the reception status of the mobile station 30 from the notified base stations 21 and 22, and displays the information on the same content from the base stations 21 and 22 to the mobile station 30. Received. In addition to the information indicating the reception status, the instruction to the mobile station 30 can be performed with reference to the data transmission request from the mobile station 30.
行動台30具有發送部31及接收部32。發送部31收到在同一時間在進行同一內容之資料發送之基地台21、22的通知,將顯示來自基地台21、22之無線信號之接收狀況的資訊發送至基地台10。接收部32按發送顯示接收狀況之資訊後收到之來自基地台10之指示,從基地台21、22進行同一內容之資料之接收。The mobile station 30 has a transmitting unit 31 and a receiving unit 32. The transmitting unit 31 receives the notification of the base stations 21 and 22 that are transmitting the same content at the same time, and transmits information indicating the reception status of the wireless signals from the base stations 21 and 22 to the base station 10. The receiving unit 32 receives the data of the same content from the base stations 21 and 22 in response to an instruction from the base station 10 received after transmitting the information indicating the reception status.
即,基地台10將複數個基地台中在同一時序在進行同一內容之資料之發送的基地台21、22通知行動台30(步驟S1)。行動台30將顯示來自所通知之基地台21、22之無線信號之行動台30的接收狀況之資訊發送至基地台10(步驟S2)。基地台10按顯示接收狀況之資訊,對行動台30指示從基地台21、22進行同一內容之資料之接收(步驟S3)。行動台30收到來自基地台10之指示,接收基地台21、22在同一時序所發送之同一內容之資料(步驟S4)。In other words, the base station 10 notifies the mobile station 30 of the base stations 21 and 22 that transmit the same content at the same time in the plurality of base stations (step S1). The mobile station 30 transmits information on the reception status of the mobile station 30 displaying the radio signals from the notified base stations 21 and 22 to the base station 10 (step S2). The base station 10 instructs the mobile station 30 to receive data of the same content from the base stations 21 and 22 in accordance with the information indicating the reception status (step S3). The mobile station 30 receives an instruction from the base station 10 and receives data of the same content transmitted by the base stations 21 and 22 at the same timing (step S4).
在此,通知部11亦可依基地台10之同一內容之資料發送的執行狀況,將基地台21、22通知行動台30。舉例言之,於連接於基地台10之行動台中,從2個以上之基地台接收同一內容之行動台數未滿預定閾值時,考慮進行通知。又,於在從基地台10與其他基地台協作發送之資料之量與可用於該資料發送之無線資源之量算出的傳送效率未滿預定閾值時,考慮進行通知。Here, the notification unit 11 may notify the mobile station 30 of the base stations 21 and 22 in accordance with the execution status of the data transmission of the same content of the base station 10. For example, in the mobile station connected to the base station 10, when the number of mobile stations receiving the same content from two or more base stations is less than a predetermined threshold, the notification is considered. Further, when the transmission efficiency calculated by the amount of data transmitted from the base station 10 in cooperation with other base stations and the amount of radio resources available for transmission of the data is less than a predetermined threshold, it is considered to be notified.
是否進行對行動台30之通知亦可於行動台30對基地台10要求2個以上之基地台協作發送之資料時判斷。又,亦可於連接於基地台10,且在從2個以上之基地台接收同一內容之資料之行動台數減少時判斷。Whether or not the notification to the mobile station 30 is performed may be determined when the mobile station 30 requests the base station 10 to request information transmitted by two or more base stations. Further, it may be determined when the number of mobile stations connected to the base station 10 and receiving data of the same content from two or more base stations is reduced.
又,行動台30亦可測量無線信號之接收電力或無線線路品質(CIR(Carrier to Interference Ratio))等之接收品質作為來自基地台21、22之無線信號之接收狀況。當基地台21、22以分時發送同一內容之資料及其他之普通資料時,行動台30亦可使用發送同一內容之資料之區間內之無線信號,來測量接收品質,亦可使用發送普通資料之區間內之無線信號,來測量接收品質。Further, the mobile station 30 can measure the reception quality of the radio signal or the reception quality of the radio channel quality (CIR (Carrier to Interference Ratio)) as the reception status of the radio signals from the base stations 21 and 22. When the base station 21, 22 transmits the same content data and other common data in a time-sharing manner, the mobile station 30 can also use the wireless signal in the interval in which the data of the same content is transmitted to measure the reception quality, and can also use the transmission of the general data. The wireless signal in the interval measures the reception quality.
顯示從發送部31發送至基地台10之接收狀況之資訊可為顯示基地台21、22各自之接收品質之資訊,亦可為顯示關於基地台21、22全體之1個接收品質之資訊。又,顯示接收狀況之資訊亦可為顯示在行動台30所測量之接收品質是否滿足預定基準之資訊。The information indicating the reception status transmitted from the transmitting unit 31 to the base station 10 may be information indicating the reception quality of each of the base stations 21 and 22, or may be information indicating one reception quality of the entire base stations 21 and 22. Further, the information indicating the reception status may be information indicating whether or not the reception quality measured by the mobile station 30 satisfies a predetermined criterion.
又,控制部12亦可僅於根據顯示接收狀況之資訊顯示之接收品質超過預定閾值時,對行動台30指示從基地台21、22進行同一內容之資料之接收。是否對行動台30進行指示之判斷可由控制部12進行,亦可由與基地台10以網路連接之控制裝置進行。為後者時,基地台10將顯示從行動台30所接收之接收狀況之資訊轉送至控制裝置。Moreover, the control unit 12 may instruct the mobile station 30 to receive data of the same content from the base stations 21 and 22 only when the reception quality of the information display according to the display reception status exceeds a predetermined threshold. The determination of whether or not to instruct the mobile station 30 may be performed by the control unit 12 or by a control device connected to the base station 10 via a network. In the latter case, the base station 10 transmits information indicating the reception status received from the mobile station 30 to the control device.
又,控制部12亦可於對行動台30指示從基地台21、22接收同一內容之資料時,控制成基地台10不發送該同一內容之資料。另一方面,亦可於不對行動台30指示從基地台21、22接收時(例如在行動台30所測量之接收品質不滿足預定基準時),控制成基地台10自身進行該同一內容之資料發送。Further, when the control unit 12 instructs the mobile station 30 to receive the same content from the base stations 21 and 22, the control unit 12 may control the base station 10 not to transmit the same content. On the other hand, when the mobile station 30 is not instructed to receive from the base stations 21 and 22 (for example, when the reception quality measured by the mobile station 30 does not satisfy the predetermined reference), the base station 10 itself may be controlled to perform the same content. send.
根據此種第1實施形態之行動通訊系統,即使在同一時時序發送同一內容之資料之基地台與不發送之基地台混合存在之環境下,亦可平穩地進行行動台之接收處理。即,基地台10可引導行動台30與複數基地台中在同一時序在發送同一內容之基地台(基地台21、22)進行通訊。又,基地台10於將行動台引導至基地台21、22後,不進行同一內容之資料發送亦可。因而,易抑制在同一時序發送同一內容之資料之基地台數,而可謀求無線資源之利用效率之提高。According to the mobile communication system of the first embodiment, even when the base station that transmits the data of the same content at the same time is mixed with the base station that does not transmit, the reception processing of the mobile station can be smoothly performed. That is, the base station 10 can guide the mobile station 30 to communicate with the base stations (base stations 21, 22) that transmit the same content at the same timing as the plurality of base stations. Further, after the base station 10 guides the mobile station to the base stations 21 and 22, the data transmission of the same content may not be performed. Therefore, it is easy to suppress the number of base stations that transmit data of the same content at the same timing, and it is possible to improve the utilization efficiency of radio resources.
在以下之第2~第7實施形態中,設想將在第1實施形態所說明之無線通訊方法應用於LTE系統或LTE-A系統之情形。惟,上述無線通訊方法當然亦可應用於其他種類之行動通訊系統。In the following second to seventh embodiments, a case where the wireless communication method described in the first embodiment is applied to an LTE system or an LTE-A system is assumed. However, the above wireless communication method can of course be applied to other types of mobile communication systems.
第2實施形態Second embodiment
第2圖係顯示第2實施形態之行動通訊系統之圖。第2實施形態之行動通訊系統包含有具有基地台100、200之複數個基地台、行動台300、MCE(Multi-cell/multicast Coordination Entity)410、MME(Mobility Management Entity)510及MBMS閘道520。Fig. 2 is a view showing the mobile communication system of the second embodiment. The mobile communication system according to the second embodiment includes a plurality of base stations 100, 200, a mobile station 300, an MCE (Multi-cell/multicast Coordination Entity) 410, an MME (Mobility Management Entity) 510, and an MBMS gateway 520. .
基地台100、200係可與行動台300無線通訊之無線通訊裝置。基地台100、200藉由有線網路與MCE410及MBMS閘道520連接。基地台100、200可進行MBSFN發送。即,可從MBMS閘道520接收MBMS資料,在同一時序使用同一頻率及同一調變方式,來發送同一內容之MBMS資料。又,在圖中未示之SAE(System Architecture Evolution)閘道與行動台300間轉送MBMS資料以外之用戶資料。The base stations 100 and 200 are wireless communication devices that can wirelessly communicate with the mobile station 300. The base stations 100, 200 are connected to the MCE 410 and MBMS gateways 520 via a wired network. The base stations 100 and 200 can perform MBSFN transmission. That is, the MBMS data can be received from the MBMS gateway 520, and the same frequency and the same modulation method can be used at the same timing to transmit the MBMS data of the same content. Further, user data other than the MBMS data is transferred between the SAE (System Architecture Evolution) gateway and the mobile station 300 not shown.
行動台300係可在與包含基地台100、200之複數個基地台間無線通訊之無線終端裝置,例如為行動電話或行動資訊終端裝置。行動台300接收以MBSFN發送之MBMS資料。即,將來自進行MBSFN發送之複數個基地台之無線信號合成,進行解調及解碼,而抽出MBMS資料。藉此,可提高MBMS資料之接收特性。又,行動台300與目前在連接之基地台間發送接收MBMS資料以外之用戶資料。此外,在此,行動台300係連接於基地台100者。The mobile station 300 is a wireless terminal device that can wirelessly communicate with a plurality of base stations including the base stations 100, 200, such as a mobile phone or a mobile information terminal device. The mobile station 300 receives the MBMS data transmitted in the MBSFN. That is, the radio signals from the plurality of base stations transmitting the MBSFN are combined, demodulated and decoded, and the MBMS data is extracted. Thereby, the receiving characteristics of the MBMS data can be improved. Further, the mobile station 300 transmits and receives user data other than the MBMS data to and from the currently connected base station. Further, here, the mobile station 300 is connected to the base station 100.
MCE410係控制基地台100、200之MBSFN發送之通訊裝置。MCE410藉由有線網路與基地台100、200發送接收控制資訊,進行用以進行MBSFN發送之基地台之管理及MBSFN發送之排程。又,可按排程結果,對MBMS閘道520指示MBMS資料之發送。The MCE 410 is a communication device that controls the MBSFN transmission of the base stations 100 and 200. The MCE 410 transmits and receives control information through the wired network and the base stations 100 and 200, and performs scheduling for management of the base station for MBSFN transmission and MBSFN transmission. Further, the MBMS gateway 520 can be instructed to transmit MBMS data according to the scheduling result.
MME510係進行行動管理、即行動台300之所在細胞之管理或行動台300之傳呼(播叫)之通訊裝置。MME510藉由無線網路與MCE410連接。The MME 510 is a communication device that performs mobility management, that is, management of cells in which the mobile station 300 is located or paging (broadcasting) of the mobile station 300. The MME 510 is connected to the MCE 410 via a wireless network.
MBMS閘道520係按來自MCE410之指示,進行MBMS資料之發送處理之通訊裝置。MBMS閘道520對進行MBSFN發送之基地台發送MBMS資料。The MBMS gateway 520 is a communication device that performs transmission processing of MBMS data in accordance with an instruction from the MCE 410. The MBMS gateway 520 transmits MBMS data to the base station that performs MBSFN transmission.
此種行動通訊裝置如前述可實現作為LTE系統或LTE-A系統。此外,在3GPP,LTE之MBSFN之規格以第9版(Release9)之規格書定義,LTE-A之MBSFN之規格以第10版(Release10)之規格書定義。Such a mobile communication device can be implemented as an LTE system or an LTE-A system as described above. In addition, in 3GPP, the specifications of MBSFN of LTE are defined in the specification of Release 9 (Release 9), and the specifications of MBSFN of LTE-A are defined in the specification of Release 10 (Release 10).
第3圖係無線訊框之構造例之圖。第3圖所示之無線訊框可在基地台100、200與行動台300間發送接收。在此,假設雙工方式使用FDD(Frequency Division Duplex)之情形。即,關於下行鏈路(DL:DownLink)及上行鏈路(UL:UpLink),可發送接收第3圖所示之無線訊框。惟,雙工方式亦可使用TDD(Time Division Duplex)。又,無線訊框之構造不限於此。Fig. 3 is a diagram showing a configuration example of a radio frame. The radio frame shown in FIG. 3 can be transmitted and received between the base stations 100, 200 and the mobile station 300. Here, a case where the FDD (Frequency Division Duplex) is used in the duplex mode is assumed. That is, regarding the downlink (DL: DownLink) and the uplink (UL: UpLink), the radio frame shown in FIG. 3 can be transmitted and received. However, the duplex mode can also use TDD (Time Division Duplex). Also, the configuration of the radio frame is not limited to this.
在此例中,10ms週期之無線訊框包含1ms寬度之子訊框(子訊框#0~#9)。無線資源之排程以子訊框單位進行。子訊框內之無線資源細分化成時間方向及頻率方向來管理。頻率方向之最小單位為副載波,時間方向之最小單位為符號。各子訊框如後述包含12個或14個符號。In this example, the 10ms periodic radio frame contains sub-frames of 1ms width (subframes #0~#9). The scheduling of wireless resources is performed in subframe units. The radio resources in the sub-frame are subdivided into time and frequency directions for management. The smallest unit of the frequency direction is the subcarrier, and the smallest unit of the time direction is the symbol. Each sub-frame contains 12 or 14 symbols as will be described later.
此種頻率×時間之區域之無線資源分配於各種通道。於DL無線訊框設用以發送MBMS資料以外之普通用戶資料或上位層之控制資訊之PDSCH(Physical Downlink Shared CHannel)。還設用以發送MBMS資料及MBSFN控制信號之PMCH(Physical Multicast CHannel)。The radio resources of such a frequency x time zone are allocated to various channels. The PDSCH (Physical Downlink Shared CHannel) for transmitting the normal user data other than the MBMS data or the control information of the upper layer is provided in the DL radio frame. A PMCH (Physical Multicast CHannel) for transmitting MBMS data and MBSFN control signals is also provided.
又,於DL無線訊框設用以發送同步信號之P-SCH(Primary Synchronization CHannel)及S-SCH(Secondary Synchronization CHannel)。又,在DL無線訊框,發送為已知之引示信號之參照信號(RS:Reference Signal)。Further, a P-SCH (Primary Synchronization CHannel) and an S-SCH (Secondary Synchronization CHannel) for transmitting a synchronization signal are provided in the DL radio frame. Further, in the DL radio frame, a reference signal (RS: Reference Signal) which is a known pilot signal is transmitted.
於UL無線訊框設用以發送用戶資料及控制資訊之PUSCH(Physical Uplink Shared CHannel)。還設用以發送L1/L2(Layer 1/Layer 2)控制信號之PUCCH(Physical Uplink Control CHannel)。A PUSCH (Physical Uplink Shared CHannel) for transmitting user data and control information in the UL radio frame. A PUCCH (Physical Uplink Control CHannel) for transmitting an L1/L2 (Layer 1/Layer 2) control signal is also provided.
在此,MBMS資料可使用為邏輯通道之MTCH(Multicast Traffic CHannel)來傳送。MBSFN控制信號可使用為邏輯通道之MCCH(Multicast Control CHannel)來傳送。MTCH及MCCH映射至為訊務通道之MCH(Multicast CHannel)。MCH映射至為實體通道之上述PMCH。Here, the MBMS data can be transmitted using a MTCH (Multicast Traffic CHannel) of a logical channel. The MBSFN control signal can be transmitted using MCCH (Multicast Control CHannel) which is a logical channel. The MTCH and MCCH are mapped to the MCH (Multicast CHannel) of the traffic channel. The MCH is mapped to the above PMCH which is a physical channel.
用於MBSFN發送之子訊框(MBSFN子訊框)及其他之子訊框(普通子訊框)之構造不同。具體言之,普通子訊框含有14個符號,各符號包含後述之標準CP(Cyclic Prefix)。另一方面,MBSFN子訊框含有12個符號,各符號包含後述之長CP。標準CP與長CP信號長不同。在MBSFN子訊框,除了一部份之例外外,無法發送MBMS資料以外之用戶資料。The sub-frame (MBSFN sub-frame) used for MBSFN transmission and other sub-frames (ordinary sub-frames) are constructed differently. Specifically, the normal subframe contains 14 symbols, and each symbol includes a standard CP (Cyclic Prefix) to be described later. On the other hand, the MBSFN subframe contains 12 symbols, and each symbol includes a long CP to be described later. The standard CP is different in length from the long CP signal. In the MBSFN sub-frame, except for a part of the exception, it is not possible to send user data other than MBMS data.
此外,多元連接方式係可於DL無線訊框使用例如OFDMA(Orthogonal Frequency Division Multiple Access)。又,可於UL無線訊框使用例如SC-FDMA(Single-Carrier Frequency Division Multiple Access)或NxSC-FDMA(N times SC-FDMA)。In addition, the multi-connection method can use, for example, OFDMA (Orthogonal Frequency Division Multiple Access) in the DL radio frame. Further, for example, SC-FDMA (Single-Carrier Frequency Division Multiple Access) or NxSC-FDMA (N times SC-FDMA) can be used for the UL radio frame.
第4圖係顯示標準CP及長CP之例之圖。如第4圖所示,各符號包含為資料部份之有效符號及作為保護區間之CP。CP係複製有效符號之末尾部份之信號者,附加於有效符號前。標準CP之時間長為4.69μ秒,長CP之時間長為16.67μ秒。有效符號長在使用標準CP之情形及使用長CP之情形皆相同。Fig. 4 is a diagram showing an example of a standard CP and a long CP. As shown in Fig. 4, each symbol contains a valid symbol for the data portion and a CP as a guard interval. The CP is a signal that copies the last part of the valid symbol and is appended to the valid symbol. The standard CP has a length of 4.69 μsec and a long CP has a length of 16.67 μsec. The effective symbol length is the same for both the standard CP and the long CP.
如前述,在MBSFN子訊框中,使用長CP。行動台300可將延遲時間為CP之時間長以下之延遲波與前進波合成後解調。是故,藉使用長CP,比起使用標準CP,行動台300可合成、解調較遠之基地台之信號。As mentioned above, in the MBSFN subframe, a long CP is used. The mobile station 300 can combine the delayed wave whose delay time is less than the time length of the CP with the forward wave and demodulate it. Therefore, by using a long CP, the mobile station 300 can synthesize and demodulate signals of a remote base station than a standard CP.
第5圖係顯示第2實施形態之基地台之塊圖。基地台100具有天線111、無線接收部112、解調解碼部113、品質資訊抽出部114、排程器115、控制資訊生成部116、MBSFN要求抽出部117、MBSFN發送控制部120、MBSFN控制信號生成部131、測量要求生成部132、同步信號生成部133、RS生成部134、映射部135、編碼調變部136及無線發送部137。其他基地台亦可以與基地台100同樣之塊構造實現。Fig. 5 is a block diagram showing a base station of the second embodiment. The base station 100 includes an antenna 111, a radio reception unit 112, a demodulation and decoding unit 113, a quality information extraction unit 114, a scheduler 115, a control information generation unit 116, an MBSFN request extraction unit 117, an MBSFN transmission control unit 120, and an MBSFN control signal. The generating unit 131, the measurement request generating unit 132, the synchronization signal generating unit 133, the RS generating unit 134, the mapping unit 135, the encoding and transforming unit 136, and the wireless transmitting unit 137 are provided. Other base stations can also be implemented in the same block structure as base station 100.
天線111接收行動台300所發送之無線信號,將之輸出至無線接收部112。又,無線輸出從無線發送部137所取得之發送信號。此外,亦可不設發送接收兼用之天線,而是將發送用天線與接收用天線個別設於基地台100。又,亦可使用複數個天線,進行分集發送。The antenna 111 receives the wireless signal transmitted by the mobile station 300 and outputs it to the wireless receiving unit 112. Further, the transmission signal acquired from the wireless transmission unit 137 is wirelessly output. Further, the transmitting antenna and the receiving antenna may be separately provided to the base station 100 instead of the antenna for transmitting and receiving. Further, a plurality of antennas can be used for diversity transmission.
無線接收部112將從天線111所取得之信號進行無線信號處理,而進行從高頻之無線信號至低頻之基頻信號之轉換(低向變頻)。無線接收部112為進行無線信號處理,而具有低雜訊放大器(LNA:Low Noise Amplifier)、頻率轉換器、帶通濾波器(BPF:Band Pass Filter)、A/D(Analog to Digital)轉換器等之電路。The radio reception unit 112 performs radio signal processing on the signal obtained from the antenna 111, and performs conversion (low-range conversion) from a high-frequency radio signal to a low-frequency baseband signal. The wireless receiving unit 112 has a low noise amplifier (LNA), a frequency converter, a band pass filter (BPF), and an A/D (Analog to Digital) converter for performing wireless signal processing. Wait for the circuit.
解調解碼部113將從無線接收部112所取得之基頻信號解調及錯誤校正解碼。解調及解碼以預定調變編碼方式(MCS:Modulation and Coding Scheme)或對應於從排程器115所指示之調變編碼方式之方法進行。所抽出之用戶資料轉送至SAE閘道。The demodulation and decoding unit 113 demodulates and corrects the baseband signal obtained by the radio reception unit 112. Demodulation and decoding are performed in a predetermined modulation coding scheme (MCS: Modulation and Coding Scheme) or a method corresponding to the modulation coding mode indicated by the scheduler 115. The extracted user data is forwarded to the SAE gateway.
品質資訊抽出部114抽出為行動台300所發送之控制資訊之顯示接收品質的測量報告之品質資訊。然後,品質資訊抽出部114將與一般之資料發送相關之品質資訊輸出至排程器115,並將與MBSFN發送相關之品質資訊輸出至MBSFN發送控制部120。The quality information extracting unit 114 extracts the quality information of the measurement report indicating the reception quality of the control information transmitted by the mobile station 300. Then, the quality information extracting unit 114 outputs the quality information related to the general data transmission to the scheduler 115, and outputs the quality information related to the MBSFN transmission to the MBSFN transmission control unit 120.
排程器115依從品質資訊抽出部114所取得之品質資訊,將無線資源分配至行動台300。然後,將無線資源之分配狀況通知無線接收部112、解調解碼部113、控制資訊生成部116、編碼調變部136及無線發送部137。又,排程器115依品質資訊,適當地選擇調變編碼方式。接著,將所選擇之調變編碼方式通知解調解碼部113、控制資訊生成部116及編碼調變部136。The scheduler 115 distributes the radio resources to the mobile station 300 in accordance with the quality information acquired by the quality information extracting unit 114. Then, the radio reception unit 112, the demodulation decoding unit 113, the control information generation unit 116, the code modulation unit 136, and the radio transmission unit 137 are notified of the allocation of the radio resources. Further, the scheduler 115 appropriately selects the modulation coding method based on the quality information. Next, the selected modulation and coding scheme is notified to the demodulation and decoding unit 113, the control information generation unit 116, and the code modulation unit 136.
控制資訊生成部116依來自排程器115之通知,生成使用PDCCH發送之控制資訊。此控制資訊含有顯示無線資源之分配之資訊及顯示適用於用戶資料之調變編碼方式的資訊等。控制資訊生成部116將所生成之控制資訊輸出至映射部135。The control information generating unit 116 generates control information transmitted using the PDCCH in accordance with the notification from the scheduler 115. This control information includes information showing the allocation of wireless resources and information indicating the modulation coding method applicable to the user data. The control information generating unit 116 outputs the generated control information to the mapping unit 135.
MBSFN要求抽出部117抽出行動台300所發送之MBSFN要求(顯示MBSFN發送之要求之控制資訊)。MBSFN要求含有顯示MBMS資料之資訊,以設於UL無線訊框之PUSCH發送。MBSFN要求抽出部117將所抽出之MBSFN要求輸出至MBSFN發送控制部120。The MBSFN request extraction unit 117 extracts the MBSFN request (the control information indicating the request for MBSFN transmission) transmitted from the mobile station 300. The MBSFN requires information containing the MBMS data to be transmitted on the PUSCH of the UL radio frame. The MBSFN request extraction unit 117 outputs the extracted MBSFN request to the MBSFN transmission control unit 120.
MBSFN發送控制部120與MCE410合作控制MBSFN發送。具體言之,當MBSFN發送控制部120從MBSFN要求抽出部117取得MBSFN要求時,將之轉送至MCE410。又,當基地台100之MBSFN發送之執行狀況滿足預定條件時,將在進行MBSFN發送之周邊基地台通知測量要求生成部132。The MBSFN transmission control unit 120 cooperates with the MCE 410 to control MBSFN transmission. Specifically, when the MBSFN transmission control unit 120 acquires the MBSFN request from the MBSFN request extraction unit 117, it transfers it to the MCE 410. When the execution status of the MBSFN transmission of the base station 100 satisfies the predetermined condition, the measurement request generation unit 132 is notified to the neighboring base station that performs the MBSFN transmission.
又,MBSFN發送控制部120於根據從品質資訊抽出部114所取得之品質資訊顯示之接收品質滿足預定條件時,將從其他基地台接收MBMS資料之指示通知MBSFN控制信號生成部131。又,對MCE410要求停止MBSFN發送。MBSFN發送控制部120亦可於檢測出連接於基地台100,且在接收MBMS資料之行動台數減少時,進行與接收MBSFN要求時相同之控制。Further, when the reception quality of the quality information display obtained from the quality information extracting unit 114 satisfies a predetermined condition, the MBSFN transmission control unit 120 notifies the MBSFN control signal generating unit 131 of an instruction to receive the MBMS data from another base station. Also, the MCE 410 is required to stop the MBSFN transmission. The MBSFN transmission control unit 120 may also perform the same control as when the MBSFN request is received, when detecting the connection to the base station 100 and reducing the number of mobile stations receiving the MBMS data.
MBSFN控制信號生成部131按來自MBSFN發送控制部120之通知,生成顯示使行動台300從其他基地台接收MBMS資料之指示的控制信號。又,依從MCE410所接收之控制資訊,生成用於接收MBMS資料之MBSFN控制信號。MBSFN控制信號生成部131將所生成之控制信號輸出至映射部135。The MBSFN control signal generating unit 131 generates a control signal for instructing the mobile station 300 to receive the MBMS data from another base station in response to the notification from the MBSFN transmission control unit 120. Further, in accordance with the control information received by the MCE 410, an MBSFN control signal for receiving the MBMS data is generated. The MBSFN control signal generation unit 131 outputs the generated control signal to the mapping unit 135.
測量要求生成部132從MBSFN發送控制部120收到通知,而生成對行動台300之接收品質之測量要求。測量要求含有顯示在周邊基地台(例如存在於與基地台100相同之MBSFN區域內之其他基地台)中在進行MBSFN發送之基地台之資訊。測量要求生成部132將所生成之測量要求輸出至映射部135。The measurement request generation unit 132 receives the notification from the MBSFN transmission control unit 120, and generates a measurement request for the reception quality of the mobile station 300. The measurement request includes information of the base station that performs MBSFN transmission in the peripheral base station (for example, other base stations existing in the same MBSFN area as the base station 100). The measurement request generation unit 132 outputs the generated measurement request to the mapping unit 135.
同步信號生成部133生成對應於賦與基地台100管理之細胞之細胞ID的同步信號(主同步信號及輔助信號)。同步信號生成部133將所生成之同步信號輸出至映射部135。The synchronization signal generation unit 133 generates a synchronization signal (a main synchronization signal and an auxiliary signal) corresponding to the cell ID assigned to the cell managed by the base station 100. The synchronization signal generation unit 133 outputs the generated synchronization signal to the mapping unit 135.
RS生成部134生成為已知之引示信號之參照信號。RS生成部134將所生成之參照信號輸出至映射部135。The RS generation unit 134 generates a reference signal that is a known pilot signal. The RS generation unit 134 outputs the generated reference signal to the mapping unit 135.
映射部135將從MBMS閘道520取得之MBMS資料及從SAE閘道取得之MBMS資料以外之用戶資料映射至DL無線訊框。又,將控制資訊生成部116、MBSFN控制信號生成部131、測量要求生成部132、同步信號生成部133及RS生成部134取得之控制資訊/控制信號映射至DL無線訊框。映射部135將映射後之資料依序輸出至編碼調變部136。The mapping unit 135 maps the MBMS data acquired from the MBMS gateway 520 and the user data other than the MBMS data acquired from the SAE gateway to the DL radio frame. Further, the control information generating unit 116, the MBSFN control signal generating unit 131, the measurement request generating unit 132, the synchronization signal generating unit 133, and the control information/control signal acquired by the RS generating unit 134 are mapped to the DL radio frame. The mapping unit 135 sequentially outputs the mapped data to the encoding and transforming unit 136.
編碼調變部136將從映射部135所取得之資料錯誤校正編碼及調變,生成作為發送信號之基頻信號,將之輸至無線發送部137。編碼及調變使用預定調變編碼方式或從排程器115所指示之調變編碼方式。The code modulation unit 136 corrects the data error correction code and modulation obtained from the mapping unit 135, generates a baseband signal as a transmission signal, and outputs the result to the wireless transmission unit 137. The encoding and modulation are performed using a predetermined modulation coding scheme or a modulation coding scheme indicated by the scheduler 115.
無線發送部137將從編碼調變部136所取得之發送信號進行無線信號處理,從低頻之基頻信號轉換成高頻之無線信號(增頻變頻)。無線發送部137為進行無線信號處理,而具有D/A(Digital to Analog)轉換器、頻率轉換器、帶通濾波器、電力放大器等之電路。The radio transmitting unit 137 performs radio signal processing on the transmission signal obtained from the encoding and transforming unit 136, and converts the low-frequency baseband signal into a high-frequency radio signal (up-converting frequency conversion). The wireless transmitting unit 137 includes a D/A (Digital to Analog) converter, a frequency converter, a band pass filter, a power amplifier, and the like for performing wireless signal processing.
第6圖係顯示第2實施形態之MBSFN發送控制信號之塊圖。MBSFN發送控制部120具有行動台數管理部121、品質閾值記憶部122、品質判定部123、發送判定部124及測量要求控制部125。Fig. 6 is a block diagram showing an MBSFN transmission control signal in the second embodiment. The MBSFN transmission control unit 120 includes a mobile station number management unit 121, a quality threshold value storage unit 122, a quality determination unit 123, a transmission determination unit 124, and a measurement request control unit 125.
行動台數管理部121管理連接於基地台100之行動台中,在從基地台100接收MBMS資料之行動台之數。當行動台數管理部121從MBSFN要求抽出部117取得MBSFN要求時,將行動台數增量。又,當連接於基地台100之行動台檢測出交遞至其他細胞或停止MBMS資料之接收時,則將行動台數減量。The mobile station number management unit 121 manages the number of mobile stations that receive the MBMS data from the base station 100 in the mobile station connected to the base station 100. When the mobile station number management unit 121 acquires the MBSFN request from the MBSFN request extraction unit 117, the number of mobile stations is incremented. Further, when the mobile station connected to the base station 100 detects the handover to another cell or stops the reception of the MBMS data, the number of mobile stations is reduced.
品質閾值記憶部122記憶用於行動台300可否從其他基地台接收MBMS資料之判斷之接收品質的閾值。The quality threshold value storage unit 122 stores a threshold value of the reception quality for determining whether the mobile station 300 can receive the MBMS data from another base station.
當品質判定部123從品質資訊抽出部114取得與MBSFN發送相關之品質資訊時,比較品質資訊顯示之接收品質與記憶於品質閾值記憶部122之閾值。此時,當所取得之品質資訊為顯示進行MBSFN發送之基地台各自之接收品質的資訊時,品質判定部123統計處理各接收品質,算出2個以上之基地台全體之接收品質,與閾值比較。然後,將接收品質是否為閾值以上通知發送判定部124。When the quality determination unit 123 acquires the quality information related to the MBSFN transmission from the quality information extraction unit 114, the quality determination unit 123 compares the reception quality of the quality information display with the threshold value stored in the quality threshold value storage unit 122. In this case, when the acquired quality information is information indicating the reception quality of each base station that performs MBSFN transmission, the quality determination unit 123 statistically processes each reception quality, and calculates the reception quality of all the base stations of two or more base stations, and compares with the threshold value. . Then, the transmission determination unit 124 is notified of whether or not the reception quality is equal to or greater than the threshold.
當發送判定部124從MBSFN要求抽出部117取得MBSFN要求時,將MBSFN要求轉送至MCE410,同時,比較行動台數管理部121管理之行動台數與預定閾值。當行動台數未滿閾值時,將發送測量要求通知測量要求控制部125。之後,當從品質判定部123被通知接收品質為閾值以上時,發送判定部124將MBMS資料之發送停止要求MCE410,同時,將從其他基地台接收MBMS資料之指示通知MBSFN控制信號生成部131。When the transmission determination unit 124 acquires the MBSFN request from the MBSFN request extraction unit 117, the transmission determination unit 124 transfers the MBSFN request to the MCE 410, and compares the number of mobile stations managed by the mobile station number management unit 121 with a predetermined threshold. When the number of mobile stations is less than the threshold, the measurement request notification measurement request control unit 125 is transmitted. After the quality determination unit 123 is notified that the reception quality is equal to or greater than the threshold value, the transmission determination unit 124 stops the transmission of the MBMS data request MCE 410 and notifies the MBSFN control signal generation unit 131 of the instruction to receive the MBMS data from another base station.
即,發送判定部124於接收MBMS資料之行動台之數及接收品質兩者皆滿足條件時,控制成基地台100不發送MBMS資料。另一方面,於行動台之數及接收品質之至少一者不滿足條件時,則控制成基地台100發送MBMS資料。In other words, the transmission determining unit 124 controls the base station 100 not to transmit the MBMS data when both the number of mobile stations receiving the MBMS data and the reception quality satisfy the condition. On the other hand, when at least one of the number of mobile stations and the reception quality does not satisfy the condition, the base station 100 is controlled to transmit the MBMS data.
又,當發送判定部124檢測在接收MBMS資料之行動台之數減少時,比較行動台數管理部121管理之行動台數與預定閾值。當行動台數未滿閾值時,發送判定部124與取得MBSFN要求時同樣地,控制成基地台100不發送MBMS資料。此時,除了行動台數未滿閾值,還可以接收品質為閾值以上為條件。又,用於取得MBSFN要求時之控制之閾值與用於檢測出行動台數之減少時之控制的閾值可相同,亦可不同。Further, when the transmission determining unit 124 detects that the number of mobile stations receiving the MBMS data has decreased, the number of mobile stations managed by the mobile station number management unit 121 is compared with a predetermined threshold. When the number of mobile stations is less than the threshold, the transmission determining unit 124 controls the base station 100 not to transmit the MBMS data, as in the case of acquiring the MBSFN request. At this time, in addition to the number of mobile stations not exceeding the threshold, it is also possible to receive the quality as a threshold or more. Further, the threshold value for controlling when the MBSFN request is obtained may be the same as or different from the threshold for detecting the decrease in the number of mobile stations.
測量要求控制部125管理周邊基地台中在進行MBSFN發送之基地台。測量要求控制部125收到來自發送判定部124之通知,將在進行MBSFN發送之基地台通知測量要求生成部132。The measurement request control unit 125 manages the base station that performs MBSFN transmission in the neighboring base station. The measurement request control unit 125 receives the notification from the transmission determination unit 124, and notifies the measurement request generation unit 132 of the base station that performs the MBSFN transmission.
第7圖係顯示第2實施形態之行動台之塊圖。行動台300具有天線311、無線接收部312、解調解碼部313、控制資訊抽出部314、MBSFN控制信號抽出部315、MBSFN接收控制部316、終端控制部317、MBSFN要求生成部318、同步信號抽出部319、同步控制部320、RS抽出部321、品質測量部322、品質資訊生成部323、編碼調變部324及無線發送部325。其他行動台亦可以與行動台300同樣之塊構造實現。Fig. 7 is a block diagram showing a mobile station according to the second embodiment. The mobile station 300 includes an antenna 311, a radio reception unit 312, a demodulation and decoding unit 313, a control information extraction unit 314, an MBSFN control signal extraction unit 315, an MBSFN reception control unit 316, a terminal control unit 317, an MBSFN request generation unit 318, and a synchronization signal. The extraction unit 319, the synchronization control unit 320, the RS extraction unit 321, the quality measurement unit 322, the quality information generation unit 323, the code modulation unit 324, and the wireless transmission unit 325. Other mobile stations can also be implemented in the same block structure as the mobile station 300.
天線311接收1個或1個以上之基地台所發送之無線信號,將之輸出至無線接收部312。又,天線311以無線輸出從無線發送部325所取得之發送信號。此外,亦可不設發送接收兼用之天線,而是將發送用天線及接收用天線個別設於行動台300。又,亦可使用複數個天線,進行分集發送。The antenna 311 receives a wireless signal transmitted by one or more base stations, and outputs the wireless signal to the wireless receiving unit 312. Further, the antenna 311 wirelessly outputs the transmission signal acquired from the wireless transmission unit 325. Further, the transmitting antenna and the receiving antenna may be separately provided to the mobile station 300 instead of the antenna for transmitting and receiving. Further, a plurality of antennas can be used for diversity transmission.
無線接收部312將從天線311所取得之信號進行無線信號處理,進行從無線信號至基頻信號之低向變頻。無線信號部312為進行無線信號處理,而具有低雜訊放大器、頻率轉換器、帶通濾波器、A/D轉換器等之電路。The radio reception unit 312 performs radio signal processing on the signal obtained from the antenna 311, and performs low-direction conversion from the radio signal to the baseband signal. The wireless signal unit 312 is a circuit having a low noise amplifier, a frequency converter, a band pass filter, an A/D converter, or the like for performing wireless signal processing.
解調解碼部313將從無線接收部312所取得之基頻信號解調及錯誤校正解碼。解調及解碼以預定調變編碼方式或對應於從終端控制部317所指示之調變編碼方式之方法進行。The demodulation and decoding unit 313 demodulates and corrects the baseband signal obtained by the radio reception unit 312. Demodulation and decoding are performed in a predetermined modulation coding scheme or in a method corresponding to the modulation coding scheme indicated by the terminal control section 317.
在此,當接收以MBSFN發送之MBMS資料時,於接收信號重疊有從複數個基地台所發送之同一內容之信號。即,看起來似是於行動台300重疊有前進波及延遲波。此時,無線接收部312亦抽出相當於延遲時間為CP長以下之延遲波之信號。解調解碼部313對合成有來自所抽出之各基地台之信號者進行解調及解碼。Here, when the MBMS data transmitted by the MBSFN is received, a signal of the same content transmitted from a plurality of base stations is superimposed on the received signal. That is, it seems that the forward motion wave and the delayed wave are superimposed on the mobile station 300. At this time, the radio reception unit 312 also extracts a signal corresponding to a delay wave having a delay time of CP or less. The demodulation and decoding unit 313 demodulates and decodes a signal synthesized from each of the extracted base stations.
控制資訊抽出部314抽出以PDCCH(或PDSCH)所發送之控制資訊。此控制資訊含有顯示分配有PDSCH或PUSCH之無線資源之資訊及顯示適用於該等通道之調變編碼方式之資訊等。控制資訊抽出部314將所抽出之控制資訊輸出至終端控制部317。The control information extracting unit 314 extracts control information transmitted by the PDCCH (or PDSCH). The control information includes information indicating the radio resources to which the PDSCH or the PUSCH are allocated, and information indicating the modulation coding method applicable to the channels. The control information extracting unit 314 outputs the extracted control information to the terminal control unit 317.
MBSFN控制信號抽出部315抽出與MBSFN相關之控制信號。在此抽出之控制信號含有接收品質之測量要求、顯從連接中之基地台以外之基地台接收MBMS資料之指示之信號及以PMCH發送之MBSFN控制信號。測量要求含有顯示在進行MBSFN發送之基地台之信號。MBSFN控制信號含有用於MBMS資料之發送之無線資源及顯示適用於MBMS資料之調變編碼方式之信號等。MBSFN控制信號抽出部315將所抽出之控制信號輸出至MBSFN接收控制部316。The MBSFN control signal extracting unit 315 extracts a control signal related to the MBSFN. The control signal extracted here includes a measurement request of reception quality, a signal indicating an indication of receiving MBMS data from a base station other than the base station in the connection, and an MBSFN control signal transmitted by the PMCH. The measurement requires a signal indicating the base station that is transmitting the MBSFN. The MBSFN control signal includes a radio resource for transmitting MBMS data and a signal for displaying a modulation coding method suitable for MBMS data. The MBSFN control signal extracting unit 315 outputs the extracted control signal to the MBSFN reception control unit 316.
MBSFN接收控制部316於開始MBMS資料之接收時,對MBSFN要求生成部318指示MBSFN要求之發送。又,MBSFN接收控制部316依從MBSFN控制信號抽出部315所取得之控制信號,控制MBMS資料之接收處理。具體言之,當取得接收品質之測量要求時,將在進行MBSFN發送之基地台通知品質測量部322,指示品質測量。又,當取得顯示從其他基地台接收MBMS資料之指示之信號或MBSFN控制信號時,將控制信號之內容通知終端控制部317,以指示MBMS資料之接收。When the MBSFN reception control unit 316 starts reception of the MBMS data, the MBSFN reception control unit 316 instructs the MBSFN request generation unit 318 to transmit the MBSFN request. Further, the MBSFN reception control unit 316 controls the reception processing of the MBMS data in accordance with the control signal acquired by the MBSFN control signal extraction unit 315. Specifically, when the measurement request of the reception quality is obtained, the base station that performs the MBSFN transmission is notified of the quality measurement unit 322 to instruct the quality measurement. Further, when a signal or an MBSFN control signal indicating that the MBMS data is received from another base station is acquired, the content of the control signal is notified to the terminal control unit 317 to instruct reception of the MBMS data.
終端控制部317依從控制資訊抽出部314所取得之控制資訊,控制MBMS資料以外之用戶資料之發送接收。又,依從MBSFN接收控制部316通知之資訊,控制MBMS資料之接收。然後,終端控制部317控制無線接收部312、解調解碼部313、編碼調變部324及無線發送部325之動作。The terminal control unit 317 controls the transmission and reception of user data other than the MBMS data in accordance with the control information acquired by the control information extracting unit 314. Further, the reception of the MBMS data is controlled in accordance with the information notified by the MBSFN reception control unit 316. Then, the terminal control unit 317 controls the operations of the radio reception unit 312, the demodulation decoding unit 313, the code modulation unit 324, and the radio transmission unit 325.
MBSFN要求生成部318收到來自MBSFN接收控制部316之指示,生成顯示MBSFN要求、亦即MBSFN發送之開始要求之控制資訊。MBSFN要求生成部318將所生成之MBSFN要求輸出至編碼調變部324。The MBSFN request generation unit 318 receives an instruction from the MBSFN reception control unit 316, and generates control information indicating an MBSFN request, that is, a request for starting the MBSFN transmission. The MBSFN request generation unit 318 outputs the generated MBSFN request to the code modulation unit 324.
同步信號抽出部319抽出以P-SCH及S-SCH發送之同步信號(主同步信號及輔助同步信號),將之輸出至同步控制部320。The synchronization signal extracting unit 319 extracts the synchronization signals (main synchronization signal and auxiliary synchronization signal) transmitted by the P-SCH and the S-SCH, and outputs them to the synchronization control unit 320.
同步控制部320依從同步信號抽出部319所取得之同步信號,檢測關於無線訊框之時序。然後,將所檢測出之時序通知無線接收部312、解調解碼部313、RS抽出部321、編碼調變部324及無線發送部325,同時,反饋至同步信號抽出部319。The synchronization control unit 320 detects the timing of the radio frame in accordance with the synchronization signal acquired by the synchronization signal extraction unit 319. Then, the detected timing is notified to the radio reception unit 312, the demodulation decoding unit 313, the RS extraction unit 321, the code modulation unit 324, and the radio transmission unit 325, and is fed back to the synchronization signal extraction unit 319.
RS抽出部321抽出DL無線訊框所含之參照信號,將所抽出之參照信號輸出至品質測量部322。The RS extracting unit 321 extracts the reference signal included in the DL radio frame, and outputs the extracted reference signal to the quality measuring unit 322.
品質測量部322使用從RS抽出部321所取得之參照信號,測量CIR等之接收品質(或無線線路品質)。於從MBSFN接收控制部316通知基地台時,對所通知之基地台,測量接收品質。品質測量部322將測量結果輸出至品質資訊生成部323,同時,反饋至RS抽出部321。The quality measurement unit 322 measures the reception quality (or radio channel quality) such as CIR using the reference signal acquired from the RS extraction unit 321 . When the base station is notified from the MBSFN reception control unit 316, the reception quality is measured for the notified base station. The quality measuring unit 322 outputs the measurement result to the quality information generating unit 323 and feeds it back to the RS extracting unit 321.
此外,在進行MBSFN發送之基地台之接收品質可使用普通子訊框所含之參照信號來測量,亦可使用MBSFN子訊框所含之參照信號來測量。為前者時,可測量各基地台之接收品質。為後者時,可測量在進行MBSFN發送之2個以上之基地台全體的接收品質。當行動台300連接之基地台在進行MBSFN發送時,品質測量部322亦可進一步測量與連接中之基地台之MBSFN發送相關的接收品質。In addition, the reception quality of the base station that performs MBSFN transmission can be measured using the reference signal contained in the normal subframe, and can also be measured using the reference signal included in the MBSFN subframe. In the former case, the reception quality of each base station can be measured. In the latter case, it is possible to measure the reception quality of all of the base stations of two or more base stations that perform MBSFN transmission. When the base station to which the mobile station 300 is connected performs MBSFN transmission, the quality measurement unit 322 can further measure the reception quality related to the MBSFN transmission of the base station in the connection.
品質資訊生成部323生成顯示以品質測量部322所測量之接收品質之為控制資訊的品質資訊。品質資訊可使用以離散值表示接收品質之CQI(Channel Quality Indication)。品質資訊生成部323將所生成之品質資訊輸出至編碼調變部324。此外,品質資訊可為顯示各基地台之接收品質之資訊,亦可為顯示進行MBSFN發送之基地台全體之接收品質的資訊。為後者時,品質資訊生成部323亦可將對各基地台測量之接收品質統計處理,算出全體之接收品質。The quality information generating unit 323 generates quality information indicating that the reception quality measured by the quality measuring unit 322 is the control information. The quality information can use CQI (Channel Quality Indication) which indicates the reception quality in discrete values. The quality information generation unit 323 outputs the generated quality information to the code modulation unit 324. In addition, the quality information may be information indicating the reception quality of each base station, or may be information indicating the reception quality of the entire base station that performs MBSFN transmission. In the latter case, the quality information generating unit 323 may perform statistical processing on the reception quality measured by each base station to calculate the overall reception quality.
編碼調變部324將以PUSCH發送之用戶資料、MBSFN要求及品質資訊錯誤校正編碼及調變,映射至分配至行動台300之UL無線資源。編碼及調變使用預定編碼調變方式或從終端控制部317所指示之調變編碼方式。編碼調變部324將作為發送信號之基頻信號輸出至無線發送部325。The code modulation unit 324 maps the user data, the MBSFN request, the quality information error correction code, and the modulation transmitted on the PUSCH to the UL radio resource allocated to the mobile station 300. The coding and modulation are performed using a predetermined coding modulation method or a modulation coding method instructed from the terminal control unit 317. The code modulation unit 324 outputs the base frequency signal as a transmission signal to the wireless transmission unit 325.
無線發送部325將從編碼調變部324所取得之發送信號進行無線信號處理,進行從基頻信號至無線信號之增頻變頻。無線發送部325為進行無線信號處理,而具有D/A轉換器、頻率轉換器、帶通濾波器、電力放大器等之電路。The radio transmission unit 325 performs radio signal processing on the transmission signal obtained from the coding and modulation unit 324, and performs frequency-up and frequency-conversion from the baseband signal to the radio signal. The radio transmission unit 325 has a circuit such as a D/A converter, a frequency converter, a band pass filter, and a power amplifier for performing radio signal processing.
第8圖係顯示第2實施形態之發送開始控制之流程圖。將第8圖所示之控制處理按照步驟號碼來說明。Fig. 8 is a flow chart showing the transmission start control of the second embodiment. The control processing shown in Fig. 8 will be described by the step number.
(步驟S11)基地台100從行動台300接收MBSFN要求。(Step S11) The base station 100 receives the MBSFN request from the mobile station 300.
(步驟S12)發送判定部124確認連接於基地台100之行動台中在從基地台100接收MBMS資料之行動台數。(Step S12) The transmission judging unit 124 confirms the number of mobile stations that receive the MBMS data from the base station 100 among the mobile stations connected to the base station 100.
(步驟S13)發送判定部124判斷在步驟S12所確認之行動台數是否未滿預定閾值。當行動台數未滿閾值時,使處理前進至步驟S14。當為其他情形時,則使處理前進至步驟S19。(Step S13) The transmission determining unit 124 determines whether or not the number of mobile stations confirmed in step S12 is less than a predetermined threshold. When the number of mobile stations is less than the threshold, the process proceeds to step S14. When it is otherwise, the process is advanced to step S19.
(步驟S14)測量要求控制部125搜尋周邊基地台(例如與基地台100相同之MBSFN區域所含之複數個基地台)中目前在進行MBSFN發送之基地台。此外,搜尋之基地台亦可限定為在發送與行動台300所要求者相同之MBMS資料之基地台。(Step S14) The measurement request control unit 125 searches for a base station that is currently performing MBSFN transmission among the neighboring base stations (for example, a plurality of base stations included in the MBSFN area similar to the base station 100). In addition, the base station for the search may also be limited to a base station that transmits the same MBMS data as that required by the mobile station 300.
(步驟S15)測量要求控制部125判斷在進行MBSFN發送之基地台是否存在。當存在時,便使處理前進至步驟S16。當不存在時,則使處理前進至步驟S19。此時,亦可僅於在進行MBSFN發送之基地台數為2個(或者大於2之預定數)以上時,使處理前進至步驟S16,為其他情形時,則使處理前進至步驟S19。(Step S15) The measurement request control unit 125 determines whether or not the base station that performs MBSFN transmission exists. When it is present, the process is advanced to step S16. When it does not exist, the process is advanced to step S19. At this time, the process may be advanced to step S16 only when the number of base stations transmitting MBSFN is two or more (or a predetermined number greater than two), and in other cases, the process proceeds to step S19.
(步驟S16)基地台100將包含顯示在進行MBSFN發送之基地台之資訊的測量要求發送至行動台300。之後,基地台100從行動台300接收關於所通知之基地台之品質資訊。(Step S16) The base station 100 transmits a measurement request including information displayed on the base station that performs MBSFN transmission to the mobile station 300. Thereafter, the base station 100 receives quality information about the notified base station from the mobile station 300.
(步驟S17)品質判定部123判斷根據從行動台300所接收之品質資訊顯示之接收品質是否滿足基準,亦即行動台300是否為可從基地台100以外之基地台接收MBMS資料之狀態。當接收品質滿足基準時,便使處理前進至步驟S18。當為其他情形時,則使處理前進至步驟S19。(Step S17) The quality determining unit 123 determines whether or not the reception quality of the quality information display received from the mobile station 300 satisfies the criterion, that is, whether the mobile station 300 is in a state in which the MBMS data can be received from the base station other than the base station 100. When the reception quality satisfies the reference, the process proceeds to step S18. When it is otherwise, the process is advanced to step S19.
(步驟S18)基地台100通知行動台300從在進行MBSFN發送之其他基地台接收MBMS資料。此時,基地台100亦可不發送從行動台300要求之MBMS資料。(Step S18) The base station 100 notifies the mobile station 300 to receive the MBMS data from another base station that performs MBSFN transmission. At this time, the base station 100 may not transmit the MBMS data requested from the mobile station 300.
(步驟S19)基地台100進行從行動台300所要求之MBMS資料之發送。行動台300亦可從基地台100接收MBMS資料。(Step S19) The base station 100 transmits the MBMS data requested from the mobile station 300. The mobile station 300 can also receive MBMS data from the base station 100.
即,基地台100從行動台300受理MBSFN要求時,若在接收MBMS資料之轄下行動台數未滿閾值,且行動台300之接收品質為閾值以上時,便不發送所要求之MBMS資料。此外,基地台100於已發送行動台300所要求之MBMS資料時,不論行動台數為何,繼續該MBMS資料之發送亦可。In other words, when the base station 100 receives the MBSFN request from the mobile station 300, if the number of mobile stations under the control of the MBMS data is less than the threshold and the reception quality of the mobile station 300 is equal to or greater than the threshold, the required MBMS data is not transmitted. In addition, when the base station 100 has transmitted the MBMS data required by the mobile station 300, the transmission of the MBMS data may be continued regardless of the number of mobile stations.
第9圖係顯示第2實施形態之發送開绐之流程的程序圖。在此,設想基地台200在進行MBSFN發送,基地台100不發送要求之MBMS資料之情形。將第9圖所示之程序按照步驟號碼來說明。Fig. 9 is a flowchart showing the flow of the transmission and opening of the second embodiment. Here, it is assumed that the base station 200 performs MBSFN transmission, and the base station 100 does not transmit the required MBMS data. The procedure shown in Fig. 9 is explained by the step number.
(步驟S111)行動台300將MBSFN要求發送至基地台100。(Step S111) The mobile station 300 transmits the MBSFN request to the base station 100.
(步驟S112)基地台100將MBSFN要求轉送至MCE410。(Step S112) The base station 100 forwards the MBSFN request to the MCE 410.
(步驟S113)基地台100確認自身基地台之MBSFN發送之執行狀況滿足預定條件,而將測量要求發送至行動台300。測量要求含有顯示在進行MBSFN發送之基地台(至少包含基地台200)之資訊。此外,步驟S112、S113之處理亦可以相反順序進行。(Step S113) The base station 100 confirms that the execution status of the MBSFN transmission of its own base station satisfies the predetermined condition, and transmits the measurement request to the mobile station 300. The measurement request contains information displayed on the base station (including at least the base station 200) that performs MBSFN transmission. Further, the processing of steps S112 and S113 may be performed in reverse order.
(步驟S114)基地台200以DL無線訊框發送同步信號。行動台300使用所接收之同步信號,與基地台200採取同步。(Step S114) The base station 200 transmits the synchronization signal in the DL radio frame. The mobile station 300 synchronizes with the base station 200 using the received synchronization signal.
(步驟S115)基地台200以DL無線訊框發送參照信號。行動台300使用所接收之參照信號,測量關於MBSFN發送之接收品質。此外,行動台300於從基地台100通知複數個基地台時,有於各所通知之基地台進行步驟S114、S115之處理之情況。(Step S115) The base station 200 transmits the reference signal in the DL radio frame. The mobile station 300 measures the reception quality with respect to the MBSFN transmission using the received reference signal. Further, when the mobile station 300 notifies the plurality of base stations from the base station 100, the mobile station 300 may perform the processing of steps S114 and S115 at each of the notified base stations.
(步驟S116)行動台300將顯示在步驟S115所測量之關於MBSFN發送之接收品質的品質資訊發送至基地台100。(Step S116) The mobile station 300 transmits the quality information indicating the reception quality of the MBSFN transmission measured in step S115 to the base station 100.
(步驟S117)基地台100確認關於MBSFN發送之接收品質滿足預定條件,將顯示自身基地台不發送從行動台300要求之MBMS資料之MBSFN停止要求發送至MCE410。(Step S117) The base station 100 confirms that the reception quality of the MBSFN transmission satisfies the predetermined condition, and transmits an MBSFN stop request indicating that the own base station does not transmit the MBMS data requested from the mobile station 300 to the MCE 410.
(步驟S118)MCE410將為對MBSFN停止要求之回應之MBSFN停止通知發送至基地台100。(Step S118) The MCE 410 transmits an MBSFN stop notification in response to the MBSFN stop request to the base station 100.
(步驟S119)基地台100對行動台300指示從其他基地台接收MBMS資料。此外,步驟S117之MBSFN停止要求之發送與S119之處理亦可以相反順序進行。又,亦可於接收步驟S118之MBSFN停止通知前,進行步驟S119之處理。(Step S119) The base station 100 instructs the mobile station 300 to receive MBMS data from other base stations. Further, the transmission of the MBSFN stop request in step S117 and the processing of S119 may be performed in reverse order. Moreover, the process of step S119 may be performed before receiving the MBSFN stop notification in step S118.
(步驟S120)MCE410將關於行動台300所要求之MBMS資料之控制資訊(例如顯示用於該MBMS資料之發送之無線資源或調變編碼方式等之資訊)發送至包含基地台200之進行MBSFN發送的基地台。(Step S120) The MCE 410 transmits control information about the MBMS data required by the mobile station 300 (for example, information indicating a radio resource or a modulation coding method for transmission of the MBMS data) to the MBSFN transmission including the base station 200. Base station.
(步驟S121)MCE410將關於行動台300所要求之MBMS資料之控制資訊(例如顯示發送該MBMS資料之基地台等之資訊)發送至MBMS閘道520。(Step S121) The MCE 410 transmits control information (for example, information indicating a base station or the like that transmits the MBMS data) required for the MBMS data requested by the mobile station 300 to the MBMS gateway 520.
(步驟S122)MBMS閘道520將MBMS資料發送至包含基地台200之進行MBSFN發送之基地台。(Step S122) The MBMS gateway 520 transmits the MBMS data to the base station including the base station 200 for MBSFN transmission.
(步驟S123)基地台200依在步驟S120所接收之MBMS控制資訊,生成MBSFN控制信號,以MBSFN子訊框發送。(Step S123) The base station 200 generates an MBSFN control signal in accordance with the MBMS control information received in step S120, and transmits it in the MBSFN subframe.
(步驟S124)基地台200以MBSFN子訊框發送在步驟S122所接收之MBMS資料。(Step S124) The base station 200 transmits the MBMS data received in step S122 in the MBSFN subframe.
第10圖係顯示第2實施形態之發送停止控制之第1流程圖。在此,設想行動台300在從基地台100接收MBMS資料之情形。將第10圖所示之控制處理按照步驟號碼來說明。Fig. 10 is a first flowchart showing the transmission stop control of the second embodiment. Here, it is assumed that the mobile station 300 receives the MBMS data from the base station 100. The control process shown in Fig. 10 is explained by the step number.
(步驟S21)發送判定部124檢測在連接於基地台100之行動台中在從基地台100接收MBMS資料之行動台數減少。(Step S21) The transmission judging unit 124 detects that the number of mobile stations receiving the MBMS data from the base station 100 is reduced in the mobile station connected to the base station 100.
(步驟S22)發送判定部124判斷減少後之行動台數是否未滿預定閾值。當行動台數未滿閾值時,便使處理前進至步驟S23。當為其他之情形時,則結束處理。(Step S22) The transmission determining unit 124 determines whether or not the reduced number of mobile stations is less than a predetermined threshold. When the number of mobile stations is less than the threshold, the process proceeds to step S23. When it is otherwise, the process ends.
(步驟S23)測量要求控制部125搜尋在周邊基地台中目前在進行MBSFN發送之基地台。此外,搜尋之基地台亦可限定為發送與行動台300在接收者相同之MBMS資料之基地台。(Step S23) The measurement request control unit 125 searches for a base station that is currently performing MBSFN transmission in the neighboring base station. In addition, the base station for the search may also be limited to a base station that transmits the same MBMS data as the mobile station 300 at the receiver.
(步驟S24)測量要求控制部125判斷在進行MBSFN發送之基地台是否存在。當存在時,便使處理前進至步驟S5。當不存在時,則結束處理。此時,亦可以在進行MBSFN發送之基地台數為2個(或大於2之預定數)以上為條件。(Step S24) The measurement request control unit 125 determines whether or not the base station that performs MBSFN transmission exists. When it is present, the process is advanced to step S5. When it does not exist, the process ends. In this case, the number of base stations for performing MBSFN transmission may be two or more (or a predetermined number greater than two).
(步驟S25)基地台100通知行動台300從在進行MBSFN之其他基地台接收MBMS資料。(Step S25) The base station 100 notifies the mobile station 300 to receive the MBMS data from another base station that is performing the MBSFN.
(步驟S26)基地台100停止行動台300從基地台100所接收之MBMS資料之發送。(Step S26) The base station 100 stops the transmission of the MBMS data received by the mobile station 300 from the base station 100.
在上述說明中,於行動台數未滿閾值時,停止MBMS資料之發送。另一方面,如前述,亦可於行動台數未滿閾值,且行動台300之接收品質為閾值以上時,停止MBMS資料之發送。In the above description, when the number of mobile stations is less than the threshold, the transmission of the MBMS data is stopped. On the other hand, as described above, when the number of mobile stations is less than the threshold and the reception quality of the mobile station 300 is equal to or higher than the threshold, the transmission of the MBMS data may be stopped.
第11圖係顯示第2實施形態之發送停止控制之第2流程圖。在第11圖所示之處理中,於第10圖所示之控制處理之步驟S24與步驟S25間執行以下說明之步驟S24a、S24b。Fig. 11 is a second flowchart showing the transmission stop control of the second embodiment. In the processing shown in Fig. 11, the steps S24a and S24b described below are executed between step S24 and step S25 of the control processing shown in Fig. 10.
(步驟S24a)基地台100將包含顯示在進行MBSFN發送之基地台之資訊的測量要求發送至行動台300。之後,基地台100從行動台300接收關於所通知之基地台之品質資訊。(Step S24a) The base station 100 transmits a measurement request including information displayed on the base station that performs MBSFN transmission to the mobile station 300. Thereafter, the base station 100 receives quality information about the notified base station from the mobile station 300.
(步驟S24b)品質判定部123判斷根據從行動台300所接收之品質資訊顯示之接收品質是否滿足基準。當接收品質滿足基準時,使處理前進至步驟S25。當為其他之情形時,則結束處理。(Step S24b) The quality determining unit 123 determines whether or not the reception quality displayed based on the quality information received from the mobile station 300 satisfies the criterion. When the reception quality satisfies the reference, the process is advanced to step S25. When it is otherwise, the process ends.
即,基地台100當接收MBMS資料之轄下行動台數未滿閾值時,便停止MBMS資料之接收。或者,於行動台數未滿閾值,且在接收MBMS資料之行動台之接收品質為閾值以上時,停止MBMS資料之發送。此外,於複數個行動台在接收MBMS資料時,步驟S24b之發送停止與否之判斷可對複數行動台各自進行,亦可對複數個行動台全體進行。為後者時,設想以所有行動台之接收品質滿足基準為條件。That is, the base station 100 stops receiving the MBMS data when the number of mobile stations under the control of the MBMS data is less than the threshold. Alternatively, when the number of mobile stations is less than the threshold and the reception quality of the mobile station receiving the MBMS data is equal to or greater than the threshold, the transmission of the MBMS data is stopped. Further, when a plurality of mobile stations receive the MBMS data, the determination of whether the transmission of the step S24b is stopped or not may be performed for each of the plurality of mobile stations, or may be performed for all of the plurality of mobile stations. In the latter case, it is assumed that the reception quality of all the mobile stations is satisfied.
第12圖係顯示第2實施形態之發送停止之流程的程序圖。在此,設想基地台200在進行MBSFN發送,基地台100根據第11圖所示之控制處理,停止MBMS資料之發送之情形。將第12圖所示之程序按照步驟號碼來說明。Fig. 12 is a flowchart showing the flow of the transmission stop in the second embodiment. Here, it is assumed that the base station 200 performs MBSFN transmission, and the base station 100 stops the transmission of the MBMS data according to the control processing shown in FIG. The procedure shown in Fig. 12 is explained by the step number.
(步驟S131)基地台100檢測連接於自身基地台之行動台中在從基地台100接收MBMS資料之行動台數減少。(Step S131) The base station 100 detects that the number of mobile stations receiving the MBMS data from the base station 100 is reduced in the mobile station connected to the own base station.
(步驟S132)基地台100確認自身基地台之MBSFN發送之執行狀況滿足預定條件,而將測量要求發送至行動台300。測量要求含有顯示在進行MBSFN發送之基地台(至少包含基地台200)之資訊。(Step S132) The base station 100 confirms that the execution status of the MBSFN transmission of its own base station satisfies the predetermined condition, and transmits the measurement request to the mobile station 300. The measurement request contains information displayed on the base station (including at least the base station 200) that performs MBSFN transmission.
(步驟S133)基地台200以DL無線訊框發送同步信號。行動台300使用所接收之同步信號,而與基地台200採取同步。(Step S133) The base station 200 transmits the synchronization signal in the DL radio frame. The mobile station 300 synchronizes with the base station 200 using the received synchronization signal.
(步驟S134)基地台200以DL無線訊框發送參照信號。行動台300使用所接收之參照信號,測量關於MBSFN發送之接收品質。(Step S134) The base station 200 transmits the reference signal in the DL radio frame. The mobile station 300 measures the reception quality with respect to the MBSFN transmission using the received reference signal.
(步驟S135)行動台300將顯示在步驟S134所測量之關於MBSFN發送之接收品質的品質資訊發送至基地台100。(Step S135) The mobile station 300 transmits the quality information indicating the reception quality of the MBSFN transmission measured in step S134 to the base station 100.
(步驟S136)基地台100確認關於MBSFN發送之接收品質滿足預定條件,而將顯示自身基地台停止MBMS資料之發送之MBSFN停止要求發送至MCE410。(Step S136) The base station 100 confirms that the reception quality of the MBSFN transmission satisfies the predetermined condition, and transmits an MBSFN stop request indicating that the own base station stops the transmission of the MBMS data to the MCE 410.
(步驟S137)MCE410將為對MBSFN停止要求之回應之MBSFN停止通知發送至基地台100。(Step S137) The MCE 410 transmits an MBSFN stop notification in response to the MBSFN stop request to the base station 100.
(步驟S138)基地台100對行動台300指示從其他基地台接收MBMS資料。此外,步驟S136之MBSFN停止要求之發送與S138之處理亦可以相反順序進行。又,亦可於接收步驟S137之MBSFN停止通知前,進行步驟S138之處理。(Step S138) The base station 100 instructs the mobile station 300 to receive MBMS data from other base stations. Further, the transmission of the MBSFN stop request in step S136 and the processing of S138 may be performed in reverse order. Alternatively, the process of step S138 may be performed before receiving the MBSFN stop notification in step S137.
(步驟S139)MCE410將關於行動台300接收之MBMS資料之控制資訊(例如顯示用於該MBMS資料之發送之無線資源或調變編碼方式等的資訊)發送至包含基地台200之進行MBSFN發送之基地台。(Step S139) The MCE 410 transmits control information about the MBMS data received by the mobile station 300 (for example, information indicating a radio resource or a modulation coding method for transmission of the MBMS data) to the MBSFN transmission including the base station 200. Base station.
(步驟S140)MCE410將關於行動台300接收之MBMS資料之控制資訊(例如顯示發送該MBMS資料之基地台等之資訊)發送至MBMS閘道520。(Step S140) The MCE 410 transmits control information (for example, information indicating a base station or the like transmitting the MBMS data) received by the mobile station 300 to the MBMS gateway 520.
(步驟S141)MBMS閘道520將MBMS資料發送至包含基地台200之進行MBSFN發送之基地台。(Step S141) The MBMS gateway 520 transmits the MBMS data to the base station including the base station 200 for MBSFN transmission.
(步驟S142)基地台200依在步驟S139所接收之MBSFN控制資訊,生成MBSFN控制信號,以MBSFN子訊框發送。(Step S142) The base station 200 generates an MBSFN control signal in accordance with the MBSFN control information received in step S139, and transmits it in the MBSFN subframe.
(步驟S143)基地台200以MBSFN子訊框發送在步驟S141所接收之MBMS資料。(Step S143) The base station 200 transmits the MBMS data received in step S141 in the MBSFN subframe.
然而,在第9圖、第12圖所示之程序中,於基地台100不發送MBMS資料時,行動台300從基地台200接收MBSFN控制信號。但,關於行動台300要從哪個基地台接收MBSFN控制信號及MBMS資料以外之用戶資料,如以下說明,可考慮數個選擇。However, in the programs shown in FIGS. 9 and 12, when the base station 100 does not transmit the MBMS data, the mobile station 300 receives the MBSFN control signal from the base station 200. However, regarding which base station the mobile station 300 is to receive the MBSFN control signal and the user data other than the MBMS data, as described below, several options may be considered.
第13圖係顯示複數個基地台與行動台之關係的第1圖。如第13圖所示,行動台300連接於基地台100,收到來自基地台100之指示,而從基地台200接收MBMS資料。此時,關於MBSFN控制信號行動台300從基地台100接收。又,從基地台100接收MBMS資料以外之用戶資料(普通資料)。即,在第13圖之例中,行動台300一面維持與基地台100之連接,一面從基地台100以外之基地台僅接收MBMS資料。Figure 13 is a first diagram showing the relationship between a plurality of base stations and mobile stations. As shown in FIG. 13, the mobile station 300 is connected to the base station 100, receives an instruction from the base station 100, and receives MBMS data from the base station 200. At this time, the MBSFN control signal mobile station 300 is received from the base station 100. Further, the base station 100 receives user data (general data) other than the MBMS data. That is, in the example of Fig. 13, the mobile station 300 receives only the MBMS data from the base station other than the base station 100 while maintaining the connection with the base station 100.
第14圖係顯示複數個基地台與行動台之關係之第2圖。如第14圖所示,行動台300連接於基地台100,收到來自基地台100之指示,而從基地台200接收MBMS資料。此時,行動台300從基地台200也接收MBSFN控制信號。另一方面,關於MBMS資料以外之用戶資料則從基地台100接收。即,在第14圖之例中,行動台300一面維持與基地台100之連接,一面從基地台100以外之基地台僅接收MBMS資料及MBSFN控制信號。Figure 14 is a second diagram showing the relationship between a plurality of base stations and mobile stations. As shown in FIG. 14, the mobile station 300 is connected to the base station 100, receives an instruction from the base station 100, and receives MBMS data from the base station 200. At this time, the mobile station 300 also receives the MBSFN control signal from the base station 200. On the other hand, user data other than MBMS data is received from the base station 100. That is, in the example of Fig. 14, the mobile station 300 receives only the MBMS data and the MBSFN control signal from the base station other than the base station 100 while maintaining the connection with the base station 100.
第15圖係顯示複數個基地台與行動台之關係之第3圖。如第15圖所示,行動台300連接於基地台100,收到來自基地台100之指示,而從基地台200接收MBMS資料。此時,行動台300從基地台200也接收MBSFN控制信號及MBMS資料以外之用戶資料。即,在第15圖之例中,行動台300將連接目標從基地台100切換成基地台200(交遞)。交遞目標之基地台選擇在進行MBSFN發送之基地台中行動台300之接收品質最高者即可。Figure 15 is a third diagram showing the relationship between a plurality of base stations and mobile stations. As shown in Fig. 15, the mobile station 300 is connected to the base station 100, receives an instruction from the base station 100, and receives MBMS data from the base station 200. At this time, the mobile station 300 also receives the MBSFN control signal and the user data other than the MBMS data from the base station 200. That is, in the example of Fig. 15, the mobile station 300 switches the connection destination from the base station 100 to the base station 200 (handover). The base station that delivers the target selects the highest reception quality of the mobile station 300 in the base station that performs the MBSFN transmission.
根據以上說明之控制,可使存在於MBSFN區域內之基地台之一部份呈不發送MBMS資料之狀態。According to the above-described control, a part of the base station existing in the MBSFN area can be in a state in which the MBMS data is not transmitted.
第16圖係顯示MBSFN區域之例之圖。在此例中,於MBSFN區域含有細胞#1~#19。細胞#1係基地台100管理之細胞,行動台300位於細胞#1。細胞#1~#19中,細胞#2、#4、#6、#10、#14、#18發送行動台300接收之MBMS資料,其他之細胞不發送該MBMS資料。行動台300將#2、#4、#6、#10、#14、#18之無線信號合成、解調,而抽出MBMS資料。Fig. 16 is a diagram showing an example of an MBSFN area. In this example, cells #1 to #19 are contained in the MBSFN region. The cell #1 is a cell managed by the base station 100, and the mobile station 300 is located in the cell #1. In cells #1 to #19, cells #2, #4, #6, #10, #14, #18 transmit the MBMS data received by the mobile station 300, and the other cells do not transmit the MBMS data. The mobile station 300 synthesizes and demodulates the wireless signals of #2, #4, #6, #10, #14, and #18, and extracts the MBMS data.
在此,就無線資源之利用效率加以考量。如前述,因MBSFN子訊框與普通子訊框構造不同,故MBMS資料與MBMS資料以外之用戶資料不含在同一子訊框內而發送。是故,當發送之MBMS資料之量小時,於MBSFN子訊框內產生無法使用之無用無線資源,無線資源之利用效率降低。此問題可藉抑制進行MBSFN發送之基地台數而緩和。Here, consideration is given to the utilization efficiency of radio resources. As described above, since the MBSFN sub-frame is different from the normal sub-frame structure, the MBMS data and the user data other than the MBMS data are not transmitted in the same sub-frame. Therefore, when the amount of MBMS data sent is small, unnecessary radio resources that cannot be used are generated in the MBSFN subframe, and the utilization efficiency of the radio resources is lowered. This problem can be alleviated by suppressing the number of base stations that perform MBSFN transmission.
舉例言之,令進行MBSFN發送之停止控制前之狀態為在細胞#1~#19全體在發送MBSFN子訊框。然後,#2、#4、#6、#10、#14、#18存在10個接收該MBSFN子訊框之行動台,其他細胞分別存在1個接收該MBSFN子訊框之行動台。此時,該1個時序之子訊框在區域全體收容有6個細胞×10個+13個細胞×1個=73個行動台。For example, the state before the stop control of the MBSFN transmission is performed is that the cells #1 to #19 are all transmitting the MBSFN subframe. Then, #2, #4, #6, #10, #14, #18 have 10 mobile stations that receive the MBSFN subframe, and the other cells have one mobile station that receives the MBSFN subframe. At this time, the sub-frame of the one time sequence accommodates 6 cells × 10 + 13 cells × 1 = 73 mobile stations in the entire area.
另一方面,令進行上述MBSFN發送之停止控制後之狀態為在細胞#2、#4、#6、#10、#14、#18持續發送MBSFN子訊框,另一方面,在其他細胞則停止MBSFN子訊框之發送。然後,位於已停止MBSFN發送之細胞之行動台從細胞#2、#4、#6、#10、#14、#18接收MBSFN子訊框。On the other hand, the state in which the stop control of the MBSFN transmission is performed is such that the MBSFN subframe is continuously transmitted in the cells #2, #4, #6, #10, #14, and #18, and on the other hand, in other cells. Stop sending the MBSFN subframe. Then, the mobile station located in the cell that has stopped transmitting the MBSFN receives the MBSFN subframe from the cells #2, #4, #6, #10, #14, #18.
進一步,在停止MBSFN發送之細胞,發送普通子訊框而非MBSFN子訊框。普通子訊框可收容10個接收MBMS資料以外之用戶資料之行動台。此時,該1個時序之子訊框在區域全體,除了收容上述73個MBMS資料之行動台,還收容13個細胞×10個=130個行動台。在以上說明之例中,藉進行MBSFN發送之停止控制,某時序之子訊框可收容之行動台數增加至約2.8倍。Further, in the cell in which the MBSFN transmission is stopped, the normal subframe is transmitted instead of the MBSFN subframe. The normal subframe can accommodate 10 mobile stations that receive user data other than MBMS data. At this time, the sub-frame of the one sequence is in the whole area, and in addition to the action table for accommodating the above-mentioned 73 MBMS data, it also accommodates 13 cells × 10 = 130 mobile stations. In the above-described example, by performing the stop control of the MBSFN transmission, the number of mobile stations that can be accommodated in the subframe of a certain timing is increased to about 2.8 times.
此外,為更抑制進行MBSFN發送之基地台數,行動台300以可從更遠之基地台接收MBMS資料為佳。因此,可考慮進行MBSFN發送之基地台使MBSFN子訊框之發送電力增大之方法。Further, in order to further suppress the number of base stations that perform MBSFN transmission, the mobile station 300 preferably receives MBMS data from a base station that is further away. Therefore, a method in which the base station transmitting the MBSFN transmits the transmission power of the MBSFN subframe can be considered.
第17圖係顯示基地台之發送電力控制之圖。在第17圖中,子訊框#n-1、#n+1係普通子訊框,子訊框#n係MBSFN子訊框。發送該等子訊框之基地台以普通之發送電力發送子訊框#n-1、#n+1,另一方面,以高於普通之發送電力發送子訊框#n。此時,在子訊框#n-1與子訊框#n之分界、及子訊框#n與子訊框#n+1之分界,亦可使發送電力階段性地變化。藉此,比起使發送電力急遽變化之情形,更可抑制雜訊之產生。再者,藉對發送信號使用餘弦濾波器等,去除發送信號之高頻成份,亦可抑制雜訊之產生。Figure 17 is a diagram showing the transmission power control of the base station. In Fig. 17, the subframes #n-1 and #n+1 are normal subframes, and the subframe #n is an MBSFN subframe. The base station transmitting the sub-frames transmits the sub-frames #n-1, #n+1 with ordinary transmission power, and on the other hand, transmits the sub-frame #n with higher than normal transmission power. At this time, in the boundary between the sub-frame #n-1 and the sub-frame #n, and the boundary between the sub-frame #n and the sub-frame #n+1, the transmission power may be changed stepwise. Thereby, the occurrence of noise can be suppressed more than the case where the transmission power is suddenly changed. Furthermore, by using a cosine filter or the like for the transmission signal, the high-frequency component of the transmission signal is removed, and the generation of noise can be suppressed.
第18圖係顯示MBSFN區域之例之另一圖。當使MBSFN子訊框之發送電力大於普通子訊框時,從行動台300看起來似是僅在進行MBSFN發送時,周邊細胞之細胞半徑增大。藉此,行動台300可從許多基地台接收MBMS資料,而可提高接收品質。Figure 18 is another diagram showing an example of an MBSFN area. When the transmission power of the MBSFN subframe is made larger than the normal subframe, the mobile station 300 appears to increase the cell radius of the peripheral cells only when the MBSFN transmission is performed. Thereby, the mobile station 300 can receive MBMS data from many base stations, and can improve the reception quality.
根據此種第2實施形態之行動通訊系統,若基地台100呈在接收MBMS資料之轄下行動台少,轄下行動台可從其他基地台接收MBMS資料之狀態時,可停止MBSFN發送。是故,可提供進行MBSFN發送之基地台與不進行之基地台混合存在之MBSFN區域,而可謀求無線資源之利用效率之提高。又,可平穩地控制行動台300之接收處理,而可從在進行MBSFN發送之基地台接收MBMS資料。According to the mobile communication system of the second embodiment, when the base station 100 has a small number of mobile stations under the control of receiving the MBMS data, the mobile station can stop the MBSFN transmission when the mobile station can receive the MBMS data from another base station. Therefore, it is possible to provide an MBSFN area in which a base station that performs MBSFN transmission mixes with a base station that does not perform, and it is possible to improve the utilization efficiency of radio resources. Further, the reception processing of the mobile station 300 can be smoothly controlled, and the MBMS data can be received from the base station that performs the MBSFN transmission.
第3實施形態Third embodiment
接著,就第3實施形態作說明。以與前述第2實施形態之差異為中心來說明,關於同樣之事項省略說明。第3實施形態之行動通訊系統之基地台之MBSFN發送與否的判斷方法與第2實施形態不同。Next, a third embodiment will be described. The difference from the second embodiment will be mainly described, and the description of the same matters will be omitted. The method of determining whether or not the MBSFN of the base station of the mobile communication system according to the third embodiment is transmitted or not is different from that of the second embodiment.
第3實施形態之行動通訊系統可以與第2圖所示之第2實施形態相同之系統結構實現。又,第3實施形態之基地台與行動台可以與第5圖、第7圖所示之第2實施形態相同之塊結構實現。惟,使用以下說明之MBSFN發送控制部140取代MBSFN發送控制部120。The mobile communication system according to the third embodiment can be realized by the same system configuration as the second embodiment shown in Fig. 2. Further, the base station and the mobile station according to the third embodiment can be realized by the same block configuration as the second embodiment shown in Figs. 5 and 7. However, the MBSFN transmission control unit 140 is replaced with the MBSFN transmission control unit 120, which will be described below.
第19圖係顯示第3實施形態之MBSFN發送控制部之塊圖。MBSFN發送控制部140具有效率閾值記憶部141、傳送效率判定部142、品質閾值記憶部143、品質判定部144、發送判定部145及測量要求控制部146。Fig. 19 is a block diagram showing an MBSFN transmission control unit in the third embodiment. The MBSFN transmission control unit 140 includes an efficiency threshold value storage unit 141, a transmission efficiency determination unit 142, a quality threshold value storage unit 143, a quality determination unit 144, a transmission determination unit 145, and a measurement request control unit 146.
效率閾值記憶部141記憶用於基地台100是否宜停止MBSFN發送之判斷之傳送效率的閾值。傳送效率係顯示關於MBSFN發送之無線資源之利用效率的指標,舉例言之,可定義為基地台100發送之MBMS資料之總量相對於MBSFN子訊框內之無線資源之量的比例(即,MBSFN子訊框內之無線資源之使用率)。The efficiency threshold value storage unit 141 stores a threshold value for determining whether or not the base station 100 should stop the transmission efficiency of the MBSFN transmission. The transmission efficiency is an indicator indicating the utilization efficiency of the radio resources transmitted by the MBSFN, and can be defined as, for example, the ratio of the total amount of the MBMS data transmitted by the base station 100 to the amount of the radio resources in the MBSFN subframe (ie, The usage rate of wireless resources in the MBSFN sub-frame).
傳送效率判定部142當從MBSFN要求抽出部117取得MBSFN要求時,便算出基地台100發送所要求之MBMS資料時之傳送效率。然後,比較所算出之傳送效率與記憶於效率閾值記憶部141之閾值,通知發送判定部145傳送效率是否為閾值以上。又,傳送效率判定部142當檢測連接於基地台100之行動台中在接收MBMS資料之行動台之減少時,便再計算傳送效率,通知發送判定部145傳送效率是否為閾值以上。此外,各MBMS資料之資料量之資訊可從MCE410取得。When the MBSFN request is extracted from the MBSFN request extraction unit 117, the transmission efficiency determination unit 142 calculates the transmission efficiency when the base station 100 transmits the requested MBMS data. Then, the calculated transmission efficiency is compared with the threshold value stored in the efficiency threshold value storage unit 141, and the transmission determination unit 145 is notified whether or not the transmission efficiency is equal to or higher than the threshold. When the transmission efficiency determination unit 142 detects the decrease in the mobile station that receives the MBMS data in the mobile station connected to the base station 100, the transmission efficiency determination unit 142 recalculates the transmission efficiency and notifies the transmission determination unit 145 whether the transmission efficiency is equal to or higher than the threshold. In addition, information on the amount of data for each MBMS data is available from MCE410.
發送判定部145當從MBSFN要求抽出部117取得MBSFN要求時,便將MBSFN要求轉送至MCE410。又,當從傳送效率判定部142通知傳送效率未滿閾值時,便通知將測量要求發送至測量要控制部146。之後,當從品質判定部144通知接收品質為閾值以上時,對MCE410要求MBMS資料之發送停止,同時,將從其他基地台接收MBMS資料之指示通知MBSFN控制信號生成部131。When the MBSFN request extraction unit 117 acquires the MBSFN request from the MBSFN request extraction unit 117, the transmission determination unit 145 transfers the MBSFN request to the MCE 410. When the transmission efficiency determination unit 142 notifies the transmission efficiency under threshold, it notifies that the measurement request is transmitted to the measurement/determination control unit 146. After the quality determination unit 144 notifies that the reception quality is equal to or greater than the threshold value, the MCE 410 is requested to stop the transmission of the MBMS data, and the MBSFN control signal generation unit 131 is notified of the instruction to receive the MBMS data from the other base station.
又,發送判定部145因在接收MBMS資料之行動台數之減少,而從傳送效率判定部142通知傳送效率未滿閾值時,與取得MBSFN要求時同樣地控制成基地台100不發送MBMS資料。In addition, when the transmission efficiency determination unit 142 notifies the transmission efficiency under threshold value when the number of mobile stations receiving the MBMS data is reduced, the transmission determination unit 145 controls the base station 100 not to transmit the MBMS data in the same manner as when the MBSFN request is acquired.
品質閾值記憶部143、品質判定部144及測量要求控制部146之動作與MBSFN發送控制部120之品質閾值記憶部122、品質判定部123及測量要求控制部125相同。The operations of the quality threshold value storage unit 143, the quality determination unit 144, and the measurement request control unit 146 are the same as those of the quality threshold value storage unit 122, the quality determination unit 123, and the measurement request control unit 125 of the MBSFN transmission control unit 120.
第20圖係顯示第3實施形態之發送開始控制之流程圖。將第20圖所示之控制處理按照步驟號碼來說明。Fig. 20 is a flow chart showing the transmission start control of the third embodiment. The control process shown in Fig. 20 is explained by the step number.
(步驟S31)基地台100從行動台300接收MBSFN要求。(Step S31) The base station 100 receives the MBSFN request from the mobile station 300.
(步驟S32)傳送效率判定部142算出基地台100發送所要求之MBMS資料時之MBSFN子訊框的傳送效率。(Step S32) The transmission efficiency determination unit 142 calculates the transmission efficiency of the MBSFN subframe when the base station 100 transmits the requested MBMS data.
(步驟S33)傳送效率判定部142判斷在步驟S32所算出之傳送效率是否未滿預定閾值。當傳送效率未滿閾值時,使處理前進至步驟S34。當為其他之情形時,則使處理前進至步驟S39。(Step S33) The transmission efficiency determination unit 142 determines whether or not the transmission efficiency calculated in step S32 is less than a predetermined threshold. When the transfer efficiency is less than the threshold, the process is advanced to step S34. When it is otherwise, the process is advanced to step S39.
(步驟S34)測量要求控制部146搜尋周邊基地台中目前在進行MBSFN發送之基地台。(Step S34) The measurement request control unit 146 searches for a base station in the peripheral base station that is currently performing MBSFN transmission.
(步驟S35)測量要求控制部146判斷在進行MBSFN發送之基地台是否存在。當存在時,便使處理前進至步驟S36。當不存在時,則使處理前進至步驟S39。(Step S35) The measurement request control unit 146 determines whether or not the base station that performs MBSFN transmission exists. When it is present, the process is advanced to step S36. When it does not exist, the process is advanced to step S39.
(步驟S36)基地台100將包含顯示在進行MBSFN發送之基地台之資訊的測量要求發送至行動台300。之後,基地台100從行動台300接收關於所通知之基地台之品質資訊。(Step S36) The base station 100 transmits a measurement request including information displayed on the base station that performs MBSFN transmission to the mobile station 300. Thereafter, the base station 100 receives quality information about the notified base station from the mobile station 300.
(步驟S37)品質判定部144判斷根據從行動台300所接收之品質資訊顯示之接收品質是否滿足基準。當接收品質滿足基準時,便使處理前進至步驟S38。當為其他情形時,則使處理前進至步驟S39。(Step S37) The quality determining unit 144 determines whether or not the reception quality displayed based on the quality information received from the mobile station 300 satisfies the criterion. When the reception quality satisfies the reference, the process is advanced to step S38. When it is otherwise, the process is advanced to step S39.
(步驟S38)基地台100通知行動台300從在進行MBSFN發送之其他基地台接收MBMS資料。(Step S38) The base station 100 notifies the mobile station 300 to receive the MBMS data from another base station that performs MBSFN transmission.
(步驟S39)基地台100進行從行動台300要求之MBMS資料之發送。行動台300亦可從基地台100接收MBMS資料。(Step S39) The base station 100 transmits the MBMS data requested from the mobile station 300. The mobile station 300 can also receive MBMS data from the base station 100.
即,即使基地台100於從行動台300受理MBSFN要求時,若MBSFN子訊框之傳送效率未滿閾值,且行動台300之接收品質為閾值以上,便不發送所要求之MBMS資料。That is, even if the base station 100 receives the MBSFN request from the mobile station 300, if the transmission efficiency of the MBSFN subframe is less than the threshold and the reception quality of the mobile station 300 is equal to or greater than the threshold, the required MBMS data is not transmitted.
第21圖係顯示第3實施形態之發送停止控制之第1流程圖。在此,第1方法考慮不以行動台300之接收品質為閾值以上為條件之情形。將第21圖所示之控制處理按照步驟號碼來說明。Fig. 21 is a first flowchart showing the transmission stop control of the third embodiment. Here, the first method considers a case where the reception quality of the mobile station 300 is not equal to or greater than the threshold value. The control process shown in Fig. 21 is explained by the step number.
(步驟S41)傳送效率判定部142檢測在連接於基地台100之行動台中在從基地台100接收MBMS資料之行動台減少。(Step S41) The transmission efficiency determination unit 142 detects that the mobile station that receives the MBMS data from the base station 100 is reduced in the mobile station connected to the base station 100.
(步驟S42)傳送效率判定部142算出行動台數減少後之MBSFN子訊框之傳送效率。(Step S42) The transmission efficiency determination unit 142 calculates the transmission efficiency of the MBSFN subframe after the number of mobile stations is reduced.
(步驟S43)傳送效率判定部142判斷在步驟S42所算出之傳送效率是否未滿預定閾值。當傳送效率未滿閾值時,便使處理前進至步驟S44。當為其他之情形時,則結束處理。(Step S43) The transmission efficiency determination unit 142 determines whether or not the transmission efficiency calculated in step S42 is less than a predetermined threshold. When the transfer efficiency is less than the threshold, the process is advanced to step S44. When it is otherwise, the process ends.
(步驟S44)測量要求控制部146搜尋周邊基地台中目前在進行MBSFN發送之基地台。(Step S44) The measurement request control unit 146 searches for a base station in the peripheral base station that is currently performing MBSFN transmission.
(步驟S45)測量要求控制部146判斷在進行MBSFN發送之基地台是否存在。當存在時,便使處理前進至步驟S46。當不存在時,則結束處理。(Step S45) The measurement request control unit 146 determines whether or not the base station that performs MBSFN transmission exists. When it is present, the process is advanced to step S46. When it does not exist, the process ends.
(步驟S46)基地台100通知行動台300從在進行MBSFN發送之其他基地台接收MBMS資料。(Step S46) The base station 100 notifies the mobile station 300 to receive the MBMS data from another base station that performs MBSFN transmission.
(步驟S47)基地台100停止行動台300從基地台100接收之MBMS資料之發送。(Step S47) The base station 100 stops the transmission of the MBMS data received by the mobile station 300 from the base station 100.
第22圖係顯示第3實施形態之發送停止控制之第2流程圖。在此,第2方法考慮以行動台300之接收品質為閾值以上為條件之情形。在第22圖所示之控制處理中,於第21圖所示之控制處理之步驟S45與步驟S46間執行以下說明之步驟S45a、S45b。Fig. 22 is a second flowchart showing the transmission stop control of the third embodiment. Here, the second method considers a case where the reception quality of the mobile station 300 is equal to or higher than the threshold. In the control processing shown in Fig. 22, steps S45a and S45b described below are executed between step S45 and step S46 of the control processing shown in Fig. 21.
(步驟S45a)基地台100將包含顯示在進行MBSFN發送之基地台之資訊的測量要求發送至行動台300。之後,基地台100從行動台300接收關於所通知之基地台之品質資訊。(Step S45a) The base station 100 transmits a measurement request including information displayed on the base station that performs MBSFN transmission to the mobile station 300. Thereafter, the base station 100 receives quality information about the notified base station from the mobile station 300.
(步驟S45b)品質判定部144判斷根據從行動台300所接收之品質資訊顯示之接收品質是否滿足基準。當接收品質滿足基準時,使處理前進至步驟S46。當為其他之情形時,則結束處理。(Step S45b) The quality determining unit 144 determines whether or not the reception quality displayed based on the quality information received from the mobile station 300 satisfies the criterion. When the reception quality satisfies the reference, the process is advanced to step S46. When it is otherwise, the process ends.
即,基地台100當MBSFN子訊框之傳送效率未滿閾值時,便停止MBMS資料之接收。或者,於MBSFN子訊框之傳送效率未滿閾值,且在接收MBMS資料之行動台之接收品質為閾值以上時,停止MBMS資料之發送。That is, when the transmission efficiency of the MBSFN subframe is less than the threshold, the base station 100 stops the reception of the MBMS data. Alternatively, the transmission efficiency of the MBSFN subframe is less than the threshold, and when the reception quality of the mobile station receiving the MBMS data is equal to or greater than the threshold, the transmission of the MBMS data is stopped.
根據此種第2實施形態之行動通訊系統,若基地台100呈MBSFN子訊框之傳送效率低,轄下行動台可從其他基地台接收MBMS資料之狀態時,可停止MBSFN發送。是故,可提供進行MBSFN發送之基地台與不進行之基地台混合存在之MBSFN區域,而可謀求無線資源之利用效率之提高。又,可平穩地控制行動台300之接收處理,而可從在進行MBSFN發送之基地台接收MBMS資料。According to the mobile communication system of the second embodiment, when the base station 100 has a low transmission efficiency of the MBSFN subframe, the mobile station can stop the MBSFN transmission when it can receive the MBMS data from another base station. Therefore, it is possible to provide an MBSFN area in which a base station that performs MBSFN transmission mixes with a base station that does not perform, and it is possible to improve the utilization efficiency of radio resources. Further, the reception processing of the mobile station 300 can be smoothly controlled, and the MBMS data can be received from the base station that performs the MBSFN transmission.
此外,依據在接收在第2實施形態所說明之MBMS資料之行動台數的判斷方法及依據在第3實施形態所說明之傳送效率之判斷方法亦可組合使用。舉例言之,亦可於行動台數未滿閾值,且傳送效率未滿閾值時,對行動台300指示從其他基地台接收MBMS資料。Further, the determination method based on the number of mobile stations receiving the MBMS data described in the second embodiment and the determination method based on the transmission efficiency described in the third embodiment may be used in combination. For example, when the number of mobile stations is less than the threshold and the transmission efficiency is less than the threshold, the mobile station 300 is instructed to receive the MBMS data from other base stations.
第4實施形態Fourth embodiment
接著,就第4實施形態作說明。以與前述第2實施形態之差異為中心來說明,關於同樣之事項省略說明。第4實施形態之行動通訊系統中,MCE進行基地台是否進行MBSFN發送之判斷。Next, a fourth embodiment will be described. The difference from the second embodiment will be mainly described, and the description of the same matters will be omitted. In the mobile communication system according to the fourth embodiment, the MCE determines whether or not the base station performs MBSFN transmission.
第4實施形態之行動通訊系統可以與第2圖所示之第2實施形態相同之系統結構實現。又,第4實施形態之基地台與行動台可以與第5圖、第7圖所示之第2實施形態相同之塊結構實現。惟,使用以下說明之MBSFN發送控制部150取代MBSFN發送控制部120。又,使用以下說明之MCE420取代MCE410。The mobile communication system according to the fourth embodiment can be realized by the same system configuration as the second embodiment shown in Fig. 2. Further, the base station and the mobile station according to the fourth embodiment can be realized by the same block configuration as that of the second embodiment shown in Figs. 5 and 7. However, the MBSFN transmission control unit 150 is used instead of the MBSFN transmission control unit 120. Further, the MCE 420 is replaced with the MCE 420 described below.
第23圖係顯示第4實施形態之MBSFN發送控制部之塊圖。MBSFN發送控制部150具有品質資訊匯集部151、品質資訊記憶部152、MCE通訊部153及測量要求控制部154。Fig. 23 is a block diagram showing an MBSFN transmission control unit in the fourth embodiment. The MBSFN transmission control unit 150 includes a quality information collecting unit 151, a quality information storage unit 152, an MCE communication unit 153, and a measurement request control unit 154.
品質資訊匯集部151當從品質資訊抽出部114取得與MBSFN發送相關之品質資訊時,便將所取得之品質資訊儲存於品質資訊記憶部152。然後,匯集記憶於品質資訊記憶部152之品質資訊,將之輸出至MCE通訊部153。此時,當品質資訊為顯示在進行MBSFN發送之基地台各自之接收品質的資訊時,品質資訊匯集部151亦可將各接收品質統計處理,算出2個以上之基地台全體之接收品質,而將之作為所匯集之品質資訊來輸出。When the quality information collecting unit 151 acquires the quality information related to the MBSFN transmission from the quality information extracting unit 114, the quality information collecting unit 151 stores the acquired quality information in the quality information storage unit 152. Then, the quality information stored in the quality information storage unit 152 is collected and output to the MCE communication unit 153. In this case, when the quality information is the information indicating the reception quality of each of the base stations that perform the MBSFN transmission, the quality information aggregation unit 151 can calculate the reception quality of each of the two or more base stations by performing the reception quality statistical processing. It is output as the collected quality information.
品質資訊記憶部152從MBSFN要求抽出部117取得MBSFN要求,同時,從品質資訊匯集部151取得品質資訊。然後,與發送了MBSFN要求之行動台對應,記憶品質資訊。The quality information storage unit 152 acquires the MBSFN request from the MBSFN request extraction unit 117, and acquires the quality information from the quality information collection unit 151. Then, the quality information is stored in correspondence with the mobile station that has transmitted the MBSFN request.
MCE通訊部153在與MCE420間發送接收各種控制資訊。具體言之,MCE通訊部153將從MBSFN要求抽出部117所取得之MBSFN要求轉送至MCE420。當從MCE420接收測量要求時,便將之輸出至測量要求控制部154。又,將從品質資訊匯集部151所取得之品質資訊轉送至MCE420。當從MCE420接收顯示從基地台100以外之基地台接收MBMS資料之指示的控制資訊時,將該指示通知MBSFN控制信號生成部131。The MCE communication unit 153 transmits and receives various control information to and from the MCE 420. Specifically, the MCE communication unit 153 transfers the MBSFN request acquired from the MBSFN request extraction unit 117 to the MCE 420. When the measurement request is received from the MCE 420, it is output to the measurement request control section 154. Further, the quality information acquired from the quality information collecting unit 151 is transferred to the MCE 420. When the control information indicating the reception of the MBMS data from the base station other than the base station 100 is received from the MCE 420, the MBSFN control signal generating unit 131 is notified of the instruction.
測量要求控制部154當從MCE通訊部153取得測量要求時,便將在進行MBSFN發送之基地台通知測量要求生成部132。When the measurement request control unit 154 acquires the measurement request from the MCE communication unit 153, the measurement request control unit 154 notifies the measurement request generation unit 132 of the base station that performs the MBSFN transmission.
第24圖係顯示第4實施形態之MCE之塊圖。MCE420具有行動台數管理部421、品質閾值記憶部422、品質判定部423、發送判定部424、MBSFN發送控制部425及排程器426。Fig. 24 is a block diagram showing the MCE of the fourth embodiment. The MCE 420 includes a mobile station number management unit 421, a quality threshold value storage unit 422, a quality determination unit 423, a transmission determination unit 424, an MBSFN transmission control unit 425, and a scheduler 426.
行動台數管理部421對複數個基地台分別管理在連接於該基地台之行動台中在從該基地台接收MBMS資料之行動台數。The mobile station number management unit 421 manages, for a plurality of base stations, the number of mobile stations that receive MBMS data from the base station in the mobile station connected to the base station.
品質閾值記憶部422記憶用於行動台300是否可從其他基地台接收MBMS資料之判斷之接收品質的閾值。The quality threshold value storage unit 422 stores a threshold value of the reception quality for determining whether the mobile station 300 can receive the MBMS data from another base station.
品質判定部423於從基地台100接收與MBSFN發送相關之品質資訊時,比較品質資訊顯示之接收品質與記憶於品質閾值記憶部422之閾值。然後,將接收品質是否為閾值以上通知發送判定部424。When receiving the quality information related to the MBSFN transmission from the base station 100, the quality determining unit 423 compares the reception quality of the quality information display with the threshold value stored in the quality threshold value storage unit 422. Then, the transmission determination unit 424 is notified of whether or not the reception quality is equal to or greater than the threshold.
當發送判定部424從基地台100接收MBSFN要求時,比較行動台數管理部421管理之行動台數與預定閾值,當未滿閾值時,便將測量要求發送至基地台100。之後,從品質判定部423通知接收品質為閾值以上時,將MBMS資料之發送停止通知MBSFN發送控制部425。When the transmission determining unit 424 receives the MBSFN request from the base station 100, the number of mobile stations managed by the mobile station number management unit 421 is compared with a predetermined threshold, and when the threshold is not exceeded, the measurement request is transmitted to the base station 100. After the quality determination unit 423 notifies that the reception quality is equal to or greater than the threshold value, the MBSFN transmission control unit 425 is notified of the stop of the transmission of the MBMS data.
又,當發送判定部424檢測在接收MBMS資料之行動台數減少時,便比較行動台數管理部421管理之行動台數與預定閾值。當行動台數未滿閾值時,與取得MBSFN要求時同樣地將MBMS資料之發送停止通知MBSFN發送控制部425。此時,除了行動台數未滿閾值外,還可以接收品質為閾值以上為條件。Further, when the transmission determining unit 424 detects that the number of mobile stations receiving the MBMS data has decreased, the number of mobile stations managed by the mobile station number management unit 421 is compared with a predetermined threshold. When the number of mobile stations is less than the threshold value, the MBSFN transmission control unit 425 is notified of the stop of the transmission of the MBMS data in the same manner as when the MBSFN request is acquired. In this case, in addition to the number of mobile stations not exceeding the threshold, the condition that the quality is equal to or greater than the threshold may be accepted.
MBSFN發送控制部425按來自發送判定部424之通知,將MBSFN控制資訊發送至進行MBSFN發送之基地台及MBMS閘道520。舉例言之,將顯示從基地台100以外之基地台接收MBMS資料之指示的控制資訊發送至基地台100。又,將顯示用於MBMS資料之發送之無線資源或調變編碼方式的資訊發送至進行MBSN發送之基地台。又,將顯示發送MBMS資料之基地台之資訊發送至MBMS閘道520。The MBSFN transmission control unit 425 transmits the MBSFN control information to the base station that performs MBSFN transmission and the MBMS gateway 520 in response to the notification from the transmission determination unit 424. For example, control information indicating an indication of receiving MBMS data from a base station other than the base station 100 is transmitted to the base station 100. Further, information indicating a radio resource for transmission of MBMS data or a modulation coding method is transmitted to a base station that performs MBSN transmission. Further, information indicating the base station transmitting the MBMS data is transmitted to the MBMS gateway 520.
排程器426進行MBSFN發送之排程。即,選擇用於MBMS資料之發送之無線資源或調變編碼方式。又,選擇MBSFN發送之時序或用於MBSFN發送之時槽。Scheduler 426 schedules MBSFN transmissions. That is, a radio resource or a modulation coding scheme for transmission of MBMS data is selected. Also, the timing of MBSFN transmission or the time slot for MBSFN transmission is selected.
第25圖係顯示第4實施形態之發送開始之流程的程序圖。將第25圖所示之程序按照步驟號碼來說明。Fig. 25 is a flowchart showing the flow of the start of transmission in the fourth embodiment. The procedure shown in Fig. 25 is explained by the step number.
(步驟S211)行動台300將MBSFN要求發送至基地台100。(Step S211) The mobile station 300 transmits the MBSFN request to the base station 100.
(步驟S212)基地台100將MBSFN要求轉送至MCE420。(Step S212) The base station 100 forwards the MBSFN request to the MCE 420.
(步驟S213)MCE420確認基地台100之MBSFN發送之執行狀況滿足預定條件,而將測量要求發送至基地台100。(Step S213) The MCE 420 confirms that the execution status of the MBSFN transmission of the base station 100 satisfies the predetermined condition, and transmits the measurement request to the base station 100.
(步驟S214)基地台100將測量要求轉送至行動台300。(Step S214) The base station 100 forwards the measurement request to the mobile station 300.
(步驟S215)基地台200以DL無線訊框發送同步信號。行動台300使用所接收之同步信號,與基地台200採取同步。(Step S215) The base station 200 transmits the synchronization signal in the DL radio frame. The mobile station 300 synchronizes with the base station 200 using the received synchronization signal.
(步驟S216)基地台200以DL無線訊框發送參照信號。行動台300使用所接收之參照信號,測量關於MBSFN發送之接收品質。(步驟S217)行動台300將顯示在步驟S216所測量之關於MBSFN發送之接收品質的品質資訊發送至基地台100。(Step S216) The base station 200 transmits the reference signal in the DL radio frame. The mobile station 300 measures the reception quality with respect to the MBSFN transmission using the received reference signal. (Step S217) The mobile station 300 transmits the quality information indicating the reception quality of the MBSFN transmission measured in step S216 to the base station 100.
(步驟S218)基地台100將品質資訊轉送至MCE420。(Step S218) The base station 100 forwards the quality information to the MCE 420.
(步驟S219)MCE420確認根據品質資訊顯示之接收品質滿足預定條件,而將顯示基地台100不發送從行動台300所要求之MBMS資料之MBSFN停止通知發送至基地台100。(Step S219) The MCE 420 confirms that the reception quality of the quality information display satisfies the predetermined condition, and transmits the MBSFN stop notification indicating that the base station 100 does not transmit the MBMS data requested from the mobile station 300 to the base station 100.
(步驟S220)MCE420將行動台300從基地台100以外之基地台接收MBMS資料之指示發送至基地台100。(Step S220) The MCE 420 transmits an instruction to receive the MBMS data from the base station other than the base station 100 to the base station 100.
(步驟S221)基地台100將從MCE420所接收之指示轉送至行動台300。(Step S221) The base station 100 forwards the instruction received from the MCE 420 to the mobile station 300.
(步驟S222)MCE420將關於行動台300所要求之MBMS資料之控制資訊發送至包含基地台200之進行MBSFN發送之基地台。(Step S222) The MCE 420 transmits control information on the MBMS data required by the mobile station 300 to the base station including the base station 200 for MBSFN transmission.
(步驟S223)MCE420將關於行動台300所要求之MBMS資料之控制資訊發送至MBMS閘道520。(Step S223) The MCE 420 transmits control information regarding the MBMS data required by the mobile station 300 to the MBMS gateway 520.
(步驟S224)MBMS閘道520將MBMS資料發送至包含基地台200之進行MBSFN發送之基地台。(Step S224) The MBMS gateway 520 transmits the MBMS data to the base station including the base station 200 for MBSFN transmission.
(步驟S225)基地台200依在步驟S222所接收之MBSFN控制資訊,生成MBSFN控制信號,以MBSFN子訊框發送。(Step S225) The base station 200 generates an MBSFN control signal in accordance with the MBSFN control information received in step S222, and transmits it in the MBSFN subframe.
(步驟S226)基地台200以MBSFN子訊框發送在步驟S224所接收之MBMS資料。(Step S226) The base station 200 transmits the MBMS data received in step S224 in the MBSFN subframe.
第26圖係顯示第4實施形態之發送停止之流程的程序圖。將第26圖所示之程序按照步驟號碼來說明。Fig. 26 is a flowchart showing the flow of the transmission stop in the fourth embodiment. The procedure shown in Fig. 26 is explained by the step number.
(步驟S231)MCE420檢測在連接於基地台100之行動台中在從基地台100接收MBMS資料之行動台數減少。(Step S231) The MCE 420 detects that the number of mobile stations receiving the MBMS data from the base station 100 is reduced in the mobile station connected to the base station 100.
(步驟S232)MCE420確認基地台100之MBSFN發送之執行狀況滿足預定條件,而將測量要求發送至基地台100。(Step S232) The MCE 420 confirms that the execution status of the MBSFN transmission of the base station 100 satisfies the predetermined condition, and transmits the measurement request to the base station 100.
(步驟S233)基地台100將測量要求轉送至行動台300。(Step S233) The base station 100 forwards the measurement request to the mobile station 300.
以下,步驟S234~S245進行與第25圖之步驟S215~S226相同之處理。Hereinafter, steps S234 to S245 perform the same processing as steps S215 to S226 of Fig. 25.
根據此種第4實施形態之行動通訊系統,可獲得與第2實施形態相同之效果。又,在第4實施形態中,由於MCE420可統合判斷複數個基地台各自之MBSFN發送與否,故可有效率地進行判斷。According to the mobile communication system of the fourth embodiment, the same effects as those of the second embodiment can be obtained. Further, in the fourth embodiment, the MCE 420 can collectively determine whether or not the MBSFN transmission of each of the plurality of base stations is performed, so that the determination can be performed efficiently.
第5實施形態Fifth embodiment
接著,就第5實施形態作說明。以與前述第4實施形態之差異為中心來說明,關於同樣之事項則省略說明。在第5實施形態之行動通訊系統中,與第3實施形態同樣地,依傳送效率,判斷MBSFN發送與否。第5實施形態之行動通訊系統可使用與第4實施形態相同之基地台及行動台來實現。惟,在第5實施形態中,使用以下說明之MCE430取代MCE420。Next, a fifth embodiment will be described. The difference from the fourth embodiment will be mainly described, and the description of the same matters will be omitted. In the mobile communication system according to the fifth embodiment, similarly to the third embodiment, whether or not the MBSFN is transmitted or not is determined depending on the transmission efficiency. The mobile communication system according to the fifth embodiment can be realized by using the same base station and mobile station as in the fourth embodiment. However, in the fifth embodiment, the MCE 430 described below is used instead of the MCE 420.
第27圖係顯示第5實施形態之MCE之塊圖。MCE430具有效率閾值記憶部431、傳送效率判定部432、品質閾值記憶部433、品質判定部434、發送判定部435、MBSFN發送控制部436及排程器437。Figure 27 is a block diagram showing the MCE of the fifth embodiment. The MCE 430 includes an efficiency threshold value storage unit 431, a transmission efficiency determination unit 432, a quality threshold value storage unit 433, a quality determination unit 434, a transmission determination unit 435, an MBSFN transmission control unit 436, and a scheduler 437.
效率閾值記憶部431記憶傳送效率之閾值。The efficiency threshold memory unit 431 memorizes the threshold of the transmission efficiency.
當傳送效率判定部432從基地台100取得MBSFN要求時,算出基地台100發送所要求之MBMS資料時之傳送效率。然後,將所算出之傳送效率是否為記憶於效率閾值記憶部431之閾值以上通知發送判定部435。又,當傳送效率判定部432檢測在連接於基地台100之行動台中在接收MBMS資料之行動台之減少時,再計算傳送效率,將傳送效率是否為閾值以上通知發送判定部435。此外,基地台100發送之MBMS資料之總量可依從MBSFN發送控制部436及排程器437取得之資訊來界定。When the transmission efficiency determination unit 432 acquires the MBSFN request from the base station 100, it calculates the transmission efficiency when the base station 100 transmits the requested MBMS data. Then, the transmission determination unit 435 is notified whether or not the calculated transmission efficiency is equal to or greater than the threshold value stored in the efficiency threshold value storage unit 431. When the transmission efficiency determination unit 432 detects a decrease in the mobile station that receives the MBMS data in the mobile station connected to the base station 100, the transmission efficiency is recalculated, and the transmission determination unit 435 is notified whether or not the transmission efficiency is equal to or greater than the threshold value. In addition, the total amount of MBMS data transmitted by the base station 100 can be defined in accordance with information obtained by the MBSFN transmission control unit 436 and the scheduler 437.
發送判定部435於從基地台100接收MBSFN要求時,當從傳送效率判定部432被通知傳送效率未滿閾值時,便將測量要求發送至基地台100。之後,當從品質判定部434被通知接收品質為閾值以上時,便將MBMS資料之發送停止通知MBSFN發送控制部436。When the transmission determination unit 435 receives the MBSFN request from the base station 100, the transmission determination unit 435 transmits the measurement request to the base station 100 when the transmission efficiency determination unit 432 notifies that the transmission efficiency is less than the threshold value. After that, when the quality judgment unit 434 is notified that the reception quality is equal to or greater than the threshold value, the MBSFN transmission control unit 436 is notified of the stop of the transmission of the MBMS data.
又,發送判定部435因在接收MBMS資料之行動台數之減少,而從傳送效率判定部432通知基地台100之傳送效率未滿閾值時,與取得MBSFN要求時同樣地,將MBMS資料之發送停止通知MBSFN發送控制部436。此時,除了傳送效率未滿閾值外,還可以行動台300之接收品質為閾值以上為條件。Further, when the transmission efficiency determination unit 432 notifies the transmission efficiency of the base station 100 that the transmission efficiency is less than the threshold value when the number of mobile stations receiving the MBMS data is reduced, the transmission determination unit 435 transmits the MBMS data in the same manner as when the MBSFN request is acquired. The MBSFN transmission control unit 436 is notified of the stop. At this time, in addition to the fact that the transmission efficiency is less than the threshold value, the reception quality of the mobile station 300 may be equal to or greater than the threshold value.
品質閾值記憶部433、品質判定部434、MBSFN發送控制部436及排程器437之動作與MCE420之品質閾值記憶部422、品質判定部423、MBSFN發送控制部425及排程器426相同。The operations of the quality threshold value storage unit 433, the quality determination unit 434, the MBSFN transmission control unit 436, and the scheduler 437 are the same as the quality threshold value storage unit 422, the quality determination unit 423, the MBSFN transmission control unit 425, and the scheduler 426 of the MCE 420.
根據此種第5實施形態之行動通訊系統,可獲得與第3實施形態相同之效果。又,在第5實施形態中,由於MCE430可統合判斷複數個基地台各自之MBSFN發送與否,故可有效率地進行判斷。According to the mobile communication system of the fifth embodiment, the same effects as those of the third embodiment can be obtained. Further, in the fifth embodiment, the MCE 430 can collectively determine whether or not the MBSFN transmission of each of the plurality of base stations is performed, so that the determination can be performed efficiently.
第6實施形態Sixth embodiment
接著,就第6實施形態作說明。以與前述第2實施形態之差異為中心來說明,關於同樣之事項則省略說明。在第6實施形態之行動通訊系統中,行動台判定關於MBSFN發送之接收品質是否超過預定閾值。在第6實施形態中,使用以下說明之行動台300a取代行動台300。Next, a sixth embodiment will be described. The difference from the second embodiment will be mainly described, and the description of the same matters will be omitted. In the mobile communication system according to the sixth embodiment, the mobile station determines whether or not the reception quality of the MBSFN transmission exceeds a predetermined threshold. In the sixth embodiment, the mobile station 300 is replaced with the mobile station 300a described below.
第28圖係顯示第6實施形態之行動台之塊圖。行動台300a除了第7圖所示之行動台300之塊要件外,還具有品質閾值記憶部326及品質判定部327。Fig. 28 is a block diagram showing a mobile station according to the sixth embodiment. The mobile station 300a includes a quality threshold value storage unit 326 and a quality determination unit 327 in addition to the block requirements of the mobile station 300 shown in FIG.
品質閾值記憶部326記憶用於行動台300a是否可從基地台100以外之基地台接收MBMS資料之判斷的接收品質之閾值。The quality threshold value storage unit 326 stores a threshold value of the reception quality for determining whether or not the mobile station 300a can receive the MBMS data from the base station other than the base station 100.
品質判定部327從品質測量部322取得接收品質之測量結果,比較所測量之接收品質與記憶於品質閾值記憶部326之閾值。此時,當所取得之測量結果為顯示在進行MBSFN發送之基地台各自之接收品質的資訊時,統計處理各自之接收品質,算出2個以上之基地台全體之接收品質,與閾值比較。然後,生成將顯示接收品質是否為閾值以上之資訊作為與MBSFN發送相關之品質資訊。The quality determining unit 327 acquires the measurement result of the reception quality from the quality measuring unit 322, and compares the measured reception quality with the threshold value stored in the quality threshold value storage unit 326. At this time, when the obtained measurement result is the information indicating the reception quality of each of the base stations that perform the MBSFN transmission, the reception quality of each of the base stations is calculated and processed, and the reception quality of the base station is calculated and compared with the threshold. Then, information indicating whether or not the reception quality is equal to or higher than the threshold is generated as the quality information related to the MBSFN transmission.
顯示接收品質是否為閾值以上之品質資訊藉由MBSFN接收控制部316發送至基地台100。在基地台100,可依作為判定結果之品質資訊,判斷MBSFN發送之停止與否。The quality information indicating whether or not the reception quality is equal to or greater than the threshold value is transmitted to the base station 100 by the MBSFN reception control unit 316. At the base station 100, it is possible to determine whether the MBSFN transmission is stopped or not based on the quality information as a result of the determination.
根據此種第6實施形態之行動通訊系統,可獲得與第2實施形態相同之效果。又,在第6實施形態中,由於在行動台300中判定接收品質是否滿足基準,將判定結果通知基地台100,故可減輕基地台100之負荷,並且可抑制控制資訊之資訊量。According to the mobile communication system of the sixth embodiment, the same effects as those of the second embodiment can be obtained. In the sixth embodiment, the mobile station 300 determines whether or not the reception quality satisfies the criterion, and notifies the base station 100 of the determination result. Therefore, the load on the base station 100 can be reduced, and the amount of information of the control information can be suppressed.
第7實施形態Seventh embodiment
接著,就第7實施形態作說明。以與前述第2實施形態之差異為中心來說明,關於同樣之事項則省略說明。在第7實施形態之行動通訊系統中,將MCE之功能搭載於基地台,而不將MCE設作獨立之裝置。Next, a seventh embodiment will be described. The difference from the second embodiment will be mainly described, and the description of the same matters will be omitted. In the mobile communication system according to the seventh embodiment, the function of the MCE is mounted on the base station, and the MCE is not provided as an independent device.
第29圖係顯示第7實施形態之行動通訊系統之圖。第7實施形態之行動通訊系統具有包含基地台100a、200a之複數個基地台、行動台300、MME510及MBMS閘道520。Fig. 29 is a view showing the mobile communication system of the seventh embodiment. The mobile communication system according to the seventh embodiment includes a plurality of base stations including the base stations 100a and 200a, a mobile station 300, an MME 510, and an MBMS gateway 520.
存在於MBSFN區域內之複數個基地台中至少1個(例如基地台100a)具有MCE之功能、亦即控制MBSFN發送之功能。不具有MCE之功能之基地台藉由有線網路在與具有MCE功能之基地台間發送接收控制資訊,而實現MBSFN發送。At least one of the plurality of base stations (e.g., base station 100a) existing in the MBSFN area has the function of MCE, that is, the function of controlling MBSFN transmission. The base station that does not have the function of the MCE implements MBSFN transmission by transmitting and receiving control information between the base station and the MCE-capable base station through the wired network.
根據此種第7實施形態之行動通訊系統,可獲得與第2實施形態相同之效果。又,由於可不將MCE設置作個別之裝置,故可使系統結構簡略化。According to the mobile communication system of the seventh embodiment, the same effects as those of the second embodiment can be obtained. Moreover, since the MCE can be set as an individual device, the system structure can be simplified.
關於上述係僅顯示本發明之原理者。對該業者而言可進一步進行許多變形及變更,本發明非限定於上述顯示、說明之正確結構及應用例者,對應之所有變形例及均等物可視為附加之申請專利範圍及其均等物之本發明範圍。With regard to the above, only the principles of the present invention are shown. The present invention is not limited to the above-described display and description of the proper structure and application examples, and all the modifications and equivalents can be regarded as additional patent claims and their equivalents. The scope of the invention.
10,21,22,100,100a,200,200a...基地台10, 21, 22, 100, 100a, 200, 200a. . . Base station
11...通知部11. . . Notification department
12...控制部12. . . Control department
30,300,300a...行動台30,300,300a. . . Mobile station
31...發送部31. . . Sending department
32...接收部32. . . Receiving department
111,311...天線111,311. . . antenna
112,312...無線接收部112,312. . . Wireless receiving unit
113,313...解調解碼部113,313. . . Demodulation and decoding unit
114...品質資訊抽出部114. . . Quality Information Extractor
115,426,437...排程器115,426,437. . . Scheduler
116...控制資訊生成部116. . . Control information generation department
117...MBSFN要求抽出部117. . . MBSFN requires the extraction department
120,140,150,425,436...MBSFN發送控制部120,140,150,425,436. . . MBSFN transmission control unit
121,421...行動台數管理部121,421. . . Mobile Number Management Department
122,326,422...品質閾值記憶部122,326,422. . . Quality threshold memory
123,144,327,423,434...品質判定部123,144,327,423,434. . . Quality judgment department
124,145,424,435...發送判定部124,145,424,435. . . Sending judgment department
125,146,154...測量要求控制部125,146,154. . . Measurement requirements control department
131...MBSFN控制信號生成部131. . . MBSFN control signal generation unit
132...測量要求生成部132. . . Measurement request generation department
133...同步信號生成部133. . . Synchronization signal generation unit
134...RS生成部134. . . RS generation department
135...映射部135. . . Mapping department
136...編碼調變部136. . . Code modulation department
137...無線發送部137. . . Wireless transmission unit
141,431...效率閾值記憶部141,431. . . Efficiency threshold memory
142,432...傳送效率判定部142,432. . . Transmission efficiency determination unit
143,433...品質閾值記憶部143,433. . . Quality threshold memory
151...品質資訊匯集部151. . . Quality Information Collection Department
152...品質資訊記憶部152. . . Quality Information Memory
153...MCE通訊部153. . . MCE Communication Department
314...控制資訊抽出部314. . . Control information extraction department
315...MBSFN控制信號抽出部315. . . MBSFN control signal extraction unit
316...MBSFN接收控制部316. . . MBSFN receiving control unit
317...終端控制部317. . . Terminal control department
318...MBSFN要求生成部318. . . MBSFN Requirements Generation Department
319...同步信號抽出部319. . . Synchronization signal extraction unit
320...同步控制部320. . . Synchronous control unit
321...RS抽出部321. . . RS extraction department
322...品質測量部322. . . Quality measurement department
323...品質資訊生成部323. . . Quality Information Generation Department
324...編碼調變部324. . . Code modulation department
325...無線發送部325. . . Wireless transmission unit
410,420,430...MCE410,420,430. . . MCE
510...MME510. . . MME
520...MBMS閘道520. . . MBMS gateway
S1-S4,S11-S19,S21-S26,S24a,S24b,S31-S39,S41-S47,S45a,S45b,S111-S124,S131-S143,S211-S226,S231-S245...步驟S1-S4, S11-S19, S21-S26, S24a, S24b, S31-S39, S41-S47, S45a, S45b, S111-S124, S131-S143, S211-S226, S231-S245. . . step
#0-#9...子訊框(第3圖)#0-#9. . . Child frame (Figure 3)
#n-1,#n+1...普通子訊框#n-1,#n+1. . . Ordinary subframe
#n...MBSFN子訊框#n. . . MBSFN subframe
#1-#19...細胞(第16圖)#1-#19. . . Cells (Figure 16)
第1圖係顯示第1實施形態之行動通訊系統之圖。Fig. 1 is a view showing a mobile communication system according to the first embodiment.
第2圖係顯示第2實施形態之行動通訊系統之圖。Fig. 2 is a view showing the mobile communication system of the second embodiment.
第3圖係顯示無線訊框之構造例之圖。Fig. 3 is a view showing a configuration example of a radio frame.
第4圖係顯示標準CP及長CP之例之圖。Fig. 4 is a diagram showing an example of a standard CP and a long CP.
第5圖係顯示第2實施形態之基地台之塊圖。Fig. 5 is a block diagram showing a base station of the second embodiment.
第6圖係顯示第2實施形態之MBSFN發送控制部之塊圖。Fig. 6 is a block diagram showing an MBSFN transmission control unit according to the second embodiment.
第7圖係顯示第2實施形態之行動台之塊圖。Fig. 7 is a block diagram showing a mobile station according to the second embodiment.
第8圖係顯示第2實施形態之發送開始控制之流程圖。Fig. 8 is a flow chart showing the transmission start control of the second embodiment.
第9圖係顯示第2實施形態之發送開始之流程的程序圖。Fig. 9 is a flowchart showing the flow of the start of transmission in the second embodiment.
第10圖係顯示第2實施形態之發送停止控制之第1流程圖。Fig. 10 is a first flowchart showing the transmission stop control of the second embodiment.
第11圖係顯示第2實施形態之發送停止控制之第2流程圖。Fig. 11 is a second flowchart showing the transmission stop control of the second embodiment.
第12圖係顯示第2實施形態之發送停止之流程的程序圖。Fig. 12 is a flowchart showing the flow of the transmission stop in the second embodiment.
第13圖係顯示複數個基地台與行動台之關係之第1圖。Figure 13 is a first diagram showing the relationship between a plurality of base stations and mobile stations.
第14圖係顯示複數個基地台與行動台之關係之第2圖。Figure 14 is a second diagram showing the relationship between a plurality of base stations and mobile stations.
第15圖係顯示複數個基地台與行動台之關係之第3圖。Figure 15 is a third diagram showing the relationship between a plurality of base stations and mobile stations.
第16圖係顯示MBSFN區域之例之圖。Fig. 16 is a diagram showing an example of an MBSFN area.
第17圖係顯示基地台之發送電力控制之圖。Figure 17 is a diagram showing the transmission power control of the base station.
第18圖係顯示MBSFN區域之例之另一圖。Figure 18 is another diagram showing an example of an MBSFN area.
第19圖係顯示第3實施形態之MBSFN發送控制部之塊圖。Fig. 19 is a block diagram showing an MBSFN transmission control unit in the third embodiment.
第20圖係顯示第3實施形態之發送開始控制之流程圖。Fig. 20 is a flow chart showing the transmission start control of the third embodiment.
第21圖係顯示第3實施形態之發送停止控制之第1流程圖。Fig. 21 is a first flowchart showing the transmission stop control of the third embodiment.
第22圖係顯示第3實施形態之發送停止控制之第2流程圖。Fig. 22 is a second flowchart showing the transmission stop control of the third embodiment.
第23圖係顯示第4實施形態之MBSFN發送控制部之塊圖。Fig. 23 is a block diagram showing an MBSFN transmission control unit in the fourth embodiment.
第24圖係顯示第4實施形態之MCE之塊圖。Fig. 24 is a block diagram showing the MCE of the fourth embodiment.
第25圖係顯示第4實施形態之發送開始之流程的程序圖。Fig. 25 is a flowchart showing the flow of the start of transmission in the fourth embodiment.
第26圖係顯示第4實施形態之發送停止之流程的程序圖。Fig. 26 is a flowchart showing the flow of the transmission stop in the fourth embodiment.
第27圖係顯示第5實施形態之MCE之塊圖。Figure 27 is a block diagram showing the MCE of the fifth embodiment.
第28圖係顯示第6實施形態之行動台之塊圖。Fig. 28 is a block diagram showing a mobile station according to the sixth embodiment.
第29圖係顯示第7實施形態之行動通訊系統之圖。Fig. 29 is a view showing the mobile communication system of the seventh embodiment.
10,21,22...基地台10,21,22. . . Base station
11...通知部11. . . Notification department
12...控制部12. . . Control department
30...行動台30. . . Mobile station
31...發送部31. . . Sending department
32...接收部32. . . Receiving department
S1-S4...步驟S1-S4. . . step
Claims (39)
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