TWI517621B - Mobile communication system, base station, mobile station and radio communication method - Google Patents

Description

Mobile communication system, base station, mobile station, and wireless communication method Field of invention

This case is about mobile communication systems, base stations, mobile stations and wireless communication methods.

Background of the invention

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.

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.

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.

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).

Advanced technical literature Patent literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2009-188612

Patent Document 2: International Publication No. 2008/038336

Patent Document 3: International Publication No. 2007/148911

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.

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.

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.

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.

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.

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.

The above and other objects, features, and advantages of the invention will be apparent from the description of the appended claims appended claims

Simple illustration

Fig. 1 is a view showing a mobile communication system according to the first embodiment.

Fig. 2 is a view showing the mobile communication system of the second embodiment.

Fig. 3 is a view showing a configuration example of a radio frame.

Fig. 4 is a diagram showing an example of a standard CP and a long CP.

Fig. 5 is a block diagram showing a base station of the second embodiment.

Fig. 6 is a block diagram showing an MBSFN transmission control unit according to the second embodiment.

Fig. 7 is a block diagram showing a mobile station according to the second embodiment.

Fig. 8 is a flow chart showing the transmission start control of the second embodiment.

Fig. 9 is a flowchart showing the flow of the start of transmission in the second embodiment.

Fig. 10 is a first flowchart showing the transmission stop control of the second embodiment.

Fig. 11 is a second flowchart showing the transmission stop control of the second embodiment.

Fig. 12 is a flowchart showing the flow of the transmission stop in the second embodiment.

Figure 13 is a first diagram showing the relationship between a plurality of base stations and mobile stations.

Figure 14 is a second diagram showing the relationship between a plurality of base stations and mobile stations.

Figure 15 is a third diagram showing the relationship between a plurality of base stations and mobile stations.

Fig. 16 is a diagram showing an example of an MBSFN area.

Figure 17 is a diagram showing the transmission power control of the base station.

Figure 18 is another diagram showing an example of an MBSFN area.

Fig. 19 is a block diagram showing an MBSFN transmission control unit in the third embodiment.

Fig. 20 is a flow chart showing the transmission start control of the third embodiment.

Fig. 21 is a first flowchart showing the transmission stop control of the third embodiment.

Fig. 22 is a second flowchart showing the transmission stop control of the third embodiment.

Fig. 23 is a block diagram showing an MBSFN transmission control unit in the fourth embodiment.

Fig. 24 is a block diagram showing the MCE of the fourth embodiment.

Fig. 25 is a flowchart showing the flow of the start of transmission in the fourth embodiment.

Fig. 26 is a flowchart showing the flow of the transmission stop in the fourth embodiment.

Figure 27 is a block diagram showing the MCE of the fifth embodiment.

Fig. 28 is a block diagram showing a mobile station according to the sixth embodiment.

Fig. 29 is a view showing the mobile communication system of the seventh embodiment.

Form for implementing the invention

Hereinafter, the present embodiment will be described in detail with reference to the drawings.

First embodiment

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.

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.

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.

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.

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).

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.

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.

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.

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.

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.

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.

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.

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.

Second embodiment

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. .

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.

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.

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.

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.

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.

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).

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

(Step S11) The base station 100 receives the MBSFN request from the mobile station 300.

(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.

(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.

(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.

(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.

(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.

(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.

(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.

(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.

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.

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.

(Step S111) The mobile station 300 transmits the MBSFN request to the base station 100.

(Step S112) The base station 100 forwards the MBSFN request to the MCE 410.

(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.

(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.

(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.

(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.

(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.

(Step S118) The MCE 410 transmits an MBSFN stop notification in response to the MBSFN stop request to the base station 100.

(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.

(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.

(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.

(Step S122) The MBMS gateway 520 transmits the MBMS data to the base station including the base station 200 for MBSFN transmission.

(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.

(Step S124) The base station 200 transmits the MBMS data received in step S122 in the MBSFN subframe.

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.

(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.

(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.

(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.

(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).

(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.

(Step S26) The base station 100 stops the transmission of the MBMS data received by the mobile station 300 from the base station 100.

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.

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.

(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.

(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.

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.

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.

(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.

(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.

(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.

(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.

(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.

(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.

(Step S137) The MCE 410 transmits an MBSFN stop notification in response to the MBSFN stop request to the base station 100.

(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.

(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.

(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.

(Step S141) The MBMS gateway 520 transmits the MBMS data to the base station including the base station 200 for MBSFN transmission.

(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.

(Step S143) The base station 200 transmits the MBMS data received in step S141 in the MBSFN subframe.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Third embodiment

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.

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.

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.

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).

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.

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.

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.

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.

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.

(Step S31) The base station 100 receives the MBSFN request from the mobile station 300.

(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.

(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.

(Step S34) The measurement request control unit 146 searches for a base station in the peripheral base station that is currently performing MBSFN transmission.

(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.

(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.

(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.

(Step S38) The base station 100 notifies the mobile station 300 to receive the MBMS data from another base station that performs MBSFN transmission.

(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.

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.

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.

(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.

(Step S42) The transmission efficiency determination unit 142 calculates the transmission efficiency of the MBSFN subframe after the number of mobile stations is reduced.

(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.

(Step S44) The measurement request control unit 146 searches for a base station in the peripheral base station that is currently performing MBSFN transmission.

(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.

(Step S46) The base station 100 notifies the mobile station 300 to receive the MBMS data from another base station that performs MBSFN transmission.

(Step S47) The base station 100 stops the transmission of the MBMS data received by the mobile station 300 from the base station 100.

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.

(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.

(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.

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.

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.

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.

Fourth embodiment

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

(Step S211) The mobile station 300 transmits the MBSFN request to the base station 100.

(Step S212) The base station 100 forwards the MBSFN request to the MCE 420.

(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.

(Step S214) The base station 100 forwards the measurement request to the mobile station 300.

(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.

(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.

(Step S218) The base station 100 forwards the quality information to the MCE 420.

(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.

(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.

(Step S221) The base station 100 forwards the instruction received from the MCE 420 to the mobile station 300.

(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.

(Step S223) The MCE 420 transmits control information regarding the MBMS data required by the mobile station 300 to the MBMS gateway 520.

(Step S224) The MBMS gateway 520 transmits the MBMS data to the base station including the base station 200 for MBSFN transmission.

(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.

(Step S226) The base station 200 transmits the MBMS data received in step S224 in the MBSFN subframe.

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.

(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.

(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.

(Step S233) The base station 100 forwards the measurement request to the mobile station 300.

Hereinafter, steps S234 to S245 perform the same processing as steps S215 to S226 of Fig. 25.

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.

Fifth embodiment

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.

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.

The efficiency threshold memory unit 431 memorizes the threshold of the transmission efficiency.

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.

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.

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.

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.

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.

Sixth embodiment

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.

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.

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.

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.

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.

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.

Seventh embodiment

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.

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.

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.

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.

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. . . Base station

11. . . Notification department

12. . . Control department

30,300,300a. . . Mobile station

31. . . Sending department

32. . . Receiving department

111,311. . . antenna

112,312. . . Wireless receiving unit

113,313. . . Demodulation and decoding unit

114. . . Quality Information Extractor

115,426,437. . . Scheduler

116. . . Control information generation department

117. . . MBSFN requires the extraction department

120,140,150,425,436. . . MBSFN transmission control unit

121,421. . . Mobile Number Management Department

122,326,422. . . Quality threshold memory

123,144,327,423,434. . . Quality judgment department

124,145,424,435. . . Sending judgment department

125,146,154. . . Measurement requirements control department

131. . . MBSFN control signal generation unit

132. . . Measurement request generation department

133. . . Synchronization signal generation unit

134. . . RS generation department

135. . . Mapping department

136. . . Code modulation department

137. . . Wireless transmission unit

141,431. . . Efficiency threshold memory

142,432. . . Transmission efficiency determination unit

143,433. . . Quality threshold memory

151. . . Quality Information Collection Department

152. . . Quality Information Memory

153. . . MCE Communication Department

314. . . Control information extraction department

315. . . MBSFN control signal extraction unit

316. . . MBSFN receiving control unit

317. . . Terminal control department

318. . . MBSFN Requirements Generation Department

319. . . Synchronization signal extraction unit

320. . . Synchronous control unit

321. . . RS extraction department

322. . . Quality measurement department

323. . . Quality Information Generation Department

324. . . Code modulation department

325. . . Wireless transmission unit

410,420,430. . . MCE

510. . . MME

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. . . step

#0-#9. . . Child frame (Figure 3)

#n-1,#n+1. . . Ordinary subframe

#n. . . MBSFN subframe

#1-#19. . . Cells (Figure 16)

Fig. 1 is a view showing a mobile communication system according to the first embodiment.

Fig. 2 is a view showing the mobile communication system of the second embodiment.

Fig. 3 is a view showing a configuration example of a radio frame.

Fig. 4 is a diagram showing an example of a standard CP and a long CP.

Fig. 5 is a block diagram showing a base station of the second embodiment.

Fig. 6 is a block diagram showing an MBSFN transmission control unit according to the second embodiment.

Fig. 7 is a block diagram showing a mobile station according to the second embodiment.

Fig. 8 is a flow chart showing the transmission start control of the second embodiment.

Fig. 9 is a flowchart showing the flow of the start of transmission in the second embodiment.

Fig. 10 is a first flowchart showing the transmission stop control of the second embodiment.

Fig. 11 is a second flowchart showing the transmission stop control of the second embodiment.

Fig. 12 is a flowchart showing the flow of the transmission stop in the second embodiment.

Figure 13 is a first diagram showing the relationship between a plurality of base stations and mobile stations.

Figure 14 is a second diagram showing the relationship between a plurality of base stations and mobile stations.

Figure 15 is a third diagram showing the relationship between a plurality of base stations and mobile stations.

Fig. 16 is a diagram showing an example of an MBSFN area.

Figure 17 is a diagram showing the transmission power control of the base station.

Figure 18 is another diagram showing an example of an MBSFN area.

Fig. 19 is a block diagram showing an MBSFN transmission control unit in the third embodiment.

Fig. 20 is a flow chart showing the transmission start control of the third embodiment.

Fig. 21 is a first flowchart showing the transmission stop control of the third embodiment.

Fig. 22 is a second flowchart showing the transmission stop control of the third embodiment.

Fig. 23 is a block diagram showing an MBSFN transmission control unit in the fourth embodiment.

Fig. 24 is a block diagram showing the MCE of the fourth embodiment.

Fig. 25 is a flowchart showing the flow of the start of transmission in the fourth embodiment.

Fig. 26 is a flowchart showing the flow of the transmission stop in the fourth embodiment.

Figure 27 is a block diagram showing the MCE of the fifth embodiment.

Fig. 28 is a block diagram showing a mobile station according to the sixth embodiment.

Fig. 29 is a view showing the mobile communication system of the seventh embodiment.

10,21,22. . . Base station

11. . . Notification department

12. . . Control department

30. . . Mobile station

31. . . Sending department

32. . . Receiving department

S1-S4. . . step

Claims (39)

A mobile communication system includes a plurality of base stations, and the base station of the plurality of base stations notifying the same content at the same time sequence, wherein the base station includes a notification unit and a control The notification unit notifies one or more mobile stations of information on the other base stations in which the same content is reported in the plurality of base stations and is common to the mobile station, and the control unit performs one or more actions on the one or more actions. The station instructs the other base station to receive the same content and the information common to the mobile station; and the mobile station includes a transmitting unit and a receiving unit, and the transmitting unit displays the other information notified from the base station. The information on the reception status of the radio signal of the base station is transmitted to the base station, and the receiving unit performs the reception of the same content and the information common to the mobile station from the other base station in accordance with an instruction from the base station. The mobile communication system of claim 1, wherein the control unit receives information indicating a reception quality of a wireless signal from the other base station in the mobile station. The mobile communication system according to claim 1, wherein the control unit instructs the one or more mobile stations to perform from the other base station in accordance with information indicating a reception quality of a wireless signal from the other base station in the mobile station. Reception of the same content as described above. The mobile communication system of claim 1, wherein the control unit instructs to notify the same from the other base stations When the data shared by the mobile station is received, it is controlled that the base station does not transmit the same content. The mobile communication system according to claim 1, wherein the receiving unit receives, from the base station, data other than the information common to the other base station and shared by the mobile station. The mobile communication system according to claim 1, wherein the receiving unit receives, from the base station, a control signal for receiving, by the other base station, the same content that is reported and shared by the mobile station. The mobile communication system of claim 1, wherein the notification unit notifies the action regarding the information of the other base station in accordance with the transmission status of the information shared by the base station and the information common to the mobile station. station. For example, in the mobile communication system of claim 7, wherein the information of the same content can be used by the number of mobile stations, and the mobile station receives the plurality of mobile stations connected to the base station including the mobile station. In the mobile station that reports the same content and is common to the mobile station, the notification unit notifies the mobile station of the information about the other base station when the number of the mobile stations is less than a predetermined threshold. For example, in the mobile communication system of the seventh application patent scope, the information of the same content and common to the mobile station can use the same amount of information and the information common to the mobile station from the base station and can be used for notification. The transmission efficiency calculated by the amount of radio resources of the same content and the information common to the mobile station, the notification unit is as described above. When the transmission efficiency is less than the predetermined threshold, the information about the other base stations is notified to the mobile station. The mobile communication system of claim 1, wherein the notification unit receives, from the mobile station, the same content of the same content that has been notified and is common to the mobile station, and the information about the other base stations is Notify the above one or more mobile stations. The mobile communication system of claim 1, wherein the notification unit receives a reduction of a mobile station including a plurality of mobile stations connected to the base station and receiving the same content and common to the mobile station; The above-mentioned mobile station will be notified of the information about the other base stations mentioned above. The mobile communication system of claim 1, wherein the control unit instructs to perform the same content from the other base station and is common to the mobile station when the reception quality indicated by the information indicating the reception status satisfies a predetermined condition. Reception of data. For example, in the mobile communication system of claim 1, wherein the other base stations respectively notify or transmit the same content and common information and other information shared by the mobile station in time sharing, the mobile station further has a measuring department, and the measuring unit. The reception quality of the wireless signal in the section in which the other data is transmitted is measured as the reception status for each of the other base stations. For example, in the mobile communication system of claim 1, wherein the other base stations respectively report or transmit the same information and other information common to the mobile station in time sharing, the mobile station has more measurement. In the section, the measurement unit measures the reception quality of the signal of the wireless signal from the other base station in the section informing the data of the same content as the reception status. A base station is used for a mobile communication system including a plurality of base stations and two or more base stations of the plurality of base stations notifying the same content at the same time sequence, and is characterized in that: the notification unit has Notifying one or more mobile station information of the other base stations in the plurality of base stations that report the same content and common to the mobile station; and the control unit receives and displays the wireless signals from the other base stations in the mobile station Receiving the quality information, and instructing the mobile station to receive the same content from the other base stations and the information common to the mobile station. The base station of claim 15, wherein the control unit instructs the one or more mobile stations to perform from the other base station according to information indicating a reception quality of a wireless signal from the other base station in the mobile station. The receipt of the same content and common information on the mobile station. A mobile station for use in a mobile communication system including a plurality of base stations and two or more base stations of the plurality of base stations notifying the same content at the same time sequence, and having a receiving unit from the foregoing The first base station of the plurality of base stations receives information on the second base station that reports the same content and is common to the mobile station, and follows the instructions from the first base station. The second base station receives the same content and shares the information on the mobile station. The mobile station of claim 17 has a transmitting unit that transmits information indicating a reception state of the wireless signal to the second base station of the plurality of base stations, wherein the wireless signal is from the same content as the notification. The first base station among the two or more base stations of the data. A wireless communication method is a wireless communication method for a mobile communication system including a plurality of base stations and two or more base stations of the plurality of base stations notifying the same content at the same time, the wireless communication method is characterized by The first base station of the plurality of base stations will notify one or more mobile stations of the information of the second base station that reports the same content and is common to the mobile station in the plurality of base stations, and the mobile station will display the information from the mobile station. Notifying that the wireless signal of the second base station transmits information of the reception status of the mobile station to the first base station, and the first base station instructs the one or more mobile stations to perform the same from the second base station Content and reception of information common to the mobile station. The wireless communication method according to claim 19, wherein the second base station instructs the one or more mobile stations from the information on the basis of information indicating the reception quality of the wireless signal from the second base station in the mobile station. 2 The base station performs the reception of the same content as described above. A mobile communication system comprising a plurality of cells, wherein two or more cells of the plurality of cells notify the same content at the same time, and the method includes: a base station, and a notification unit and a control unit The notification unit notifies one or more mobile stations of information on the other cells of the plurality of cells that report the same content and is common to the mobile station, and the control unit instructs the one or more mobile stations. The other cells perform the same content and receive the data common to the mobile station; and the mobile station includes a transmitting unit and a receiving unit, and the transmitting unit displays the wireless signals from the other cells notified by the base station. The information of the reception status is transmitted to the base station, and the receiving unit receives the information of the same content and common to the mobile station from the other cells in accordance with an instruction from the base station. The mobile communication system according to claim 21, wherein the control unit instructs the one or more mobile stations to perform the same from the other cells in accordance with information indicating a reception quality of a wireless signal from the other cells in the mobile station. Content and reception of information common to the mobile station. The mobile communication system of claim 21, wherein the control unit instructs the base station not to perform the same content when the control unit instructs reception of the same content and the information common to the mobile station from the other cells. The transmission of the information. Such as the mobile communication system of claim 21, wherein the aforementioned receiving The department receives information from the base station other than the information common to the other cells notified by the aforementioned cells and common to the mobile station. The mobile communication system according to claim 21, wherein the receiving unit receives, from the base station, a control signal for receiving the same content that is notified from the other cells and is received by the mobile station. The mobile communication system of claim 21, wherein the notification unit notifies the mobile station of information about the other cells based on the same content of the same content notified from the base station and shared by the mobile station. . For example, in the mobile communication system of claim 26, wherein the information of the same content and common to the mobile station can be received by the plurality of mobile stations including the mobile station connected to the base station, and the same content is received and acted upon. When the number of the mobile stations is less than the predetermined threshold, the notification unit notifies the mobile station of the information about the other cells. For example, in the mobile communication system of claim 26, the information of the same content and common to the mobile station can use the same content sent from the foregoing base station and the amount of data common to the mobile station can be used for sending. In the transmission efficiency calculated by the amount of radio resources of the data shared by the mobile station, the notification unit notifies the mobile station of the information about the other cells when the transmission efficiency is less than a predetermined threshold. Such as the mobile communication system of claim 21, wherein the aforementioned notice The department receives the above-mentioned mobile station from the mobile station and transmits a request for the information common to the mobile station, and notifies the mobile station of the information about the other cells. The mobile communication system of claim 21, wherein the notification unit receives a reduction of a mobile station including a plurality of mobile stations connected to the base station and receiving the same content and common to the mobile station; The above-mentioned mobile station will be notified of information about the other cells mentioned above. The mobile communication system of claim 21, wherein the control unit instructs the other cells to perform the same content and is common to the mobile station when the reception quality indicated by the information indicating the reception status satisfies a predetermined condition. Reception. For example, in the mobile communication system of claim 21, wherein the other cells respectively notify or transmit the same content and common information on the mobile station in time sharing, the mobile station further has a measuring unit, and the measuring unit is The reception quality of the wireless signal in the section in which the other data is transmitted is measured as the reception state for each of the other cells. For example, in the mobile communication system of claim 21, wherein the other cells respectively notify or transmit the same content and common information on the mobile station in time sharing, the mobile station further has a measuring unit, and the measuring unit is The reception quality of the signal of the wireless signal from the other cells synthesized in the section in which the same content is transmitted and shared by the mobile station is measured as the reception condition. A base station for use in a mobile communication system including a plurality of cells and in which two or more cells of the plurality of cells notify the same content at the same time sequence, and has a notification unit, which is related to the foregoing Notifying one or more mobile station information of the other cells of the same content and transmitting the data common to the mobile station in the plurality of cells; and the control unit instructing the one or more mobile stations to perform the foregoing from the other cells Reception of the same content and common information on the mobile station. The base station of claim 34, wherein the control unit is notified and received by the mobile station, and displays information on the reception status of the wireless signal from the notified other cells in the mobile station. One or more mobile stations instruct the reception of the same information from the other cells described above and shared by the mobile station. A mobile station for use in a mobile communication system including a plurality of cells and two or more cells of the plurality of cells reporting the same content at the same time, and having a receiving unit from the plurality of The base station of the first cell in the cell receives information on the second cell in which the information of the same content in the plurality of cells is shared by the mobile station, and the instruction from the first cell is from the foregoing The second cell receives the same content as described above and is common to the mobile station. A mobile station according to claim 36, wherein the mobile station has a transmitting unit that transmits information indicating a reception state of the wireless signal to the second cell in the plurality of cells, the wireless signal being from the notification of the same The first cell of the above two or more cells of the content data. A wireless communication method is a wireless communication method including a mobile communication system in which a plurality of cells and two or more cells of the plurality of cells notify the same content at the same time, the wireless communication method is characterized by the plurality of The base station of the first cell in the cell will notify one or more mobile stations of information on the second cell in which the same content of the above-mentioned plurality of cells is reported and is common to the mobile station, and the mobile station will display the notification from the mobile station. The wireless signal of the second cell is transmitted to the base station in the reception status of the mobile station, and the base station instructs the one or more mobile stations to perform the same content from the second cell and is common to the mobile station. Reception of data. The wireless communication method according to claim 38, wherein the base station of the first cell indicates the one or more mobile stations from the foregoing by displaying information on the reception quality of the wireless signal from the second cell in the mobile station. The second cell receives the data of the same content as described above.