WO2010034233A1

WO2010034233A1 - Method, system and device for transmitting multimedia broadcast multicast service

Info

Publication number: WO2010034233A1
Application number: PCT/CN2009/074080
Authority: WO
Inventors: 林亚男; 丁昱; 索士强; 肖国军; 潘学明
Original assignee: 大唐移动通信设备有限公司
Priority date: 2008-09-28
Filing date: 2009-09-21
Publication date: 2010-04-01

Abstract

A method for transmitting multimedia broadcast multicast service (MBMS) is provided. The method includes the following steps: the base station transmits the MBMS service to the terminals in the downlink service sub-frames; the base station receives the feedback information transmitted from the terminals in the uplink service sub-frames, wherein the ratio of the uplink service sub-frames to the downlink service sub-frames is less than one. A system and a device for transmitting MBMS are also provided. The present invention can provide high-speed downlink MBMS service to users, make full use of the downlink resources of the system, and avoid resource waste due to the idle downlink sub-frames. Moreover, the uplink feedback scheme is adopted, which can improve the overall performance of the system, enrich the service types, bring convenience to the operation and management, and help to optimize the system performance further.

Description

Multimedia broadcast multicast service MBMS transmission method, system and device

The present invention relates to the field of mobile communications, and in particular to the field of MBMS technology for mobile communications. Background technique

In order to effectively utilize mobile communication network resources, 3GPP (3rd Generation Partnership Project) proposes MBMS (Multimedia Broadcast Multicast Service) of mobile communication network, so as to be in the mobile communication network. Provides a point-to-multipoint service in which data sources send data to multiple users, sharing network resources, especially the sharing of air interface resources, and improving the utilization of network resources.

The MBMS proposed by the 3GPP can not only realize plain text low-rate message-like multicast and broadcast, but also realize multicast and broadcast of high-speed multimedia services, which undoubtedly conforms to the trend of future mobile data development. In order to further improve the transmission performance of the MBMS, in the LTE (Long Term Evolution) system of the 3GPP, various situations supporting the MBMS service are defined, for example, the transmission method includes hybrid carrier transmission and dedicated carrier transmission, and The LTE system also supports frequency division duplexing and time division duplexing, and the two duplexing modes use different frame structures. For a time division duplex system, each radio frame is composed of 10 ls long subframes, and each subframe is numbered sequentially from 0 to 9. Table 1 shows the transport formats for the various configurations supported by the system.

Table 1 Upper and lower frame configuration

In Table 1, "D" indicates that the subframe is used for downlink transmission, "U" indicates that the subframe is used for uplink transmission, and "S" indicates special subframe, including: "DwPTS", "GP", "UpPTS" The three areas, where DwPTS is used to transmit the downlink primary synchronization signal and the normal downlink service data, the GP is the protection interval, and the UpPTS occupies 1~2 OFDM symbols to transmit the uplink random access signal and the uplink detection signal.

The main features of the MBMS service are large data volume, strong real-time performance, and wide coverage. In LTE time-division duplex systems, OFDM modulation is used for MBMS transmission. For downlink MBMS services, the sub-carrier spacing is 7.5 kHz. The ability to resist time domain interference is strong, but the ability to resolve multipath is poor, that is, the ability to resist frequency domain interference is poor. When MBMS is transmitted through a dedicated carrier, the delay between multipaths is larger than that of ordinary data services. The terminal can easily distinguish the signals on each path, so it can be used without affecting its anti-interference performance in the frequency domain. The subcarrier spacing of 7.5 kHz can better resist time domain interference and improve the overall performance of the system.

The traditional MBMS service is usually a one-way transmission service based on the broadcast multicast of the following lines. Since there is no feedback function, the sender usually does not know the specific situation of the receiver. In addition, for the characteristics of the mobile communication system itself, when there are a large number of downlink resources in some systems, There are a small number of configurations of uplink resources.

Therefore, it is necessary to propose an MBMS transmission mechanism with uplink feedback function. Summary of the invention

The present invention proposes an MBMS transmission method, system and device to solve the problem that feedback cannot be realized in the MBMS service.

To achieve the above objective, the present invention discloses an MBMS transmission method, which can fully utilize the downlink resources in the system, provide high-speed downlink multimedia broadcast services to users, and can implement uplink feedback of user terminals, thereby improving the overall system. performance.

The invention discloses an MBMS transmission method, which comprises the following steps:

The base station sends an MBMS service to the terminal in a downlink service subframe of the dedicated carrier; the base station receives feedback information from the terminal in an uplink service subframe of the dedicated carrier. The invention also discloses an MBMS transmission system, comprising:

a base station, where the base station sends an MBMS service to the terminal;

The terminal receives the MBMS service sent by the base station, and sends feedback information to the base station in an uplink channel.

The invention also discloses an MBMS transmission device, comprising:

a configuration module, where the configuration module is configured to select an appropriate transmission parameter, send the MBMS service on the carrier resource, and receive feedback information of the terminal on the carrier resource; Sending an MBMS service to the terminal;

a receiving module, where the receiving module is configured to receive feedback information of the terminal.

The invention also discloses a terminal device, comprising:

a terminal receiving module, configured to receive an MBMS service and a system parameter sent by the base station, and a terminal sending module, where the sending module is configured to send the feedback information to the base station.

Since the conventional MBMS transmission is usually a one-way broadcast multicast transmission service and lacks a feedback mechanism, the present invention proposes an MBMS transmission method, system and device with a feedback mechanism according to the characteristics of the mobile communication system itself. The technical solution of the present invention has the following advantages: the high-speed downlink multimedia broadcast service can be provided to the user, and the downlink resources in the system are fully utilized to avoid waste of resources caused by idle downlink subframes. In addition, an upstream feedback mechanism is introduced, It can also improve the overall performance of the system, enrich the type of business, and bring convenience to operations management, which is beneficial to further optimize system performance.

According to the feedback period T, the terminal repeatedly sends the feedback information to the base station in the period T, and the base station improves the receiving performance by receiving the diversity, and solves the existence of the uplink feedback channel and the downlink in the system.

MBMS transport channel coverage mismatch problem.

By selecting a larger subcarrier spacing for feedback information, the frequency domain interference of the system is reduced, and the overall performance of the system is improved. DRAWINGS

Figure 1 is a flow chart of the MBMS transmission method;

2 is a schematic diagram of physical resources of MBMS transmission with feedback; FIG. 4 is a schematic diagram of a reference symbol mapping structure used for uplink feedback;

Figure 5 is a flowchart of step S102 in the MBMS transmission method;

Figure 6 is a schematic diagram of repeated feedback;

Figure 7 is a flowchart of step S102 in the MBMS transmission method;

8 is a schematic diagram of a feedback system transceiver device for MBMS transmission;

Figure 9 is a schematic diagram showing the functional structure of an MBMS transmission device;

10 is a schematic diagram showing the functional structure of an MBMS feedback terminal device;

FIG. 11 is a schematic diagram showing the functional structure of another MBMS feedback terminal device. detailed description

The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings and embodiments. The MBMS transmission method disclosed in the present invention includes the following steps:

The base station sends the MBMS service and system parameters to the terminal, and the base station receives the feedback information sent by the terminal.

As shown in Fig. 1, a flow chart for implementing the MBMS transmission method of the present invention.

S101. The base station sends the MBMS service and system parameters.

The main features of the MBMS service are large data volume, strong real-time performance, and wide coverage. As Embodiments of the present invention, the present invention will be described in detail below by way of an MBMS service example in an LTE system. In the LTE system, an extended CP (Cycle Prefix) is always used for MBMS transmission, and the transmission bandwidth occupies the entire frequency band. The LTE system supports two MBMS transmission methods: hybrid carrier transmission and dedicated carrier transmission. In the case of hybrid carrier transmission, MBMS and non-MBMS/unicast services exist simultaneously in a certain time band, and the subcarrier spacing is 15 kHz. When dedicated carrier transmission, only MBMS service exists in a certain time band, and the subcarrier spacing is present. It is 7.5 kHz.

As an embodiment of the present invention, the downlink transmission resource that the base station sends information to the terminal is greater than the uplink transmission resource that the terminal sends information to the base station. At this time, there are a large number of downlink resources in the system, and there are also a small amount of uplink resources. Therefore, the MBMS transmission mechanism with uplink feedback function can be implemented with a small amount of uplink resources.

As an embodiment of the present invention, the uplink and downlink communication between the base station and the terminal is a time division duplex mode, and the base station sends an MBMS service to the terminal in a downlink service subframe; the base station receives feedback information sent by the terminal in the uplink service subframe, where The ratio of the uplink service subframe to the downlink service subframe is less than 1. The ratio of the uplink service subframe to the downlink service subframe may also be various conditions as shown in Table 1. Preferably, the ratio of the uplink and downlink service subframes is 1:9. Under this condition, all downlink service subframes are used for MBMS transmission.

As an embodiment of the present invention, the base station transmits an MBMS service to the terminal on a dedicated carrier, and all downlink service subframes of the dedicated carrier are used for MBMS transmission.

Correspondingly, the terminal sends feedback information to the base station on the dedicated carrier, and all uplink service subframes in the dedicated carrier are used to transmit feedback information.

In the above embodiment, the system can work independently without other carrier cooperation, that is, in the dedicated carrier frequency band, including: synchronization channel, MBMS control channel, MBMS paging channel, random access channel, etc., each channel can be used Work in a standard defined way, or be designed separately.

As an embodiment of the present invention, the uplink feedback of the terminal may use less than or equal to the bandwidth resource used by the downlink MBMS transmission. When the uplink feedback bandwidth is smaller than the downlink MBMS transmission bandwidth, the remaining frequency resources in the uplink service subframe may be used by other systems. Preferably, the terminal selects an appropriate uplink bandwidth resource for transmission and transmission according to the size of the information to be fed back. As shown in Table 1, the LTE system currently supports MBMS transmission in multiple modes. Not general, with configuration 5 (ie, the ratio of uplink to downlink is 1: 9).

2 is a schematic diagram of physical resources of MBMS transmission with feedback. The system bandwidth is 5 MHz, and all the downlink service subframes always transmit the MBMS service with full bandwidth, and the uplink feedback subframe occupies the ^^ MHz bandwidth for transmission, where ^ ^< , that is, the bandwidth occupied by the uplink feedback is smaller than the downlink MBMS transmission. The bandwidth used.

Preferably, in the system, the secondary synchronization channel occupies the intermediate 1.4M frequency band of the last OFDM symbol in subframe 0 and subframe 5, and the remaining resources on the symbol no longer carry the MBMS service. The primary synchronization signal occupies 1.4M of the third OFDM symbol in subframe 1 and subframe 6, and the other resources on the symbol no longer carry the MBMS service. The MBMS control channel and paging channel are fixedly placed in the DwPTS for transmission. The random access channel is placed in the UpPTS for transmission.

In the LTE system, two different subcarrier spacings are specified: 15 kHz and 7.5 kHz, of which 7.5 kHz is only used for MBMS dedicated carrier transmission. Under different conditions, the parameters in each physical resource block with a time domain length of 1 ms and a frequency domain width of 180 kHz are shown in Table 2 below.

Table 2 Configuration parameters

The subcarrier spacing of the downlink MBMS transmission is 7.5 kHz, which is mapped according to the reference symbol structure shown in FIG. The subcarrier spacing of the uplink transmission is 15 kHz. For the conventional CP and the extended CP, the reference symbol structure shown in FIG. 4 is mapped. The reference symbol used by the receiving end for channel estimation, that is, the pilot symbol, is used for MBMS transmission.

S102. The base station receives feedback information from the terminal.

After receiving the MBMS service, the terminal sends the feedback information required by the system to the base station in the appropriate uplink bandwidth resource, and the base station receives the feedback information in the corresponding uplink carrier. For example, through the resource block of the U portion of Figure 2. As an embodiment of the present invention, the feedback information of the terminal includes:

Feedback information for link adaptation, for example: channel quality information required for adaptive modulation coding, HARQ (Hybrid Automatic Repeat reQuest) retransmission indication information, and precoding matrix information;

Feedback information based on MBMS service content, such as: user's vote, user's message, etc.; feedback information required for operation management, such as: authentication information, user satisfaction survey information, and billing statistics.

There is usually a difference between the uplink transmission and the downlink transmission. For example, in the case of a time division duplex system using MBMS dedicated carrier transmission, a large number of downlink subframes are used for dedicated carrier MBMS transmission, and the uplink resources are used to feed back the control signaling required for the MBMS service. However, due to the small amount of data of the uplink feedback signaling and the limited capability of the terminal, the processing powers such as the coding gain and the transmission mode of the uplink transmission are worse than the downlink transmission. Therefore, the uplink feedback channel and the downlink MBMS transmission channel exist in the system. Overwrite issues such as mismatch.

Therefore, in an embodiment in accordance with the present invention, as shown in FIG. 5, the following steps may be included in step S102:

S102A1: The base station sends the MBMS service and system parameters to the terminal.

S102B1: The terminal periodically receives feedback information sent by the base station, where the feedback information is sent by the terminal according to a feedback period in the system parameter.

The base station receives feedback information from the terminal in the period T according to the feedback period T indicated by the system parameter.

The base station sends the MBMS service and system parameters to the terminal. The system parameters include related parameters necessary for the system to run, and related parameters indicating the MBMS transmission mechanism with uplink feedback function, such as a feedback period.

In the above embodiment, the uplink and downlink communication is a time division duplex mode, and the uplink and downlink service sub-frames are configured as a 1:9 mode transmission format. The present invention will be described in detail below in conjunction with the transmission configuration of the system.

Under the condition that the uplink and downlink service subframes are configured in the 1:9 mode transmission format, it is 10 ms—a radio frame, including 0 to 9 total 10 subframes, wherein the second subframe is an uplink transmission subframe.

As an embodiment of the present invention, as shown in FIG. 6, according to the indication of the system parameter, the feedback period T is a radio frame, where Ν is a natural number. In this embodiment, the feedback period Τ is specifically N times 10 ms. In the period T, the base station repeatedly receives the mx N times of feedback information sent by the terminal, where m is the number of subframes used for uplink transmission in each radio frame.

As shown in Figure 6, the feedback information N x 10ms generates an information source, which is processed by encoding, modulation, etc. to form a complex signal. The terminal repeatedly transmits m x N times of feedback information in the period T, where m is the number of subframes used for uplink transmission in each radio frame, that is, the feedback information sent each time occupies an uplink service subframe for transmission. In this embodiment, since the feedback information is small, each uplink service subframe carries complete feedback information.

The base station performs an uplink feedback information detection within the transmission time interval T of each uplink feedback, and combines the feedback information of the first M transmissions in one T, where M is less than or equal to m x N. Through the above operations, the base station improves the receiving performance by receiving diversity, and solves the problem that the uplink feedback channel does not match the downlink MBMS transmission channel coverage in the system. The size of M is chosen according to the requirements of system performance. Obviously, the closer M is to m, the better the performance of the feedback information received by the base station.

In another embodiment in accordance with the present invention, as shown in FIG. 7, step S102 includes the following steps:

S102A2: The base station sends the MBMS service and system parameters to the terminal.

S102B2: The base station receives feedback information from the terminal, and the feedback information is sent at an appropriate subcarrier interval selected by the terminal.

After receiving the MBMS service, the terminal selects to send the feedback information required by the system to the base station in the appropriate uplink bandwidth resource.

In the above embodiment, when the subcarrier spacing of the downlink transmission is 7.5 kHz, the capability of resisting time domain interference is strong, but the resolution of multipath is poor, that is, the ability to resist frequency domain interference is poor. Since the delay of multipath between the dedicated carrier MBMS is larger than that of the normal data service, the terminal can easily distinguish the signals on each path, so the subcarrier spacing of 7.5 kHz can be used without affecting the frequency domain. Under the premise of interference performance, it is better to combat time domain interference and improve the overall performance of the system.

However, for the uplink feedback signal, the delay between the multipath signals received by the same base station from the same terminal is small, so a larger subcarrier spacing is needed to ensure the frequency domain anti-interference performance of the system. As an embodiment of the present invention, the terminal selects a subcarrier spacing equal to or greater than 7.5 kHz to transmit feedback information to the base station, for example, a subcarrier spacing of 15 kHz or a subcarrier spacing of several times 7.5 kHz.

The invention also provides an MBMS transmission system, comprising:

The base station, the base station sends an MBMS service and system parameters to the terminal; the terminal receives the MBMS service and system parameters sent by the base station, and sends feedback information to the base station in the uplink channel.

Preferably, the terminal may determine the feedback period T according to the system parameters, and send feedback information to the base station in the period T in the uplink channel.

Preferably, the base station sends an MBMS service to the terminal, where the MBMS service is transmitted in an OFDM modulation manner, and the OFDM modulated subcarrier spacing is F; the terminal receives the MBMS service sent by the base station, and selects equal to or greater than the uplink channel. The subcarrier spacing of F sends feedback information to the base station.

As shown in FIG. 8, in this embodiment, the base station 810 transmits the subcarrier spacing of the MBMS service to 7.5 kHz, and the uplink channel selects the subcarrier feedback information of 15 kHz to the terminal 820. In this embodiment, since the sampling rates of the uplink and downlink transmissions are different, the frequencies used by the transceivers are also different. For the base station 810, a 7.5 kHz transmitter and a 15 kHz receiver are required, and the terminal 820 needs to be configured with a 15 kHz transmitter and a 7.5 kHz receiver.

As shown in FIG. 9, the present invention further discloses an MBMS transmission device 900, including: a sending module 910, a sending module 910, configured to send an MBMS service to the terminal 1000; a configuration module 920, where the configuration module 920 is configured to select a suitable carrier resource. Transmitting the MBMS service on the carrier resource, and receiving the feedback information of the terminal 1000 on the carrier resource;

The receiving module 930 is configured to receive feedback information of the terminal.

As an embodiment of the above device, the configuration module 920 includes:

The downlink transmission configuration module 921, the downlink transmission configuration module 921 is configured to select, according to the system parameter, a transmission parameter for sending the MBMS service;

The uplink feedback configuration module 922 is configured to select, according to system parameters, a transmission parameter and a feedback information type required by the terminal 1000 to send feedback information.

The system parameters include, for example, the uplink and downlink frame transmission formats shown in Table 1, including the system. The duplex mode of work also includes various information that the system needs to feedback from the terminal, including the transmission parameters required by the terminal to send feedback information.

As an embodiment of the present invention, the downlink transmission configuration module 921 selects a transmission parameter for transmitting the MBMS service, including: a subcarrier spacing of the downlink MBMS transmission.

As an embodiment of the present invention, the uplink feedback configuration module 922 selects the transmission parameters required by the terminal 1000 to transmit: a regular CP or an extended CP, and the feedback information type includes link adaptive feedback information, management operation information, and feedback based on MBMS service content. information.

As shown in FIG. 10, the present invention also discloses a terminal device 1000, including:

The terminal receiving module 1030 is configured to receive the MBMS service and system parameters sent by the base station;

The terminal sending module 1010 is configured to send feedback information to the base station. The terminal setting module 1020 is configured to set a feedback period T according to the system parameters obtained by the receiving module, and send feedback information in the period T. The sending module 1010 sends the signal to the base station.

As an embodiment of the foregoing device, where the feedback period T is N radio frames, where N is a natural number, the terminal sending module 1010 repeatedly transmits mx N times of feedback information to the base station in the period T, where m is used in each radio frame. The number of subframes transmitted in the uplink.

As shown in FIG. 11, the present invention also discloses another terminal device 1000, including:

a terminal sending module 1110, the terminal sending module 1110 is configured to send feedback information to the base station; a terminal configuration module 1120, the terminal configuration module 1120 is configured to select a subcarrier spacing for transmitting feedback information, and select a subcarrier spacing equal to or greater than F through the terminal sending module. 1110 is sent to the base station;

The terminal receiving module 1130 is configured to receive the MBMS service sent by the base station, where the MBMS service is sent in an OFDM modulation manner, and the subcarrier spacing of the OFDM modulation is F.

As an embodiment of the present invention, the subcarrier spacing of the OFDM modulation received by the terminal receiving module 1130 is 7.5 kHz, and the subcarrier spacing of 15 kHz selected by the terminal configuration module 1120 transmits the feedback information to the base station through the terminal sending module 1110. Obviously, the terminal configuration module 1120 can also send feedback information to the base station at a subcarrier interval of several times 7.5 kHz. In the embodiment of the present invention, the feedback information sent by the terminal sending module 1110 includes: link adaptation feedback information, management operation information, and feedback information based on MBMS service content.

The link adaptive feedback information includes: channel quality information used for adaptive modulation coding, HARQ (Hybrid Automatic Repeat reQuest), and precoding matrix information.

The feedback information based on the business content includes: a user's vote, a user's message, and the like.

The feedback information required for operation management includes: authentication information, user satisfaction survey information, and billing statistics.

The technical solution of the present invention has the following advantages:

1. The high-speed downlink multimedia broadcast service can be provided to the user, and the downlink resources in the system are fully utilized to avoid waste of resources caused by idle downlink subframes.

2. Introducing the uplink feedback mechanism can also improve the overall performance of the system, enrich the service type, and bring convenience to the operation management, which is beneficial to further optimize system performance.

3. According to the feedback period T, the terminal repeatedly sends the feedback information to the base station in the period T, and the base station improves the receiving performance by receiving the diversity, and solves the problem that the uplink feedback channel and the downlink MBMS transmission channel coverage do not match in the system.

4. By selecting a larger subcarrier spacing for feedback information, reducing the frequency domain interference of the system and improving the overall performance of the system.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

Claim

A multimedia broadcast multicast service MBMS transmission method, characterized in that the following steps are included:

The base station transmits an MBMS service to the terminal in a downlink service subframe of the dedicated carrier; the base station receives feedback information from the terminal in an uplink service subframe of the dedicated carrier.

The MBMS transmission method according to claim 1, wherein the uplink and downlink communication between the base station and the terminal is a time division duplex mode, and the uplink service subframe and the downlink service subframe are The ratio is less than 1.

3. The MBMS transmission method according to claim 2, wherein all downlink traffic subframes in the dedicated carrier are configured for MBMS transmission.

The MBMS transmission method according to claim 3, wherein the base station receives feedback information from the terminal on the dedicated carrier, and all uplink service subframes in the dedicated carrier are configured for Transfer feedback information.

The MBMS transmission method according to claim 3, wherein the ratio of the upper service subframe to the downlink service subframe includes 1:9.

The MBMS transmission method according to claim 3, wherein the dedicated carrier includes a synchronization channel, an MBMS control channel, an MBMS paging channel, and a random access channel.

The MBMS transmission method according to claim 3, wherein the base station receives the feedback information sent by the terminal on the uplink bandwidth resource, and the uplink bandwidth resource is selected according to the size of the information to be fed back.

8. The MBMS transmission method according to claim 1, wherein the feedback information comprises link adaptation feedback information.

The MBMS transmission method according to claim 8, wherein the link adaptation feedback information comprises: channel quality information, retransmission indication information, and precoding matrix information of the MBMS service received by the terminal.

10. The MBMS transmission method according to claim 1, wherein said feedback signal Information includes managing operational information.

The MBMS transmission method according to claim 10, wherein the management operation information comprises: authentication information of the terminal, user satisfaction survey information, and billing statistics information.

12. The MBMS transmission method according to claim 1, wherein the feedback information comprises feedback information based on MBMS service content.

The MBMS transmission method according to any one of claims 1 to 12, characterized in that:

The base station sends an MBMS service and system parameters to the terminal;

The base station receives feedback information transmitted by the terminal within a feedback period T indicated by the system parameters.

The MBMS transmission method according to claim 13, wherein the feedback period T is N radio frames, and the N is a natural number.

The MBMS transmission method according to claim 14, wherein, in the period T, the base station repeatedly receives mx N times of feedback information sent by the terminal, where m is used for uplink in each radio frame. The number of subframes transmitted.

The MBMS service is transmitted in an OFDM modulation manner, and the subcarrier spacing of the OFDM modulation is F;

The base station receives feedback information from the terminal at subcarrier intervals equal to or greater than F.

The MBMS transmission method according to claim 16, wherein the subcarrier spacing F used by the MBMS transmission comprises 15 kHz and 7.5 kHz.

The MBMS transmission method according to claim 16, wherein the subcarrier spacing used for transmitting the feedback information is one or more times the subcarrier spacing of 7.5 kHz.

The MBMS transmission method according to claim 16, wherein the subcarrier spacing used for transmitting the feedback information comprises 15 kHz.

20. An MBMS transmission system, comprising: a base station, where the base station sends an MBMS service to the terminal;

The MBMS transmission system according to claim 20, wherein the terminal receives the MBMS service and system parameters sent by the base station, determines a feedback period T according to the system parameter, and performs the period T in the uplink channel. Feedback information is sent to the base station.

22. The MBMS transmission system of claim 20, wherein:

The base station transmits the MBMS service in an OFDM modulation manner, where the subcarrier spacing of the OFDM modulation is F;

The terminal transmits the feedback information to the base station using a subcarrier spacing equal to or greater than F in the uplink channel.

23. An MBMS transmission device, comprising:

a configuration module, where the configuration module is configured to select an appropriate transmission parameter, send an MBMS service on the carrier resource, and receive feedback information from the terminal on the carrier resource; and send a module, where the sending module is used to The terminal sends the MBMS service; and the receiving module is configured to receive feedback information from the terminal.

The MBMS transmission device according to claim 23, wherein the configuration module comprises:

a downlink transmission configuration module, where the downlink transmission configuration module is configured to select, according to system parameters, a transmission parameter that sends the MBMS service;

And an uplink feedback configuration module, where the uplink feedback configuration module is configured to select, according to the system parameter, a transmission parameter and a feedback information type required by the terminal to send the feedback information.

The MBMS transmission device according to claim 24, wherein the downlink transmission configuration module selects a transmission parameter for transmitting the MBMS service, and includes: a subcarrier spacing for downlink MBMS transmission.

The MBMS transmission device according to claim 24, wherein the transmission parameter comprises a regular CP or an extended CP, and the feedback information type includes link adaptation feedback information, management operation information, and content based on MBMS service content. Feedback.

27. A terminal device, comprising: The terminal receiving module is configured to receive the MBMS service and the system parameter sent by the base station, and the terminal sending module, where the terminal sending module is configured to send the feedback information to the base station.

The terminal device according to claim 27, further comprising:

a terminal setting module, configured to set a feedback period T according to the system parameter obtained by the receiving module, and send the feedback information to the base station in the period T through the sending module.

The terminal device according to claim 28, wherein the feedback period T is N radio frames, where N is a natural number, and the sending module repeatedly transmits mx N times to the base station in the period T. Feedback information, where m is the number of subframes used for uplink transmission in each radio frame.

The terminal device according to claim 27, further comprising:

a terminal configuration module, where the configuration module is configured to select a subcarrier interval for transmitting the feedback information, and select a subcarrier interval equal to or greater than F to send to the base station by using the sending module.

The terminal device according to claim 30, wherein the OFDM modulated subcarrier spacing received by the receiving module is 7.5 kHz, and the 15 kHz subcarrier spacing selected by the configuration module passes the feedback information The transmitting module sends the base station to the base station.

The terminal device according to claim 31, wherein the feedback information sent by the sending module comprises:

Link adaptive feedback information, management operation information, and feedback information based on MBMS service content.