CN101098175A - Method for transmitting, receiving evolvement multimedia broadcast multicast business - Google Patents
Method for transmitting, receiving evolvement multimedia broadcast multicast business Download PDFInfo
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Abstract
The invention discloses a sending-receiving method of advanced multimedia broadcast multicast service, wherein when in sending, decomposing the object multimedia broadcast multicast service into basic layer data and strengthen layer data, using different multi-in multi-out MIMO technique to send the basic and strengthen layer data respectively, and transmitting the indication information of the basic and strengthen layer data on a control channel, when in receiving, terminal obtains the indication information sent from base station, and only receiving and demodulating basic layer data or only receiving and demodulating basic layer data and strengthen layer data according to self ability. Via the invention, the terminals with different abilities under various single-frequency network topology structures can effectively receive advanced multimedia broadcast multicast service.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method for transmitting and receiving an evolution multimedia broadcast multicast service.
Background
Now, the demand for mobile communication is no longer satisfied with the telephone and message services, and with the rapid development of the internet, a large number of mobile multimedia services are emerging. Some of these mobile multimedia services require that multiple users receive the same data simultaneously, such as video-on-demand, television broadcasting, video conferencing, online education, interactive games, etc. Compared with general data services, the mobile multimedia services have the characteristics of large data volume, long duration, sensitive time delay and the like.
In order to effectively utilize the resources of the mobile communication network, 3GPP (third generation global standardization organization for mobile communication) has proposed an MBMS (multimedia broadcast multicast service) service of the mobile communication network, thereby providing a point-to-multipoint service in which one data source sends data to a plurality of users in the mobile communication network, implementing network resource sharing, and improving the utilization rate of the network resources, especially the utilization rate of air interface resources. The MBMS proposed by 3GPP includes not only the pure-text low-rate message-like multicast and broadcast but also the multicast and broadcast of high-speed multimedia services.
In LTE (Long Term Evolution ) for E-MBMS (evolved multimedia broadcast multicast service), 3GPP is currently under discussion to implement transmission of broadcast data by using MIMO (Multiple Input, Multiple Output) transmission technology. Potential possible candidate schemes are a MIMO scheme for transmit diversity, a MIMO scheme for spatial multiplexing, and a MIMO scheme for hybrid transmit diversity and spatial multiplexing. Wherein,
1. the MIMO scheme for transmit diversity is mainly aimed at adopting a 2 × 1 antenna configuration, i.e., the base station uses two antennas for transmission and one antenna for reception at the terminal. The contents of data streams sent to two antennas by a sending end are completely the same, and the transmission sequence of the data streams on each antenna is adjusted by utilizing various space-time coding methods; since the receiving terminal has only one receiving link, the two data streams received simultaneously must be made transparent by a certain signal processing, i.e. only one data stream is finally seen with respect to the terminal. The existing transmission diversity schemes mainly include two SFBC (space frequency block coding) and CDD (cyclic delay coding).
2. The MIMO scheme of spatial multiplexing mainly aims at adopting a 2 × 2 antenna configuration, i.e., both base station transmission and terminal reception use two antennas. The contents of data streams sent to the two antennas by the sending end are different; the terminal has two antennas, i.e. two receiving chains, and is capable of demodulating two different data streams separately through certain signal processing. The current spatial multiplexing mode has a multiplexing mode of single code words and multiple code words from the content of each data stream; the space arrangement order is mainly divided into HBLAST (horizontally layered space-time structure), VBLAST (vertically layered space-time structure) and DBLAST (diagonally layered space-time structure).
3. The MIMO scheme of hybrid transmit diversity and spatial multiplexing is mainly aimed at using a 4 × 2 antenna configuration, i.e. a base station has four antennas for transmission and a terminal has two antennas for reception. The four antennas are divided into two groups by the sending end, and each group comprises two antennas. The MIMO technology of spatial multiplexing is adopted among the groups, and the MIMO technology of transmit diversity is adopted in the groups; the processing methods received by the terminal correspond to the processing methods of 1 and 2, respectively.
From the trend of 3GPP E-MBMS evolution, SFN (single frequency network) will be a commonly adopted network structure, that is, all base stations in the SFN network transmit the same MBMS service at the same time using the same frequency resource, so that users can receive useful signals from different base stations even at the cell edge. The terminal can not only perform energy combination on the received useful signals, but also obtain diversity gains from different paths, thereby improving the QoS (quality of service) of the MBMS service in the whole SFN area range.
The above three MIMO schemes all have certain requirements on antenna configuration, and are only for network deployment and terminals of different levels in some cases: scheme 1 mainly aims at that under the condition that an SFN network is sparse, useful signal energy received by different paths is weak, and a terminal object is mainly a low end (one receiving antenna and one receiving link are weak in processing capacity); schemes 2 and 3 mainly aim at that in the case of a dense SFN network, the energy of useful signals received by different paths is strong, the target of the terminal is mainly a high-end (two receiving antennas and a receiving link, the processing capability is strong), and the base station has two or four transmitting antennas and transmitting links. Therefore, the applications of these three MIMO schemes are limited to some extent.
Disclosure of Invention
The invention mainly aims to provide a method for sending an evolution multimedia broadcast multicast service, which overcomes the defect that the existing E-MBMS sending technology is limited by terminal capability and network deployment conditions and ensures the transmission of the MBMS service under various SFN network topological structures.
Another object of the present invention is to provide a receiving method of an evolved multimedia broadcast multicast service so that terminals with different capabilities can effectively receive an MBMS service.
Therefore, the invention provides the following technical scheme:
a method for transmitting evolved multimedia broadcast multicast service, the method comprising the steps of:
A. decomposing the multimedia broadcast multicast service into base layer level data and enhancement layer level data;
B. transmitting the base layer level data and the enhancement layer level data by adopting different Multiple Input Multiple Output (MIMO) technologies respectively;
C. indication information of the base layer level data and the enhancement layer level data is transmitted on a control channel.
The step B comprises the following steps:
transmitting the base layer level data by adopting the MIMO technology of transmit diversity;
and transmitting the enhancement layer level data by adopting a spatial multiplexing MIMO technology.
The step B further comprises the following steps:
respectively carrying out different pre-coding on the base layer level data and the enhancement layer level data;
and mapping the precoded base layer grade data and the precoded enhancement layer grade data to each transmitting antenna of the base station for transmitting.
The step of performing different pre-coding on the base layer level data and the enhancement layer level data respectively comprises:
performing Space Frequency Block Coding (SFBC) or cyclic delay Coding (CDD) on the base layer level data;
and carrying out horizontal layered space-time structure HBLAST coding, vertical layered space-time structure VBLAST coding or diagonal layered space-time structure DBLAST coding on the enhancement layer level data.
The step of mapping the precoded base layer level data and the precoded enhancement layer level data to each transmitting antenna of the base station for transmission comprises the following steps:
performing parallel-to-serial conversion on the encoded base layer level data and enhancement layer level data;
and mapping the converted coded data to each transmitting antenna of the base station in series in the time domain for transmission.
The step of mapping the precoded base layer level data and the precoded enhancement layer level data to each transmitting antenna of the base station for transmission specifically comprises the following steps:
and mapping the coded base layer level data and the coded enhancement layer level data on each transmitting antenna of the base station in parallel on a frequency domain for transmission.
The indication information of the base layer level data and the enhancement layer level data includes: the position of a time-frequency resource block occupied by the base layer level data and the enhancement layer level data in the transmission and the initial time information of the transmission, and/or a mapping mode, and/or a pre-coding mode, and/or an adopted coding and modulating mode.
And transmitting the indication information of the base layer level data and the enhancement layer level data together with the service navigation overhead of the multimedia broadcast multicast service on a control channel.
A receiving method of evolved Multimedia Broadcast Multicast Service (MBMS), the method comprising the steps of:
a terminal acquires indication information of base layer grade data and enhancement layer grade data sent by a base station;
when the terminal has only one receiving antenna, only receiving and demodulating the base layer grade data according to the indication information;
and when the terminal has a plurality of receiving antennas, simultaneously receiving and demodulating the base layer level data and the enhancement layer level data according to the indication information.
And the terminal acquires the indication information of the basic layer grade data and the enhancement layer grade data through a control channel.
The method further comprises:
and converting the working state and the dormant state of the terminal according to the indication information.
The step of the terminal for switching the working state and the dormant state comprises the following steps:
when the base layer level data is transmitted, the terminal is in a working state;
and when the data transmission of the enhancement layer level is carried out, the radio frequency part and the receiving link part of the terminal are enabled to be in a dormant state.
It can be seen from the above technical solutions that, in the present invention, an MBMS service to be broadcasted is decomposed into base layer level data and enhancement layer level data according to levels, and different MIMO techniques are used for transmitting the MBMS data of different levels, so that terminals with different capabilities can effectively receive the MBMS service data, and indication information of the base layer level data and the enhancement layer level data is transmitted on a control channel. Therefore, in various SFN network topological structures, terminals with various capabilities can effectively receive MBMS service data, and the terminals can adopt a power-saving mode when receiving the MBMS service, thereby saving the power consumption of the terminals. The invention fully adopts various MIMO technologies, effectively improves the performance of the MBMS, improves the coverage of the MBMS while ensuring the basic MBMS, and simultaneously enables operators to flexibly develop the MBMS with various QoS grades according to the change of the market.
Drawings
Fig. 1 is a flowchart illustrating an implementation of an embodiment of a method for transmitting an evolved multimedia broadcast multicast service according to the present invention;
FIG. 2 is a schematic diagram illustrating the principle of precoding the base layer level data by SFBC coding in the present invention;
FIG. 3 is a schematic diagram illustrating the principle of precoding enhancement layer level data by using a horizontal layered space-time structure coding scheme in the present invention;
FIG. 4 is a flow chart of the present invention for serial mapping of data of a base layer and an enhancement layer;
FIG. 5 is a flow chart of parallel mapping of data of a base layer and an enhancement layer in the present invention;
fig. 6 is a flowchart of an implementation of an embodiment of a method for receiving an evolved multimedia broadcast multicast service according to the present invention.
Detailed Description
The core of the invention is to effectively deploy MBMS service for terminals with various SFN network topological structures and various capabilities, therefore, the invention decomposes one MBMS service to be broadcasted according to grades, decomposes the MBMS service into basic layer grade data and enhancement layer grade data, and transmits the MBMS data with different grades by adopting different MIMO technologies, so that the terminals with different capabilities can effectively receive the MBMS service data, and simultaneously transmits the indication information of the basic layer grade data and the enhancement layer grade data on a control channel.
Based on the sending mode, when receiving MBMS service data, the terminal firstly receives the indication information of the base layer level data and the enhancement layer level data transmitted on the control channel, and then only receives and demodulates the base layer level data if the terminal has only one receiving antenna according to the indication information; if the terminal has two or more receiving antennas, the base layer level data and the enhancement layer level data can be received and demodulated simultaneously, thereby ensuring that terminals with different capabilities can receive MBMS service data.
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
Referring to fig. 1, the implementation process of the method for sending an evolved multimedia broadcast multicast service according to the present invention includes the following steps:
step 101: the multimedia broadcast multicast service is decomposed into base layer level data and enhancement layer level data.
The base layer and the enhancement layer belong to the category of the application layer, and the specific decomposition can have various schemes. Furthermore, the service data decomposition may be performed at a service application layer in the network, that is, the data transmitted to the base station is the decomposed data.
Wherein, the basic layer refers to a basic data part of the MBMS service; the enhancement layer refers to an enhanced data portion of the MBMS service. For example, for a mobile tv, the base layer is an MBMS data portion capable of ensuring the basic definition or fluency of an image, and the enhancement layer can further improve the definition or fluency of an image on the premise of receiving the base layer data.
The decomposition principle is that even if the terminal only receives the MBMS data part of the basic layer, the original MBMS service can be obtained through demodulation and decoding, but the QoS (quality of service) grade of the service is lower; and receiving the data of the base layer and the added layer, the higher-grade QoS service can be obtained.
For example, TR 25.913 (technical report 25.913) requires that E-UTRA (evolved universal terrestrial radio access) MBMS supports at least 16 channels of mobile tv programs, each channel being approximately 300 kbps; 300kbps corresponds to about 30 frames of images to be transmitted per second; a simple decomposition scheme is to decompose a 300kbps mobile tv program into two 15 frames/sec parts, or in an application layer part (program source code part) of the mobile tv program.
Step 102: and respectively adopting different MIMO technologies to transmit the base layer level data and the enhancement layer level data.
In order to ensure the transparency of the transmitting antenna of the base station to the transmitted data, i.e. the transmitting antenna does not need to distinguish which MIMO technology is adopted for transmitting, the invention respectively carries out pre-coding on the MBMS data of two levels of a base layer and an enhancement layer: the MIMO scheme of transmit diversity is adopted for data of the base layer level, and the MIMO scheme of spatial multiplexing is adopted for data of the enhancement layer level. The specific process thereof will be described in detail later.
Step 103: indication information of the base layer level data and the enhancement layer level data is transmitted on a control channel.
As known to those skilled in the art, when a system transmits an MBMS service, multiple different MBMS services are generally transmitted, a terminal needs to know in advance various MBMS service program lists, positions of transmission resource blocks occupied by the MBMS service, start time of MBMS service transmission, transmission periods (transmission intervals) of the MBMS service, pilot frequency sequence numbers used by the MBMS service, coding and modulation modes used during the MBMS service transmission, and the like, which are generally referred to as service navigation overhead. The service navigation overhead is semi-static, i.e. does not change for a certain period of time, and thus the transmission period may be longer relative to the transmission period of the MBMS service. In an evolved MBMS system, this information is transmitted in an MBMS control channel.
Because the MBMS data of the base layer and the enhancement layer are mapped to the transmission resource block in the time domain in a serial multiplexing manner or in the frequency domain in a parallel multiplexing manner, the information such as the resource block position occupied by the two levels of data in the transmission process needs to be notified to the receiving terminal, so that the terminal can accurately receive the corresponding data according to its own capability. In the present invention, such information can be transmitted in MCCH (MBMS control channel) along with service navigation overhead of the evolved MBMS. The information transmitted includes: the position of the transmission resource block occupied by the base layer and the enhancement layer, the starting time of transmission, and/or a mapping mode, and/or a precoding mode, and/or a coding and modulation mode adopted by each layer, and the like.
The information is transmitted on the MCCH, so that the terminal can know the position information of the two levels of data in advance.
Of course, other ways of informing the terminal of this information may be used. For example, the information is transmitted to the terminal along with the base layer service.
The transmission process of the MBMS data of different classes in the present invention will be described in further detail below.
First, different precoding is required for different levels of MBMS data.
For the base layer level data, SFBC or CDD coding scheme or other coding scheme for transmit diversity may be used. As shown in FIG. 2, in the case of SFBC coding, in a base station having two transmission antennas, antenna 1 transmits a data stream of MBMS [ S2S 1 ]]And antenna 2 transmits SFBC-encoded data stream [ -S1 for cell common pilot for antenna 1*S2*](conjugate coding of MBMS data stream) and cell common pilot for antenna 2. If the base station has only one transmitting antenna, one MBMS data stream can be selected for transmission. By this signal processing method, whether the receiving terminal has one set of receiving antenna or multiple sets of receiving antennas, the MBMS data streams which are spatially combined from multiple base stations in the SFN network can be received, and the terminal does not need to know that there are several transmitting antennas in the base stations.
For the enhancement layer level data, a coding mode of a horizontal layered space-time structure, a vertical layered space-time structure, a diagonal layered space-time structure, or other spatial multiplexing coding modes can be adopted. As shown in fig. 3, when the space-time structure HBLAST coding scheme with horizontal layering is adopted, the MBMS data stream D of the enhancement layer is converted from serial to parallel to form two independent data streams, and then modulated, coded and interleaved (different coding and modulation can be adopted) respectively and sent to respective transmitting antennas together with pilot signals of respective antennas. And a terminal with more than two sets of receiving links can demodulate the data stream of the enhancement layer.
And then mapping the precoded base layer level data and the precoded enhancement layer level data to each transmitting antenna of the base station for transmitting.
A serial mapping may be used, which is performed in the time domain, that is, the data of the base layer and the data of the enhancement layer occupy all transmission resource blocks exclusively in different time slices. This serial mapping can be represented as shown in fig. 4:
step 401: performing HBLAST coding on the enhancement layer level data, and performing SFBC coding on the basic layer level data;
step 402: performing parallel-to-serial conversion on the encoded enhancement layer level data and the base layer level data;
step 403: mapping the serial data stream after conversion to transmission resource blocks on different time domains;
step 404: and modulating the mapped transmission resource blocks to different antennas for transmission.
By adopting the serial mapping mode, the terminal can receive the MBMS service in a power-saving mode, and the power consumption of the terminal is saved.
In addition, a parallel mapping method may also be adopted, where the parallel mapping method is performed in the frequency domain, that is, the data of the base layer and the enhancement layer occupy a part of all transmission resource blocks respectively, and then are sent to each transmission antenna of the base station at the same time. This parallel mapping may be represented as shown in fig. 5:
step 501: performing HBLAST coding on the enhancement layer level data, and performing SFBC coding on the basic layer level data;
step 502: mapping the encoded enhancement layer level data and the encoded base layer level data to transmission resource blocks of different frequency domains;
step 503: and modulating the mapped transmission resource blocks to different antennas for transmission.
It can be seen that the present invention adopts different MIMO techniques for data transmission of the base layer and the enhancement layer: the base layer adopts a transmission diversity MIMO mode, and the enhancement layer adopts a spatial multiplexing MIMO mode, so the SNR (received signal-to-noise ratio) of the data received by the terminal from the base layer is higher than that of the data received by the enhancement layer. That is, the base layer data has a wider coverage area than the enhancement layer data. Furthermore, the invention can reasonably adjust the sending power of each transmission resource by adopting the parallel mapping mode, thereby improving the coverage of the MBMS service; on the other hand, when the receiving bandwidth of the terminal is smaller than the transmission bandwidth of the system, the terminal can still have the ability to flexibly receive the MBMS service of the base layer.
For example, increasing the transmission power of the base layer data can further increase the coverage area of the base layer data, and certainly, the coverage area of the enhancement layer data will decrease; or increasing the transmission power of the enhancement layer data can increase the coverage area of the enhancement layer data, and even the two portions of data can have the same coverage area by reasonably allocating the power resources of the two portions of data.
For another example, if a parallel mapping mode is adopted, the bandwidth for transmitting the MBMS service is 5 Mhz. Wherein 2.5Mhz is used for the base layer and 2.5Mhz is used for the enhancement layer; when the receiving bandwidth of the terminal is 2.5Mhz, the capability of receiving and demodulating the data of the basic layer part still exists, so that the realization of the basic MBMS service can be ensured for the terminal with small receiving bandwidth.
The present invention is not limited to the above two mapping manners, and the data of the base layer and the enhancement layer may be mapped onto the transmission resource units with different dimensions in other manners according to the application requirements.
In the present invention, for the transmission of two levels of data blocks of the base layer and the enhancement layer, not only the same modulation and coding rate scheme but also different sizes and different modulation and coding rate schemes can be adopted. Thus, not only can the spectrum efficiency of the evolution MBMS service transmission be further improved, but also the operator can properly adjust the size and MCS (modulation and coding scheme) of the two-level data block according to the market demand and the change of the terminal popularity, thereby realizing the flexible deployment of the MBMS services with various QoS levels. For example, increasing the size of the base layer data block can improve the QoS of the low-end user for receiving the MBMS service; the size of the enhancement layer data is increased, and the frequency spectrum efficiency of the spatial multiplexing MIMO technology adopted by the enhancement layer data is superior to that of the transmission diversity MIMO technology adopted by the base layer data, so that the frequency spectrum efficiency of the whole MBMS transmission can be improved, namely more MBMS data can be transmitted on a unit resource block, and the performance of receiving the MBMS by a high-end user can be improved. By adjusting the MCS, the spectrum efficiency of MBMS service transmission, the coverage area of the MBMS service and the QoS of the MBMS service can be changed. For example, if the modulation mode is increased from the original 4PSK (4 phase shift keying modulation) to 16QAM (16 state quadrature amplitude keying modulation), and/or the coding rate is increased from the original 1/2 to 2/3, the spectrum efficiency of MBMS transmission will be increased, the space-to-occupied ratio will be increased, but at the same time, the coverage area of the MBMS will be reduced, and the QoS of the MBMS will be reduced; whereas if the MCS is lowered the opposite is concluded. The MCS adjustment may be for both layers of data or for only one layer of data.
Referring to fig. 6, the implementation process of the method for receiving evolved multimedia broadcast multicast service of the present invention includes the following steps:
step 601: the terminal acquires indication information of the base layer level data and the enhancement layer level data.
As mentioned in the foregoing description of the method for transmitting an evolved multimedia broadcast multicast service according to the present invention, in order to enable terminals with different capabilities to receive corresponding MBMS service data, indication information of base layer level data and enhancement layer level data needs to be transmitted on a control channel or transmitted along with the base layer service data. Therefore, when the terminal receives the MBMS data, it first needs to acquire the indication information of the base layer level data and the enhancement layer level data from the control channel or other traffic channels. These pieces of information include: the position of the transmission resource block occupied by the base layer and the enhancement layer, the starting time of transmission, and/or a mapping mode, and/or a precoding mode, and/or a coding and modulation mode adopted by each layer, and the like.
Step 602: and when the terminal has only one receiving antenna, only receiving and demodulating the base layer grade data according to the indication information.
Step 603: and when the terminal has a plurality of receiving antennas, simultaneously receiving and demodulating the base layer level data and the enhancement layer level data according to the indication information.
According to the indication information, the terminal can be switched between the working state and the dormant state, so that the power consumption of various terminals is saved.
For example, for a low-end terminal, through the indication information, when the base layer level data is transmitted, the terminal is in a working state, and when the enhancement layer level data is transmitted, the radio frequency part and the receiving link part of the terminal are switched into a dormant state, so that a larger space-to-space ratio is obtained to save power consumption; for the high-end terminal, the indication information can be used as well, and under the condition that the power of the terminal is low or for the purpose of saving expenditure, the terminal is selected to be switched to only receive the data stream of the base layer grade or only subscribe the service of the base layer grade, so that the purpose of saving power can be achieved.
While the present invention has been described with respect to the embodiments, those skilled in the art will appreciate that there are numerous variations and permutations of the present invention without departing from the spirit of the invention, and it is intended that the appended claims cover such variations and modifications as fall within the true spirit of the invention.
Claims (12)
1. A method for transmitting evolved multimedia broadcast multicast service, the method comprising the steps of:
A. decomposing the multimedia broadcast multicast service to be transmitted into base layer level data and enhancement layer level data;
B. transmitting the base layer level data and the enhancement layer level data by adopting different Multiple Input Multiple Output (MIMO) technologies respectively;
C. indication information of the base layer level data and the enhancement layer level data is transmitted on a control channel.
2. The method of claim 1, wherein step B comprises:
transmitting the base layer level data by adopting the MIMO technology of transmit diversity;
and transmitting the enhancement layer level data by adopting a spatial multiplexing MIMO technology.
3. The method of claim 1 or 2, wherein the step B further comprises:
respectively carrying out different pre-coding on the base layer level data and the enhancement layer level data;
and mapping the precoded base layer grade data and the precoded enhancement layer grade data to each transmitting antenna of the base station for transmitting.
4. The method of claim 3, wherein the step of differentially precoding the base layer level data and the enhancement layer level data, respectively, comprises:
performing Space Frequency Block Coding (SFBC) or cyclic delay Coding (CDD) on the base layer level data;
and carrying out horizontal layered space-time structure HBLAST coding, vertical layered space-time structure VBLAST coding or diagonal layered space-time structure DBLAST coding on the enhancement layer level data.
5. The method of claim 3, wherein the step of mapping the precoded base layer level data and the precoded enhancement layer level data to respective transmission antennas of the base station for transmission comprises:
performing parallel-to-serial conversion on the encoded base layer level data and enhancement layer level data;
and mapping the converted coded data to each transmitting antenna of the base station in series in the time domain for transmission.
6. The method according to claim 3, wherein the step of mapping the precoded base layer level data and the precoded enhancement layer level data to each transmission antenna of the base station for transmission specifically comprises:
and mapping the coded base layer level data and the coded enhancement layer level data on each transmitting antenna of the base station in parallel on a frequency domain for transmission.
7. The method of claim 1, 2 or 3, wherein the indication information of the base layer level data and the enhancement layer level data comprises: the position of a time-frequency resource block occupied by the base layer level data and the enhancement layer level data in the transmission and the initial time information of the transmission, and/or a mapping mode, and/or a pre-coding mode, and/or an adopted coding and modulating mode.
8. The method of claim 7,
and transmitting the indication information of the base layer level data and the enhancement layer level data together with the service navigation overhead of the multimedia broadcast multicast service on a control channel.
9. A method for receiving evolved multimedia broadcast multicast service, the method comprising the steps of:
a terminal acquires indication information of base layer grade data and enhancement layer grade data sent by a base station;
when the terminal has only one receiving antenna, only receiving and demodulating the base layer grade data according to the indication information;
and when the terminal has a plurality of receiving antennas, simultaneously receiving and demodulating the base layer level data and the enhancement layer level data according to the indication information.
10. The method of claim 9,
and the terminal acquires the indication information of the basic layer grade data and the enhancement layer grade data through a control channel.
11. The method according to claim 9 or 10, characterized in that the method further comprises:
and converting the working state and the dormant state of the terminal according to the indication information.
12. The method of claim 11, wherein the step of the terminal performing the active state and sleep state transition comprises:
when the base layer level data is transmitted, the terminal is in a working state;
and when the data transmission of the enhancement layer level is carried out, the radio frequency part and the receiving link part of the terminal are enabled to be in a dormant state.
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| CN102106164A (en) * | 2008-03-21 | 2011-06-22 | 北方电讯网络有限公司 | Multimedia broadcast multicast service (MBMS) utilizing spatial multiplexing |
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| CN111211874A (en) * | 2014-08-25 | 2020-05-29 | 韩国电子通信研究院 | Apparatus and method for generating broadcast signal frame using hierarchical division multiplexing |
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