CN1960353B - Method and system of setting up reference signal for multiplexing service data - Google Patents

Abstract

The method comprises: for each cell, allocating the first reference signal used for estimating the channel for bearing non broadcast and multicast service data, and the second reference signal used for estimating the channel for bearing the Broadcast and multicast data; each cell inserts the first reference signal into the non broadcast and multicast service data subcarrier in the subframe multiplexed with the broadcast service data and non broadcast service data, and inserts the second reference signal into the broadcast and multicast service data subcarrier in the subframe multiplexed with the broadcast and multicast service data and non broadcast and multicast data, and sends them to the user end.

Description

Method and system for setting reference signal for multiplexing service data

technical field

The present invention relates to the technical field of reference signal design, in particular to a method and system for setting reference signals for multiplexing service data. the

Background technique

Since the 1990s, multi-carrier technology has become a hot technology in broadband wireless communication. Its basic idea is to divide a broadband carrier into multiple sub-carriers and transmit data simultaneously on the divided sub-carriers. In most system applications, the width of subcarriers is smaller than the coherent bandwidth of the channel, so that on frequency selective channels, the fading on each subcarrier is flat fading, which reduces the crosstalk between user data symbols, and It does not require complex channel equalization and is suitable for high-speed data transmission. Existing multi-carrier technology has many forms, such as Orthogonal Frequency Division Multiplexing Access (OFDMA, Orthogonal Frequency Division Multiplex Access), multi-carrier CDMA (MC-CDMA, MultiplexCarrier CDMA), multi-carrier direct spread spectrum CDMA (MC-DS -CDMA, MultiplexCarrier-Direct Spread-CDMA) and time-frequency domain two-dimensional extension, etc., and also includes a variety of extension technologies based on these technologies. the

Among them, Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplex) technology is a representative technology among multi-carrier technologies, which divides a given channel into several orthogonal sub-channels in the frequency domain, and allows sub-carriers The frequency spectrum partially overlaps, because as long as different subcarriers are mutually orthogonal, different data signals can be separated from the overlapping subcarriers. the

Please refer to Fig. 1, which is a schematic diagram of the modulation and demodulation processing process of the existing basic OFDM system. As shown in Fig. 1, in the OFDM system, user data is first processed through channel coding and interleaving, and then adopts a certain modulation method ( For example, modulation methods such as BPSK, QPSK, and QAM are used to modulate the coded and interleaved data to form user data symbols, and the user data symbols are then modulated to the radio frequency after OFDM operations, and the reverse demodulation process is the same as this process On the contrary, I won’t go into details here. the

Among them, in the above-mentioned OFDM operation, the user data symbols must first be serially/parallel converted to form multiple low-rate sub-data streams, wherein each sub-data stream occupies a sub-carrier, and each sub-data stream is mapped to a corresponding sub-carrier The processing on can be realized by inverse discrete Fourier transform (IDFT, Inverse Discrete Fourier Transformation) or inverse fast Fourier transform (IFFT, Inverse FastFourier Transformation) processing. Then add a cyclic prefix (CP) to the IDFT or IFFT-processed time-domain signal by adding a cyclic prefix (CP, Cyclic Prefix) as a guard interval, which can greatly reduce or even eliminate intersymbol interference and ensure that each channel The orthogonality between channels greatly reduces the interference between channels. the

At present, the realization of Multimedia Broadcast/Multicast Service (MBMS, Multimedia Broadcast/Multicast Service) on OFDM multi-carrier technology is one of the more important services in the Long-Time Evolution project organization (LTE, Long-Time Evolution). The MBMS service mainly refers to the service that the network side simultaneously broadcasts or multicasts the same multimedia data to multiple receivers in the network, and the current multimedia data mainly includes some streaming services and background (Background) services. the

As mentioned above, in order to reduce the intersymbol interference caused by multipath delay, it is usually avoided by adding CP to the time domain signal after IDFT or IFFT processing. The longer the CP added, the better the resistance to multipath delay. The stronger the intersymbol interference capability is, but the longer CP also causes the further reduction of transmission efficiency. Therefore, in the actual OFDM system, the length of the CP should be set to different values according to different application scenarios. the

In the LTE project, there are two types: short CP and long CP. The duration of the short CP is T _CP ≈ 4.7μs, which is mainly used in the case of non-broadcast and multicast services (Unicast, Unicast mainly includes some unicast services, etc.) Next; the time length of the long CP is _TCP ≈ 16.7μs, which is mainly used in the case of multimedia broadcast multicast service (MBMS) and a relatively large cell diameter. For a cell with a relatively small diameter, or when the system sends Unicast services, use the short CP; and when the system sends MBMS services, or when the diameter of the cell is relatively large, use the long CP.

Usually, the system sends the Unicast service and the MBMS service after Time Division Multiplexing (TDM, Time Division Multiple) processing, that is, some sub-frames (SBF, Sub-frame) are used to transmit the MBMS service on the time axis, And some other subframes SBF are used to transmit the Unicast service. the

Please refer to Figure 2, which is a schematic diagram of the state of time-division multiplexing processing of existing Unicast services and MBMS services. The base station relatively independently schedules and sends its own Unicast service data; and uses the long CP to transmit the MBMS service in the subframes SBF1, SBF4 and SBF5, wherein each cell sends the same MBMS service data, and the user terminal (UE, User Equipment ) to demodulate the MBMS service data sent by the system according to the corresponding control information. If the UE is at the edge of the cell, it can use the combination method to combine multiple MBMS service signals received from multiple cells to improve the signal-to-noise ratio and the coverage at the cell edge. the

Based on the above method of time-division multiplexing Unicast and MBMS services, the subsequent LTE project organization proposed a multiplexing method of simultaneously multiplexing MBMS services and Unicast services in the same subframe SBF, which is defined as the multiplexing of MBMS services and Unicast services in the same subframe MBMS service and Unicast service perform frequency division multiplexing (FDM, Frequency Division Multiple) mode. the

Please refer to Figure 3, which is a schematic diagram of the status of frequency division multiplexing processing of Unicast services and MBMS services in the same subframe in the research stage of the LTE project organization. In the figure, subframes SBF2, SBF3, SBF4 and SBF5 Frequency division multiplexing of Unicast service and MBMS service, that is, in SBF2, SBF3, SBF4 and SBF5, different frequencies are used to carry and send Unicast service data and MBMS service data, and there are Unicast service and MBMS service in frequency division multiplexing In the same subframe of the service, the cell transmits the Unicast service and the MBMS service based on the CP of the same length. the

Since the above-mentioned scheme of frequency division multiplexing of Unicast service and MBMS service in the same subframe is still in the research stage in the LTE project organization, for the UE side, how to demodulate the Frequency division multiplexing of Unicast service data and MBMS service data in the same subframe is a very important issue. the

Contents of the invention

The technical problem to be solved by the present invention is to propose a method and system for setting reference signals for multiplexing service data, so as to insert appropriate reference signals into subframes multiplexed with broadcast multicast service data and non-broadcast multicast service data. The signal assists the user terminal to respectively demodulate different service data multiplexed in the subframe. the

In order to solve the above problems, the technical scheme proposed by the present invention is as follows:

A method for setting reference signals for multiplexing service data, comprising steps:

The system assigns to each cell the first reference signal used for channel estimation of the channel carrying non-broadcast multicast service data, and the second reference signal used for channel estimation of the channel carrying broadcast multicast service data;

Each cell respectively inserts the first reference signal assigned by the system into the non-broadcast multicast service data subcarrier in the subframe multiplexed with the broadcast multicast service data and the non-broadcast multicast service data; and

The second reference signal is inserted into the broadcast multicast service data subcarrier in the subframe multiplexed with the broadcast multicast service data and the non-broadcast multicast service data, and delivered to the user terminal. the

Preferably, the system allocates mutually orthogonal first reference signals between adjacent cells. the

Preferably, the system allocates the same second reference signal between adjacent cells. the

Preferably, the method further includes each cell inserting the first reference signal assigned by the system into the broadcast multicast service data subcarrier in the subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data in the steps. the

Preferably, between adjacent cells, the first reference signal allocated by the system is inserted into the broadcast multicast service data subcarrier and the non-broadcast multicast service data subcarrier multiplexed in the same subframe in a frequency division manner interleaved with each other middle. the

Preferably, between adjacent cells, the first reference signal allocated by the system is inserted into the non-broadcast multicast subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data in a frequency division manner interleaved with each other. In the service data subcarrier. the

Preferably, between adjacent cells, the first reference signal allocated by the system is inserted into the non-broadcast multicast service in the subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data in a time/frequency interleaved manner in the data subcarrier. the

Preferably, each cell inserts the second reference signal allocated by the system into the broadcast multicast service in the subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data in a time/frequency interleaved manner or in a dispersed manner in the data subcarrier. the

Preferably, the broadcast multicast service data subcarriers and non-broadcast multicast service data subcarriers are multiplexed in the same subframe by frequency division multiplexing, time division multiplexing or distributed multiplexing. the

Preferably, the broadcast multicast service data subcarrier and the non-broadcast multicast service data subcarrier are multiplexed in the same subframe in a frequency division multiplexing manner. the

Preferably, the method also includes the steps of:

The user terminal respectively obtains the inserted first reference signal and the second reference signal from the broadcast multicast service data subcarrier and the non-broadcast multicast service data subcarrier multiplexed in the same subframe; and

Using the first reference signal to perform channel estimation processing on the channel carrying non-broadcast multicast service data, and using the second reference signal to perform channel estimation processing on the channel carrying broadcast multicast service data; and

The non-broadcast multicast service data and the broadcast multicast service data multiplexed in the same subframe are respectively demodulated based on the channel estimation processing result. the

Preferably, the broadcast multicast service is a multimedia broadcast multicast service. the

A system for setting reference signals for multiplexing service data, comprising:

The first allocation unit is used to allocate for each cell the first reference signal used for channel estimation of the channel carrying the non-broadcast multicast service data;

The second allocation unit is used to allocate to each cell the second reference signal used for channel estimation of the channel carrying the broadcast multicast service data;

The first reference signal insertion unit is configured for each cell to respectively insert the first reference signal allocated by the first allocation unit into the non-broadcast subframes multiplexed with broadcast multicast service data and non-broadcast multicast service data The multicast service data subcarrier is delivered to the user terminal; and

The second reference signal insertion unit is configured for each cell to respectively insert the second reference signal allocated by the second allocation unit into the broadcast group in the subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data The broadcast service data subcarrier is delivered to the user terminal. the

Preferably, the first allocating unit allocates mutually orthogonal first reference signals between adjacent cells. the

Preferably, the second allocating unit allocates the same second reference signal between adjacent cells. the

Preferably, the system further includes a third reference signal insertion unit, configured for each cell to insert the first reference signal allocated by the first allocation unit into the multiplexed broadcast multicast service data and non-broadcast multicast service data. The broadcast and multicast service data subcarriers in the subframe of the service data are delivered to the user terminal. the

The beneficial effect that the present invention can reach is as follows:

The solution of the present invention distributes to each cell the first reference signal used for channel estimation of the channel carrying non-broadcast multicast service data and the second reference signal used for channel estimation of the channel carrying broadcast multicast service data for each cell through the system. Reference signal: each cell respectively inserts the first reference signal and the second reference signal allocated by the system into the broadcast multicast service data subcarrier and the non-broadcast multicast service data subcarrier multiplexed in the same subframe, and delivers to the user terminal. In this way, the system can insert an appropriate reference signal into the same subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data, so as to assist the user terminal UE to control the broadcast multiplexed in the same subframe delivered by the system. The purpose of demodulating the multicast service data and the non-broadcast multicast service data respectively. the

At the same time, the solution of the present invention uses the orthogonality between the first reference signals allocated by the system for channel estimation of the channel carrying non-broadcast and multicast service data between adjacent cells, which can avoid the use of adjacent cells for carrying out channel estimation. The first reference signal for channel estimation of the non-broadcast multicast service data channel interferes with each other, which helps the UE to perform accurate and effective solution to the broadcast multicast service data and non-broadcast multicast service data multiplexed in the same subframe. Tune. the

Description of drawings

Fig. 1 is the schematic diagram of the modulation and demodulation process of existing basic OFDM system;

Fig. 2 is the state schematic diagram of time-division multiplexing processing of existing Unicast service and MBMS service;

Figure 3 is a schematic diagram of the status of frequency division multiplexing processing of Unicast services and MBMS services in the same subframe in the research phase of the LTE project organization;

Fig. 4 is the main realization principle flowchart of the method for multiplexing service data setting reference signal of the present invention;

Fig. 5 shows the insertion of Unicast reference signals with an orthogonal structure between adjacent cells into all subcarriers in a subframe according to the above-mentioned solution of the present invention, and inserting MBMS reference signals with the same structure between adjacent cells into a subframe Schematic diagram of the state in the MBMS subcarrier;

Fig. 6 shows that according to the above-mentioned solution of the present invention, the Unicast reference signals with an orthogonal structure between adjacent cells are only inserted into the Unicast subcarriers in the subframe, and the MBMS reference signals with the same structure between adjacent cells are inserted into the subframe Schematic diagram of the states in the MBMS subcarriers within;

Fig. 7 is a schematic diagram of the distribution state of mutually orthogonal Unicast reference signals between neighboring cells 1, 2 and 3 in a subframe;

Figure 8 is a schematic diagram of the multiplexing state between MBMS reference signals and Unicast reference signals, MBMS subcarriers and Unicast subcarriers in the first embodiment implemented based on the principle of the method of the present invention;

Figure 9 is a schematic diagram of the multiplexing state between MBMS reference signals and Unicast reference signals, MBMS subcarriers and Unicast subcarriers in the second embodiment implemented based on the principle of the method of the present invention;

Figure 10 is a schematic diagram of the multiplexing state between MBMS reference signals and Unicast reference signals, MBMS subcarriers and Unicast subcarriers in the third embodiment implemented based on the principle of the method of the present invention;

Figure 11 is a schematic diagram of the multiplexing state between MBMS reference signals and Unicast reference signals, MBMS subcarriers and Unicast subcarriers in the fourth embodiment implemented based on the principle of the method of the present invention;

Fig. 12 is a structural block diagram of the main components of the system for setting reference signals for multiplexing service data according to the present invention. the

Detailed ways

The scheme of the present invention is based on the technical scheme of frequency division multiplexing MBMS service data and Unicast service data in the same subframe that the LTE project organization is studying at present, proposes how to multiplex the MBMS service data and Unicast service data in the same subframe respectively The reference signal design solution enables the UE side to effectively demodulate the Unicast service data and the MBMS service data multiplexed in the same subframe respectively. the

Among them, in the LTE project organization, the reference signal is defined as having the following main functions:

1) Used for cell identification processing;

2) Used for cell handover processing and cell search measurement;

3) It is used to perform channel quality indicator (CQI, Channel Quality Indicator) measurement and channel estimation processing. the

In the technical solution proposed by the present invention, the main function of the reference signal is to perform channel estimation processing on the channel carrying broadcast multicast service data, and to perform channel estimation processing on the channel carrying non-broadcast multicast service data. The reference signal used for channel estimation processing on the channel carrying Unicast service data can be defined as a Unicast reference signal (that is, the first reference signal described in the scheme below), which is characterized by the Unicast reference signal used between adjacent cells Orthogonality is maintained; the reference signal used for channel estimation processing on the channel carrying MBMS service data can be defined as an MBMS reference signal (ie, the second reference signal described in the scheme below), which is characterized in that adjacent cells use The MBMS reference signal is the same. the

The main realization principle and specific implementation manner of the solution of the present invention will be described in detail below in conjunction with each accompanying drawing. the

Please refer to Fig. 4, this figure is the main realization principle flowchart of the method for multiplexing service data setting reference signal of the present invention, and its main realization process is as follows:

Step S10, the system assigns to each cell a first reference signal for performing channel estimation processing on a channel carrying non-broadcast multicast service data; wherein, in order to ensure the accuracy of demodulated data of the user terminal UE, and to avoid The first reference signals between adjacent cells interfere with each other, and the system needs to allocate mutually orthogonal first reference signals between adjacent cells. the

Step S12, the system assigns to each cell the second reference signal used for channel estimation processing on the channel carrying the broadcast multicast service data; wherein in order to ensure the accuracy of the demodulated data of the UE, the system needs to provide Assign the same second reference signal. the

Step S14, each cell respectively inserts the first reference signal assigned by the system into the non-broadcast multicast service data subcarrier in the subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data, and further Insert the first reference signal into the broadcast multicast service data subcarrier in the subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data; and simultaneously insert the second reference signal into the multiplexed broadcast multicast service data subcarrier In the broadcast multicast service data subcarrier in the subframe of multicast service data and non-broadcast multicast service data, it is delivered to UE;

Step S16, the UE obtains the inserted first reference signal and second reference signal respectively from the broadcast multicast service data subcarrier and the non-broadcast multicast service data subcarrier multiplexed in the same subframe;

Step S18, the UE uses the first reference signal to perform channel estimation processing on the channel carrying the non-broadcast multicast service data;

Step S20, the UE uses the second reference signal to perform channel estimation processing on the channel carrying broadcast and multicast service data;

Step S22, UE demodulates the non-broadcast multicast service data and the broadcast group multiplexed in the same subframe based on the channel estimation processing results in the above steps S18 and S20, combined with the relevant control information delivered by the system broadcast business data. the

In the above step S14, each cell may respectively insert the first reference signal assigned by the system into the broadcast multicast service data subcarrier and the non-broadcast multicast service data subcarrier multiplexed in the same subframe, and respectively The second reference signal allocated by the system is inserted into the broadcast multicast service data subcarrier in the subframe multiplexed with the broadcast multicast service data and the non-broadcast multicast service data. the

Please refer to Figure 5, which shows that according to the above-mentioned solution of the present invention, the Unicast reference signals with an orthogonal structure between adjacent cells are inserted into all subcarriers in the subframe, and the MBMS reference signals with the same structure between adjacent cells are inserted Schematic diagram of the state inserted into the MBMS subcarrier in the subframe. In the system shown in the figure, it is assumed that cell 1, cell 2 and cell 3 are three adjacent cells, and the Unicast reference allocated by the system for these three cells The signal (that is, the first reference signal in the above scheme) has a mutually orthogonal structure, that is, the Unicast reference signal in cell 1, cell 2, and cell 3 adopts an orthogonal TF pattern structure to avoid Unicast between adjacent cells. The reference signals interfere with each other, and the Unicast reference signals thereof can perform effective channel estimation processing on all Unicast subcarriers. At the same time, the system inserts the same MBSM reference signal (that is, the second reference signal in the above solution) for cell 1, cell 2, and cell 3, that is, the MBMS reference signal in cell 1, cell 2, and cell 3 uses the same TF With a pattern structure, the MBMS reference signal can perform effective channel estimation processing on all MBMS sub-carriers. the

Based on the above-mentioned Figure 5, the Unicast reference signals allocated by the system can be inserted into the MBMS subcarriers and Unicast subcarriers multiplexed in the same subframe in a frequency-division manner interleaved between adjacent cells; and the MBMS subcarriers allocated by the system The reference signal is inserted into the MBMS subcarriers in the subframe multiplexed with MBMS service data and Unicast service data in a time/frequency interleaved manner or in a scattered manner (Scattered). Based on these situations, Unicast service data and MBMS service data (a case of broadcast multicast service data) can be multiplexed in the same subframe by frequency division multiplexing, time division multiplexing or scattered multiplexing middle. The above-mentioned multiplexing manner of each service data and the corresponding multiplexing manner of each reference signal will be described in detail in Embodiment 1 and Embodiment 2 below. the

In addition, in the above step S14, each cell can also insert the first reference signal allocated by the system only into the non-broadcast multicast service data in the subframe multiplexed with the broadcast multicast service data and the non-broadcast multicast service data In the subcarriers, the second reference signal allocated by the system is respectively inserted into the broadcast multicast service data subcarriers in the subframe multiplexed with the broadcast multicast service data and the non-broadcast multicast service data. the

Please refer to Fig. 6, which shows that according to the above-mentioned scheme of the present invention, the Unicast reference signals with an orthogonal structure between adjacent cells are only inserted into the Unicast subcarriers in the subframe, and the MBMS reference signals with the same structure between adjacent cells are inserted into Schematic diagram of the state of signal insertion into MBMS subcarriers in a subframe. In the system shown in the figure, it is assumed that cell 1, cell 2, and cell 3 are three adjacent cells, and the Unicast references allocated by the system for these three cells The signal (that is, the first reference signal in the above scheme) has a mutually orthogonal structure, that is, the Unicast reference signal in cell 1, cell 2, and cell 3 adopts an orthogonal TF pattern structure to avoid Unicast between adjacent cells. The reference signals interfere with each other, but each cell only sets the Unicast reference signal allocated by the system on the Unicast subcarrier in the subframe multiplexed with Unicast service data and MBMS service data at the same time, and does not set Unicast on the corresponding MBMS subcarrier. As for the reference signal (this point is the difference from the scheme in Fig. 5 above), its Unicast reference signal can perform effective channel estimation processing on all Unicast subcarriers. At the same time, the system inserts the same MBSM reference signal (that is, the second reference signal in the above solution) for cell 1, cell 2, and cell 3, that is, the MBMS reference signal in cell 1, cell 2, and cell 3 uses the same TF With a pattern structure, the MBMS reference signal can perform effective channel estimation processing on all MBMS sub-carriers. the

Based on the above-mentioned Figure 6, the Unicast reference signals allocated by the system can be inserted into subframes multiplexed with MBMS service data and Unicast service data in a mutually staggered frequency division manner or in a time/frequency interleaved manner between adjacent cells and insert the MBMS reference signal allocated by the system into the MBMS subcarrier in the subframe multiplexed with MBMS service data and Unicast service data in a time/frequency interleaved manner or in a scattered manner (Scattered). Based on these situations, Unicast service data and MBMS service data (a case of broadcast multicast service data) should be selected to be multiplexed in the same subframe in a frequency division multiplexing manner. The above-mentioned multiplexing manner of each service data and the corresponding multiplexing manner of each reference signal will be described in detail in Embodiment 3 and Embodiment 4 below. the

Below, based on the principle of the method for setting reference signals for multiplexing service data proposed above in the present invention, several specific embodiments are listed for detailed description, and it is assumed that each specific embodiment is implemented in the parameter environment of the following table:

Table 1: Parameter assumptions transmission bandwidth 5MHz subframe duration 0.5ms Bandwidth per subcarrier 15kHz FFT transform size 512 Useful number of subcarriers 300 The number of subcarriers occupied by the Unicast reference signal 75 Unicast reference signal distribution pattern Frequency division method (as shown in Figure 7 below) Orthogonal method of Unicast reference signals between neighboring cells Stagger each other and do not overlap (as shown in Figure 7 below)

Please refer to FIG . 7 , which is a schematic diagram of the distribution state of mutually orthogonal Unicast reference signals between adjacent cells 1, 2 and 3 in a subframe, wherein adjacent cells 1, 2 and 3 are mutually orthogonal The Unicast reference signals in the same subframe are separated by frequency division, and the Unicast reference signals between adjacent cells are staggered and do not overlap each other.

Please refer to FIG. 8, which is a schematic diagram of the multiplexing state between MBMS reference signals and Unicast reference signals, MBMS subcarriers and Unicast subcarriers in the first embodiment implemented based on the principle of the method of the present invention. In this embodiment, In the same subframe, the Unicast reference signal distribution state in the above-mentioned Figure 7 remains unchanged between adjacent cells 1, 2 and 3, and the multiplexing mode of MBMS service data and Unicast service data is a scattered multiplexing mode (Scattered, also known as frequency hopping multiplexing method), the MBMS reference signal is distributed in a time/frequency interleaved manner, and its specific implementation process is as follows:

(1) At the beginning of each subframe, cell 1, cell 2, and cell 3 (hereinafter referred to as each cell) respectively place their respective Unicast reference signals according to the state shown in Figure 7 above, and schedule their respective Unicast service data to Unicast on the subcarrier. the

(2) Each cell respectively places MBMS reference signals according to the MBMS reference signal positions shown in FIG. 8 , and schedules corresponding MBMS service data to MBMS subcarriers. the

(3) Each cell transmits the multiplexed service data through a transmitter after modulation. the

(4) After the UE receives the multiplexed business data, it obtains the Unicast reference signal of its own cell to perform channel estimation processing on the channel carrying the Unicast business data, and uses the channel estimation processing results and related control information delivered by the system The Unicast service data in the subframe multiplexed with the MBMS service data and the Unicast service data is demodulated. the

(5) After the UE receives the multiplexed service data, it obtains the MBMS reference signal of its own cell to perform channel estimation processing on the channel carrying the MBMS service data, and uses the channel estimation processing results and related control information issued by the system The MBMS service data in the subframe multiplexed with the MBMS service data and the Unicast service data is demodulated. the

Please refer to FIG. 9, which is a schematic diagram of the multiplexing state between MBMS reference signals and Unicast reference signals, MBMS subcarriers and Unicast subcarriers in the second embodiment implemented based on the principle of the method of the present invention. In this embodiment, In the same subframe, the Unicast reference signal distribution state in Figure 7 above remains unchanged between adjacent cells 1, 2, and 3, and the multiplexing mode of MBMS service data and Unicast service data is time division multiplexing (TDM). The signal is distributed in a scattered manner (Scattered), and it is assumed that the scattered position sequence is known in advance on both the system side and the UE side. The specific implementation process is similar to the implementation process in the first embodiment above, except that in step (2) Each cell respectively places MBMS reference signals according to the MBMS reference signal positions shown in Figure 9, and schedules corresponding MBMS service data to MBMS subcarriers. The other processes are the same, and will not be repeated here. the

Please refer to FIG. 10, which is a schematic diagram of the multiplexing state between MBMS reference signals and Unicast reference signals, MBMS subcarriers and Unicast subcarriers in the third embodiment implemented based on the principle of the method of the present invention. In this embodiment, In the same subframe, adjacent cells 1, 2, and 3 only guarantee to insert the corresponding Unicast reference signal on the Unicast subcarrier, and make the distribution state of the Unicast reference signal as shown in Figure 7 above, MBMS service data and Unicast service data The multiplexing method is frequency division multiplexing (FDM), the MBMS reference signal is distributed in a scattered manner (Scattered), and it is assumed that the scattered position sequence is known in advance on the system side and the UE side, and its specific implementation process is as follows:

(11) At the beginning of each subframe, cell 1, cell 2, and cell 3 (hereinafter referred to as each cell) respectively, according to the number of Unicast subcarriers they occupy, follow the state shown in Figure 7 above on the corresponding Unicast subcarriers To respectively place respective Unicast reference signals, and schedule respective Unicast service data to Unicast subcarriers. the

(12) According to the scattered position sequence of MBMS reference signal shown in Figure 10 (assuming that the scattered position sequence of MBMS reference signal is known in advance at both the system side and the UE side), each cell respectively places MBMS reference signal and schedules corresponding The MBMS service data is sent to the MBMS sub-carrier. the

Subsequent implementation process is the same as step (3) to step (5) in the above-mentioned first embodiment, and will not be repeated here. the

Please refer to FIG. 11, which is a schematic diagram of the multiplexing state between MBMS reference signals and Unicast reference signals, MBMS subcarriers and Unicast subcarriers in the fourth embodiment implemented based on the principle of the method of the present invention. In this embodiment, The same subframe contains 12 symbols, which are called long subframes. Neighboring cells 1, 2 and 3 only ensure that the corresponding Unicast reference signals are inserted on the Unicast subcarriers. The Unicast reference signals are interleaved in time/frequency Distributed, which is different from the distribution position state of the Unicast reference signal in Figure 7 above, and it is assumed that the distribution position state of the Unicast reference signal is known in advance on the system side and the UE side; the multiplexing method of MBMS service data and Unicast service data It is a frequency division multiplexing method (FDM), MBMS reference signals are distributed in a time/frequency interleaved manner (Scattered), and assuming that the time/frequency interleaved sequence is known in advance at the system side and the UE side, the specific implementation process is as follows:

(21) At the beginning of each subframe, cell 1, cell 2, and cell 3 (hereinafter referred to as each cell) are respectively based on the number of Unicast subcarriers they occupy, and on the corresponding Unicast subcarriers, they are pre-known by both the cell and the UE. The time/frequency interleaving method is used to respectively place respective Unicast reference signals, and schedule respective Unicast service data to Unicast subcarriers. the

(22) According to the time/frequency interleaving position sequence of the MBMS reference signal shown in Figure 11 (assuming that the time/frequency interleaving position sequence of the MBMS reference signal is known in advance at both the system side and the UE side), each cell places MBMS reference signal, and schedule corresponding MBMS service data to MBMS subcarriers. the

Subsequent implementation process is the same as step (3) to step (5) in the above-mentioned first embodiment, and will not be repeated here. the

In summary, based on the principle of the method for setting reference signals for multiplexing service data proposed by the present invention, UE can effectively demodulate broadcast and multicast service data multiplexed in the same subframe delivered by the system (such as MBMS Service data) and non-broadcast multicast service data (such as Unicast service data), thus solving and perfecting the technical problems encountered by the LTE project organization. the

Corresponding to the principle of the method for setting reference signals for multiplexing service data proposed above, the present invention also proposes a system for setting reference signals for multiplexing service data, please refer to FIG. The main structural block diagram of the system for data setting reference signal, which mainly includes the first distribution unit 10, the second distribution unit 20, the first reference signal insertion unit 30 and the second reference signal insertion unit 40, wherein the main functions of each component as follows:

The first allocating unit 10 is mainly used to allocate to each cell the first reference signal for performing channel estimation processing on the channel carrying the non-broadcast multicast service data; wherein, in order to ensure the accuracy of demodulated data of the user terminal UE, To avoid mutual interference of first reference signals between adjacent cells, the first allocation unit 10 allocates mutually orthogonal first reference signals between adjacent cells. the

The second allocating unit 20 is mainly used to allocate to each cell the second reference signal used for channel estimation processing on the channel carrying the broadcast multicast service data; wherein, in order to ensure the accuracy of the demodulated data of the UE, the second allocating Unit 20 allocates the same second reference signal between adjacent cells. the

The first reference signal insertion unit 30 is mainly used for each cell to respectively insert the first reference signal allocated by the first allocation unit 10 into the subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data In non-broadcast multicast service data subcarriers;

The second reference signal insertion unit 40 is mainly used for each cell to insert the second reference signal allocated by the second allocation unit 20 into the subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data In the broadcast multicast service data subcarrier. the

The third reference signal insertion unit 50 is mainly used for each cell to respectively insert the first reference signal allocated by the first allocation unit 10 into the subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data In the broadcast multicast service data subcarrier. the

The other technical implementation details in the system of the present invention are the same or similar to the corresponding technical implementation details in the above-mentioned method of the present invention. Please refer to the relevant technical implementation details in the above-mentioned method, which will not be repeated in the specific elaboration of the system of the present invention here. More details. the

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations. the

Claims (12)

1. A method for setting reference signal for multiplexing service data, is characterized in that, comprises steps: The system assigns to each cell a first reference signal for channel estimation of a channel carrying non-broadcast multicast service data and a second reference signal for channel estimation of a channel carrying broadcast multicast service data, wherein , the system allocates mutually orthogonal first reference signals and the same second reference signals to adjacent cells; Each cell respectively inserts the first reference signal assigned by the system into the non-broadcast multicast service data subcarrier in the subframe multiplexed with the broadcast multicast service data and the non-broadcast multicast service data, and The second reference signal is inserted into the broadcast multicast service data subcarrier in the subframe multiplexed with the broadcast multicast service data and the non-broadcast multicast service data, and delivered to the user terminal. 2. The method according to claim 1, further comprising inserting the first reference signal assigned by the system into the subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data for each cell Steps in the broadcast multicast service data subcarrier. 3. The method according to claim 2, wherein adjacent cells insert the first reference signal allocated by the system into the broadcast multicast service data multiplexed in the same subframe in a frequency division manner interleaved with each other subcarriers and non-broadcast multicast service data subcarriers. 4. The method according to claim 1, wherein the first reference signal allocated by the system is inserted between adjacent cells in a frequency division manner interleaved with each other and multiplexed with broadcast multicast service data and non-broadcast multicast service data. In the non-broadcast multicast service data subcarrier in the service data subframe. 5. The method according to claim 1, wherein the first reference signal allocated by the system is inserted between adjacent cells in a time/frequency interleaved manner into multiplexed broadcast multicast service data and non-broadcast multicast service data. In the non-broadcast multicast service data subcarrier in the data subframe. 6. The method according to claim 1, wherein each cell inserts the second reference signal allocated by the system in a time/frequency interleaved manner or in a dispersed manner into multiplexed broadcast multicast service data and non-broadcast multicast data. In the broadcast multicast service data subcarrier in the service data subframe. 7. The method according to claim 2, wherein the broadcast multicast service data subcarrier and the non-broadcast multicast service data subcarrier are multiplexed in frequency division multiplexing mode, time division multiplexing mode or distributed multiplexing mode used in the same subframe. 8. The method according to claim 1, wherein the broadcast multicast service data subcarrier and the non-broadcast multicast service data subcarrier are multiplexed in the same subframe in a frequency division multiplexing manner. 9. The method according to any one of claims 1 to 8, further comprising the steps of: The user terminal respectively obtains the inserted first reference signal and the second reference signal from the broadcast multicast service data subcarrier and the non-broadcast multicast service data subcarrier multiplexed in the same subframe; and performing channel estimation processing on a channel carrying non-broadcast multicast service data by using the first reference signal, and performing channel estimation processing on a channel carrying broadcast multicast service data by using the second reference signal; and The non-broadcast multicast service data and the broadcast multicast service data multiplexed in the same subframe are respectively demodulated based on the channel estimation processing result. 10. The method according to claim 9, wherein the broadcast multicast service is a multimedia broadcast multicast service. 11. A system for setting reference signals for multiplexing service data, characterized in that it comprises: The first allocating unit is configured to respectively allocate to each cell a first reference signal for channel estimation of a channel carrying non-broadcast multicast service data; The second allocating unit is configured to allocate to each cell a second reference signal used for channel estimation on a channel carrying broadcast multicast service data, and the first allocating unit allocates mutually orthogonal signals between adjacent cells a first reference signal and the same second reference signal; The first reference signal insertion unit is configured for each cell to respectively insert the first reference signal allocated by the first allocation unit into the non-broadcast subframes multiplexed with broadcast multicast service data and non-broadcast multicast service data Deliver the multicast service data to the user terminal in the subcarrier; and The second reference signal insertion unit is configured for each cell to respectively insert the second reference signal allocated by the second allocation unit into the broadcast group in the subframe multiplexed with broadcast multicast service data and non-broadcast multicast service data The broadcast service data subcarrier is delivered to the user terminal. 12. The system according to claim 11, further comprising a third reference signal insertion unit, configured for each cell to insert the first reference signal allocated by the first allocation unit into the multiplexed broadcast group broadcast service data and non-broadcast multicast service data sub-carriers in the broadcast multicast service data sub-carriers, and send it to the user terminal.

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