CN1960353A - Method and system of setting up reference signal for multiplexing service data - Google Patents
Method and system of setting up reference signal for multiplexing service data Download PDFInfo
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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
Technical field
The present invention relates to the reference signal design technical field, especially relate to a kind of method and system thereof that reference signal is set for the multiplexing service data.
Background technology
Since the nineties in 20th century, multi-transceiver technology becomes the hot spot technology of broadband wireless communications, and its basic thought is that a bandwidth carrier is divided into a plurality of subcarriers, and transmits data simultaneously on a plurality of subcarriers that mark off.In the middle of the system applies of majority, the width of subcarrier is less than the coherence bandwidth of channel, make like this on frequency-selective channel, decline on each subcarrier is a flat fading, so just reduced crosstalking between the user data symbol, and do not need complicated channel equalization, be suitable for the transmission of high data rate.Existing multi-transceiver technology has various ways, insert (OFDMA as OFDM, OrthogonalFrequency Division Multiplex Access), CDMA multiple carrier (MC-CDMA, MultiplexCarrier CDMA), multicarrier CDMA direct spread (MC-DS-CDMA, MultiplexCarrier-Direct Spread-CDMA) and time-frequency domain two-dimensional expansion etc., be included in the multiple expansion technique on these technical foundation in addition.
Wherein, OFDM (OFDM, Orthogonal Frequency Division Multiplex) technology is more representational a kind of technology in the middle of the multi-transceiver technology, it is divided into some orthogonal sub-channels with given channel in frequency domain, and allow subcarrier spectrum to overlap, as long as, just can isolate different data-signals from overlapping subcarrier because satisfy between the different sub carrier mutually orthogonally.
Please refer to Fig. 1, this figure is the modulation and demodulation system processing procedure schematic diagram that has basic ofdm system now, as shown in Figure 1, in ofdm system, user data at first passes through chnnel coding and interleaving treatment, adopt the data after certain modulation system (as adopting modulation systems such as BPSK, QPSK and QAM) is handled code interleaving to modulate then to form user data symbol, user data symbol is again through being modulated on the radio frequency after the OFDM operation, wherein reverse rectification processing procedure and this process contrary are no longer too much given unnecessary details here.
Wherein above-mentioned in the middle of the OFDM operation, at first user data symbol to be carried out serial/parallel conversion, to form the sub data flow of a plurality of low rates, wherein each sub data flow takies a subcarrier, and the processing that each sub data flow is mapped on the corresponding subcarrier can be by reverse discrete Fourier transform (DFT) (IDFT, InverseDiscrete Fourier Transformation) or reverse fast fourier transform (IFFT, Inverse FastFourier Transformation) handle and to realize.Then by adding Cyclic Prefix (CP; Cyclic Prefix) time-domain signal that is treated to after IDFT or IFFT handle increases Cyclic Prefix (CP); with at interval as protection; can significantly reduce even eliminate intersymbol interference like this; and guaranteed the orthogonality of each interchannel, thereby significantly reduced the interference of interchannel.
At present, realize that on the OFDM multi-transceiver technology multimedia broadcast-multicast service (MBMS, Multimedia Broadcast/Multicast Service) is one of business important in the long-time evolution items tissue (LTE, Long-Time Evolution).Wherein the MBMS business mainly is meant the business that network side is broadcasted identical multi-medium data simultaneously or multicast is given a plurality of recipients in the network, and present multi-medium data mainly comprises some stream business and background (Background) business etc.
As mentioned above, in order to reduce the caused intersymbol interference of multidiameter delay, usually to adopt the method that increases CP in the time-domain signal after IDFT or IFFT processing to avoid, wherein the CP of Jia Ruing is long more, the intersymbol interference ability that the anti-multipath time delay causes is strong more, but long CP has also caused the problem that efficiency of transmission further reduces, so in the ofdm system of reality, the length that adds CP will be provided with different numerical value according to different application scenarioss.
Be divided into two kinds of short CP and long CP in the LTE project, the time span of its short-and-medium CP is T
CP≈ 4.7 μ s, it is mainly used under the non-broadcasting multicast service situation of (Unicast, Unicast mainly comprise some unicast services etc.); The time span of long CP is T
CP≈ 16.7 μ s, it is mainly used under the bigger situation of multimedia broadcast-multicast service (MBMS) and cell diameter.For the smaller sub-district of diameter, or that send when system is Unicast when professional, adopts short CP; And that send when system is MBMS when professional, or the diameter of sub-district just adopts long CP when bigger.
Generally, system carries out time division multiplexing (TDM with Unicast business and MBMS business, Time Division Multiple) sends after the processing, promptly on time shaft with some subframe (SBF, Sub-frame) transmit the MBMS business, and transmit the Unicast business with other subframe SBF.
Please refer to Fig. 2, this figure is the view that existing Unicast is professional and the MBMS business is carried out the time division multiplexing processing, the Unicast business is transmitted with short CP in the sub-district among the figure in subframe SBF0, SBF2, SBF3 and SBF6, and the relatively independent scheduling in the base station between each sub-district sends the Unicast business datum of oneself; And in subframe SBFl, SBF4 and SBF5, transmit the MBMS business with long CP, wherein each sub-district all sends identical MBMS business datum, user terminal (UE, User Equipment) demodulates the MBMS business datum that system sends according to corresponding control information, if UE is in the edge, sub-district, then can utilize the merging mode that a plurality of MBMS service signals that receive from a plurality of sub-districts are merged processing, improve the coverage rate at signal to noise ratio and edge, sub-district with this.
Based on above-mentioned Unicast business and MBMS business are carried out time-multiplexed mode, the multiplex mode of the professional and Unicast business of simultaneously multiplexing MBMS has been proposed again in the follow-up LTE project organization in same subframe SBF, to the MBMS professional and Unicast business of being defined as in same subframe is carried out the mode of frequency division multiplexing (FDM, Frequency Division Multiple).
Please refer to Fig. 3, this figure is just in and the view that MBMS business carry out frequency division multiplexing processing professional to Unicast in same subframe of conceptual phase in the LTE project organization, among the figure at subframe SBF2, SBF3, among SBF4 and the SBF5 Unicast business and MBMS business are carried out frequency division multiplexing, promptly at SBF2, SBF3, use different frequencies that Unicast business datum and MBMS business datum are carried transmission respectively among SBF4 and the SBF5, and have in the same subframe of Unicast business and MBMS business at frequency division multiplexing, the professional and MBMS business of Unicast is transmitted based on the CP of equal length in the sub-district.
Because the above-mentioned scheme that professional and MBMS business is carried out frequency division multiplexing to Unicast in same subframe still is in conceptual phase in the LTE project organization, therefore for the UE side, how demodulating Unicast business datum and the MBMS business datum of frequency division multiplexing in same subframe in the data message that system side issues, is an important problems.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of method and system thereof that reference signal is set for the multiplexing service data, insert suitable reference signal to be implemented in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged, the assisting users terminal is carried out demodulation respectively to different business data multiplexing in the subframe.
For addressing the above problem, the technical scheme that the present invention proposes is as follows:
A kind of for the multiplexing service data are provided with the method for reference signal, comprise step:
System is respectively first reference signal that each cell allocation is used for the channel that carries non-broadcast and multicast service data is carried out channel estimating, and is used for the channel of carrying broadcast and multicast service data is carried out second reference signal of channel estimating;
Each sub-district is inserted into first reference signal of system assignment respectively in the non-broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged; And
Second reference signal is inserted in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged, is handed down to user terminal.
Preferably, system distributes the first mutually orthogonal reference signal between the neighbor cell.
Preferably, system distributes the second identical reference signal between the neighbor cell.
Preferably, described method comprises that also each sub-district is inserted into first reference signal of system assignment the step in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged respectively.
Preferably, between the neighbor cell first reference signal of system assignment is inserted in the multiplexing broadcast and multicast service data subcarrier and non-broadcast and multicast service data subcarrier in same subframe in interlaced frequency division mode.
Preferably, between the neighbor cell first reference signal of system assignment is inserted in the non-broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged in interlaced frequency division mode.
Preferably, between the neighbor cell with first reference signal of system assignment with time/the frequency interleave mode is inserted in the non-broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged.
Preferably, each sub-district with second reference signal of system assignment with time/frequency interleave mode or dispersing mode be inserted in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged.
Preferably, described broadcast and multicast service data subcarrier and non-broadcast and multicast service data subcarrier are multiplexing in same subframe with frequency division multiplexing mode, time division multiplexing mode or dispersion multiplex mode.
Preferably, described broadcast and multicast service data subcarrier and non-broadcast and multicast service data subcarrier are multiplexing in same subframe in the frequency division multiplexing mode.
Preferably, described method also comprises step:
User terminal from multiplexing same subframe the broadcast and multicast service data subcarrier and non-broadcast and multicast service data subcarrier in obtain first reference signal and second reference signal of insertion respectively; And
Use first reference signal that the channel that carries non-broadcast and multicast service data is carried out channel estimation process, and use second reference signal that the channel that carries broadcast and multicast service data is carried out channel estimation process; And
Demodulate multiplexing non-broadcast and multicast service data and broadcast and multicast service data in same subframe respectively based on the channel estimation process result.
Preferably, described broadcasting multicast service is a multimedia broadcast-multicast service.
A kind of for the multiplexing service data are provided with the system of reference signal, comprising:
First allocation units are used to be respectively first reference signal that each cell allocation is used for the channel that carries non-broadcast and multicast service data is carried out channel estimating;
Second allocation units are used to be respectively second reference signal that each cell allocation is used for the channel of carrying broadcast and multicast service data is carried out channel estimating;
First reference signal is inserted the unit, is used for being handed down to user terminal in the non-broadcast and multicast service data subcarrier that first reference signal that each sub-district respectively will described first allocation units distribution is inserted into the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged; With
Second reference signal is inserted the unit, is used for being handed down to user terminal in the broadcast and multicast service data subcarrier that second reference signal that each sub-district respectively will described second allocation units distribution is inserted into the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged.
Preferably, described first allocation units are to distribute the first mutually orthogonal reference signal between the neighbor cell.
Preferably, described second allocation units are to distribute the second identical reference signal between the neighbor cell.
Preferably, described system also comprises the 3rd reference signal insertion unit, first reference signal that is used for respectively described first allocation units being distributed each sub-district is inserted in the broadcast and multicast service data subcarrier of the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged, and is handed down to user terminal.
The beneficial effect that the present invention can reach is as follows:
The present invention program is respectively first reference signal that each cell allocation is used for the channel that carries non-broadcast and multicast service data is carried out channel estimating by system, and is used for the channel of carrying broadcast and multicast service data is carried out second reference signal of channel estimating; Each sub-district is inserted into first reference signal and second reference signal of system assignment in the multiplexing broadcast and multicast service data subcarrier and non-broadcast and multicast service data subcarrier in same subframe respectively, is handed down to user terminal.Thereby the system that realized inserts suitable reference signal in the multiplexing same subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged, the purpose that multiplexing broadcast and multicast service data in same subframe that system is issued with the assisting users terminal UE and non-broadcast and multicast service data carry out demodulation respectively.
Simultaneously, the present invention program is respectively being used for of distributing between the adjacent sub-district by system, and the channel that carries non-broadcast and multicast service data to be carried out first reference signal of channel estimating mutually orthogonal, first reference signal that can avoid being used between the adjacent sub-district channel that carries non-broadcast and multicast service data to be carried out channel estimating produces the phase mutual interference, helps UE that multiplexing broadcast and multicast service data and non-broadcast and multicast service data in same subframe carried out demodulation accurately and effectively.
Description of drawings
Fig. 1 is for having the modulation and demodulation system processing procedure schematic diagram of basic ofdm system now;
The view that Fig. 2 is professional for existing Unicast and the MBMS business is carried out the time division multiplexing processing;
Fig. 3 in the LTE project organization just in and the view that MBMS business carry out frequency division multiplexing processing professional in same subframe of conceptual phase to Unicast;
Fig. 4 is provided with the main realization principle flow chart of the method for reference signal for the multiplexing service data for the present invention;
Fig. 5 is for being inserted into the Unicast reference signal of orthogonal thereto structure between the adjacent sub-district in all subcarriers in the subframe according to such scheme of the present invention, and the MBMS reference signal that is same structure between the adjacent sub-district is inserted into view in the MBMS subcarrier in the subframe;
Fig. 6 is for only being inserted into the Unicast reference signal of orthogonal thereto structure between the adjacent sub-district in the Unicast subcarrier in the subframe according to such scheme of the present invention, and the MBMS reference signal that is same structure between the adjacent sub-district is inserted into view in the MBMS subcarrier in the subframe;
Fig. 7 is the distribution schematic diagram of mutually orthogonal Unicast reference signal between the adjacent sub-district 1,2 and 3 in a subframe;
Fig. 8 is among first embodiment that implements based on the inventive method principle, the multiplexing view between MBMS reference signal and Unicast reference signal, MBMS subcarrier and the Unicast subcarrier;
Fig. 9 is among second embodiment that implements based on the inventive method principle, the multiplexing view between MBMS reference signal and Unicast reference signal, MBMS subcarrier and the Unicast subcarrier;
Figure 10 is among the 3rd embodiment that implements based on the inventive method principle, the multiplexing view between MBMS reference signal and Unicast reference signal, MBMS subcarrier and the Unicast subcarrier;
Figure 11 is among the 4th embodiment that implements based on the inventive method principle, the multiplexing view between MBMS reference signal and Unicast reference signal, MBMS subcarrier and the Unicast subcarrier;
Figure 12 is provided with the main composition structured flowchart of the system of reference signal for the multiplexing service data for the present invention.
Embodiment
The frequency division multiplexing MBMS business datum in same subframe that the present invention program is studying based on the present LTE project organization and the technical scheme of Unicast business datum, how to propose to multiplexing MBMS business datum and the Unicast business datum solution of carrying out reference signal design respectively in same subframe, so that the UE side can effectively demodulate multiplexing Unicast business datum and MBMS business datum in same subframe respectively.
Wherein in the LTE project organization, reference signal is defined as having following main effect:
1) is used to carry out cell identification process;
2) be used to carry out the sub-district hand-off process, and the measurement of Cell searching;
3) be used to carry out the measurement that channel quality is indicated (CQI, Channel Quality Indicator), and channel estimation process.
In the technical scheme that the present invention proposes, the main effect of reference signal is to be used for the channel of carrying broadcast and multicast service data is carried out channel estimation process, and is used for the channel that carries non-broadcast and multicast service data is carried out channel estimation process.Wherein the reference signal of carrying out channel estimation process with the channel of the carrying Unicast business datum of opposing can be defined as Unicast reference signal (promptly hereinafter first reference signal described in the scheme) here, is characterized in that the Unicast reference signal that adopts between the neighbor cell keeps quadrature; Wherein the reference signal of carrying out channel estimation process with the channel of the carrying MBMS business datum of opposing can be defined as MBMS reference signal (promptly hereinafter second reference signal described in the scheme) here, is characterized in that the MBMS reference signal that adopts between the neighbor cell is identical.
Be explained in detail below in conjunction with the main realization principle and the embodiment thereof of each accompanying drawing the present invention program.
Please refer to Fig. 4, this figure is the main realization principle flow chart of the present invention's method that reference signal is set for the multiplexing service data, and its main implementation procedure is as follows:
Step S10, system are respectively first reference signal that each cell allocation is used for the channel that carries non-broadcast and multicast service data is carried out channel estimation process; Wherein for to guarantee the accuracy of user terminal UE demodulating data, and avoid first reference signal between the adjacent sub-district to produce the phase mutual interference, system distributes the first mutually orthogonal reference signal between the neighbor cell.
Step S12, system are respectively second reference signal that each cell allocation is used for the channel of carrying broadcast and multicast service data is carried out channel estimation process; Wherein for guaranteeing the accuracy of UE demodulating data, system will be for distributing the second identical reference signal between the neighbor cell.
Step S14, each sub-district is inserted into first reference signal of system assignment respectively in the non-broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged, and then can also first reference signal be inserted in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged again; And simultaneously second reference signal is inserted in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged, be handed down to UE;
Step S16, UE from multiplexing same subframe the broadcast and multicast service data subcarrier and non-broadcast and multicast service data subcarrier in obtain first reference signal and second reference signal of insertion respectively;
Step S18, UE use first reference signal that the channel that carries non-broadcast and multicast service data is carried out channel estimation process;
Step S20, UE use second reference signal that the channel that carries broadcast and multicast service data is carried out channel estimation process;
Step S22, UE be based on the channel estimation process result in above-mentioned steps S18 and step S20, and the phase related control information that issues of coupling system, demodulates multiplexing non-broadcast and multicast service data and broadcast and multicast service data in same subframe respectively.
Wherein in above-mentioned steps S14, each sub-district can be respectively be inserted into first reference signal of system assignment in the multiplexing broadcast and multicast service data subcarrier and non-broadcast and multicast service data subcarrier in same subframe, and respectively second reference signal of system assignment is inserted in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged.
Please refer to Fig. 5, this figure is inserted into the Unicast reference signal of orthogonal thereto structure between the adjacent sub-district in all subcarriers in the subframe according to such scheme of the present invention, and the MBMS reference signal that is same structure between the adjacent sub-district is inserted into view in the MBMS subcarrier in the subframe, shown in the figure in the system, suppose sub-district 1, sub-district 2 and sub-district 3 are three adjacent sub-districts, wherein system is mutually orthogonal structure for the Unicast reference signal (being first reference signal in the such scheme) of these three cell allocation, it is sub-district 1, what the Unicast reference signal in sub-district 2 and the sub-district 3 adopted is the TF patterning of quadrature, to avoid the Unicast reference signal between the adjacent sub-district to produce the phase mutual interference, its Unicast reference signal can be carried out effective channel estimation process to all Unicast subcarriers.Simultaneously, system is that identical MBSM reference signal (being second reference signal in the such scheme) is inserted in sub-district 1, sub-district 2 and sub-district 3, it is sub-district 1, what the MBMS reference signal in sub-district 2 and the sub-district 3 adopted is same TF patterning, and its MBMS reference signal can be carried out effective channel estimation process to all MBMS subcarriers.
Based on above-mentioned Fig. 5, the Unicast reference signal of system assignment can be inserted in the multiplexing MBMS subcarrier and Unicast subcarrier in same subframe in interlaced frequency division mode between the neighbor cell; And with the MBMS reference signal of system assignment with time/the frequency interleave mode, perhaps dispersing mode (Scattered) is inserted in the MBMS subcarrier in the subframe of the multiplexing MBMS of having business datum and Unicast business datum.Based on these a little situations, Unicast business datum and MBMS business datum (a kind of situation of broadcast and multicast service data) can be selected with frequency division multiplexing mode, time division multiplexing mode or disperse multiplex mode (Scattered) multiplexing in same subframe.Wherein the multiplex mode of the multiplex mode of above-mentioned each business datum and corresponding each reference signal will be described in detail respectively in following embodiment 1 and embodiment 2.
Among this external above-mentioned steps S14, each sub-district can also be respectively only be inserted into first reference signal of system assignment in the non-broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged, respectively second reference signal of system assignment is inserted into simultaneously in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged.
Please refer to Fig. 6, this figure only is inserted into the Unicast reference signal of orthogonal thereto structure between the adjacent sub-district in the Unicast subcarrier in the subframe according to such scheme of the present invention, and the MBMS reference signal that is same structure between the adjacent sub-district is inserted into view in the MBMS subcarrier in the subframe, shown in the figure in the system, suppose sub-district 1, sub-district 2 and sub-district 3 are three adjacent sub-districts, wherein system is mutually orthogonal structure for the Unicast reference signal (being first reference signal in the such scheme) of these three cell allocation, it is sub-district 1, what the Unicast reference signal in sub-district 2 and the sub-district 3 adopted is the TF patterning of quadrature, to avoid the Unicast reference signal between the adjacent sub-district to produce the phase mutual interference, but each sub-district only is arranged on the Unicast reference signal of system assignment on the Unicast subcarrier in the subframe of the multiplexing Unicast of having business datum and MBMS business datum simultaneously, on the MBMS of correspondence subcarrier, be not provided with the Unicast reference signal (this point be with above-mentioned Fig. 5 scheme in the difference part), its Unicast reference signal can be carried out effective channel estimation process to all Unicast subcarriers.Simultaneously, system is that identical MBSM reference signal (being second reference signal in the such scheme) is inserted in sub-district 1, sub-district 2 and sub-district 3, it is sub-district 1, what the MBMS reference signal in sub-district 2 and the sub-district 3 adopted is same TF patterning, and its MBMS reference signal can be carried out effective channel estimation process to all MBMS subcarriers.
Based on above-mentioned Fig. 6, can be between the neighbor cell with the Unicast reference signal of system assignment in interlaced frequency division mode or be inserted in the mode of time/frequency interleave in the Unicast subcarrier in the subframe of the multiplexing MBMS of having business datum and Unicast business datum; And with the MBMS reference signal of system assignment with time/frequency interleave mode or dispersing mode (Scattered) be inserted in the MBMS subcarrier in the subframe of the multiplexing MBMS of having business datum and Unicast business datum.Based on these a little situations, Unicast business datum and MBMS business datum (a kind of situation of broadcast and multicast service data) will be selected in the frequency division multiplexing mode multiplexing in same subframe.Wherein the multiplex mode of the multiplex mode of above-mentioned each business datum and corresponding each reference signal will be described in detail respectively in following embodiment 3 and embodiment 4.
Below will based on the above-mentioned proposition of the present invention for the multiplexing service data are provided with the method principle of reference signal, enumerate several specific embodiments and be elaborated, and suppose that each specific embodiment implements in each parameter environment of following table:
Table 1: parametric assumption
| Transmission bandwidth | 5MHz |
| The subframe time span | 0.5ms |
| The bandwidth of each subcarrier | 15kHz |
| The FFT transform size | 512 |
| Useful subcarrier number | 300 |
| The Unicast reference signal takies the number of subcarrier | 75 |
| Unicast reference signal distribution patterns | Frequency division mode (following Fig. 7 signal) |
| The Unicast reference signal orthogonal manner of adjacent minizone | Stagger not overlapping (following Fig. 7 signal) mutually |
Please refer to Fig. 7, this figure is the distribution schematic diagram of mutually orthogonal Unicast reference signal between the adjacent sub-district 1,2 and 3 in a subframe, mutually orthogonal Unicast reference signal adopts the frequency division mode separately in same subframe between the wherein adjacent sub-district 1,2 and 3, and the Unicast reference signal between each adjacent sub-district staggers non-overlapping copies mutually.
Please refer to Fig. 8, this figure is based among first embodiment of the inventive method principle enforcement, MBMS reference signal and Unicast reference signal, multiplexing view between MBMS subcarrier and the Unicast subcarrier, in the same subframe in the present embodiment, adjacent sub-district 1, keep the Unicast reference signal distribution among above-mentioned Fig. 7 constant between 2 and 3, the multiplex mode of MBMS business datum and Unicast business datum is to disperse multiplex mode (Scattered, be also referred to as the frequency hopping multiplex mode), the MBMS reference signal adopt time/the frequency interleave mode distributes, its specific implementation process is as follows:
(1) begin in each subframe, sub-district 1, sub-district 2 and sub-district 3 (each sub-district of following abbreviation) are placed separately Unicast reference signal respectively according to above-mentioned state shown in Figure 7 respectively, and scheduling Unicast business datum separately is to the Unicast subcarrier.
(2) each sub-district is placed the MBMS reference signal respectively according to MBMS reference signal position shown in Figure 8, and scheduling corresponding M BMS business datum is to the MBMS subcarrier.
(3) business datum of each sub-district after with above-mentioned multiplexing process utilizes transmitter to launch after ovennodulation.
(4) after UE receives the business datum of multiplexing process, obtain the Unicast reference signal of self sub-district, place, carry out channel estimation process with channel, and the phase related control information that utilizes channel estimation process result and system to issue demodulates the Unicast business datum in the subframe of the multiplexing MBMS of having business datum and Unicast business datum to carrying Unicast business datum.
(5) after UE receives the business datum of multiplexing process, obtain the MBMS reference signal of self sub-district, place, carry out channel estimation process with channel, and the phase related control information that utilizes channel estimation process result and system to issue demodulates the MBMS business datum in the subframe of the multiplexing MBMS of having business datum and Unicast business datum to carrying MBMS business datum.
Please refer to Fig. 9, this figure is based among second embodiment of the inventive method principle enforcement, MBMS reference signal and Unicast reference signal, multiplexing view between MBMS subcarrier and the Unicast subcarrier, in the same subframe in the present embodiment, adjacent sub-district 1, keep the Unicast reference signal distribution among above-mentioned Fig. 7 constant between 2 and 3, the multiplex mode of MBMS business datum and Unicast business datum is time division multiplexing mode (TDM), the MBMS reference signal adopts dispersing mode (Scattered) to distribute, and suppose that this distributed locations sequence all knows in advance in system side and UE side, its specific implementation process is similar with the implementation process among above-mentioned first embodiment, just in step (2) each sub-district according to MBMS reference signal position shown in Figure 9, place the MBMS reference signal respectively, and scheduling corresponding M BMS business datum is to the MBMS subcarrier, other processes are identical, just no longer too much give unnecessary details here.
Please refer to Figure 10, this figure is based among the 3rd embodiment of the inventive method principle enforcement, MBMS reference signal and Unicast reference signal, multiplexing view between MBMS subcarrier and the Unicast subcarrier, in the same subframe in the present embodiment, adjacent sub-district 1,2 and 3 guarantee to insert corresponding Unicast reference signal on the Unicast subcarrier, and make the distribution of Unicast reference signal such as the distribution among above-mentioned Fig. 7, the multiplex mode of MBMS business datum and Unicast business datum is frequency division multiplexing mode (FDM), the MBMS reference signal adopts dispersing mode (Scattered) to distribute, and suppose that this distributed locations sequence knows in advance all that in system side and UE side its specific implementation process is as follows:
(11) begin in each subframe, sub-district 1, sub-district 2 and sub-district 3 (each sub-district of following abbreviation) are respectively according to the Unicast number of sub carrier wave that is occupied separately, on the Unicast of correspondence subcarrier, place separately Unicast reference signal respectively, and scheduling Unicast business datum separately is to the Unicast subcarrier according to above-mentioned state shown in Figure 7.
(12) each sub-district is according to the distributed locations sequence (the distributed locations sequence of supposing this MBMS reference signal is all known in advance in system side and UE side) of MBMS reference signal shown in Figure 10, place the MBMS reference signal respectively, and scheduling corresponding M BMS business datum is to the MBMS subcarrier.
The subsequent implementation process, is no longer too much given unnecessary details to step (5) here with the step (3) among above-mentioned first embodiment.
Please refer to Figure 11, this figure is based among the 4th embodiment of the inventive method principle enforcement, MBMS reference signal and Unicast reference signal, multiplexing view between MBMS subcarrier and the Unicast subcarrier, include 12 symbols in the same subframe in the present embodiment, be referred to as eldest son's frame, adjacent sub-district 1,2 and 3 guarantee to insert corresponding Unicast reference signal on the Unicast subcarrier, between the Unicast reference signal according to time/the frequency interleave mode distributes, inequality with the distributing position state of Unicast reference signal among above-mentioned Fig. 7, and the distributing position state of hypothesis Unicast reference signal is known in advance in system side and UE side; The multiplex mode of MBMS business datum and Unicast business datum is frequency division multiplexing mode (FDM), the MBMS reference signal adopt time/frequency interleave mode (Scattered) distributes, and suppose this time/the frequency interleave sequence knows in advance all that in system side and UE side its specific implementation process is as follows:
(21) begin in each subframe, sub-district 1, sub-district 2 and sub-district 3 (each sub-district of following abbreviation) are respectively according to the Unicast number of sub carrier wave that is occupied separately, on the Unicast of correspondence subcarrier according to sub-district and UE all know in advance time/the frequency interleave mode places Unicast reference signal separately respectively, and scheduling Unicast business datum separately is to the Unicast subcarrier.
(22) each sub-district according to MBMS reference signal shown in Figure 11 time/the frequency interleave position sequence (suppose this MBMS reference signal time/the frequency interleave position sequence all knows in advance in system side and UE side), place the MBMS reference signal respectively, and scheduling corresponding M BMS business datum is to the MBMS subcarrier.
The subsequent implementation process, is no longer too much given unnecessary details to step (5) here with the step (3) among above-mentioned first embodiment.
As fully visible, the method principle of reference signal is set based on what the present invention proposed for the multiplexing service data, can be so that effective multiplexing broadcast and multicast service data (as the MBMS business datum) and the non-broadcast and multicast service data (as the Unicast business datum) in same subframe that issue of the system of demodulating of UE, thus solve and technical problem that the perfect LTE project organization is run into.
The method principle of reference signal is set corresponding to above-mentioned proposition for the multiplexing service data, the present invention has also proposed a kind of system that reference signal is set for the multiplexing service data here, please refer to Figure 12, this figure is the main composition structured flowchart of the present invention system that reference signal is set for the multiplexing service data, it comprises that mainly first allocation units 10, second allocation units 20, first reference signal are inserted unit 30 and second reference signal is inserted unit 40, and wherein the main effect of each part is as follows:
First reference signal is inserted unit 30, is mainly used in first reference signal that each sub-district respectively will 10 distribution of above-mentioned first allocation units and is inserted in the non-broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged;
Second reference signal is inserted unit 40, is mainly used in second reference signal that each sub-district respectively will 20 distribution of above-mentioned second allocation units and is inserted in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged.
The 3rd reference signal is inserted unit 50, is mainly used in first reference signal that each sub-district respectively will 10 distribution of above-mentioned first allocation units and is inserted in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged.
About the other technologies in the system of the present invention realize that details is same or similar with the corresponding technology realization details in the said method of the present invention, please specifically realize details, in the concrete elaboration of system of the present invention, will no longer too much give unnecessary details here with reference to the correlation technique in the said method.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (16)
1, a kind ofly it is characterized in that, comprise step for the multiplexing service data are provided with the method for reference signal:
System is respectively first reference signal that each cell allocation is used for the channel that carries non-broadcast and multicast service data is carried out channel estimating, and is used for the channel of carrying broadcast and multicast service data is carried out second reference signal of channel estimating;
Each sub-district is inserted into first reference signal of system assignment respectively in the non-broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged, and
Second reference signal is inserted in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged, is handed down to user terminal.
2, the method for claim 1 is characterized in that, system distributes the first mutually orthogonal reference signal between the neighbor cell.
3, the method for claim 1 is characterized in that, system distributes the second identical reference signal between the neighbor cell.
4, the method for claim 1, it is characterized in that, comprise that also each sub-district is inserted into first reference signal of system assignment the step in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged respectively.
5, method as claimed in claim 4, it is characterized in that first reference signal with system assignment between the neighbor cell is inserted in the multiplexing broadcast and multicast service data subcarrier and non-broadcast and multicast service data subcarrier in same subframe in interlaced frequency division mode.
6, the method for claim 1, it is characterized in that, between the neighbor cell first reference signal of system assignment is inserted in the non-broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged in interlaced frequency division mode.
7, the method for claim 1, it is characterized in that, between the neighbor cell with first reference signal of system assignment with time/the frequency interleave mode is inserted in the non-broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged.
8, the method for claim 1, it is characterized in that, each sub-district with second reference signal of system assignment with time/frequency interleave mode or dispersing mode be inserted in the broadcast and multicast service data subcarrier in the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged.
9, method as claimed in claim 4 is characterized in that, described broadcast and multicast service data subcarrier and non-broadcast and multicast service data subcarrier are with frequency division multiplexing mode, time division multiplexing mode or disperse multiplex mode multiplexing in same subframe.
10, the method for claim 1 is characterized in that, described broadcast and multicast service data subcarrier and non-broadcast and multicast service data subcarrier are multiplexing in same subframe in the frequency division multiplexing mode.
11, as the described method of 1～10 any claim, it is characterized in that, also comprise step:
User terminal from multiplexing same subframe the broadcast and multicast service data subcarrier and non-broadcast and multicast service data subcarrier in obtain first reference signal and second reference signal of insertion respectively; And
Use first reference signal that the channel that carries non-broadcast and multicast service data is carried out channel estimation process, and use second reference signal that the channel that carries broadcast and multicast service data is carried out channel estimation process; And
Demodulate multiplexing non-broadcast and multicast service data and broadcast and multicast service data in same subframe respectively based on the channel estimation process result.
12, method as claimed in claim 11 is characterized in that, described broadcasting multicast service is a multimedia broadcast-multicast service.
13, a kind ofly it is characterized in that, comprising for the multiplexing service data are provided with the system of reference signal:
First allocation units are used to be respectively first reference signal that each cell allocation is used for the channel that carries non-broadcast and multicast service data is carried out channel estimating;
Second allocation units are used to be respectively second reference signal that each cell allocation is used for the channel of carrying broadcast and multicast service data is carried out channel estimating;
First reference signal is inserted the unit, is used for being handed down to user terminal in the non-broadcast and multicast service data subcarrier that first reference signal that each sub-district respectively will described first allocation units distribution is inserted into the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged; With
Second reference signal is inserted the unit, is used for being handed down to user terminal in the broadcast and multicast service data subcarrier that second reference signal that each sub-district respectively will described second allocation units distribution is inserted into the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged.
14, system as claimed in claim 13 is characterized in that, described first allocation units are to distribute the first mutually orthogonal reference signal between the neighbor cell.
15, system as claimed in claim 13 is characterized in that, described second allocation units are to distribute the second identical reference signal between the neighbor cell.
16, system as claimed in claim 13, it is characterized in that, also comprise the 3rd reference signal insertion unit, first reference signal that is used for respectively described first allocation units being distributed each sub-district is inserted in the broadcast and multicast service data subcarrier of the multiplexing subframe that broadcast and multicast service data and non-broadcast and multicast service data arranged, and is handed down to user terminal.
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| WO2009092305A1 (en) * | 2008-01-14 | 2009-07-30 | Huawei Technologies Co., Ltd. | Method, apparatus and system for distinguishing states of sub-frames in a cell |
| WO2009132531A1 (en) * | 2008-03-14 | 2009-11-05 | 中兴通讯股份有限公司 | Method and device for indicating and obtaining the attributes of sub-frames in long term evolution network |
| CN101841357A (en) * | 2009-03-16 | 2010-09-22 | 夏普株式会社 | Downlink data transmission method, base station and user equipment |
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| GB0400255D0 (en) * | 2004-01-07 | 2004-02-11 | Samsung Electronics Co Ltd | Radio messages |
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| CN101389050B (en) * | 2007-09-14 | 2011-11-16 | 展讯通信（上海）有限公司 | Information sending and receiving method using reference symbol configuration change in single frequency network |
| WO2009092305A1 (en) * | 2008-01-14 | 2009-07-30 | Huawei Technologies Co., Ltd. | Method, apparatus and system for distinguishing states of sub-frames in a cell |
| CN101489184B (en) * | 2008-01-14 | 2010-12-08 | 华为技术有限公司 | Method, apparatus and system for differentiating intra-district sub-frame state |
| WO2009132531A1 (en) * | 2008-03-14 | 2009-11-05 | 中兴通讯股份有限公司 | Method and device for indicating and obtaining the attributes of sub-frames in long term evolution network |
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| CN101841357B (en) * | 2009-03-16 | 2014-06-11 | 夏普株式会社 | Downlink data transmission method, base station and user equipment |
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