CN101043492A - Method and apparatus for distributing OFDM physical channel resources - Google Patents
Method and apparatus for distributing OFDM physical channel resources Download PDFInfo
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- CN101043492A CN101043492A CN 200610064987 CN200610064987A CN101043492A CN 101043492 A CN101043492 A CN 101043492A CN 200610064987 CN200610064987 CN 200610064987 CN 200610064987 A CN200610064987 A CN 200610064987A CN 101043492 A CN101043492 A CN 101043492A
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Abstract
The disclosed OFDM physical channel resource allocation method comprises: in one transmission frame, selecting sub-carriers with fixed number distributed on every OFDM code to form a DRCH, and using other sub-carrier in same frame to form LRCH; then, according to user data for transmitting, selecting proper transmission method to correlate user data with LRCH or DRCH, and mapping data to the corresponding sub-carrier of OFDM code. This invention reduces scheduling complexity, and improves frequency diversity capacity.
Description
Technical field
The present invention relates to orthogonal frequency utilization (OFDM) technology of the communications field, relate in particular to OFDM physical channel resources distribution method and device thereof.
Background technology
OFDM (OFDM) is a kind of multi-carrier transmission technology, and this technology is divided into many subcarriers with frequency spectrum, and each subcarrier is modulated according to speed with lower speed.By distributing different subcarriers, can realize that the multiple access of OFDM inserts, i.e. OFDMA to different users.Each narrow-band sub-carriers adopts different modulation systems, and for example QAM16, QAM8 etc. adopt contrary fast fourier transform (IFFT) that OFDM is provided modulation then.Need the data of transmission to be mapped on the symbol of OFDM,, add Cyclic Prefix, send through behind the IFFT.Receiving terminal utilizes FFT to solve the OFDM symbol, takes out the data that are mapped to this symbol.
In current technology, the mode that physical channel resources is distributed mainly contains two kinds.A kind of is that concentrate to distribute mode, the another kind of (localized) be discrete (distributed) mode of distributing.
Concentrated mode of distributing is divided into some subbands with whole frequency as shown in Figure 1.Each subband is made up of continuous sub-carriers.The base station is according to the channel quality information (CQI) of each subband of user feedback, on the temporal frequency face, is that unit distributes to the user with the subband with the resource of physical channel.Under this mode, user by selecting and scheduling can be avoided the frequency band of deep fade, effectively contrary frequency selectivity decline.So, concentrate the mode of distributing that higher efficiency of transmission is arranged.But, concentrate the mode of distributing to need the CQI feedback of each subband, the duty ratio of reverse control channel is bigger.And for the user of high-speed motion, because variations is too fast, the CQI that feeds back can not react current channel quality.So concentrate the mode of distributing only to be suitable for low speed user.
Discrete mode of distributing as shown in Figure 2, each user's data is dispersed on the whole temporal frequency face.For the discrete method of salary distribution, as long as the CQI that whole frequency band is average is known in the base station, so the load of based on feedback link is less.Be suitable for the less data service of packet, as speech business etc.Because data are dispersed on the whole frequency band, the therefore discrete method of salary distribution has the diversity gain on the frequency, and it is applicable to high-speed motion and Common Control Channel etc., but the efficient of its transmission is not as the centralized distribution pattern height.
As seen, above-mentioned dual mode respectively has pluses and minuses, wants to make full use of channel resource, must consider the multiplexing of dual mode.
In the prior art the multiplexing scheme of a kind of centralized distribution pattern and the discrete method of salary distribution as shown in Figure 3,1 subframe (subframe) of having drawn among Fig. 3 is made up of 7 symbols (pane) on time orientation, the allocation step of single subframe is:
Give earlier concentrate the user resource allocation that distributes (as the concentrated user among the figure 1,2,3,4 ..., 12), the discrete then user (as the concentrated user 1 and 2 among the figure) who distributes redistributes in concentrating the resource of having distributed, override and distribute to the unit of concentrating mapping originally, be called " punching ".In Fig. 3, the discrete user who distributes, Frequency Distribution is mode (being frequency hopping pattern) over time.
It is fixing to distribute to the data volume (slash pane) that each subband (as uppermost slash bulk) of concentrating distributing user comprises among Fig. 3, can change with the number change of discrete " punching " that distributes, thereby increases the complexity of dispatching greatly.Because the upper strata is distributed the packets need of getting off to reconfigure to cut apart and can be shone upon distribution, to be fit to different variations of concentrating the size of allocation blocks.And the ration of division of each subframe is all different, needs to determine through calculating.
Secondly, among Fig. 3, concentrate the user who distributes to know that when the receiving demodulation data which has been accounted for by the discrete user who distributes in the piece that oneself distributes.Like this, just this information need be notified the user who concentrates distribution in forward control channel, thereby increased the load of forward control channel.
The multiplexing scheme of the another kind of centralized distribution pattern and the discrete method of salary distribution uniformly-spaced is divided into the whole frequency band resource and concentrates map section and Discrete Mapping district two parts as shown in Figure 4 in the prior art.Concentrate the resource of mapping part to feed back according to CQI, the user who concentrates mapping is distributed in scheduling.User's method of salary distribution of Discrete Mapping is shown in discrete user 1 and discrete user 2 among the figure.On frequency, disperse to distribute, do not change in time.This scheme has the following disadvantages:
1, the user who has 50% frequency band to be concentrated to distribute monopolizes, and the discrete user who distributes can't that is to say with Frequency Distribution on these frequencies, can't be in the enterprising line frequency diversity of these frequencies.
2, because the discrete degree of scatter of distribution portion on the temporal frequency face is not high enough, the mode of dispersion is too single.Frequency as discrete user's 1 correspondence did not change in the time, made the probability that interferes with each other of the minizone in the wireless communication system increase.
3, concentrate the resource allocation ratio of distributing user and discrete distributing user too fixing.And in the reality, concentrate the user and the discrete user's data amount of distributing of distributing often uneven.Such as, the user of low-speed motion often more than the user of high-speed motion, if adopt this method of salary distribution regularly, just is easy to cause the waste greatly of physical channel resources, and this is not that system design is desirable.
4, (in Fig. 4, concentrating user 1 to be made up of 12 * 7 lattices, is the scheduling granularity of concentrating distribution to concentrate the scheduling granule size of distribution identical with the discrete scheduling granule size that distributes.And discrete user 1 also is made up of 12 * 7 lattices, is discrete scheduling granularity of distributing).Be unfavorable for the distribution of different business like this.In the reality, discrete minimum particle size (considering the less business of packet such as the voice) ratio that needs that distributes concentrates the minimum particle size of distributing much smaller.
In a word, adopt existing scheme, exist the ability and the data block of scheduling and multiplexing signaling complexity, anti-presence of intercell interference ability, frequency diversity to cut apart problems such as complexity.
Summary of the invention
The invention provides a kind of OFDM physical channel resources distribution method, to solve the problem that has scheduling complexity and frequency diversity ability in the prior art.
The invention provides a kind of method and device that sends data and receive data, exist scheduling and multiplexing signaling complexity, anti-presence of intercell interference ability and data block to cut apart complicated problems in the prior art to solve.
The invention provides following technical scheme:
A kind of OFDM physical channel resource allocation methods comprises step:
Definition is formed discrete channel resource DRCH by the subcarrier that is dispersed in the fixed number on each orthogonal frequency division multiplex OFDM code element in a transmission frame, forms pooling of resources channel LRCH by all the other subcarriers in this transmission frame; And
The transmission means of transmitting users data adapting is associated with LRCH or DRCH with user data as required, and with data map on corresponding sub-carrier of OFDM code.
In preferable mode, channel resource has following feature:
In a transmission frame, form a plurality of DRCH and a plurality of LRCH, respectively by corresponding index sign.
Make the number of sub carrier wave of forming DRCH on each OFDM code element identical and fixing; The subcarrier spacing of forming DRCH on each OFDM code element is distributed on the whole frequency domain; The subcarrier of forming DRCH on each OFDM code element is spacedly distributed on whole frequency domain.
In each subband that is made of a plurality of continuous subcarriers, the number of sub carrier wave that DRCH takies is identical.
On different OFDM code elements, form the frequency generation saltus step of the subcarrier of DRCH; The pattern of frequency hopping generates by frequency hop sequences; Different frequency hop sequences is chosen by the minimum principle of frequency collision in each sub-district.
The number of sub carrier wave that the number of sub carrier wave that LRCH comprises comprises more than or equal to DRCH, and be the sub-carrier number purpose integral multiple that DRCH comprises.
A kind of method that sends data comprises step:
To need the transmitting users data to be associated with corresponding channel resource, this channel resource comprises by the subcarrier that is dispersed in the fixed number on each orthogonal frequency division multiplex OFDM code element in the transmission frame forms discrete channel resource DRCH, and forms pooling of resources channel LRCH by all the other subcarriers in this frame;
Data are carried out coded modulation generate modulation symbol, and be mapped on the corresponding sub-carrier of OFDM code;
Subcarrier is carried out contrary fast fourier transform handle and send the OFDM code element.
In preferable mode, when data are associated with channel resource, further according to DRCH and LRCH needs present frame data quantity transmitted size, select corresponding multiplexer mode, the number of sub carrier wave that each DRCH between wherein different multiplexer modes and LRCH comprise is that DRCH minimum in all multiplexer modes comprises sub-carrier number purpose integral multiple.
A kind of method that receives data comprises step:
Receive the OFDM code element of a Frame, and the control information of obtaining channel resource from control channel, this channel resource comprises by the subcarrier that is dispersed in the fixed number on each orthogonal frequency division multiplex OFDM code element in the transmission frame forms discrete channel resource DRCH, and forms pooling of resources channel LRCH by all the other subcarriers in this frame;
Described OFDM sign indicating number is carried out fast fourier transform, recover the subcarrier on DRCH each OFDM code element related with LRCH;
Extract modulation symbol from subcarrier, and to modulating symbol demodulation and decoding to recover data.
A kind of emitter comprises:
Be used for and need the transmitting users data to be associated with corresponding channel resource, this channel resource comprises by the subcarrier that is dispersed in the fixed number on each orthogonal frequency division multiplex OFDM code element in the transmission frame forms discrete channel resource DRCH, and the unit of being made of pooling of resources channel LRCH all the other subcarriers in this frame;
Data are carried out coded modulation generate modulation symbol, and be mapped to the unit on the corresponding sub-carrier of OFDM code;
Subcarrier is carried out the unit that the OFDM code element was handled and sent to contrary fast fourier transform.
A kind of receiving system comprises:
The OFDM code element that is used for receiving data frames, and the control information of obtaining channel resource from control channel, this channel resource comprises by the subcarrier that is dispersed in the fixed number on each orthogonal frequency division multiplex OFDM code element in the transmission frame forms discrete channel resource DRCH, and the unit of being made of pooling of resources channel LRCH all the other subcarriers in this frame;
Be used for described OFDM sign indicating number is carried out fast fourier transform, recover the unit of the subcarrier on DRCH each OFDM code element related with LRCH;
Be used for extracting modulation symbol from subcarrier, and to modulating symbol demodulation and decoding to recover the unit of data.
Beneficial effect of the present invention is as follows:
1, in the present invention, has just decided in agreement the position of the part that has been accounted for by the user that disperse, does not need the extra signaling to notify, and therefore, distributes the control signaling less, dispatch and multiplexing signaling simple; And in the prior art, DRCH user need know which the part punched by LRCH user, the more signaling of this informational needs is come informing user terminal.
2, because the number of sub carrier wave in the frame that each DRCH comprises is whole minute several times of sub-carrier number purpose that each LRCH comprises, greatly facilitate the definition of upper layer logic packet size like this, and the complexity when cutting apart the logical data bag when having reduced scheduling and being the physical data bag;
3, the subcarrier that is associated of DRCH is evenly distributed in the whole temporal frequency face.Such uniformity has not only made things convenient for the design of frequency hopping pattern, and the user who helps DRCH transmission obtains the complete diversity on the whole temporal frequency domain.
4, the number of sub carrier wave that comprises of each DRCH is littler than the number of sub carrier wave that each LRCH comprises, and it is little to help being fit to packet like this, requires the cutting apart of logical data bag of the little business of time delay (as the VOIP business etc.).Because the CQI of each LRCH and each subband is associated, if with subband cut apart less, then sub band number is more, thereby needs the CQI number of feedback more, can increase the load of based on feedback link so greatly.So, adopt DRCH to come to be associated more real with the small data packets real time business;
5, DRCH frequency hopping on whole frequency, the good frequency hop sequences of application performance easily is such as RS sequence, Latin sequence etc.Different RS sequence or Latin sequence are adopted in different sub-districts, can obtain the average effect of fine presence of intercell interference, thereby improve the user's of cell edge frequency repeat utilization ratio.
6, use simple mode to coordinate the ratio problems of the traffic carrying capacity that DRCH and LRCH be associated.Can change both ratios in the present invention by preference pattern, method is simple and practical, and does not need to increase any additional signaling.In the prior art, the fixed ratio of the total number of sub-carriers that is associated of the total number of sub-carriers that is associated with all DRCH and all LRCH is 1: 1.And in practice, both ratio datas change often, and in most cases, the user of the unnecessary high-speed motion of user of low-speed motion, thus be fixed as 1: 1st, improper.
Description of drawings
Fig. 1 is at the schematic diagram of T/F face upper signal channel resource centralized distribution pattern in the prior art;
Fig. 2 is at the schematic diagram of the discrete method of salary distribution of T/F face upper signal channel resource in the prior art;
Fig. 3 be prior art on the T/F face, channel resource concentrate to distribute and discrete assigning process in adopt the schematic diagram of coverage mode Resources allocation;
Fig. 4 be prior art on the T/F face, channel resource concentrate to distribute and discrete assigning process in adopt the schematic diagram of fixed form Resources allocation;
Fig. 5 is the structural representation of transmitter in the individual antenna system in the embodiment of the invention;
Fig. 6 is the structural representation of receiver in the individual antenna system in the embodiment of the invention;
Fig. 7 is the flow chart that sends data in the embodiment of the invention;
Fig. 8 is the flow chart that receives data in the embodiment of the invention;
Fig. 9 A, Fig. 9 B are respectively in the embodiment of the invention pattern 1 and pattern 2 times, at the schematic diagram of T/F face upper signal channel resource allocation.
Embodiment
Under multi-user orthogonal frequency division multiplexing inserted (OFDMA) environment, Frame was the codec data piece of the minimum that is used for transmitting, is made up of several orthogonal frequency division multiplexing (OFDM) code element usually.For the user of transmitting different motion speed efficiently, the data of different service types, each user data and channel resource (RCH) are associated, RCH is made up of the experimental process carrier wave on a plurality of OFDM code elements on the Frame.RCH is divided into two kinds according to the correlation between the subcarrier of forming: pooling of resources channel (LRCH) and discrete channel resource (DRCH).
In the present invention, LRCH is made up of the continuous subcarrier of a frame internal fixation number.According to the frequency domain correlation between subcarrier, in a Frame, the continuous plurality of sub carrier wave of whole frequency band is divided into group, and each group is called subband.In each subband except being occupied by DRCH, the corresponding LRCH of other sub carrier group.DRCH is made up of the subcarrier of the fixed number on the different OFDM code elements that are dispersed in the frame.When the emission user data, according to the suitable transmission means of user data, promptly be that concentrated allocation of channel resources may mode is transmitted or discrete allocation of channel resources may mode is transmitted, user data is associated with LRCH or DRCH, then by existing mode with data map on corresponding sub-carrier of OFDM code.
For the user who helps DRCH transmission obtains complete diversity on the whole temporal frequency domain, form the subcarrier of DRCH, on fixed number on each OFDM code element and the whole frequency domain of distribution at interval; Preferable mode is to be spacedly distributed.
In order to obtain better presence of intercell interference average effect, improve the user's of cell edge frequency repeat utilization ratio, form the frequency generation saltus step of subcarrier on different OFDM code elements of DRCH, the pattern of frequency hopping can be generated by traditional frequency hop sequences, as RS sequence, Latin sequence etc.Each sub-district adopts the different principles by frequency collision minimum to choose frequency hop sequences, and each DRCH can be discerned by the frequency-hopping mode on the different OFDM code elements.
The number of sub carrier wave that the number of sub carrier wave that LRCH comprises and DRCH comprise is decided before communication system is set up.In the present embodiment, get the number of sub carrier wave that number that DRCH comprises subcarrier comprises smaller or equal to LRCH, and be whole minute several times of LRCH sub-carrier number purpose, promptly the subcarrier that comprises of LRCH is the integral multiple of the subcarrier that comprises of DRCH.This point can realize by the number of sub carrier wave on each OFDM code element by DRCH and LRCH, if make LRCH and the son that on each OFDM code element, comprises to carry number be that DRCH comprises sub-carrier number purpose multiple.And the packet size of the low rate real time business that number of sub carrier wave that DRCH comprises and communication system will be served interrelates, as the packet size of VOIP.
Comprise a plurality of DRCH and a plurality of LRCH in the frame, their number is fixed up before system sets up, and by DRCH index and LRCH index sign, index information is notified portable terminal by Common Control Channel respectively.The subcarrier of distributing to these DRCH is evenly distributed on the frequency domain as far as possible, and guarantees that in each subband, the number of sub carrier wave that is occupied by these DRCH is identical.
According to the sub-carrier number purpose different proportion of DRCH that comprises in the frame and LRCH, before setting up, system is preset as different multiplexer modes.The number of multiplexer mode is determined before system sets up according to the flexibility of system requirements and the complexity of scheduling.Number is many more, and flexibility is also high more, and the complexity of cutting apart LRCH logical data bag during scheduling is also high more.The classification of pattern can be identified by the number of the DRCH in the frame, decides before system sets up, owing to the index information of DRCH is propagated on common signal channel, so the increase pattern does not need to increase signaling especially.The number of sub carrier wave that each DRCH between different multiplexer modes and LRCH comprise is the integral multiple of the DRCH of minimum in all patterns.
Consult shown in Figure 5ly, the transmitter in the individual antenna system comprises: coding unit 11, modulating unit 12, map unit 13, IFFT IFFT unit 14 and antenna 20 (not shown all processing units).Coding unit 11 is used for packet is carried out encoding process; Modulating unit 12 is used for data behind the modulating-coding to generate the modulation symbol bag; Map unit 13 is used for the subcarrier of the sign map in the modulation symbol bag to the OFDM code element; IFFT unit 14 is used for the associated data on each OFDM code element is done contrary discrete fast Fourier transform, obtains the OFDM code element of time domain; Antenna 20 is used to launch the OFDM code element.
Consult shown in Figure 6ly, the receiver in the individual antenna system comprises: antenna 40, unit 32, demodulation unit 33 and decoding unit 34 are penetrated in Fourier conversion FFT unit 31, reflection fast.Antenna 40 is used for the OFDM code element of receiving data frames; FFT unit 31 is used for the OFDM code element is carried out quick Fourier conversion process, obtains the OFDM code element of frequency domain; Reflection is penetrated unit 32 and is used for extracting modulation symbol from the subcarrier of OFDM code element; Demodulation unit 33 is used for that modulation symbol is carried out rectification and handles data after obtaining encoding; Decoding unit 34 is used for the data after the demodulation are decoded, with restoring user data.
Consult shown in Figure 7ly, the main handling process that transmitting terminal sends data is as follows:
The data separation of the different user of at first coming the upper strata in step 700, base station is for being fit to the DRCH transmission and being fit to two kinds of LRCH transmission.
The algorithm of distinguishing is by dispatch layer decision (identical with existing mode, not in discussion scope of the present invention), and basic principle is that the higher user of the lower user of movement velocity, transmission rate is fit to the LRCH transmission; The user that movement velocity is high, transmission rate is lower and suitable DRCH transmission such as the user who has relatively high expectations in real time, public control signaling traffic.
Step 710, base station when the size of frame data quantity transmitted, are chosen suitable multiplexer mode according to DRCH and LRCH needs.
The logical data bag that step 720, communication system upper strata (as the MAC layer) are come, after being distinguished into DRCH type and LRCH type, do following processing:
If DRCH type, the average channel condition information (CQI) of the whole frequency band that feeds back according to whole transmitting terminal then, determine the suitable code modulation mode (MCS) of employing, and calculate the bit number that each DRCH can transmit, the i.e. size of DRCH physical package thus.DRCH logic bag,, be divided into several DRCH physical package according to the size of DRCH physical package.
If the LRCH type, then adopt dispatching algorithm this logical data bag is associated with LRCH (dispatching algorithm is identical with existing mode, not in discussion scope of the present invention).Basic principle is, according to the CQI of each subband, the LRCH of corresponding this subband distributed on this subband CQI user preferably.After the relevance of logical data bag and LRCH was determined, the CQI that can pass through the subband at LRCH place determined the code modulated mode of employing, can determine the bit number that each LRCH can transmit thus.According to this bit number the logical data bag is divided into LRCH physical data bag,
Step 730, carry out encoding process by 11 pairs of physical data bags of coding unit.
Data behind step 740,12 pairs of codings of modulating unit are modulated, and generate the modulation symbol bag.
Step 750, map unit 13 be the symbols of cutting apart in the good modulation symbol bag, on the subcarrier of related (mapping) a plurality of OFDM code elements in the present frame of each DRCH or LRCH correspondence.
Step 760, when all sons in the frame have carried all associated behind the corresponding data symbol, contrary discrete fast Fourier transform (IFFT) is done to the associated data on each OFDM code element in IFFT unit 14, obtains the OFDM code element of time domain.
Step 770, antenna 20 send a plurality of OFDM code elements in the frame continuously.
Consult shown in Figure 8ly, the main handling process that receiving terminal receives data is as follows:
If the user is the DRCH type, then according to the call number of DRCH, by obtaining corresponding modulation symbol on the subcarrier on each OFDM code element of the association of predefined this DRCH of system;
If the user is the LRCH type, then according to the call number of LRCH, by obtaining corresponding modulation symbol on the subcarrier on each OFDM code element of the association of predefined this LRCH of system.
Data after step 850,34 pairs of demodulation of the decoding unit restoring user data of decoding.
The data of the DRCH that obtains for decoding are formed this user's a physical data bag, with synthetic this user's of all physics data packet group of this frame of this user's correspondence logical data bag, send to the upper strata (as the MAC layer) of communication system.The data of this LRCH that obtains for decoding are formed this user's a physical data bag, with synthetic this user's of all physics data packet group of this user's correspondence logical data bag, send to the upper strata (as the MAC layer) of communication system.
Below further specify with an instantiation, this instantiation also is not used in qualification the present invention:
Provided pattern 1 and 2 two kinds of multiplexer modes of pattern respectively as Fig. 9 A, Fig. 9 B, its difference is the number of sub carrier wave difference that LRCH comprises.
Shown in Fig. 9 A, effective sub-carrier number of a certain communication system is 384.According to the frequency domain correlation of subcarrier, be divided into 12 subbands, each subband is formed (marked 3 subbands in front and last subband among Fig. 9 A, Fig. 9 B, mid portion omits and do not mark) by 32 continuous sub-carriers.
A data frame definition of this system is 7 OFDM code elements.According to aforesaid principle, in order to make LRCH is the sub-carrier number purpose multiple that DRCH comprises, and DRCH and minimum speed limit real time business are interrelated, getting the number of sub carrier wave that a DRCH comprises on each OFDM code element is 4, get number of sub carrier wave that LRCH comprises and be 4 multiple on each OFDM code element, as 16,24 etc.The number of sub carrier wave that the number of sub carrier wave that DRCH comprises comprises for each OFDM code element multiply by the number of the OFDM code element in each frame.Be 4 * 7=28 subcarrier in this example, the modulation system of establishing employing is 8PSK, and then DRCH bit number that can transmit is 84, and promptly a DRCH physical package size is 84.Be without loss of generality, if the minimum speed limit real time business of considering is speech business, then a voice packet is generally 80bit, add that redundancy check code is 84 bits, therefore voice packet can be placed on DRCH very easily and go up transmission, significantly reduce the complexity that dispatch layer is cut apart, and reduced the sub-carrier resources waste.
Because a DRCH is associated with 4 subcarriers on each OFDM code element.Principle according to the present invention is carried these 4 sons and is evenly distributed on the whole frequency band.Such as on first OFDM code element, with subcarrier from 0 to 383 number consecutively, then the subcarrier label that is associated of DRCH be 0,4 of 32 * 3+0=96,32 * 6+0=192,32 * 9+0=288 etc.For second OFDM code element, with respect to the subcarrier on first OFDM code element a side-play amount is arranged, this side-play amount determines that by frequency hop sequences frequency hop sequences can adopt RS sequence, Latin sequence etc.Such as, in this example, frequency hop sequences is 0,32+17=49,26,32 * 2+11=75,12,32 * 1+29=61,32 * 1+6=38 etc., be in first OFDM code element, the side-play amount of the 1st subcarrier in 4 subcarriers that are associated with DRCH1 is that 0, second side-play amount in the code element is 49, by that analogy (shown in the subcarrier of black slash part among the figure).
The number of the subcarrier that LRCH comprises is set according to system requirements.Such as, in the pattern shown in Fig. 9 A 1, the number of sub carrier wave that LRCH comprises gets 24 * 7,24 number of sub carrier wave that are associated for LRCH on each OFDM code element wherein, and 7 is the OFDM number of symbols in the frame.12 LRCH always have 12 subbands in the whole frequency band, to should be arranged.Therefore the neutralize summation of the subcarrier that these LRCH are associated of each OFDM code element is 24 * 12=288.Remaining number of sub carrier wave is 384-288=96.These 96 are associated with DRCH since each DRCH on an OFDM code element and 4 subcarriers be associated, therefore, always total 96/4=24 DRCH.These keep for the subcarrier of DRCH to be evenly distributed on the whole frequency domain, and in the pattern 1 as Fig. 9, per 3 subcarriers that 1 white is arranged are subcarriers of keeping for DRCH.That is to say that 4 subcarriers of the every biasing of DRCH1 must arrive a new DRCH.Can setover altogether 23 times.Remove in each subband outside the subcarrier that is associated with DRCH, remaining subcarrier and a LRCH are associated.Like this, the subcarrier on a plurality of OFDM code elements is associated with 24 DRCH and 12 LRCH respectively in frame.
In the pattern shown in Fig. 9 B 2, adopt similar method, subcarrier on a plurality of OFDM code elements in the frame is associated with 48 DRCH and 12 LRCH respectively, and the number of sub carrier wave of each DRCH association is 28, and the number of sub carrier wave of each LRCH association is 16 * 7=112.Because the assignment information of DRCH and LRCH is transmitted on common signal channel.Therefore, each terminal can be judged the multiplexer mode of employing according to the number of DRCH, and need not additionally increase signaling.In every kind of pattern, the sub-carrier number purpose integral multiple that number of sub carrier wave that LRCH comprises and DRCH comprise.Therefore,,, be easy to just to be divided into DRCH and transmit, perhaps be left to next frame and transmit if not enough in LRCH resource in frame if adopt the bag of LRCH transmission.And the relation of these integral multiples, make things convenient for the design of the logical data bag on upper strata, because in the current communication system, the logical data bag size of coming in the upper strata is fixing, if the big or small non-integral multiple relation of physical data bag, then the upper strata logical data bag of coming need could be fit to the size of physical data bag through complicated dividing, and is easy to generate remaining data.
The processing emission process of the logical data bag of coming in the upper strata as previously described.At first divide into and be fit to DRCH and suitable LRCH.Choosing suitable multiplexer mode and suitable MCS and LRCH or DRCH then is associated.Computed segmentation becomes the physical data bag.Obtain after the coded modulation on the subcarrier that modulation symbol is placed on each relevant OFDM code element of corresponding LRCH or DRCH successively.Each OFDM code element becomes time-domain signal through behind the IFFT, goes out by antenna transmission.
Receiving terminal is according to the time-domain signal that obtains, and FFT becomes the OFDM code element.Each portable terminal is according to the pattern information that obtains on the control channel and the LRCH or the DRCH index that are assigned with, the subcarrier of each the OFDM code element that is associated from this LRCH or DRCH takes out modulation symbol, pass through demodulation, decoding again, recover the physical data bag, be combined into the logical data bag, send to the upper strata.
In sum as can be known:
1, in pattern 1, the number of sub carrier wave in the frame of all DRCH associations is the interior sub-carrier number purpose 1/3 of a frame of all LRCH associations.And in the pattern 2, the number of sub carrier wave in the frame of all DRCH associations is that the interior number of sub carrier wave of a frame of all LRCH associations equates.Like this by selecting two kinds of patterns can coordinate the ratio of DRCH and LRCH data volume.
2, the number of sub carrier wave in the frame comprising of each DRCH is whole minute several times of sub-carrier number purpose that each LRCH comprises, greatly facilitate the definition of upper layer logic packet size like this, and the complexity when cutting apart the logical data bag when having reduced scheduling and being the physical data bag.
3, shown in Fig. 9 A, 9B, the subcarrier that DRCH is associated is evenly distributed in the whole temporal frequency face.Such uniformity has not only made things convenient for the design of frequency hopping pattern, and the user who helps DRCH transmission obtains the complete diversity on the whole temporal frequency domain.
4, the number of sub carrier wave that comprises of each DRCH is littler than the number of sub carrier wave that each LRCH comprises, and it is little to help being fit to packet like this, requires the cutting apart of logical data bag of the little business of time delay (as the VOIP business etc.).Because the CQI of each LRCH and each subband is associated, if with subband cut apart less, then sub band number is more, thereby needs the CQI number of feedback more, can increase the load of based on feedback link so greatly.So, adopt DRCH to come to be associated more real with the small data packets real time business.
5, DRCH frequency hopping on whole frequency, the good frequency hop sequences of application performance easily is such as RS sequence, Latin sequence etc.Different RS sequence or Latin sequence are adopted in different sub-districts, can obtain the average effect of fine presence of intercell interference, thereby improve the user's of cell edge frequency repeat utilization ratio.
6, less distribution control signaling is arranged: in existing punching technical scheme, DRCH user need know which part punched by LRCH user, and the more signaling of this informational needs is come informing user terminal.And in the present invention, has just decided in agreement the position of the part that has been accounted for by the user that disperses, and does not need the extra signaling to notify.
7, use simple mode to coordinate the ratio problems of the traffic carrying capacity that DRCH and LRCH be associated.In the prior art, the fixed ratio of the total number of sub-carriers that is associated of the total number of sub-carriers that is associated with all DRCH and all LRCH is 1: 1.And in practice, both ratio datas change often, and in most cases, the user of the unnecessary high-speed motion of user of low-speed motion.So be fixed as 1: 1st, improper.And in the present invention, can change both ratios by preference pattern, method is simple and practical, and does not need to increase any additional signaling.
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 (44)
1, a kind of OFDM physical channel resource allocation methods is characterized in that, comprises the steps:
Definition is formed discrete channel resource DRCH by the subcarrier that is dispersed in the fixed number on each orthogonal frequency division multiplex OFDM code element in a transmission frame, forms pooling of resources channel LRCH by all the other subcarriers in this transmission frame; And
The transmission means of transmitting users data adapting is associated with LRCH or DRCH with user data as required, and with data map on corresponding sub-carrier of OFDM code.
2, the method for claim 1 is characterized in that, forms a plurality of DRCH and a plurality of LRCH in a transmission frame, respectively by corresponding index sign.
3, the method for claim 1 is characterized in that, makes the number of sub carrier wave of forming DRCH on each OFDM code element identical and fixing.
4, method as claimed in claim 3 is characterized in that, the subcarrier spacing of forming DRCH on each OFDM code element is distributed on the whole frequency domain.
5, method as claimed in claim 4 is characterized in that, the subcarrier of forming DRCH on each OFDM code element is spacedly distributed on whole frequency domain.
6, method as claimed in claim 5 is characterized in that, in each subband that is made of a plurality of continuous subcarriers, the number of sub carrier wave that DRCH takies is identical.
7, as one of claim 1 to 6 described method, it is characterized in that, on different OFDM code elements, form the frequency generation saltus step of the subcarrier of DRCH.
8, method as claimed in claim 7 is characterized in that, the pattern of frequency hopping generates by frequency hop sequences.
9, method as claimed in claim 7 is characterized in that, different frequency hop sequences is chosen by the minimum principle of frequency collision in each sub-district.
10, method as claimed in claim 7 is characterized in that, the number of sub carrier wave that the number of sub carrier wave that LRCH comprises comprises more than or equal to DRCH, and be the sub-carrier number purpose integral multiple that DRCH comprises.
11, a kind of method that sends data is characterized in that, comprises the steps:
To need the transmitting users data to be associated with corresponding channel resource, this channel resource comprises by the subcarrier that is dispersed in the fixed number on each orthogonal frequency division multiplex OFDM code element in the transmission frame forms discrete channel resource DRCH, and forms pooling of resources channel LRCH by all the other subcarriers in this frame;
Data are carried out coded modulation generate modulation symbol, and be mapped on the corresponding sub-carrier of OFDM code;
Subcarrier is carried out contrary fast fourier transform handle and send the OFDM code element.
12, method as claimed in claim 11 is characterized in that, it is characterized in that, constitutes a plurality of DRCH and a plurality of LRCH in a transmission frame, and by corresponding index sign, this index information is notified receiving terminal by Common Control Channel respectively.
13, method as claimed in claim 12, it is characterized in that, when data are associated with channel resource, further according to DRCH and LRCH needs present frame data quantity transmitted size, select corresponding multiplexer mode, the number of sub carrier wave that each DRCH between wherein different multiplexer modes and LRCH comprise is that DRCH minimum in all multiplexer modes comprises sub-carrier number purpose integral multiple.
14, method as claimed in claim 11 is characterized in that, in the described transmission frame, the number of sub carrier wave of forming DRCH on each OFDM code element is identical and fixing.
15, method as claimed in claim 14 is characterized in that, the subcarrier spacing of forming DRCH on each OFDM code element is distributed on the whole frequency domain.
16, method as claimed in claim 15 is characterized in that, the subcarrier of forming DRCH on each OFDM code element is spacedly distributed on whole frequency domain.
17, method as claimed in claim 16 is characterized in that, in each subband that is made of a plurality of continuous subcarriers, the number of sub carrier wave that DRCH takies is identical.
18, as one of claim 11 to 17 described method, it is characterized in that, on different OFDM code elements, form the frequency generation saltus step of the subcarrier of DRCH.
19, method as claimed in claim 18 is characterized in that, the pattern of frequency hopping generates by frequency hop sequences.
20, method as claimed in claim 18 is characterized in that, different frequency hop sequences is chosen by the minimum principle of frequency collision in each sub-district.
21, method as claimed in claim 18 is characterized in that, the number of sub carrier wave that the number of sub carrier wave that LRCH comprises comprises more than or equal to DRCH, and be the sub-carrier number purpose integral multiple that DRCH comprises.
22, a kind of method that receives data is characterized in that, comprises the steps:
Receive the OFDM code element of a Frame, and the control information of obtaining channel resource from control channel, this channel resource comprises by the subcarrier that is dispersed in the fixed number on each orthogonal frequency division multiplex OFDM code element in the transmission frame forms discrete channel resource DRCH, and forms pooling of resources channel LRCH by all the other subcarriers in this frame;
Described OFDM sign indicating number is carried out fast fourier transform, recover the subcarrier on DRCH each OFDM code element related with LRCH;
Extract modulation symbol from subcarrier, and to modulating symbol demodulation and decoding to recover data.
23, method as claimed in claim 22 is characterized in that, in the described transmission frame, the number of sub carrier wave of forming DRCH on each OFDM code element is identical and fixing.
24, method as claimed in claim 23 is characterized in that, the subcarrier spacing of forming DRCH on each OFDM code element is distributed on the whole frequency domain.
25, method as claimed in claim 24 is characterized in that, the subcarrier of forming DRCH on each OFDM code element is spacedly distributed on whole frequency domain.
26, method as claimed in claim 25 is characterized in that, in each subband that is made of a plurality of continuous subcarriers, the number of sub carrier wave that DRCH takies is identical.
27, as one of claim 22 to 26 described method, it is characterized in that, on different OFDM code elements, form the frequency generation saltus step of the subcarrier of DRCH.
28, method as claimed in claim 27 is characterized in that, the pattern of frequency hopping generates by frequency hop sequences.
29, method as claimed in claim 27 is characterized in that, the number of sub carrier wave that the number of sub carrier wave that LRCH comprises comprises more than or equal to DRCH, and be the sub-carrier number purpose integral multiple that DRCH comprises.
30, a kind of emitter is characterized in that, comprising:
Be used for and need the transmitting users data to be associated with corresponding channel resource, this channel resource comprises by the subcarrier that is dispersed in the fixed number on each orthogonal frequency division multiplex OFDM code element in the transmission frame forms discrete channel resource DRCH, and the unit of being made of pooling of resources channel LRCH all the other subcarriers in this frame;
Data are carried out coded modulation generate modulation symbol, and be mapped to the unit on the corresponding sub-carrier of OFDM code;
Subcarrier is carried out the unit that the OFDM code element was handled and sent to contrary fast fourier transform.
31, emitter as claimed in claim 30 is characterized in that, also comprises:
Be used for selecting the unit of corresponding multiplexer mode according to DRCH and LRCH needs present frame data quantity transmitted size.
32, emitter as claimed in claim 30 is characterized in that, in the described transmission frame, the number of sub carrier wave of forming DRCH on each OFDM code element is identical and fixing.
33, emitter as claimed in claim 32 is characterized in that, the subcarrier spacing of forming DRCH on each OFDM code element is distributed on the whole frequency domain.
34, emitter as claimed in claim 33 is characterized in that, the subcarrier of forming DRCH on each OFDM code element is spacedly distributed on whole frequency domain.
35, emitter as claimed in claim 34 is characterized in that, in each subband that is made of a plurality of continuous subcarriers, the number of sub carrier wave that DRCH takies is identical.
36, as one of claim 30 to 35 described emitter, it is characterized in that, on different OFDM code elements, form the frequency generation saltus step of the subcarrier of DRCH.
37, emitter as claimed in claim 36 is characterized in that, the number of sub carrier wave that the number of sub carrier wave that LRCH comprises comprises more than or equal to DRCH, and be the sub-carrier number purpose integral multiple that DRCH comprises.
38, a kind of receiving system is characterized in that, comprising:
The OFDM code element that is used for receiving data frames, and the control information of obtaining channel resource from control channel, this channel resource comprises by the subcarrier that is dispersed in the fixed number on each orthogonal frequency division multiplex OFDM code element in the transmission frame forms discrete channel resource DRCH, and the unit of being made of pooling of resources channel LRCH all the other subcarriers in this frame;
Be used for described OFDM sign indicating number is carried out fast fourier transform, recover the unit of the subcarrier on DRCH each OFDM code element related with LRCH;
Be used for extracting modulation symbol from subcarrier, and to modulating symbol demodulation and decoding to recover the unit of data.
39, receiving system as claimed in claim 38 is characterized in that, in the described transmission frame, the number of sub carrier wave of forming DRCH on each OFDM code element is identical and fixing.
40, receiving system as claimed in claim 39 is characterized in that, the subcarrier spacing of forming DRCH on each OFDM code element is distributed on the whole frequency domain.
41, receiving system as claimed in claim 40 is characterized in that, the subcarrier of forming DRCH on each OFDM code element is spacedly distributed on whole frequency domain.
42, receiving system as claimed in claim 41 is characterized in that, in each subband that is made of a plurality of continuous subcarriers, the number of sub carrier wave that DRCH takies is identical.
43, as one of claim 38 to 42 described receiving system, it is characterized in that, on different OFDM code elements, form the frequency generation saltus step of the subcarrier of DRCH.
44, receiving system as claimed in claim 43, the number of sub carrier wave that the number of sub carrier wave that LRCH comprises comprises more than or equal to DRCH, and be the sub-carrier number purpose integral multiple that DRCH comprises.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010051704A1 (en) * | 2008-11-06 | 2010-05-14 | 中兴通讯股份有限公司 | Method for mapping resource cells |
| CN102111885A (en) * | 2009-12-23 | 2011-06-29 | 电信科学技术研究院 | Method and device for determining and adjusting encoded mode |
| CN102340476A (en) * | 2011-07-14 | 2012-02-01 | 哈尔滨工业大学 | OFDM (Orthogonal Frequency Division Multiplexing) communication system based on weighted score Fourier transform expansion |
| CN102752073A (en) * | 2011-04-21 | 2012-10-24 | 中兴通讯股份有限公司 | Data sending method and system |
| CN101399761B (en) * | 2007-09-27 | 2013-01-16 | 中兴通讯股份有限公司 | Method for mapping resource units onto resource blocks for long term evolution system |
| CN109039565A (en) * | 2012-03-16 | 2018-12-18 | 北京新岸线移动多媒体技术有限公司 | A kind of resource regulating method and device |
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| CN1297089C (en) * | 2003-03-14 | 2007-01-24 | 北京泰美世纪科技有限公司 | Continuous pilot frequency data transmission method based on OFDM frequency hop in broadcasting system |
| CN1567764B (en) * | 2003-06-23 | 2010-05-12 | 北京三星通信技术研究有限公司 | New sub-channel generating and allocating method of multi-user OFDMA system |
| KR100566274B1 (en) * | 2003-11-20 | 2006-03-30 | 삼성전자주식회사 | Apparatus and method for sub-carrier allocation in ofdm system |
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| CN101399761B (en) * | 2007-09-27 | 2013-01-16 | 中兴通讯股份有限公司 | Method for mapping resource units onto resource blocks for long term evolution system |
| WO2010051704A1 (en) * | 2008-11-06 | 2010-05-14 | 中兴通讯股份有限公司 | Method for mapping resource cells |
| US8711792B2 (en) | 2008-11-06 | 2014-04-29 | Zte Corporation | Method for mapping resource units |
| CN102111885A (en) * | 2009-12-23 | 2011-06-29 | 电信科学技术研究院 | Method and device for determining and adjusting encoded mode |
| CN102752073A (en) * | 2011-04-21 | 2012-10-24 | 中兴通讯股份有限公司 | Data sending method and system |
| WO2012142907A1 (en) * | 2011-04-21 | 2012-10-26 | 中兴通讯股份有限公司 | Data sending method and system |
| CN102752073B (en) * | 2011-04-21 | 2015-06-10 | 中兴通讯股份有限公司 | Data sending method and system |
| CN102340476A (en) * | 2011-07-14 | 2012-02-01 | 哈尔滨工业大学 | OFDM (Orthogonal Frequency Division Multiplexing) communication system based on weighted score Fourier transform expansion |
| CN109039565A (en) * | 2012-03-16 | 2018-12-18 | 北京新岸线移动多媒体技术有限公司 | A kind of resource regulating method and device |
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