CN101325739A - Method for transmitting upstream data and upstream control signaling - Google Patents
Method for transmitting upstream data and upstream control signaling Download PDFInfo
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- CN101325739A CN101325739A CNA2007101261649A CN200710126164A CN101325739A CN 101325739 A CN101325739 A CN 101325739A CN A2007101261649 A CNA2007101261649 A CN A2007101261649A CN 200710126164 A CN200710126164 A CN 200710126164A CN 101325739 A CN101325739 A CN 101325739A
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Abstract
The invention provides a device and method for transmitting forward data and forward control signal, comprising methods as follows: performing rate match to forward data; mapping forward data channel; mapping forward data channel when segmenting transmission block; distributing resources of forward control signal; configuring the forward sub-frame structure; and transmitting reference signal for channel measurement.
Description
Technical field
The present invention relates to wireless communication system, relate to a kind of transmit ascending data and uplink control signaling equipment and method in wireless communication system in particular.
Background technology
Now, 3GPP standardization body has set about beginning its existing system standard is carried out long-term evolution (LTE).In the middle of numerous physical layer transmission technology, be the focus of research based on the downlink transfer technology of OFDM (OFDM) with based on the uplink technology that single-carrier frequency division multiple access inserts (SCFDMA).Two kinds of hardwood structures are arranged: i.e. Class1 frame structure (Type1Frame Structure) and type 2 frame structures (Type 2Frame Structure) in LTE.Two kinds of duplex modes of FDD and TDD are arranged in the Class1 frame structure, and have only TDD duplex mode in type 2 frame structures.Be that example is described prior art and the problem in the current LTE system with LTE Class1 FDD system below, described problem is present in LTE type 2 systems equally.
According to the discussion result of current LTE, Fig. 1 is the downlink frame structure of LTE Class1 FDD, and radio frames (radio frame) time span (101-103) is 10ms; Each frame is divided into a plurality of time slots (slot) (104-107), and present hypothesis is that each radio frames comprises 20 time slots, and time slots length is 0.5ms; Each time slot comprises a plurality of OFDM symbols again.According to present hypothesis, the time span of effective OFDM symbol is about 66.7 μ s in the LTE system.The time span of the CP of OFDM symbol can have two kinds, be general CP (Normal CP, be also referred to as short CP) time span be approximately 4.69 μ s or 5.21 μ s, lengthening CP (Extended CP, be also referred to as long CP) time span be approximately 16.7 μ s, lengthening CP time slot is used for many Cell Broadcast CB/multicasts and the very large situation of radius of society, and general CP time slot (108) comprises 7 OFDM symbols, and lengthening CP time slot (109) comprises 6 OFDM symbols.According to present discussion result, continuous two time slots constitute subframes (subframe), and Transmission Time Interval (TTI) is 1ms, equal the time span of a subframe.
Fig. 2 is a LTE Class1 FDD system uplink frame structure, and with the downlink frame similar, the time span of its radio frames (201,202,203) is all 10ms mutually with WCDMA; Each frame is subdivided into a plurality of time slots (204-207), and present hypothesis is that each radio frames comprises 20 time slots, and time slots length is 0.5ms; Each time slot comprises a plurality of SCFDMA symbols again.Consistent with the downlink frame structure, the CP of SCFDMA symbol has two kinds of length, promptly general CP and lengthening CP, and general CP time slot comprises 7 SCFDMA symbols, and lengthening CP time slot comprises 6 SCFDMA symbols.According to present discussion result, continuous two time slots constitute subframes (subframe), and Transmission Time Interval (TTI) is 1ms, equal the time span of a subframe.
Fig. 3 is the signal processing of SCFDMA, transmitting terminal obtains its modulation symbol that need send (301) through certain processing, transform to frequency domain through DFT module (301), be mapped to the sub-carrier positions of system assignment then through subcarrier mapping block (303), next return time domain through IFFT module (304) conversion, then add CP (305), carry out follow-up operation then.Attention is in order to distinguish with the DFT operation of IFFT operation (304) and execution when receiving, and the DFT operation of module (301) is called the Pre-DFT operation.
According to the discussion result of in the LTE system upstream control signaling being transmitted, when not having transmitting uplink data, ascending control information (CQI, ACK/NACK etc.) transmits in the frequency band of reserving; When having transmitting uplink data, ascending control information transmits in the uplink data channels that distributes.At this moment, upstream data and upstream control signaling are imported the Pre-DFT module in multiplexing back, and carry out follow-up SCFDMA operation.
According to the discussion result in the LTE system, when the bit number of transmission block is worth N greater than certain
MaxThe time, need carry out segmentation (segmentation) to transmission block, thereby respectively each segmentation be encoded.In LTE, N
MaxEqual 6144, the mode of coding adopts the Turbo coding.According to the discussion result in the LTE system, rate-matched is based on the speed matching method (CBRM) of cyclic buffer (Circular Buffer).As Fig. 4 is the transmit operation schematic diagram of CBRM.At first, transmission block or its segmentation obtain system bits S, check digit P1 and check digit P2 after the Tubo encoder encodes; Then, respectively system bits S, check digit P1 and check digit P2 are carried out sub-block interleaving; Next, the check digit P1 after interweaving and interweave after check digit P2 according to p
1p
2p
1p
2... pattern be staggered, and the back of adding the system bits S after interweaving to constitutes cyclic buffer; Like this, the method for the bit stream of transmission each time of obtaining is that certain position from this cyclic buffer begins to read continuously N bit, and the N here is subject to the number of resources of physical data channel.
According to the discussion of current LTE, when multiplexing upstream data and upstream control signaling, the strategy of two kinds of rate-matched can be arranged.The strategy of one leg speed rate coupling is meant considers the uplink control signaling influence when upstream data is carried out rate-matched, its output bit number is by the data decision of the uplink data channels resource that is actually used in upstream data.The operation of the strategy of two leg speed rates coupling is formed by two ones, and the first step is not consider the uplink control signaling influence, and only the resource sum according to uplink data channels carries out rate-matched to upstream data; Second step was to consider the uplink control signaling influence, and the bit after the first step coupling is punched obtains bit in the uplink data channels transmitted over resources that is actually used in upstream data.The bit number of the method output of these two kinds of rate-matched equates, but the bit of concrete output generally is different.
In the discussion of current LTE, the uplink reference signals structure of Class1 frame structure as shown in Figure 5.Example one is the uplink reference signals structure of general CP subframe, and each time slot comprises 7 SCFDMA symbols, is designated as symbol # 0～symbol # 6, then is positioned at the middle SCFDMA symbol (being symbol #3) of time slot and is used for transmitting uplink reference signal.Example two is uplink reference signals structures of lengthening CP subframe, and each time slot comprises 6 SCFDMA symbols, is designated as symbol # 0～symbol # 5, and then the symbol # 2 of first time slot and second time slot symbol # 3 are used for transmitting uplink reference signal.In above-mentioned uplink reference signals structure, when subscriber equipment sent signal simultaneously on a plurality of antennas, the reference signal of a plurality of antennas adopted mode the transmitting as on the symbol of reference signal at each time slot of CDM.
Summary of the invention
The purpose of this invention is to provide transmit ascending data and uplink control signaling equipment and method in wireless communication system.
According to an aspect of of the present present invention, a kind of upstream data is carried out the method for rate-matched, comprise the steps:
A) subscriber equipment is encoded to upstream data;
B) subscriber equipment carries out rate-matched according to the sum of removing the remaining RE of RE that type # 1 control signaling takies in the uplink data channels to upstream data, obtains bit stream R1;
C) number of the RE that takies according to type # 2 control signaling of subscriber equipment is punched to bit stream R1.
According to another aspect of the present invention, a kind of method of mapping uplink data channel comprises the steps:
A) subscriber equipment is encoded to upstream data;
B) subscriber equipment carries out rate-matched to the bit after encoding, and remembers that the set of the bit that need destroy when transport-type # 2 upstream control signaling is B
C, the set of other bits is B
D
C) with whether to send upstream control signaling irrelevant, subscriber equipment is fixing set B
DBit be mapped to set A
DOn the interior RE, here, the set that note may be used for the RE of control channel is A
C, the set that note is fixed for the RE of transfer of data is A
D
According to an aspect of of the present present invention, a kind of method of mapping uplink data channel during to the transmission block segmentation comprises the steps:
A) subscriber equipment is to the transmission block segmentation, and encodes respectively;
B) when needs send upstream control signaling, the RE number minimizing N that segmentation takies
CIndividual, N here
CIt is the number of the RE that takies of upstream control signaling;
C) bit of subscriber equipment after to the coding of each segmentation carries out rate-matched.
D) subscriber equipment carries out the physical resource mapping to each segmentation.
According to an aspect of of the present present invention, a kind of method of distributing the uplink control signaling resource comprises the steps:
A) subscriber equipment is encoded to upstream control signaling;
B) subscriber equipment is mapped to upstream control signaling on the SCFDMA symbol between the symbol of two transmission of reference signals of a TTI and transmits.
According to an aspect of of the present present invention, a kind of method of collocating uplink subframe structure comprises the steps:
A) the long slightly CP of first SCFDMA symbol configuration of sub-frame of uplink;
B) CP that configuration is lacked slightly from second SCFDMA symbol to penult SCFDMA symbol in the sub-frame of uplink;
C) the long slightly CP of last SCFDMA symbol configuration of sub-frame of uplink.
According to an aspect of of the present present invention, a kind of method of collocating uplink subframe structure comprises the steps:
A) first SCFDMA symbol of last SCFDMA symbol of n subframe of base station configuration and n+1 subframe is used to transmit CS-RS;
B) the SCFDMA symbol that is used for CS-RS carries out duplicate allocation every the individual subframe of k (k is more than or equal to 0).
Description of drawings
Fig. 1 is the downlink frame structure of LTE Class1;
Fig. 2 is the uplink frame structure of LTE Class1;
Fig. 3 is a SCFDMA Signal Processing process;
Fig. 4 is based on the speed matching method of cyclic buffer;
Uplink reference signals structure when Fig. 5 is general CP;
Fig. 6 is the method for upstream data being carried out rate-matched;
Fig. 7 is the method for mapping uplink data and ACK/NACK;
Fig. 8 is the method for mapping uplink data, CQI and ACK/NACK;
Fig. 9 is the transfer approach of mapping uplink data channel during to the transmission block segmentation;
Figure 10 is the method for distributing the uplink control signaling resource;
Figure 11 is the sub-frame of uplink structure;
Figure 12 is the method that transmission is used for the reference signal of channel measurement.
Embodiment
Upstream control signaling can be divided into two types, first type (type #1) is that base station and subscriber equipment both sides be sure of the upstream control signaling whether it transmits, for example periodic channel quality indication (CQI), periodic CQI signaling disposes by high-level signaling, its reliability is very high, so base station and subscriber equipment are all known the timing of CQI transmission and the resource that takies.Might there be probabilistic control signaling in second type (type #2) between base station and the subscriber equipment, for example respond the ACK/NACK of descending HARQ transfer of data, because subscriber equipment might error detection carries out the downlink physical control channel (PDCCH) of descending scheduling, this comprises: the base station has sent carries out the PDCCH of descending scheduling and subscriber equipment does not detect to subscriber equipment, perhaps the base station do not send the PDCCH that carries out descending scheduling of subscriber equipment and the subscriber equipment error detection to the PDCCH that carries out descending scheduling; Like this, subscriber equipment can not be sure of fully whether it needs to send ACK/NACK control signaling.
The present invention describes below multiple when having transmitting uplink data, the method that upstream control signaling is transmitted in uplink data channels.
Upstream data is carried out the method for rate-matched:
When needs on uplink data channels simultaneously when transmit ascending data and upstream control signaling, a part of resource before the Pre-DFT module is used for upstream control signaling, can be used for a resource shrinkage of transmit ascending data, so upstream data is being encoded and during rate-matched, the influence of the resource that needs to consider that these upstream control signalings take.According to top to uplink control signaling classification, when the present invention correspondingly proposes transmit ascending data and upstream control signaling simultaneously to the speed matching method of upstream data.
The sum of the Resource Unit (RE) of physical resource is N in the note uplink data channels
S, modulation symbol of each RE transmission, the physical number of bits of modulation symbol is k, and k is by the modulation system that the is adopted decision of transmitting uplink data here, and for example to QPSK, k equals 2; To 16QAM, k equals 4; To 64QAM, k equals 6.Below the uplink control signaling type that sends is as required introduced processing method of the present invention respectively.
When not needing to transmit upstream control signaling, only the RE sum according to uplink data channels carries out rate-matched to upstream data, and then rate-matched output bit number is kN
S
When only needing transmit ascending data and type # 1 control signaling, the sum of the RE that the RE that takies according to removal type # 1 control signaling in the uplink data channels is left carries out rate-matched to upstream data.The number of the RE that note type # 1 control signaling takies is N
C1, then rate-matched output bit number is k (N
S-N
C1).
When only needing transmit ascending data and type # 2 control during signaling, at first upstream data is carried out rate-matched and obtain bit stream R according to the RE sum of uplink data channels, its bit number is kN
SFurther bit stream R is punched then, the number of the RE that note type # 2 control signaling takies is N
C2, the number of bits of then destroying is N
C=kN
C2, final rate-matched output bit number is k (N
S-N
C2).
When needs transmit ascending data, type # 1 control signaling and type # 2 control signaling, at first upstream data is carried out rate-matched according to the sum of removing the remaining RE of RE that type # 1 control signaling takies in the uplink data channels, obtain k (N
S-N
C1) the bit stream R1 of individual bit, remember that here the number of the RE that type # 1 control signaling takies is N
C1Further bit stream R1 is punched then, the number of the RE that note type # 2 control signaling takies is N
C2, the bit number of then destroying is N
C=kN
C2, final rate-matched output bit number is k (N
S-N
C1-N
C2).
The method of mapping uplink data channel:
According to subscriber equipment needs transmission types # 1 upstream control signaling whether, the method for mapping uplink data channel of the present invention is described respectively.The sum of the Resource Unit (RE) of physical resource is N in the note uplink data channels
S, modulation symbol of each RE transmission, the physical number of bits of modulation symbol is k, and k is by the modulation system that the is adopted decision of transmitting uplink data here, and for example to QPSK, k equals 2; To 16QAM, k equals 4; To 64QAM, k equals 6.
When subscriber equipment does not need transmission types # 1 upstream control signaling, transmit ascending data and type # 2 uplink control signaling method are described below.Total number of bits when note does not send upstream control signaling after the rate-matched is R, and it equals physics total number of bits, i.e. R=kN
SWhen needs transmission types # 2 upstream control signaling, supposing has N
CIndividual RE is used for control channel, and correspondingly, the physical number of bits that upstream data takies reduces R
C=kN
CNote may be used for the N of control channel
CThe set of individual RE is A
C, note is fixed for the N of transfer of data
S-N
CThe set of individual RE is A
D
Subscriber equipment is encoded and rate-matched to upstream data, for example can adopt the speed matching method (CBRM) based on cyclic buffer.Note when not sending upstream control signaling the bit stream after the rate-matched be not B, then when the transmission upstream control signaling, the R among the bit stream B
CIndividual bit need be struck off.This R
CThe individual bit of destroying can be the back R of bit stream
CIndividual bit, preceding R
CThe R of individual bit or other position
CIndividual bit, the present invention does not limit the R that destroys
CThe position of individual bit.Here, the R that need destroy
CIndividual bit can be the check digit of encoder (for example Turbo encoder) output and do not comprise system bits.The R that note need be destroyed when the transmission upstream control signaling
CThe set of individual bit is B
C, other R-R
CThe set of individual bit is B
DBecause type # 2 upstream control signaling has uncertainty, be that subscriber equipment may be not send or transmission types # 2 control signaling not according to the dispatch command of base station, in order to guarantee that as much as possible transmitting uplink data is not subjected to the influence of type # 2 control signaling, system adopts special physical resource mapping method to handle set B
CAnd set B
DBit.
When subscriber equipment thought that needs send upstream data and type # 2 upstream control signaling, to upstream data, subscriber equipment was set B
DBit be mapped to set A
DInterior N
S-N
COn the individual RE; To type # 2 upstream control signaling, subscriber equipment is mapped to set A after it is encoded
CInterior N
COn the individual RE.Only thinking when subscriber equipment needs to send upstream data and when not needing transmission types # 2 upstream control signaling all N
SIndividual RE is used for transmit ascending data, and subscriber equipment is set B
DBit be mapped to set A
DInterior N
S-N
COn the individual RE, and set B
CBit be mapped to set A
CInterior N
COn the individual RE.Under superincumbent two kinds of situations, no matter whether transmission types # 2 controls signaling, subscriber equipment pair set B to subscriber equipment
DBit processing and toward set A
DInterior N
S-N
CMapping method on the individual RE is identical.
When subscriber equipment needs transmission types # 1 upstream control signaling, transmit ascending data, type # 1 upstream control signaling and type # 2 uplink control signaling method are described below.When needs transmission types # 1 and type # 2 upstream control signaling, supposing has N
CIndividual RE is used for control channel, is designated as set A
C, N wherein
C1Individual RE is used for type # 1 control signaling, is designated as set A
C1N
C2Individual RE is used for type # 2 control signaling, is designated as set A
C2, N here
C1+ N
C2=N
CNote is fixed for the N of transfer of data
S-N
CThe set of individual RE is A
D
Subscriber equipment is encoded and rate-matched to upstream data, for example can adopt the speed matching method (CBRM) based on cyclic buffer, and the bit stream when note does not send upstream control signaling after the rate-matched is B.Because type #1 control signaling is determined and will be transmitted, so the R among the bit stream B
C1=kN
C1Individual bit is determined and will be destroyed.This R
C1The individual bit of destroying can be the back R of bit stream
C1Individual bit, preceding R
C1The R of individual bit or other position
C1Individual bit, the present invention does not limit the R that destroys
C1The position of individual bit.Note is destroyed R
C1Upstream data bit stream behind the individual bit is B
1When needs transmission types #2 upstream control signaling, bit stream B
1In R
C2=kN
C2Individual bit further is struck off.This R
C2The individual bit of destroying can be the back R of bit stream
C2Individual bit, preceding R
C2The R of individual bit or other position
C2Individual bit, the present invention does not limit the R that destroys
C2The position of individual bit.Note is further destroyed R
C2Upstream data bit stream behind the individual bit is B
2Here, the R that need destroy
CIndividual bit can be the check digit of encoder (for example Turbo encoder) output and do not comprise system bits.Note is bit stream B when transport-type #2 upstream control signaling
1The R that need destroy
C2The set of individual bit is B
C2, other R-R
CThe set of individual bit is B
DBecause type #2 upstream control signaling has uncertainty, be that subscriber equipment may be not send or transmission types #2 control signaling not according to the dispatch command of base station, in order to guarantee that as much as possible transmitting uplink data is not subjected to the influence of type #2 control signaling, system adopts special physical resource mapping method to handle set B
C2And set B
DBit.
When subscriber equipment thought that needs send upstream data, type # 1 upstream control signaling and type # 2 upstream control signaling, to upstream data, subscriber equipment was set B
DBit be mapped to set A
DInterior N
S-N
COn the individual RE; To type # 1 upstream control signaling, subscriber equipment is mapped to set A after it is modulated
C1Interior N
C1On the individual RE; To type # 2 upstream control signaling, subscriber equipment is mapped to set A after it is modulated
C2Interior N
C2On the individual RE.Only thinking when subscriber equipment needs to send upstream data and type # 1 control signaling and when not needing transmission types # 2 upstream control signaling, to upstream data, subscriber equipment is set B
DBit be mapped to set A
DInterior N
S-N
COn the individual RE, and set B
C2Bit be mapped to set A
C2Interior N
C2On the individual RE; To type # 1 upstream control signaling, subscriber equipment is mapped to set A after it is modulated
C1Interior N
C1On the individual RE.Under superincumbent two kinds of situations, no matter whether transmission types # 2 controls signaling, subscriber equipment pair set B to subscriber equipment
DBit processing and toward set A
DInterior N
S-N
CMapping method on the individual RE is identical.
The transfer approach of mapping uplink data channel during to the transmission block segmentation:
When the bit number of transmission block is worth N greater than certain
MaxThe time, need carry out segmentation (segmentation) to transmission block, thereby respectively the Turbo coding be carried out in each segmentation.In LTE, N
MaxEqual 6144, the mode of coding adopts the Turbo coding.Here k=1,2 .., N.The sum of the Resource Unit (RE) of physical resource is N in the note uplink data channels
S, the number of the RE that upstream control signaling takies is N
C
The number of the segmentation of note transmission block is N, and the RE number that each segmentation took when note did not send upstream control signaling is respectively N
k SegWhen needs sent upstream control signaling, first method was that the RE number that each segmentation of transmission block takies reduces uniformly.When needs sent upstream control signaling, second method was that the RE number of having only a segmentation to take reduces N
CIndividual.The present invention does not limit the RE that segmentation in N the segmentation of transmission block takies and reduces.
According in the present LTE system to the discussion of coding, in the LTE system predefine size of some Turbo interleavers, this has correspondingly determined the size of the encoding block that each is possible.When the size of transmission block is not predefined certain numerical value, need add filling bit to it; Similarly,, need carry out segmentation in LTE, at this moment have in the segmentation to comprise filling bit transmission block when the size of transmission block during greater than certain numerical value (being 6144).According to the discussion result among the LTE, after to transmission block or its segment encoding, the system bits of filling bit correspondence and check digit P1 will be removed, and the processing method of check digit P2 is also uncertain, and each bit that a kind of possible mode is check digit P2 all is retained.The top RE number that a segmentation is taken is reduced N
CTransmit the uplink control signaling method, the segmentation that the RE number reduces can be the segmentation of having added filling bit, and when the bit behind the coding of this segmentation is carried out rate-matched, preferentially destroys the bit of unnecessary check digit P2.
Suppose that when transmission block is divided into a plurality of segmentation rate-matched is that each segmentation is carried out respectively, and when physical resource shone upon, a segmentation only was mapped on a part of symbol of TTI inside.At receiving terminal, in order to carry out decoding processing to segmentation as soon as possible, to the segmentation of transmitting on the symbol of TTI front portion, the reference signal at TTI rear portion can not be used for channel estimating, and channel estimated accuracy is relatively low; And the segmentation on the symbol at TTI rear portion, transmitting, all reference signals in the TTI may be used to channel estimating, and channel estimated accuracy is higher relatively.So the decoding performance that is positioned at the segmentation on the anterior symbol of TTI is relatively poor, and it is better to be positioned at the decoding performance of the segmentation on the symbol of TTI rear portion.The top RE number that a segmentation is taken is reduced N
CTransmit the uplink control signaling method, the segmentation that the RE number reduces can be the segmentation in the transmission of TTI rear portion, for example among the TTI according to last segmentation of transmitting time order.Like this, though when sending upstream control signaling, the RE number of this segmentation reduces, the decoding performance that is unfavorable for this segmentation, but the channel estimated accuracy of this segmentation is than higher, thereby takes all factors into consideration each factor, and the decoding performance of this segmentation is guaranteed.
Two processing modes above comprehensive reduce N to the top RE number that a segmentation is taken
CTransmit the uplink control signaling method, the segmentation that the RE number reduces can be the segmentation of having added filling bit, and is mapped to the transmission of TTI rear portion.
The method of distributing the uplink control signaling resource:
According to the discussion result of current LTE, when needs while transmit ascending data and upstream control signaling, upstream control signaling transmits in uplink data channels.To each SCFDMA symbol, input Pre-DFT module behind control signaling and the data multiplex, thus guaranteed single-carrier nature.The control signaling can be transmitted on a plurality of SCFDMA symbols in TTI.
Transmit upstream control signaling on the SCFDMA symbol between the symbol that first kind of method of allocating resources is two transmission of reference signals in up TTI.Adopt this method, the recipient does channel estimating according to the symbol of two transmission of reference signals to the SCFDMA symbol between them, and channel estimated accuracy is higher, helps improving the uplink control signaling reliability.
Second kind of method of allocating resources is measuring on other SCFDMA symbols the SCFDMA symbol of reference signal (DM-RS) of the reference signal (CS-RS) of (Channel Sounding) and data demodulates and transmit upstream control signaling except being used for transmission channel in up TTI.Here, the SCFDMA symbol that may be used to transmit CS-RS can be first symbol of TTI, can be last symbol of TTI, also can be other locational symbols.Adopt this method, when needs sent CS-RS, this SCFDMA symbol sent CS-RS; When not needing to send CS-RS, this SCFDMA symbol is used to send upstream data, sends control signaling and be not used in.
The third method of allocating resources is to transmit upstream control signaling on other SCFDMA symbols except the SCFDMA symbol of two the SCFDMA symbols of head and the tail of TTI and the reference signal (DM-RS) that is used for data demodulates.
The method of collocating uplink subframe structure:
According among the current LTE to the discussion result of CP length, comprise 7 SCFDMA symbols in the time slot of the general CP of LTE Class1, one of them symbol has long CP, approximately be 5.21 μ s, and the CP length of other six symbols is short slightly, approximately is 4.69 μ s.This long slightly CP mainly is rising and the fall time (ramp up/ramp down) that is used for compensating signal.According to the discussion result among the LTE, sub-frame of uplink is made up of two continuous time slots, and the length of TTI is a subframe.According in the present LTE system to the discussion result of CS-RS, CS-RS sends on the SCFDMA symbol that is different from the reference signal (DM-RS) that is used for data demodulates; The SCFDMA symbol that is used for transmitting CS-RS can distribute in each subframe, also can be every the individual sub-frame allocation of k (k is greater than 1) once.
In each sub-frame of uplink inside, there are some subscriber equipmenies sending upstream data, there are some subscriber equipmenies sending upstream control signaling, also have some subscriber equipmenies to be used for the reference signal (CS-RS) that transmission channel is measured (Channel Sounding) in transmission.These information all need to consider to rise and the influence of fall time when sending.That is, first SCFDMA symbol of uplink data channels need dispose long slightly CP; First SCFDMA symbol of ascending control channel need dispose long slightly CP; The SCFDMA symbol that sends CS-RS need dispose long slightly CP.
According to the demand, the present invention proposes a kind of method that disposes subframe structure: the long slightly CP of first SCFDMA symbol configuration of first time slot of a subframe; The CP that last SCFDMA symbol configuration of second time slot of this subframe is simultaneously grown slightly; The short slightly CP of other SCFDMA symbol configurations of two time slots in the subframe.When needs sent CS-RS, last SCFDMA symbol of subframe was used to send CS-RS, and whether first SCFDMA symbol that attention the present invention does not limit subframe is used to send CS-RS.Upstream data. signals sends from first SCFDMA sign-on in the subframe.Uplink control signal sends from first SCFDMA sign-on in the subframe.
Notice the present invention does not limit upstream control signaling whether can transmit with CS-RS in identical SCFDMA symbol, i.e. transmission in last SCFDMA symbol of subframe.When needs when a subframe sends upstream control signaling and CS-RS simultaneously, a kind of method is that upstream control signaling only sends in other symbols except that last SCFDMA symbol in subframe, CS-RS sends on last SCFDMA symbol of subframe simultaneously, and promptly upstream control signaling and CS-RS are that TDM is multiplexing.Another kind method is to send in upstream control signaling all SCFDMA symbols in subframe, and CS-RS sends on last SCFDMA symbol of subframe simultaneously, and promptly upstream control signaling and CS-RS are that FDM is multiplexing.
Transmission is used for the method for the reference signal (CS-RS) of channel measurement:
In wireless communication system, for support receiving diversity, subscriber equipment generally has two reception antennas, promptly subscriber equipment can receive simultaneously on two antennas from signal of base station and merge reception.But for cost and the complexity that reduces subscriber equipment, subscriber equipment generally has only a power amplifier, that is to say, subscriber equipment once can only send signal on an antenna.In order to support the frequency scheduling to uplink, the base station need obtain the channel status on two transmit antennas of subscriber equipment, and promptly subscriber equipment need be respectively two antenna transmission CS-RS.Especially, to the TDD system, the CS-RS that subscriber equipment sends can be used to estimate the state of uplink and downlink channel simultaneously.According in the present LTE system to the discussion result of CS-RS, CS-RS sends on the SCFDMA symbol that is different from the reference signal (DM-RS) that is used for data demodulates; The SCFDMA symbol that is used for transmitting CS-RS can distribute in each subframe, also can be every the individual sub-frame allocation of k (k is greater than 1) once.
To having only the subscriber equipment of a power amplifier, it can only send the CS-RS of an antenna at each SCFDMA symbol, in order to realize channel measurement to two transmitting antennas, subscriber equipment need take two SCFDMA symbols, thereby sends the CS-RS of two antennas on the different time respectively.Kwh loss when sending CS-RS in order to reduce the subscriber equipment that has only a power amplifier as far as possible, requiring these two the SCFDMA symbols as CS-RS is continuous in time; In order to reduce the influence to general transmitting uplink data, the continuous SCFDMA symbol as CS-RS should belong to different subframes.Like this, the present invention proposes, and at two SCFDMA symbols of the intersection of two subframes, promptly first SCFDMA symbol of last SCFDMA symbol of n subframe and n+1 subframe is used to transmit CS-RS; Simultaneously, the SCFDMA symbol that is used for CS-RS that distributes by this method carries out duplicate allocation every the individual subframe of k (k is greater than 0).According to the method, to having only the subscriber equipment of a power amplifier, the base station can dispose it and be respectively different antenna transmission CS-RS on two continuous SCFDMA symbols.
Each the SCFDMA symbol that guarantees to be used for CS-RS if desired has that thereby long slightly CP compensation is risen and during the influencing of fall time, the method for above-described collocating uplink subframe structure of the present invention can be used to guarantee this demand.According to the method for this collocating uplink subframe structure, two SCFDMA symbols of the head and the tail of subframe have long slightly CP, can be used to transmit CS-RS.If further need to guarantee that the SCFDMA symbol of uplink data channels has also that thereby long slightly CP compensation is risen and during the influencing of fall time, first SCFDMA symbol that can limit subframe adopts the method for frequency division multiplexing to transmit CS-RS and upstream data.For example, when needs send CS-RS, have a subcarrier to be used to transmit CS-RS every 2 subcarriers in first SCFDMA symbol of subframe, other subcarriers are used for transmit ascending data simultaneously.The present invention does not limit the uplink control signaling processing method.
Embodiment
This part has provided seven embodiment of this invention, and is too tediously long for fear of the description that makes this patent, in the following description, omitted the detailed description of function that the public is known or device etc.
First embodiment
When describing the present invention's while transmit ascending data, CQI and ACK/NACK in the present embodiment upstream data is carried out the method for rate-matched.The sum of the Resource Unit (RE) of physical resource is N in the note uplink data channels
S, modulation symbol of each RE transmission, the physical number of bits of modulation symbol is k.The number of the RE that note CQI takies is N
C1, the number of the RE that note ACK/NACK takies is N
C2
As shown in Figure 6, at first upstream data is carried out Turbo coding (801), the bit number behind the note coding is N
eThen, according to the total N of the RE of uplink data channels
SThe RE number N that takies in physical layer with CQI
C1, to the N behind the coding
eIndividual bit carries out first step rate-matched, and the bit number of its output is N
RM1=k (N
S-N
C1) (802); Next, the RE number N that takies in physical layer according to ACK/NACK
C2, at the N of first step rate-matched output
RM1Punch on the basis of individual bit, obtain the N of upstream data in the physical layer actual transmissions
RM2=k (N
S-N
C1-N
C2) individual bit; At last, upstream data, CQI and ACK/NACK are multiplexed on the uplink data channels.
Second embodiment
Transmit ascending data of the present invention and ACK/NACK uplink control signaling method are described in the present embodiment.The sum of the Resource Unit (RE) of physical resource is N in the note uplink data channels
S, modulation symbol of each RE transmission, the physical number of bits of modulation symbol is k, then the physics total number of bits of uplink data channels is R=kN
SWhen needs sent ACK/NACK, supposing had N
CIndividual RE is used for control channel, and correspondingly, the physical number of bits that upstream data takies reduces R
C=kN
CTo uplink data channels, note may be used for the N of control channel
CThe set of individual RE is A
C, note is fixed for the N of transfer of data
S-N
CThe set of individual RE is A
DBit stream when note does not send upstream control signaling after the rate-matched is b
1, b
2..., b
R, suppose when sending upstream control signaling back R
CIndividual bit
Need be struck off, here back R
CIndividual bit
It is a part of check digit of Turbo encoder output and do not comprise system bits.
As shown in Figure 7, based on the speed matching method (CBRM) of cyclic buffer, the front portion of cyclic buffer is a system bits, and the rear portion is a check digit, R the bit of reading from cyclic buffer also be system bits preceding, check digit after.Shown in example one, when subscriber equipment thought that needs send upstream data and ACK/NACK, to upstream data, subscriber equipment was exported R-R to CBRM
CBit
Be mapped to set A
DInterior N
S-N
COn the individual RE; To ACK/NACK, subscriber equipment is mapped to set A after it is encoded
CInterior N
COn the individual RE.Shown in example two, only thinking when subscriber equipment needs to send upstream data and when not needing to send ACK/NACK all N
SIndividual RE is used for transmit ascending data, and subscriber equipment is exported R-R to CBRM
CBit
Be mapped to set A
DInterior N
S-N
COn the individual RE, and back R
CIndividual bit
Be mapped to set A
CInterior N
COn the individual RE.In example one and example two, subscriber equipment is to bit
Processing and toward set A
DInterior N
S-N
CMapping method on the individual RE is identical.
The 3rd embodiment
Transmit ascending data of the present invention, CQI and ACK/NACK uplink control signaling method are described in the present embodiment.Identical with embodiment two, the sum of the Resource Unit (RE) of physical resource is N in the note uplink data channels
S, the physical number of bits of modulation symbol is k, then the physics total number of bits of uplink data channels is R=kN
SWhen needs sent CQI and ACK/NACK, supposing had N
CIndividual RE is used for control channel, is designated as set A
C, N wherein
C1Individual RE is used for CQI, is designated as set A
C1N
C2Individual RE is used for ACK/NACK, is designated as set A
C2, N here
C1+ N
C2=N
CNote is fixed for the N of transfer of data
S-N
CThe set of individual RE is A
DBit stream when note does not send upstream control signaling after the rate-matched is b
1, b
2..., b
RBecause CQI determines and will transmit, so bit stream b
1, b
2..., b
RBack R
C1=kN
C1Individual bit
Determine and to destroy that the bit stream of upstream data becomes like this
When needs send ACK/NACK, bit stream
Back R
C2Individual bit
Further be struck off.Here R after
CIndividual bit
It is a part of check digit of Turbo encoder output and do not comprise system bits.
As shown in Figure 8, based on the speed matching method (CBRM) of cyclic buffer, the front portion of cyclic buffer is a system bits, and the rear portion is a check digit, R the bit of reading from cyclic buffer also be system bits preceding, check digit after.Shown in example one, when subscriber equipment thought that needs send upstream data, CQI and ACK/NACK, to upstream data, subscriber equipment was bit
Be mapped to set A
DInterior N
S-N
COn the individual RE; To CQI, subscriber equipment is mapped to set A after it is modulated
C1Interior N
C1On the individual RE; To ACK/NACK, subscriber equipment is mapped to set A after it is modulated
C2Interior N
C2On the individual RE.Shown in example two, only thinking when subscriber equipment needs to send upstream data and CQI and when not needing to send ACK/NACK, to upstream data, subscriber equipment is bit
Be mapped to set A
DInterior N
S-N
COn the individual RE, and bit
Be mapped to set A
C2Interior N
C2On the individual RE; To CQI, subscriber equipment is mapped to set A after it is modulated
C1Interior N
C1On the individual RE.Under superincumbent two kinds of situations, no matter whether subscriber equipment sends AKC/NACK, subscriber equipment is to bit
Processing and toward set A
DInterior N
S-N
CMapping method on the individual RE is identical.
The 4th embodiment
The method of the mapping uplink data channel of the present invention when transmission block has been carried out staged operation is described in the present embodiment.Here suppose that transmission block is divided into two segmentations, and the hypothesis upstream control signaling is distributed to uniformly in all SCFDMA symbols.
As shown in Figure 9, when sending upstream data and upstream control signaling simultaneously, a part of RE is used for control channel, and first segmentation is transmitted on the SCFDMA of the front portion of TTI symbol, the invariable number of the RE that it takies, the number of resources that takies during promptly with control channel not is identical; And the decreased number of the RE that second RE takies.According to method of the present invention, segmentation # 2 can be the segmentation of having added filling bit.
According to the reference signal structure in the up TTI as shown in Figure 5, channel estimating can be in receiving TTI be carried out after the reference signal of first time slot at once in the base station, and after receiving all modulation symbols of segmentation # 1, it is decoded; Next, after the reference signal of second time slot of base station in receiving TTI, utilize two reference signal symbols in the TTI to carry out channel estimating again, thus utilize this more the precise channels estimated value segmentation # 2 is decoded.
The 5th embodiment
The present invention divides the resource that is used in control channel in uplink data channels method is described in the present embodiment.Subframe structure with the general CP of LTE Class1 is an example below, described method also can be used to extend CP structure and LTE type 2 systems.In below describing each SCFDMA symbol in the TTI from left to right is numbered, and leftmost symbol be numbered #0.The numbering of the symbol of two transmission of reference signals in the TTI is respectively #3 and #10.
As shown in figure 10, in example one, (#4～#9) is used to transmit upstream control signaling to the SCFDMA symbol in the TTI between the symbol of two transmission of reference signals.In example two, suppose that first symbol of TTI may be used to transmit CS-RS, then upstream control signaling is fixed on SCFDMA symbol (#1～#2, #4～#9, #11～#13) middle transmission.In example three, suppose that last symbol of TTI may be used to transmit CS-RS, then upstream control signaling is fixed on SCFDMA symbol (#0～#2, #4～#9, #11～#12) middle transmission.In example four, upstream control signaling is fixed on SCFDMA symbol (#1～#2, #4～#9, #11～#12) middle transmission.
The 6th embodiment
Describing the method for the CP length of each SCFDMA symbol in the collocating uplink subframe of the present invention in the present embodiment, is example with the subframe structure of the general CP of LTE Class1.Below be the sampling number that example is described CP with sampling frequency 30.72MHz, the sampling number of the system of other sampling frequencys can correspondingly obtain according to the ratio of sampling frequency.According among the current LTE to the discussion result of CP length, comprise 7 SCFDMA symbols in the time slot of the general CP of LTE Class1, one of them symbol has long CP, comprises 160 sampling, approximately is 5.21 μ s; And the CP length of other six symbols is short slightly, comprises 144 sampling, approximately is 4.69 μ s.
As shown in figure 11, each subframe is amounted to 14 SCFDMA symbols and is formed by two time slots.First SCFDMA symbol of subframe, first SCFDMA symbol of first time slot just, the i.e. CP that symbol # 0 configuration is long slightly, i.e. 160 sampling; Last SCFDMA symbol of subframe, last SCFDMA symbol of second time slot just, the i.e. CP that symbol # 13 configuration is long slightly, i.e. 160 sampling; Other 12 CP that the configuration of SCFDMA symbol is short slightly, i.e. 144 sampling.When needs sent CS-RS, last SCFDMA symbol of subframe was used to send CS-RS.Upstream data. signals sends from first SCFDMA sign-on in the subframe.Uplink control signal sends from first SCFDMA sign-on in the subframe.
The 7th embodiment
Describe the method that the present invention transmission is used for the reference signal (CS-RS) of channel measurement in the present embodiment, the subframe structure with the general CP of LTE Class1 is an example below, described method also can be used to extend CP structure and LTE type 2 systems.
As shown in figure 12, two SCFDMA symbols of the intersection of two adjacent subframes, promptly first SCFDMA symbol of last SCFDMA symbol of n subframe and n+1 subframe is used to transmit CS-RS.Like this, to having only the subscriber equipment of a power amplifier, the base station can dispose it and be respectively different antenna transmission CS-RS on two continuous SCFDMA symbols.
Claims (18)
1. one kind is carried out the method for rate-matched to upstream data, comprises step:
A) subscriber equipment is encoded to upstream data;
B) subscriber equipment carries out rate-matched according to the sum of removing the remaining RE of RE that type #1 control signaling takies in the uplink data channels to upstream data, obtains bit stream R1;
C) number of the RE that takies according to type #2 control signaling of subscriber equipment is punched to bit stream R1.
2. method according to claim 1 is characterized in that in step b) type #1 upstream control signaling comprises CQI.
3. method according to claim 1 is characterized in that in step c) type #2 upstream control signaling comprises ACK/NACK.
4. the method for a mapping uplink data channel comprises step:
A) subscriber equipment is encoded to upstream data;
B) subscriber equipment carries out rate-matched to the bit after encoding, and remembers that the set of the bit that need destroy when transport-type #2 upstream control signaling is B
C, the set of other bits is B
D
C) with whether to send upstream control signaling irrelevant, subscriber equipment is fixing set B
DBit be mapped to set A
DOn the interior RE, here, the set that note may be used for the RE of control channel is A
C, the set that note is fixed for the RE of transfer of data is A
D
5. method according to claim 4 is characterized in that in step b), and the method for described rate-matched is based on the speed matching method of cyclic buffer.
6. method according to claim 4 is characterized in that in step b) set B
CBit belong to the check digit of encoder output.
7. method according to claim 4 is characterized in that in step c), and when subscriber equipment thought that type #2 upstream control signaling is gone up in the needs transmission, subscriber equipment was mapped to set A after it is encoded
COn the interior RE.
8. method according to claim 4 is characterized in that in step c), when subscriber equipment is thought when not needing transmission types #2 upstream control signaling, set B
CBit be mapped to set A
COn the interior RE.
9. the method for the data channel of mapping uplink during to the transmission block segmentation comprises the steps:
A) subscriber equipment is to the transmission block segmentation, and encodes respectively;
B) when needs send upstream control signaling, the RE number minimizing N that segmentation takies
CIndividual, N here
CIt is the number of the RE that takies of upstream control signaling;
C) bit of subscriber equipment after to the coding of each segmentation carries out rate-matched.
D) subscriber equipment carries out the physical resource mapping to each segmentation.
10. method according to claim 9 is characterized in that in step b), and the segmentation that the RE number reduces is the segmentation of having added filling bit.
11. method according to claim 10 is characterized in that, when the bit behind the coding of this segmentation is carried out rate-matched, preferentially destroys the bit of unnecessary check digit #2.
12. method according to claim 9 is characterized in that in step d), the segmentation that the RE number reduces is mapped to the rear portion transmission of TTI.
13. a method of distributing the uplink control signaling resource comprises step:
A) subscriber equipment is encoded to upstream control signaling;
B) subscriber equipment is mapped to upstream control signaling on the SCFDMA symbol between the symbol of two transmission of reference signals of a TTI and transmits.
14. the method for a collocating uplink subframe structure comprises the steps:
A) the long slightly CP of first SCFDMA symbol configuration of sub-frame of uplink;
B) CP that configuration is lacked slightly from second SCFDMA symbol to penult SCFDMA symbol in the sub-frame of uplink;
C) the long slightly CP of last SCFDMA symbol configuration of sub-frame of uplink.
15. method according to claim 14 is characterized in that in step a), upstream data. signals sends from first SCFDMA sign-on in the subframe.
16. method according to claim 14 is characterized in that in step a), when needs send CS-RS, transmits on last SCFDMA symbol of subframe.
17. a transmission is used for the method for the reference signal of channel measurement, comprises step:
A) first SCFDMA symbol of last SCFDMA symbol of n subframe of base station configuration and n+1 subframe is used to transmit CS-RS;
B) the SCFDMA symbol that is used for CS-RS carries out duplicate allocation every k subframe, and wherein, k is more than or equal to 0.
18. method according to claim 17 is characterized in that, to having only the subscriber equipment of a power amplifier, it is respectively different antenna transmission CS-RS base station configuration on two continuous SCFDMA symbols.
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|---|---|---|---|
| CNA2007101261649A CN101325739A (en) | 2007-06-14 | 2007-06-14 | Method for transmitting upstream data and upstream control signaling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101261649A CN101325739A (en) | 2007-06-14 | 2007-06-14 | Method for transmitting upstream data and upstream control signaling |
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| CNA2007101261649A Pending CN101325739A (en) | 2007-06-14 | 2007-06-14 | Method for transmitting upstream data and upstream control signaling |
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