CN101594211A - Send the method for correct/error response message in the multicarrier system of big bandwidth - Google Patents
Send the method for correct/error response message in the multicarrier system of big bandwidth Download PDFInfo
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Abstract
A kind of method that sends correct/error response message, being suitable for terminal in the multicarrier system of big bandwidth carries out correct/error and replys, comprise: according to the carrier aggregation configuration information in the multicarrier system, detect configuration and give each downlink component carrier of terminal, obtain the correct/error response message HARQ_ACK (i) of each downlink component carrier; Terminal according to the assembled state of the correct/error response message of downlink component carrier HARQ_ACK (0), HARQ_ACK (1) ..., HARQ_ACK (M-1) }, select an available Physical Uplink Control Channel n
PUCCH (1), the form 1b of employing Physical Uplink Control Channel PUCCH sends the correct/error response message information of 2 bits, is designated as b (0) b (1); Wherein, the number that M gives the downlink component carrier of terminal for configuration, described available Physical Uplink Control Channel is one of M Physical Uplink Control Channel corresponding with M downlink component carrier, promptly
, i=0,1 ..., M-1.
Description
Technical field
The present invention relates to digital communicating field, particularly relate to the method that sends correct/error response message in the multicarrier system under a kind of big bandwidth.
Background technology
The develop rapidly of digital communication system is had higher requirement to reliability of data communication, yet under abominable channel, especially in high data rate or high-speed mobile environment, multipath interference and Doppler frequency shift etc. seriously affect systematic function.Therefore, effective error-control technique, (Hybrid Automatic Repeat Request, HARQ) technology just becomes the focus that the communications field endeavours to study especially to mix automatic request retransmission.
In the HARQ mode, the sign indicating number that sends of making a start not only can error detection, but also has certain error correcting capability.After the receiving terminal decoder is received code word, at first check error situation,, then carry out error correction automatically if in the error correcting capability of sign indicating number; If mistake is a lot, surpassed the error correcting capability of sign indicating number, come out but can detect mistake, then receiving terminal is given to make a start by feedback channel and is sent a decision signal, and requirement is made a start and is retransmitted corresponding codeword information.At OFDM (Orthogonal Frequency Division Multiplexing, OFDM) in the system, represent the correct or mistake of transmission by correct response message/error response message (ACK/NACK:Acknowledgement/Negative Acknowledgement) control signaling, and need to judge whether to retransmit with this.
In the descending HARQ of long evolving system (LTE:Long Term Evolution), the ACK/NACK response message of Physical Downlink Shared Channel (PDSCH:Physical Downlink Shared Channel), when terminal (UE:User Equipment) does not have Physical Uplink Shared Channel (PUSCH:Physical Uplink Shared Channel), be that capable physically control channel (PUCCH:PhysicalUplink Control Channel) is gone up transmission.When PDSCH only comprised a transmission block, terminal will be fed back the ACK/NACK response message of 1 bit, and when PDSCH comprised two transmission blocks, terminal will be fed back the ACK/NACK response message of 2 bits.LTE has defined multiple PUCCH form (format), comprises PUCCH format 1/1a/1b and format 2/2a/2b, and wherein format 1a and 1b are used for feeding back the ACK/NACK response message of 1 bit and the ACK/NACK response message of 2 bits respectively.
In FDD (Frequency Division Duplexing (FDD)) system, because ascending-descending subframes is one to one, therefore, a sub-frame of uplink only feeds back the ACK/NACK response message of a corresponding PDSCH of descending sub frame, according to the bit number of feedback, select PUCCH format 1a or 1b to send and get final product.
And in TDD (time division duplex) system, because the proportion of ascending subframe and descending subframe relation is configurable, therefore, when the descending sub frame number occurring and count, just there is a sub-frame of uplink need feed back the situation of the ACK/NACK response message of the corresponding PDSCH of a plurality of descending sub frames greater than sub-frame of uplink.Current LTE has defined two kinds of feedback models: binding pattern (bundling) and multiplexer mode (Multiplexing).
For binding pattern, terminal UE will be carried out bindings (bundling to the ACK/NACK response message of detected each subframe corresponding codewords stream, also claim the logical operation, have only when whole ACK/NACK response messages are ACK, the binding back is ACK, otherwise be NACK), obtain corresponding 1 bit (situation of corresponding 1 streams of code words) or 2 bits (situations of corresponding 2 streams of code words) information, then with the physical downlink control channel PDCCH corresponding physical ascending control channel PUCCH of last detected descending sub frame on, adopt the bit information after format 1a or 1b send binding.
For multiplexer mode, terminal UE determines that according to the proportionate relationship of up-downgoing this sub-frame of uplink needs the number M (just the ACK/NACK response message need be also referred to as the feedback window at the descending sub frame number of this sub-frame of uplink feedback) of feeding back ACK/NACK response message; Respectively the ACK/NACK response message of the streams of code words of each subframe in the feedback window is carried out bindings then, obtain M the feedback states after the binding; According to default feedback states and the relation of available PUCCH channel and b (0) b (1), select an available Physical Uplink Control Channel PUCCH then, adopt format 1b to send b (0) b (1).This mode is also referred to as channel and selects.
At the international mobile communication of advanced person (International MobileTelecommunications-Advanced, abbreviate IMT-Advanced as) in the system, can realize the high-speed transfer of data, and have bigger power system capacity: under the situation about move at low speed, focus covering, the peak rate of IMT-Advanced system can reach 1Gbit/s; Under the situation that high-speed mobile, wide area cover, the peak rate of IMT-Advanced system can reach 100Mbit/s.
In order to satisfy (the International TelecommunicationUnion-Advanced of advanced International Telecommunications Union, abbreviate ITU-Advanced as) requirement, senior Long Term Evolution (Long Term Evolution Advanced as the evolution standard of LTE, abbreviating LTE-A as) system need support bigger system bandwidth (reaching as high as 100MHz), and need the existing standard of backward compatibility LTE.On the basis of prior LTE system, the bandwidth of LTE system can be merged and obtain bigger bandwidth, this technology is called carrier aggregation (Carrier Aggregation, abbreviate CA as) technology, the availability of frequency spectrum, alleviation frequency spectrum resource that this technology can improve the IMT-Advance system are in short supply, and then optimize the utilization of frequency spectrum resource.
After introducing carrier aggregation, current about downlink component carrier and Physical Downlink Shared Channel PDSCH transmission block and mix in the discussion of automatic request retransmission HARQ process relation, a groundwork supposition is: when not adopting space division multiplexing, a corresponding PDSCH transmission block of downlink component carrier and a HARQ process, that is to say that UE need feed back the ACK/NACK response message of 1 bit for a PDSCH transmission block of each component carrier.
In the LTE-A system after having adopted the spectrum aggregating technology, upstream bandwidth and downlink bandwidth just can comprise a plurality of component carriers.When the base station all has scheduling to give the PDSCH of certain UE on a plurality of downlink component carriers, and when UE when current subframe does not have PUSCH to send, terminal need be fed back the ACK/NACK response message that the PDSCH of these a plurality of downlink component carriers transmits on PUCCH.A kind of direct method is exactly on a plurality of PUCCH channels corresponding with a plurality of downlink component carriers, adopts with the identical mode of LTE, feeds back a plurality of ACK/NACK response messages respectively.This method is fairly simple, can be good at keeping the compatibility with LTE, but owing to uply have a plurality of PUCCH channels to transmit simultaneously, destroyed uplink single-carrier property, when the UE power limited, will influence the detection performance of ACK/NACK, perhaps cause up covering performance to descend.To this, different company has proposed a lot of methods, feeds back on single PUCCH channel as the ACK/NACK response message of a plurality of descending carriers being carried out bindings (logical computing just) back.Because the channel of each carrier wave differs may be bigger, therefore, the method that the ACK/NACK response message binding of a plurality of descending carriers is fed back makes that throughput decline problem is more serious.
In addition, the method that also has a kind of channel based on the TDD system to select, the core concept of this method are exactly to utilize different modulation symbol on different PUCCH channels and this channel to represent the different feedback states of all carrier waves.Therefore this method does not exist the problem of destroying single-carrier property owing to only feed back on a PUCCH channel, the throughput decline problem of having avoided binding method to bring simultaneously, so this method is subjected to the support of a plurality of companies.But a major defect of this method is, if directly use the mapping method in the TDD system, 4 downlink component carriers can only be dispatched to UE simultaneously at most in the base station, and consider at present about can supporting 100MHz on the system bandwidth problem of carrier aggregation at most, so the situation of 5 component carriers is arranged after the carrier aggregation.And in the top-priority typical application scenarios, can support the polymerization of 5 component carriers about needs at most in the carrier aggregation of current LTE-A, therefore, when 5 downlink component carriers have been dispatched to UE in the base station, need the new mapping ruler of design.
Thereby, in the multicarrier system of big bandwidth, need a kind of method that in this system, sends correct/error response message on the capable physically control channel, solve the transmission problem of how to carry out correct/error response message under the big bandwidth under a plurality of downlink component carrier situations.
Summary of the invention
Technical problem to be solved by this invention is, the method that sends correct/error response message on the Physical Uplink Control Channel in a kind of multicarrier system under big bandwidth is provided, when being used to realize the situation of a plurality of downlink component carriers under the big bandwidth to the correct transmission of correct/error response message.
In order to address the above problem, the present invention proposes a kind of method that sends correct/error response message, be suitable for terminal in the multicarrier system of big bandwidth and carry out correct/error and reply, comprising:
According to the carrier aggregation configuration information in the multicarrier system, detect each downlink component carrier that terminal is given in configuration, obtain the correct/error response message HARQ_ACK (i) of each downlink component carrier;
Terminal according to the assembled state of the correct/error response message of downlink component carrier HARQ_ACK (0), HARQ_ACK (1) ..., HARQ_ACK (M-1) }, select an available Physical Uplink Control Channel n
PUCCH (1), the form 1b of employing Physical Uplink Control Channel PUCCH sends the correct/error response message information of 2 bits, is designated as b (0) b (1);
Wherein, the number that M gives the downlink component carrier of terminal for configuration, described available Physical Uplink Control Channel is one of M Physical Uplink Control Channel corresponding with M downlink component carrier, promptly
i＝0，1，...，M-1。
In addition, described terminal detects when disposing each downlink component carrier of giving terminal,
At first, the physical downlink control channel PDCCH to each downlink component carrier detects;
Then,, the Physical Downlink Shared Channel PDSCH on each component carrier is carried out demodulation, thereby obtain the correct/error response message HARQ_ACK (i) of each downlink component carrier according to the physical downlink control channel PDCCH information that demodulation is come out.
In addition, the correct/error response message HARQ_ACK (i) of each downlink component carrier of obtaining of described terminal is one of following three kinds of states:
ACK, the expression terminal correctly receives the Physical Downlink Shared Channel PDSCH on the component carrier i;
NACK, the expression terminal does not correctly receive the Physical Downlink Shared Channel PDSCH on the component carrier i;
DTX, the expression terminal does not correctly receive the physical downlink control channel PDCCH on the component carrier i and can't correctly demodulate Physical Downlink Shared Channel PDSCH or base station and give terminal scheduling Physical Downlink Shared Channel PDSCH in current subframe on downlink component carrier i.
In addition, if the multicarrier system of described big bandwidth is FDD system, the mode that described terminal is obtained the correct/error response message HARQ_ACK (i) of downlink component carrier i is:
When terminal detects this downlink component carrier i and comprises two streams of code words, the response message HARQ_ACK (i) of this downlink component carrier i correspondence is defined as: the correct/error response message of described two streams of code words carries out resulting response message after the logical AND operation;
When terminal detects this downlink component carrier i and has only a streams of code words, the response message HARQ_ACK (i) of this downlink component carrier i correspondence is defined as: the correct/error response message of this streams of code words;
When terminal detects on this downlink component carrier i when sending data to terminal, the response message HARQ_ACK (i) of this downlink component carrier i correspondence is defined as: NACK or DTX.
In addition, if the multicarrier system of described big bandwidth is TDD system, the mode that described terminal is obtained the correct/error response message HARQ_ACK (i) of downlink component carrier i is:
When the sub-frame of uplink of the upstream components carrier wave of this downlink component carrier i correspondence need feed back the correct/error response message of a plurality of descending sub frames, terminal is carried out the logical AND operation to the correct/error response message of a plurality of descending sub frames of each streams of code words correspondence of this downlink component carrier, obtain the correct/error response message after the binding between subframe, this process is called " binding between subframe ";
Thereby, when if terminal detects this downlink component carrier i and comprises two streams of code words, the correct/error response message that terminal has obtained having carried out described " binding between subframe " operation carries out i.e. " binding between streams of code words " operation of logical AND operation of described two streams of code words again, thereby obtains the correct/error response message HARQ_ACK (i) of this downlink component carrier;
Thereby, if terminal detects this downlink component carrier i when only comprising a streams of code words, terminal is determined to have carried out described " binding between subframe " and is operated and the correct/error response message that obtains is the correct/error response message HARQ_ACK (i) of this downlink component carrier;
Wherein, in carrying out described " binding between subframe " operation,, suppose that its correct/error response message is ACK if when sending data in the descending sub frame of this downlink component carrier i this terminal;
When not sending data to terminal on this downlink component carrier i, then terminal determines that the feedback states of the correct/error response message of this this downlink component carrier i correspondence is NACK or DTX.
In addition, an available Physical Uplink Control Channel n selecting of described terminal
PUCCH (1), be that terminal can obtain or by according to the Physical Downlink Control Channel that correctly receives and implicit the obtaining between the Physical Uplink Control Channel index by signaling method; The correct/error response message of the downlink component carrier of this Physical Uplink Control Channel PUCCH correspondence is necessary for non-DTX state, is ACK state or NACK state.
In addition, the assembled state of the correct/error response message of the M that described terminal an is obtained downlink component carrier HARQ_ACK (0), HARQ_ACK (1) ..., HARQ_ACK (M-1) } the available Physical Uplink Control Channel n that selects with described terminal
PUCCH (1)And have default mapping relations between the transmission form that is adopted;
Described terminal is according to should default mapping relations determining the Physical Uplink Control Channel n that this is available
PUCCH (1)
The form 1b that described transmission form is Physical Uplink Control Channel PUCCH goes up 2 bit b (0) b (1) that send.
In addition, described default mapping relations are relevant with the value of M; When M=1, represent that described system does not adopt carrier aggregation technology, then terminal adopts and has now the feedback method of up correct/response message of Long Term Evolution LTE systems compliant.
In addition, described default mapping relations are relevant with the value of M; When M=2/3/4/5, described default mapping relations satisfy following design principle:
Principle 1: when HARQ-ACK (0), HARQ-ACK (1) ..., HARQ-ACK (M-1) } in the number N of ACK state during greater than zero and less than M, then merge NACK and DTX state on other component carriers of non-ACK state;
Principle 2: as { HARQ-ACK (0), HARQ-ACK (1), ..., HARQ-ACK (M-1) } in the number of ACK state be 0 o'clock, select one can correctly demodulation physical downlink control channel PDCCH the pairing Physical Uplink Control Channel PUCCH of component carrier feed back, promptly the feedback states of the correct/error response message of the component carrier of this Physical Uplink Control Channel PUCCH correspondence is necessary for NACK, remerges NACK and DTX state on other component carriers;
Principle 3: when the feedback states of the correct/error response message on all downlink component carriers all was DTX, terminal did not send any signal to the base station;
Principle 4: when the number M of descending component carrier=4,, the state that obtains according to described principle 1 is further merged, the partial status of N=3 and N=2 is merged according to the number of N; When the number M of descending component carrier=5, number according to N, the state that obtains according to described principle 1 is further merged, the partial status of N=1 and N=2 is merged, the partial status of the remainder of N=2 and the partial status of N=3 are merged, with the state merging of remaining part state with the N=4 of N=3; When number M=5 of descending component carrier, and during N=0, if HARQ-ACK (0), HARQ-ACK (1) ..., HARQ-ACK (M-1) } in when having the correct/error response message of 4 component carriers to be the DTX state, terminal does not send any signal to the base station.
Adopt correct/error response message sending method of the present invention, terminal can also be fed back the feedback information on the received downlink component carrier, thereby can not cause decline of system throughput performance on the basis of the feedback system of the existing LTE of compatibility.Simultaneously, terminal can adopt the feedback information of each downlink component carrier of PUCCH channel feedback, thereby has kept up single carrier, and this is particularly important for covering limited terminal UE.In addition, owing to adopted default mapping relations of the present invention, also solve the feedback problem of uplink ACK/NACK response message in all typical application scenarioss of carrier aggregation of current LTE-A definition, had sufficient fault-tolerant compatibility.
Description of drawings
Fig. 1 is the process chart that terminal sends the ACK/NACK response message;
Fig. 2 is the schematic diagram that terminal obtains the ACK/NACK response message of each downlink component carrier in the FDD system;
Fig. 3 is the schematic diagram that terminal obtains the ACK/NACK response message of each downlink component carrier in the TDD system;
Fig. 4 is the specific design schematic flow sheet of default mapping relations design principle when adopting M=2/3/4/5;
Fig. 5～Fig. 8 is when M=5/4/3/2, the assembled state of the ACK/NACK response message of downlink component carrier { HARQ_ACK (0), HARQ_ACK (1), ..., HARQ_ACK (M-1) } with available PUCCH channel of selecting and PUCCH form 1b in the specific embodiment signal chart of default mapping relations of 2 bit information b (0) b (1).
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
In the system that has adopted carrier aggregation technology, when the base station all has scheduling to give the PDSCH of certain UE on M downlink component carrier, and when UE when current subframe does not have PUSCH to send, terminal need be fed back the ACK/NACK response message of the PDSCH transmission of this M downlink component carrier on PUCCH.At the multicarrier system of the big bandwidth that adopts carrier aggregation technology, still there is not the problem of the feedback method of preferable correct/error response message at present, the invention provides a kind of method of corresponding transmission correct/error response message.
When the present invention is intended to provide UE and adopts the method for selecting based on channel to carry out the ACK/NACK feedback, mapping relations between 2 bit information b (0) b (1) that carry on the combinations of states of the ACK/NACK response message of M downlink component carrier and the PUCCH channel of selection and this channel, and adopt described mapping relations to carry out the method for ACK/NACK response message feedback.
For convenience of description, suppose that the ACK/NACK response message on the downlink component carrier i is expressed as HARQ_ACK (i), i=0 wherein, 1, ..., M-1, M are the number that certain moment base station configuration is given the downlink component carrier of UE, HARQ_ACK (i) ∈ { ACK, NACK, DTX}; Wherein:
ACK represents that UE correctly receives the PDSCH on the component carrier i,
NACK represents that UE does not correctly receive the PDSCH on the component carrier i,
DTX represent UE correctly do not receive the PDCCH on the component carrier i thereby can't correctly demodulate PDSCH or the base station current subframe on downlink component carrier i to UE scheduling PDSCH.
Terminal UE is n according to the channel indexes that the physical downlink control channel PDCCH on component carrier i obtains the available PUCCH channel of its correspondence
PUCCH, i (1), the assembled state of the ACK/NACK response message of the M that UE need a feed back downlink component carrier can be expressed as HARQ_ACK (0), HARQ_ACK (1) ..., HARQ_ACK (M-1) }; PUCCH form 1b goes up the dibit information that sends and is designated as b (0) b (1);
The main thought that sends the ACK/NACK response message among the present invention comprises: terminal UE detects configuration and gives its each downlink component carrier according to the carrier aggregation configuration information, obtains the ACK/NACK response message HARQ_ACK (i) of each downlink component carrier; According to the assembled state of the ACK/NACK response message of M downlink component carrier HARQ_ACK (0), HARQ_ACK (1) ..., HARQ_ACK (M-1) }, select an available PUCCH channel n
PUCCH (1), adopt PUCCH form 1b to send 2 bit information b (0) b (1), described available PUCCH channel is
i＝0，1，...，M-1.
Fig. 1 has provided and has adopted UE of the present invention to send the handling process of ACK/NACK response message:
Step 101, UE at first detects the PDCCH of each downlink component carrier.
Step 102, the PDCCH information that UE comes out according to demodulation is carried out demodulation to the PDSCH on each component carrier.
Step 103, UE obtains the ACK/NACK response message of each downlink component carrier according to the demodulation result of PDSCH;
Step 104, UE is according to the assembled state { HARQ_ACK (0) of the ACK/NACK response message of M the downlink component carrier that obtains in step 103, HARQ_ACK (1), ..., HARQ_ACK (M-1) }, adopt default mapping relations of the present invention, select a PUCCH channel, adopt PUCCH form 1b to send corresponding 2 bit information b (0) b (1).
In the described step 103, for the terminal of FDD system and TDD system, the mode that corresponding terminal UE obtains the ACK/NACK response message HARQ_ACK (i) of certain downlink component carrier is different.
For the FDD system:
When UE detected certain downlink component carrier and comprises two streams of code words, the ACK/NACK that its corresponding response message is two streams of code words carried out the response message that obtains after the logical AND operation;
Obtain certain downlink component and carry when having only a streams of code words when UE detects, its corresponding response message is the response message of the ACK/NACK of this streams of code words;
When not sending data to UE on certain component carrier, its corresponding feedback states is NACK or DTX.
Fig. 2 has provided in the step 103 of Fig. 1, and UE obtains the schematic diagram of the ACK/NACK response message of each downlink component carrier in the FDD system.Specific as follows described:
For component carrier # 0, because UE detects 2 streams of code words on this component carrier, therefore, UE need carry out the logical AND operation to the ACK/NACK response message of 2 streams of code words on this component carrier, a response message after obtaining binding is designated as HARQ-ACK (0) here;
For component carrier # 1, because UE only detects 1 streams of code words on this component carrier,, therefore, the feedback states of correspondence is designated as HARQ-ACK (1) for the ACK/NACK response message of streams of code words # 0 on it on this component carrier;
For component carrier # 2, because UE detects 2 streams of code words on this component carrier, therefore, UE need carry out the logical AND operation to the ACK/NACK response message of 2 streams of code words on this component carrier, a response message after obtaining binding is designated as HARQ-ACK (2) here;
For component carrier # 3, because UE detects 2 streams of code words on this component carrier, therefore, UE need carry out the logical AND operation to the ACK/NACK response message of 2 streams of code words on this component carrier, a response message after obtaining binding is designated as HARQ-ACK (3) here;
For component carrier # 4, because UE detects 2 streams of code words on this component carrier, therefore, UE need carry out the logical AND operation to the ACK/NACK response message of 2 streams of code words on this component carrier, a response message after obtaining binding is designated as HARQ-ACK (4) here.
For the TDD system:
When the sub-frame of uplink of the upstream components carrier wave of certain downlink component carrier correspondence need feed back the ACK/NACK response message of a plurality of descending sub frames, UE need carry out the logical AND operation to the ACK/NACK response message of a plurality of descending sub frames of each streams of code words correspondence of this downlink component carrier, obtains the ACK/NACK response message after the binding between subframe; This process is called " binding between subframe ";
● when UE detects certain downlink component carrier and comprises 2 streams of code words, the ACK/NACK response message that UE need obtain after above-mentioned " binding between subframe " operation is carried out " binding between streams of code words " operation again, thereby obtains the ACK/NACK response message HARQ_ACK (i) of this downlink component carrier;
● obtain certain downlink component and carry when having only a streams of code words when UE detects, its corresponding response message " is bound " response message of the ACK/NACK that obtains after the operation between subframe for this streams of code words
● in the middle of " binding between subframe " operation,, suppose that its ACK/NACK response message is ACK if when not giving these UE transmission data in certain descending sub frame;
When not sending data to UE on certain component carrier, its corresponding feedback states is NACK or DTX.
Fig. 3 has provided in the step 103 of Fig. 1, and UE obtains the schematic diagram of the ACK/NACK response message of each downlink component carrier in the TDD system.Specific as follows described: as to suppose that here a sub-frame of uplink need feed back 4 descending sub frame ACK/NACK response messages:
For component carrier # 0, because UE detects 2 streams of code words on this component carrier, therefore, UE need carry out " binding between subframe " operation earlier to the ACK/NACK response message of 2 corresponding descending sub frames of streams of code words on this component carrier, and then carry out " binding between streams of code words " and operate, a response message after obtaining at last binding is designated as HARQ-ACK (0) here; When carrying out " binding between subframe " operation, for streams of code words # 1, owing to do not send data to UE at descending sub frame # 1, therefore, when carrying out " binding between subframe " operation, the response message of this descending sub frame is assumed to be ACK;
For component carrier # 1, because UE only detects 1 streams of code words on this component carrier, UE need carry out " binding between subframe " operation to the ACK/NACK response message of the corresponding descending sub frame of streams of code words # 0 on this component carrier, thereby a response message after obtaining binding is designated as HARQ-ACK (1) here;
For component carrier # 2, because UE detects 2 streams of code words on this component carrier, therefore, UE need carry out " binding between subframe " operation earlier to the ACK/NACK response message of 2 corresponding descending sub frames of streams of code words on this component carrier, and then carry out " binding between streams of code words " and operate, a response message after obtaining at last binding is designated as HARQ-ACK (2) here; When carrying out " binding between subframe " operation, for streams of code words # 1, owing to do not send data to UE at descending sub frame # 2, therefore, when carrying out " binding between subframe " operation, the response message of this descending sub frame is assumed to be ACK;
For component carrier # 3, because UE detects 2 streams of code words on this component carrier, therefore, UE need carry out " binding between subframe " operation earlier to the ACK/NACK response message of 2 corresponding descending sub frames of streams of code words on this component carrier, and then carry out " binding between streams of code words " and operate, a response message after obtaining at last binding is designated as HARQ-ACK (3) here;
For component carrier # 4, because UE does not detect the data of distributing to it on this component carrier, therefore, the ACK/NACK response message HARQ-ACK (4) of component carrier # 4 correspondence is NACK or DTX.
In the described step 104 of Fig. 1, available PUCCH channel is that UE can obtain, be to obtain or to obtain according to implicit between Physical Downlink Control Channel that correctly receives and the PUCCH channel indexes specifically, that is to say that the ACK/NACK response message of the downlink component carrier corresponding with this PUCCH channel is necessary for non-DTX state by means of signaling.
In the described step 104 of Fig. 1, PUCCH channel of selecting and PUCCH form 1b go up 2 bit b (0) b (1) of transmission and the assembled state { HARQ_ACK (0) of the ACK/NACK response message of M downlink component carrier, HARQ_ACK (1), ..., HARQ_ACK (M-1) } default mapping relations are arranged; Described preset relation is relevant with the value of M, specifically,
(do not adopt carrier aggregation technology) when M=1, the feedback method of uplink ACK/NACK response message is consistent with existing LTE system.
When M=2/3/4/5, following design principle is satisfied in its design:
Principle 1: as { HARQ-ACK (0), HARQ-ACK (1) ..., HARQ-ACK (M-1) in the number of ACK be that N is (during 0＜N＜M), then do not distinguish NACK and DTX state on all the other (M-N) individual component carriers, just merge NACK and DTX state on other component carriers;
Principle 2: as { HARQ-ACK (0), HARQ-ACK (1), ..., HARQ-ACK (M-1) } in the number of ACK be 0 o'clock, when just UE does not correctly receive the data of any downlink component carrier, the pairing PUCCH channel of component carrier of demodulation PDCCH feeds back with selecting correctly, just the ACK/NACK feedback states of the component carrier of the PUCCH channel correspondence of Xuan Zeing is necessary for NACK, do not distinguish NACK and DTX state on other component carriers then, just merge NACK and DTX state on other component carriers;
Principle 3: when the feedback states on all downlink component carriers all was DTX, UE did not send any signal to the base station;
Principle 4: when the number M of descending component carrier=4/5, because the status number that available PUCCH channel and the combination of b (0) b (1) can be expressed is less than { HARQ-ACK (0), HARQ-ACK (1), ..., HARQ-ACK (M-1) } possible combinations of states number, therefore, existence merges and (refers to different { HARQ-ACK (0), HARQ-ACK (1) ..., HARQ-ACK (M-1) combinations of states adopts identical PUCCH channel and b (0) b (1) combination to represent) situation:
● during for M=4,, the state that obtains in the described principle 1 is further merged according to the number of N, specifically, with the partial status merging of N=3 and N=2;
● during for M=5, number according to N, the state that obtains in the described principle 1 is further merged, specifically, the partial status of N=1 and N=2 is merged, the partial status of the remainder of N=2 and the partial status of N=3 are merged, with the state merging of remaining part state with the N=4 of N=3;
● during for M=5 and N=0, when HARQ-ACK (0), HARQ-ACK (1) ..., HARQ-ACK (M-1) } in when having the response message of 4 component carriers to be DTX, UE does not send any signal to the base station yet.
Fig. 4 has provided the specific design schematic flow sheet of default mapping relations design principle when adopting above-mentioned M=2/3/4/5, specifically describes as follows:
The statistics HARQ_ACK (0), HARQ_ACK (1) ..., HARQ_ACK (M-1) } in response message be the number of ACK, be designated as N;
When N=0, adopt above-mentioned principle 1 to carry out channel selection and state merging;
When N＞0, adopt above-mentioned principle 2 to carry out that channel is selected and the state merging;
At last, for the situation of M=4/5, adopt principle 4 to carry out further state and merge.
According to above design principle, default mapping relations of the present invention have following characteristics:
When M=2, after adopting principle 1 and principle 2 to carry out the state merging, (HARQ_ACK (0), HARQ_ACK (1)) status number is 5, and the number of combinations of available PUCCH channel and b (0) b (1) is 2*4=8, therefore, situation for M=2, the assembled state of PUCCH and b (0) b (1) counts up to the possible assembled state number of all-round enough expressions (HARQ_ACK (0), HARQ_ACK (1)), thereby the state that does not need to carry out principle 4 merges;
When M=3, after adopting principle 1 and principle 2 to carry out the state merging, (HARQ_ACK (0), HARQ_ACK (1), HARQ_ACK (2)) status number is 10, and the number of combinations of available PUCCH channel and b (0) b (1) is 3*4=12, therefore, and for the situation of M=3, the assembled state of PUCCH and b (0) b (1) counts up to all-round enough expression (HARQ_ACK (0), HARQ_ACK (1), HARQ_ACK (2)) possible assembled state number, thereby the state that does not need to carry out principle 4 merges;
When M=4, after adopting principle 1 and principle 2 to carry out the state merging, (HARQ_ACK (0), HARQ_ACK (1), HARQ_ACK (2), HARQ_ACK (3)) status number is 19, and the number of combinations of available PUCCH channel and b (0) b (1) is 4*4=16, therefore, and for the situation of M=4, the assembled state number of PUCCH and b (0) b (1) can not be represented (HARQ_ACK (0), HARQ_ACK (1), HARQ_ACK (2), HARQ_ACK (3)) whole may the assembled state numbers, thereby the state that need carry out principle 4 merges, and the partial status of N=3 and N=2 is merged;
When M=5, after adopting principle 1 and principle 2 to carry out the state merging, (HARQ_ACK (0), HARQ_ACK (1), HARQ_ACK (2), HARQ_ACK (3), HARQ_ACK (4)) status number is 36, and the number of combinations of available PUCCH channel and b (0) b (1) is 5*4=20, therefore, situation for M=4, the assembled state number of PUCCH and b (0) b (1) can not be represented (HARQ_ACK (0), HARQ_ACK (1), HARQ_ACK (2), HARQ_ACK (3), HARQ_ACK (4)) whole possibility assembled state numbers, thereby the state that need carry out principle 4 merges, the partial status of N=1 and N=2 is merged, the partial status of the remainder of N=2 and the partial status of N=3 are merged, with the state merging of remaining part state with the N=4 of N=3, like this, situation for N＞0, need altogether 16 kinds of different states of expression,, and 2 carry out having 5 kinds of situations after the state merging on principle because the number of combinations of available PUCCH channel and b (0) b (1) is 20,4 kinds of remaining situations can not these 5 kinds of situations of perfect representation, thereby as (HARQ_ACK (0), HARQ_ACK (1), HARQ_ACK (2), HARQ_ACK (3), the response message that 4 component carriers are arranged HARQ_ACK (4)) is DTX, and when the response message of 1 component carrier was NACK, UE did not send any signal to the base station yet.
When Fig. 5～Fig. 8 has provided M=5/4/3/2 of the present invention, the assembled state of the ACK/NACK response message of downlink component carrier { HARQ_ACK (0), HARQ_ACK (1), ..., HARQ_ACK (M-1) } with available PUCCH channel of selecting and PUCCH form 1b in the embodiment of default mapping relations of 2 bit information b (0) b (1).N/A among Fig. 5～Fig. 8 represents that UE does not send any signal to the base station.
Adopt sending method of the present invention, UE can feed back the feedback information on the received downlink component carrier, thereby can not cause decline of system throughput performance.Simultaneously, UE can adopt the feedback information of each downlink component carrier of PUCCH channel feedback, thereby has kept up single carrier, and this is particularly important for covering limited UE.In addition, adopt default mapping relations of the present invention, solved the feedback problem of uplink ACK/NACK response message in all typical application scenarioss of carrier aggregation of current LTE-A definition.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (9)
1, a kind of method that sends correct/error response message is suitable for terminal in the multicarrier system of big bandwidth and carries out correct/error and reply, and it is characterized in that, comprising:
According to the carrier aggregation configuration information in the multicarrier system, detect each downlink component carrier that terminal is given in configuration, obtain the correct/error response message HARQ_ACK (i) of each downlink component carrier;
Terminal according to the assembled state of the correct/error response message of downlink component carrier HARQ_ACK (0), HARQ_ACK (1) ..., HARQ_ACK (M-1) }, select an available Physical Uplink Control Channel n
PUCCH (1), the form 1b of employing Physical Uplink Control Channel PUCCH sends the correct/error response message information of 2 bits, is designated as b (0) b (1);
Wherein, the number that M gives the downlink component carrier of terminal for configuration, described available Physical Uplink Control Channel is one of M Physical Uplink Control Channel corresponding with M downlink component carrier, promptly
2, the method for claim 1 is characterized in that,
Described terminal detects when disposing each downlink component carrier of giving terminal,
At first, the physical downlink control channel PDCCH to each downlink component carrier detects;
Then,, the Physical Downlink Shared Channel PDSCH on each component carrier is carried out demodulation, thereby obtain the correct/error response message HARQ_ACK (i) of each downlink component carrier according to the physical downlink control channel PDCCH information that demodulation is come out.
3, method as claimed in claim 2 is characterized in that,
The correct/error response message HARQ_ACK (i) of each downlink component carrier that described terminal obtains is one of following three kinds of states:
ACK, the expression terminal correctly receives the Physical Downlink Shared Channel PDSCH on the component carrier i;
NACK, the expression terminal does not correctly receive the Physical Downlink Shared Channel PDSCH on the component carrier i;
DTX, the expression terminal does not correctly receive the physical downlink control channel PDCCH on the component carrier i and can't correctly demodulate Physical Downlink Shared Channel PDSCH or base station and give terminal scheduling Physical Downlink Shared Channel PDSCH in current subframe on downlink component carrier i.
4, method as claimed in claim 2 is characterized in that,
If the multicarrier system of described big bandwidth is FDD system, the mode that described terminal is obtained the correct/error response message HARQ_ACK (i) of downlink component carrier i is:
When terminal detects this downlink component carrier i and comprises two streams of code words, the response message HARQ_ACK (i) of this downlink component carrier i correspondence is defined as: the correct/error response message of described two streams of code words carries out resulting response message after the logical AND operation;
When terminal detects this downlink component carrier i and has only a streams of code words, the response message HARQ_ACK (i) of this downlink component carrier i correspondence is defined as: the correct/error response message of this streams of code words;
When terminal detects on this downlink component carrier i when sending data to terminal, the response message HARQ_ACK (i) of this downlink component carrier i correspondence is defined as: NACK or DTX.
5, method as claimed in claim 2 is characterized in that,
If the multicarrier system of described big bandwidth is TDD system, the mode that described terminal is obtained the correct/error response message HARQ_ACK (i) of downlink component carrier i is:
When the sub-frame of uplink of the upstream components carrier wave of this downlink component carrier i correspondence need feed back the correct/error response message of a plurality of descending sub frames, terminal is carried out the logical AND operation to the correct/error response message of a plurality of descending sub frames of each streams of code words correspondence of this downlink component carrier, obtain the correct/error response message after the binding between subframe, this process is called " binding between subframe ";
Thereby, when if terminal detects this downlink component carrier i and comprises two streams of code words, the correct/error response message that terminal has obtained having carried out described " binding between subframe " operation carries out i.e. " binding between streams of code words " operation of logical AND operation of described two streams of code words again, thereby obtains the correct/error response message HARQ_ACK (i) of this downlink component carrier;
Thereby, if terminal detects this downlink component carrier i when only comprising a streams of code words, terminal is determined to have carried out described " binding between subframe " and is operated and the correct/error response message that obtains is the correct/error response message HARQ_ACK (i) of this downlink component carrier;
Wherein, in carrying out described " binding between subframe " operation,, suppose that its correct/error response message is ACK if when sending data in the descending sub frame of this downlink component carrier i this terminal;
When not sending data to terminal on this downlink component carrier i, then terminal determines that the feedback states of the correct/error response message of this this downlink component carrier i correspondence is NACK or DTX.
6, the method for claim 1 is characterized in that,
The available Physical Uplink Control Channel n that described terminal is selected
PUCCH (1), be that terminal can obtain or by according to the Physical Downlink Control Channel that correctly receives and implicit the obtaining between the Physical Uplink Control Channel index by signaling method; The correct/error response message of the downlink component carrier of this Physical Uplink Control Channel PUCCH correspondence is necessary for non-DTX state, is ACK state or NACK state.
7, the method for claim 1 is characterized in that,
The assembled state of the correct/error response message of the M that described terminal an is obtained downlink component carrier HARQ_ACK (0), HARQ_ACK (1) ..., HARQ_ACK (M-1) } the available Physical Uplink Control Channel n that selects with described terminal
PUCCH (1)And have default mapping relations between the transmission form that is adopted;
Described terminal is according to should default mapping relations determining the Physical Uplink Control Channel n that this is available
PUCCH (1)
The form 1b that described transmission form is Physical Uplink Control Channel PUCCH goes up 2 bit b (0) b (1) that send.
8, method as claimed in claim 7 is characterized in that, described default mapping relations are relevant with the value of M; When M=1, represent that described system does not adopt carrier aggregation technology, then terminal adopts and has now the feedback method of up correct/response message of Long Term Evolution LTE systems compliant.
9, method as claimed in claim 7 is characterized in that, described default mapping relations are relevant with the value of M; When M=2/3/4/5, described default mapping relations satisfy following design principle:
Principle 1: when HARQ-ACK (0), HARQ-ACK (1) ..., HARQ-ACK (M-1) } in the number N of ACK state during greater than zero and less than M, then merge NACK and DTX state on other component carriers of non-ACK state;
Principle 2: as { HARQ-ACK (0), HARQ-ACK (1), ..., HARQ-ACK (M-1) } in the number of ACK state be 0 o'clock, select one can correctly demodulation physical downlink control channel PDCCH the pairing Physical Uplink Control Channel PUCCH of component carrier feed back, promptly the feedback states of the correct/error response message of the component carrier of this Physical Uplink Control Channel PUCCH correspondence is necessary for NACK, remerges NACK and DTX state on other component carriers;
Principle 3: when the feedback states of the correct/error response message on all downlink component carriers all was DTX, terminal did not send any signal to the base station;
Principle 4: when the number M of descending component carrier=4,, the state that obtains according to described principle 1 is further merged, the partial status of N=3 and N=2 is merged according to the number of N; When the number M of descending component carrier=5, number according to N, the state that obtains according to described principle 1 is further merged, the partial status of N=1 and N=2 is merged, the partial status of the remainder of N=2 and the partial status of N=3 are merged, with the state merging of remaining part state with the N=4 of N=3; When number M=5 of descending component carrier, and during N=0, if HARQ-ACK (0), HARQ-ACK (1) ..., HARQ-ACK (M-1) } in when having the correct/error response message of 4 component carriers to be the DTX state, terminal does not send any signal to the base station.
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| PCT/CN2010/072824 WO2010145373A1 (en) | 2009-06-19 | 2010-05-17 | Method and terminal for transmitting acknowledgement/negative acknowledgement message |
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| Publication number | Publication date |
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| WO2010145373A1 (en) | 2010-12-23 |
| CN101594211B (en) | 2013-12-18 |
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