CN101478383B - Feedback method for downlink sub-frame response information in long-term evolution system - Google Patents
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Abstract
The invention discloses a feedback method of downlink sub-frame response messages in a long-term evolution system. The long-term evolution system works in the time division duplex mode. A terminal determines the size M of a feedback window corresponding to an uplink sub-frame, determines a response message of each downlink sub-frame in the feedback window when the M is an integer more than 1, and transmits the feedback information corresponding to the obtained M response messages in the multiplexing feedback mode on a physical unlink control channel, thereby solving the feedback problem of the downlink sub-frame response message when the M is more than 1 and the physical unlink control channel (PUCCH) employs the acknowledged/non-acknowledged (ACK/NACK) multiplexing feedback mode. The feedback method further comprises the feedback method of downlink sub-frame response message when the size of feedback window of an uplink sub-frame is equal to 1, and the method solves the feedback problem of the downlink sub-frame response message when the M is equal to 1 and the PUCCH employs the multiplexing feedback mode. The feedback method can accurately feedback the data reception result of the downlink sub-frame while reducing the false probability of the base station.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of on up channel the method for the response message of feeding back downlink subframe.
Background technology
In HARQ (Hybrid Automatic Repeat Request, mix automatic repeat request) mode, the code of making a start and sending, not only can error detection, but also has certain error correcting capability.Receiving terminal decoder is received after code word, first check error situation, if in the error correcting capability of code, automatically carry out error correction, if wrong a lot, surpassed the error correcting capability of code, but can detect mistake out, receiving terminal, by feedback channel to the decision signal of making a start, requires to make a start retransmission of information.At OFDM (Orthogonal Frequency Division Multiplex, OFDM) in system, by ack/nack, reply (Acknowledged/Non-acknowledged, ACK/NACK) control signal represents to transmit correct/error, with this, judges whether to need to retransmit.
Long Term Evolution (Long Term Evolution, referred to as LTE) system is the essential planning of third generation partnership, Fig. 1 shows the structural representation of basic frame structure in LTE system, wherein, frame structure is divided into radio frames, field, subframe, time slot and four grades of symbol, wherein, the length of a radio frames is 10ms, a radio frames is comprised of two fields, the length of each field is 5ms, and a field is comprised of 5 subframes, and the length of each subframe is 1ms, a subframe consists of two time slots, and the length of each time slot is 0.5ms.
When LTE system adopts regular circulation prefix, a time slot comprises the up/down row symbol that 7 length are 66.7us, and wherein, the circulating prefix-length of first symbol is 5.21us, and the circulating prefix-length of other 6 symbols is 4.69us.When LTE system adopts extended cyclic prefix, a time slot comprises the up/down row symbol that 6 length are 66.7us, and wherein, the circulating prefix-length of each symbol is 16.67us.
The form of the PUCCH of sub-frame of uplink (Physical Uplink Control Channel, Physical Uplink Control Channel) is divided into six kinds of format 1, format 1a, format 1b and format 2, format 2a, fomat2b, wherein:
Format 1b is for transmitting the ACK/NACK information of two streams of code words of 2 bits, the ACK/NACK information of each streams of code words correspondence 1 bit;
Format 2a is used for transmitting CQI/PMI and RI information, single codeword flow ACK/NACK information;
Format 2b is used for transmitting CQI/PMI and RI information, two streams of code words ACK/NACK information;
Format 2a and format 2b are the scene of regular circulation prefix for Cyclic Prefix.
Wherein, format 1, format 1a are the same with format 1b channel architecture, and format 1 is multiplied by a fixed modulation symbol 1 on data symbol, having or not to transmit and whether have SR information to send by format 1 channel; Format 1a is multiplied by a BPSK symbol on data symbol, by BPSK symbol transmission single codeword stream ACK/NACK information; Format 1b is multiplied by a QPSK symbol on data symbol, by the two streams of code words ACK/NACK information of QPSK symbol transmission; Format 2, format 2a are the same with format 2b channel architecture, and format 2 transmits CQI information on data symbol, on pilot tone (reference signal) symbol, do not send any information; , format 2a transmits CQI information on data symbol, on pilot tone (reference signal) symbol, is multiplied by a BPSK symbol, by BPSK symbol transmission single codeword stream ACK/NACK information; Format2b transmits CQI information on data symbol, on pilot tone (reference signal) symbol, is multiplied by a QPSK symbol, by the two streams of code words ACK/NACK information of QPSK symbol transmission.
2 bit informations for PUCCH format 1b transmission are defined as to b (0) and b (1).
In radio frames of tdd systems, there is various configurations in uplink and downlink timeslot ratio, as shown in table 1, subscriber equipment (UE, User Equipment, in literary composition also referred to as terminal) should in the subframe n+k sub-frame of uplink PUCCH of (k > 3) (n represents subframe numbers), feed back to the PDSCH in descending sub frame n (Physical Downlink Shared Channel, Physical Downlink Shared Channel) response message of data (also referred to as confirmation) ACK (Acknowledge, correctly reply)/NACK (Non-Acknowledge, wrong responses), the channel indexes of sub-frame of uplink PUCCH is by sending subframe sequence number and its corresponding PDCCH channel (Physical Downlink Control Channel of downlink data, Physical Downlink Control Channel) minimum CCE (the Control Channel Element in place, control channel unit) the implicit indication of sequence number.Therefore, exist the scene of the ACK/NACK information of a plurality of descending sub frames of feedback on a sub-frame of uplink, under various configurations, the ACK/NACK information concrete condition of the descending sub frame of each sub-frame of uplink feedback is as shown in table 2.
Table 1LTE TDD up-downgoing proportional arrangement
Wherein, D represents descending sub frame, and U represents sub-frame of uplink, and S represents special subframe;
Corresponding descending sub frame number during table 2 sub-frame of uplink feedback acknowledgment information
Tdd systems, due to the scene configuration that exists descending sub frame more than sub-frame of uplink, exists the response message of a plurality of descending sub frames in the situation of same sub-frame of uplink feedback, so tdd systems has the feedback method of two kinds of response messages.These two kinds of methods are respectively binding and multiplexing feedback method.Binding mode is exactly that it (is NACK as long as there is the acknowledge message that the PDSCH of a descending sub frame is corresponding that the ACK/NACK information of a plurality of descending sub frames is carried out with operation according to streams of code words (transmission block) sequence number, result is just NACK, need to retransmit the PDSCH data of all descending sub frames of this user, only having the acknowledge message corresponding to PDSCH of all descending sub frames is all ACK, result is just ACK, the PDSCH that represents all descending sub frames receives correct), then, return to an ACK/NACK information, i.e. the above-mentioned result with operating.The mode of multiplexing feedback refers to that terminal returns to respectively the ACK/NACK information of each subframe to base station.
In tdd systems, in descending scheduling signaling, contain the descending allocation index (DAI, Downlink Assignment Index) of 2 bits, the value V of DAI
dAI uLby table 3, provided, at feedback window, (feedback window corresponding to certain sub-frame of uplink is according to timing relationship, the set that need to form at all descending sub frames of this sub-frame of uplink feeding back uplink control information) in, the DAI value of the PDCCH (Physical DownlinkControl Channel, Physical Downlink Control Channel) of each scheduling increases progressively 1.Also the allocation index that contains 2 bits in uplink scheduling signaling (sending in last subframe of UE in being carried on feedback window), (M is feedback window size to M descending sub frame in expression feedback window, feed back the number of the descending sub frame that window comprises, be 4 to the maximum) in altogether distribute to PDSCH (the Physical Downlink SharedCHannel of terminal, Physical Downlink Shared Channel) number of subframe (referring to comprise the subframe of the PDSCH channel of distributing to terminal) and SPS (Semi-Persistent Scheduling, semi-persistent scheduling) subframe.UE selects a scrambler sequence to carry out at up channel, sending after scrambling to the response message (also referred to as ACK/NACK bit) of feedback according to the value of the descending allocation index indication (DAI) in uplink scheduling signaling.4 DAI values in table 3 correspond respectively to 1 scrambler sequence, and this corresponding relation of terminal and base station side is identical.
The descending allocation index of table 3 (DAI) value
| DAI is high-order, low level | The value of DAI | The number of subframes of |
| 0，0 | 1 | 1or 5or 9 |
| 0，1 | 2 | 2or6 |
| 1，0 | 3 | 3or 7 |
| 1，1 | 4 | 0or 4or 8 |
In tdd systems, except ACK and this response message of two kinds of NACK, if UE does not correctly detect while belonging to control channel PDCCH channel corresponding to its descending sub frame, UE just can feeding back ACK/nack message, this situation is called DTX (Discontinuous Transmission, intermittently transmitting).Herein, response message, except ACK, NACK, also comprises DTX.
Herein, by the response message of PDSCH data in descending sub frame referred to as the response message to descending sub frame
In the scheme of existing LTE TDD, do not provide M=1, and the feedback method to the response message of descending sub frame in feedback window while adopting the multiplexing feedback system of ACK/NACK, do not provide M > 1, the feedback method to the response message of descending sub frame in feedback window when PUCCH channel adopts the multiplexing feedback system of ACK/NACK yet.The response message of descending sub frame in literary composition, comprises the response message to PDSCH channel data in descending sub frame, also can comprise the response message of the downlink data that other need to be replied.The feedback method the imperfection that cause current downlink sub-frame response information.
Summary of the invention
The technical problem to be solved in the present invention is to provide the feedback method of the downlink sub-frame response information in a kind of long evolving system, for to feed back window size M be 1 and adopt the situation of multiplexing feedback system, the accurate data receiver result of feeding back downlink subframe reduce the probability of base station flase drop.
In order to solve the problems of the technologies described above, the invention provides the feedback method of the downlink sub-frame response information in a kind of long evolving system, this long evolving system adopts TDD mode, this feedback method comprises: terminal is 1 o'clock in the feedback window size of a sub-frame of uplink, as received, in the described feedback of indication window, have a descending subframe scheduling to as described in the uplink scheduling signaling of terminal, described terminal, when downlink data being detected and downlink data not detected, adopts respectively different scrambled codes to carry out at up channel, sending after scrambling to the response message of described descending sub frame.
Further, when described terminal detects downlink data on described descending sub frame, according to downlink data reception result, determine that the response message of this descending sub frame is for correctly replying ACK or wrong responses NACK, select a scrambled code to carry out at up channel, sending after scrambling to transmitting the bit of this response message; When described terminal does not detect downlink data on described descending sub frame, the response message of determining this descending sub frame is wrong responses NACK, selects another the different scrambled code of scrambled code adopting when receiving downlink data to carry out at up channel, sending after scrambling to transmitting the bit of this response message.
Further, when described terminal detects downlink data on described descending sub frame, according to V
dAI uL-1 value is selected the scrambler that described downlink sub-frame response information is carried out to scrambling, wherein, and V
dAI uLthe value that represents the descending allocation index DAI in described uplink scheduling signaling.
Further, when described terminal does not detect downlink data on described descending sub frame, according to (V
dAI uL+ 1) value that mod4 obtains is selected the scrambler that described downlink sub-frame response information is carried out to scrambling, wherein, and V
dAI uLthe value that represents the descending allocation index DAI in described uplink scheduling signaling, mod refers to modulo operation.
Further, Physical Downlink Control Channel scheduling on the descending sub frame of described terminal in feedback window, detected or have and distribute to the subframe of the Physical Downlink Shared Channel of described terminal comprising of descending semi-persistent scheduling, but while not receiving corresponding uplink scheduling signaling, terminal, sends at up channel after scrambling for correctly replying ACK or wrong responses NACK according to the response message that the reception result of described Physical Downlink Shared Channel subframe up-downgoing data is determined to this descending sub frame.
Further, described ascending control channel is Physical Uplink Control Channel or Physical Uplink Shared Channel.
By technique scheme, solved M=1, and the feedback problem of the downlink sub-frame response information while adopting multiplexing feedback system, in the data receiver result of accurate feeding back downlink subframe, can reduce the probability of base station flase drop.
The another technical problem that the present invention will solve is to provide the feedback method of the downlink sub-frame response information in a kind of long evolving system, for feeding back window size M, be greater than 1 and at PUCCH channel, adopt the situation of multiplexing feedback system, exactly the data receiver result of feeding back downlink subframe.
In order to solve the problems of the technologies described above, the invention provides the feedback method of the downlink sub-frame response information in a kind of long evolving system, this long evolving system adopts TDD mode, this feedback method comprises: terminal is determined the big or small M of the feedback window that sub-frame of uplink is corresponding, at M, be while being greater than 1 integer, each descending sub frame in described feedback window is all determined to a response message, on row control channel, adopt multiplexing feedback system to send M the corresponding feedback information of response message obtaining physically.
Further, described terminal is according to the response message combination of each descending sub frame in feedback window and the corresponding relation of agreement, the index of Physical Uplink Control Channel is set and for the value of one or more bits of response information transmission, then on this Physical Uplink Control Channel, sends described bit.
Further, described Physical Uplink Control Channel adopts format 1b form.
By technique scheme, solved M > 1, the feedback problem of the downlink sub-frame response information when PUCCH channel adopts the multiplexing feedback system of ACK/NACK.
Accompanying drawing explanation
Fig. 1 is according to the structural representation of basic frame structure in correlation technique LTE system;
Fig. 2 is the schematic diagram of the feedback method of correct and wrong answer while reflecting the feedback states of a plurality of descending sub frames in embodiment in sub-frame of uplink.
Embodiment
The first embodiment
The present embodiment is 1 and with the concrete grammar of multiplexing feedback system feeding back downlink sub-frame response information to feedback window size M.
The present embodiment method comprises the processing to following situation:
Situation one, UE receives uplink scheduling signaling, this uplink scheduling signaling is indicated in the feedback window that sub-frame of uplink is corresponding has a descending subframe scheduling to this UE, and while downlink data being detected on this descending sub frame, UE determines that according to downlink data reception result the response message of this descending sub frame is ACK or NACK, selects a scrambled code to carry out at up channel, sending after scrambling to transmitting the bit of this response message.
Situation two, UE receives uplink scheduling signaling, this uplink scheduling signaling is indicated in the feedback window that sub-frame of uplink is corresponding has a descending subframe scheduling to this UE, but when UE does not detect downlink data on this descending sub frame, UE determines that the response message of this descending sub frame is NACK, and select another scrambled code to carry out at up channel, sending after scrambling to transmitting the bit of this response message, the scrambled code of now the selecting scrambled code that scrambling adopts to response message when receiving downlink data is different.
Above UE adopts different scramblers for the response message under different situations, just can utilize different scrambling codes to represent the response message under different situations, as when response message is NACK, base station just can be judged terminal reception condition according to scrambler and belong to above-mentioned situation one (UE is not correctly decoded PDSCH) or situation two, does not need to increase the bit number for response information transmission.
Concrete while selecting scrambled code, because be to carry out scrambler of corresponding selection according to value 0～3 at present, for above-mentioned situation one, can be by the mode identical with FDD, the scrambled code that selection is corresponding with DAI value in this uplink scheduling signaling, according to V
dAI uL-1 value is selected corresponding scrambler, for above-mentioned situation two, can adopt (V
dAI uL+ 1) mod4 (mod refers to modulo operation) selects corresponding scrambler.Wherein, V
dAI uLthe value that represents DAI in uplink scheduling signaling.
In the present embodiment, by definite account form, the result of calculation of DAI value is selected to two corresponding scramblers, base station, when descrambling, just can only compare with 2 scramblers rather than all 4 scramblers like this, has improved efficiency and accuracy.And above-mentioned concrete account form makes the index of these 2 scrambler sequence be spaced apart 1, can reduce like this probability of flase drop.
On the descending sub frame of UE in feedback window, the PDSCH subframe (referring to has PDSCH to distribute to the subframe of this UE) of PDCCH scheduling or the PDSCH subframe of descending semi-persistent scheduling detected, but while not receiving corresponding uplink scheduling signaling, UE, according to the reception result of PDSCH subframe up-downgoing data is determined to the response message of this PDSCH descending sub frame is ACK or NACK, sends at up channel after scrambling.
Above-mentioned up channel is not limited to PUCCH, can be also Physical Uplink Shared Channel (PUSCH).While using PUCCH, the form of PUCCH is not limited yet, can response information transmission.
The second embodiment
LTE TDD terminal obtains the parameter of downstream feedback window size, according to the response message of feedback window size transmission descending sub frame.The present embodiment is greater than 1 and on PUCCH channel, adopt the concrete grammar of multiplexing feedback system feeding back downlink sub-frame response information to feedback window size M.
Please refer to Fig. 2, the method for the present embodiment comprises:
In the present embodiment, the dispatch in epimere comprises uplink scheduling signaling and/or descending scheduling signaling.The processing of this step is identical with existing method.
To a certain descending sub frame, whether response message can detect PDCCH channel according to terminal, whether correctly receives the situations such as PDSCH channel data, and the response message of determining descending sub frame is ACK, NACK or DTX.Specifically can be with reference to existing standard.
At M, be greater than at 1 o'clock, can be at terminal and the base station side agreement combination of M response message and the corresponding relation of the above-mentioned bit value for response information transmission and PUCCH channel indexes.For example, when PUCCH channel adopts format 1b form, can a combination corresponding to value and the PUCCH channel indexes of 2 bits for response information transmission by the combination of each response message, to save the overhead bit for response information transmission.
The M of take equals 2 as example, when the state of 2 descending sub frames is ACK, the PUCCH channel indexes of response information transmission according to the 2nd descending sub frame sequence number in feedback window and wherein the sequence number of the minimum CCE in PDCCH channel place by agreement formula (can regulation in reference standard), calculate, 2 bits that format 1b is used for response information transmission are that b (0) and b (1) are set to 1; When the state of 2 descending sub frames is ACK and NACK (or ACK and DTX), the PUCCH channel indexes of response information transmission according to the 1st descending sub frame sequence number in feedback window and wherein the sequence number of the minimum CCE in PDCCH channel place by arranging formula, calculate, b (0) and b (1) are respectively and are set to 0 and 1.Etc..
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a feedback method for the downlink sub-frame response information in long evolving system, this long evolving system adopts TDD mode, and this feedback method comprises:
Terminal is 1 o'clock in the feedback window size of a sub-frame of uplink, as received, in the described feedback of indication window, have a descending subframe scheduling to as described in the uplink scheduling signaling of terminal, described terminal, when downlink data being detected and downlink data not detected, adopts respectively different scrambled codes to carry out adopting multiplexing feedback system to send at up channel after scrambling to the response message of described descending sub frame; Wherein,
When described terminal detects downlink data on described descending sub frame, according to downlink data reception result, determine that the response message of this descending sub frame is for correctly replying ACK or wrong responses NACK, select a scrambled code to carry out adopting multiplexing feedback system to send at up channel after scrambling to transmitting the bit of this response message;
When described terminal does not detect downlink data on described descending sub frame, the response message of determining this descending sub frame is wrong responses NACK, selects another the different scrambled code of scrambled code adopting when receiving downlink data to carry out adopting multiplexing feedback system to send at up channel after scrambling to transmitting the bit of this response message.
2. feedback method as claimed in claim 1, is characterized in that,
When described terminal detects downlink data on described descending sub frame, according to
value is selected the scrambler that described downlink sub-frame response information is carried out to scrambling, wherein,
the value that represents the descending allocation index DAI in described uplink scheduling signaling.
3. feedback method as claimed in claim 2, is characterized in that,
When described terminal does not detect downlink data on described descending sub frame, according to
the value obtaining is selected the scrambler that described downlink sub-frame response information is carried out to scrambling, wherein,
the value that represents the descending allocation index DAI in described uplink scheduling signaling, mod refers to modulo operation.
4. the method as described in claim 1 or 3, is characterized in that,
Physical Downlink Control Channel scheduling on the descending sub frame of described terminal in feedback window, detected or have and distribute to the subframe of the Physical Downlink Shared Channel of described terminal comprising of descending semi-persistent scheduling, but while not receiving corresponding uplink scheduling signaling, terminal, sends at up channel after scrambling for correctly replying ACK or wrong responses NACK according to the response message that the reception result of described Physical Downlink Shared Channel subframe up-downgoing data is determined to this descending sub frame.
5. the method as described in claim 1 or 3, is characterized in that,
Described ascending control channel is Physical Uplink Control Channel or Physical Uplink Shared Channel.
6. a feedback method for the downlink sub-frame response information in long evolving system, this long evolving system adopts TDD mode, and this feedback method comprises:
Terminal is determined the big or small M of the feedback window that sub-frame of uplink is corresponding, at M, be while being greater than 1 integer, each descending sub frame in described feedback window is all determined to a response message, on row control channel, adopt multiplexing feedback system to send M the corresponding feedback information of response message obtaining physically; Wherein,
Described terminal is according to the response message combination of each descending sub frame in feedback window and the corresponding relation of agreement, the index of Physical Uplink Control Channel is set and for the value of one or more bits of response information transmission, then on this Physical Uplink Control Channel, sends described bit.
7. method as claimed in claim 6, is characterized in that,
Described Physical Uplink Control Channel adopts format1b form.
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