CN102064921A - Sending method of response information and user terminal - Google Patents
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Abstract
The invention discloses a sending method of response information and a user terminal, used for solving the problem that ACK/NACK (Acknowledgement/ Negative Acknowledgement) response information can not be sent on a PUSCH (Physical Uplink Shared Channel) under a carrier aggregation scene. Under the carrier aggregation scene, UE firstly obtains a bit sequence of the ACK/NACK response information to be sent, then calculates the number of coding modulation symbols required by the bit sequence of the ACK/NACK response information sent on the PUSCH, and finally sends the ACK/NACK response information on the PUSCH. The invention effectively solves the problem that the ACK/NACK response information is sent on the PUSCH under the carrier aggregation scene.
Description
Technical Field
The present invention relates to the field of mobile wireless communications, and in particular, to a method and a User Equipment (UE) for sending response information in a wireless communication system.
Background
A Radio Frame (Radio Frame) in a Long Term Evolution (LTE) system includes Frame structures of a Frequency Division Duplex (FDD) mode and a Time Division Duplex (TDD) mode. As shown in FIG. 1, in the frame structure of FDD mode, a 10 millisecond (ms) radio frame consists of twenty slots (slots) with the length of 0.5ms and the number of 0 ~ 19, and slots 2i and 2i +1 constitute a subframe (subframe) i with the length of 1ms (wherein 0 ≦ i ≦ 9). As shown in FIG. 2, in the frame structure of TDD mode, a 10ms radio frame is composed of two half-frames (half frames) of 5ms, one half-frame includes 5 subframes of 1ms, and subframe i is defined as a combination of 2 slots 2i and 2i +1 of 0.5ms (where 0 ≦ i ≦ 9).
In the above two frame structures, when a Normal Cyclic Prefix (Normal CP) is used, 7 symbols are included in one slot, and when an Extended Cyclic Prefix (Extended CP) is used, 6 symbols are included in one slot.
The uplink and downlink configurations supported by each subframe are shown in table 1. Here, "D" denotes a subframe dedicated to Downlink transmission, "U" denotes a subframe dedicated to Uplink transmission, and "S" denotes a special subframe used for three fields of DwPTS (Downlink pilot time Slot), Guard Period (GP), and UpPTS (Uplink pilot time Slot).
TABLE 1 schematic table of uplink and downlink configuration supported by each subframe
As can be seen from the above table, the LTE TDD supports uplink and downlink switching periods of 5ms and 10 ms. If the period of the downlink-to-uplink switching point is 5ms, the special subframe exists in two half frames; if the period of the downlink-to-uplink switching point is 10ms, the special subframe only exists in the first half frame; subframe # 0 and subframe #5 and DwPTS are always used for downlink transmission; the UpPTS and the subframe immediately following the special subframe are dedicated for uplink transmission.
In a frequency division duplex FDD system, because Uplink and Downlink subframes are in one-to-one correspondence, when a Physical Downlink Shared Channel (PDSCH) only contains one codeword stream, a user terminal needs to feed back 1-bit ACK/NACK response information, when the PDSCH contains two codeword streams, a UE needs to feed back 2-bit ACK/NACK response information, and when the UE does not have a PUSCH (Physical Uplink Shared Channel) in a current subframe and needs to transmit, the UE uses a format 1a/1b to transmit the 1-bit or 2-bit ACK/NACK response information on a PUCCH (Physical Uplink Control Channel); and when the UE has PUSCH transmission in the current subframe, the UE multiplexes the 1-bit or 2-bit information with data after certain mapping from an ACK/NACK state to a corresponding bit, channel coding, scrambling and modulating, and then transmits the information on the PUSCH.
In the TDD system, because uplink and downlink subframes are not in one-to-one correspondence, that is, ACK/NACK response information corresponding to a plurality of downlink subframes needs to be sent on a PUCCH/PUSCH channel of one uplink subframe, a downlink subframe set corresponding to the uplink subframe constitutes a bundling windoW (bundling windoW). In LTE TDD, two types of ACK/NACK acknowledgement information transmission are defined: one is an ACK/NACK bundling (ACK/NACK bundling) method, and the other is an ACK/NACK multiplexing (multiplexing) method: and the high-level configuration UE feeds back the ACK/NACK by adopting a bundling or multiplexing method. The basic idea of the bundling method is that logic and operation (time domain bundling) is carried out on ACK/NACK messages of code stream corresponding to each downlink subframe which needs to be fed back by the uplink subframe to obtain 1-bit or 2-bit ACK/NACK response information, and when the UE does not have PUSCH to be sent in the current subframe, the UE sends the 1-bit or 2-bit ACK/NACK response information on the PUCCH by adopting a format 1a/1 b; when the UE has PUSCH transmission in the current subframe, the UE transmits the 1 bit or 2 bit information on the PUSCH after certain channel coding and channel interleaving. The core idea of the multiplexing method is to use different PUCCH channels and different modulation symbols on the PUCCH channels to represent different feedback states of a downlink subframe that needs to be fed back on the uplink subframe, and if there are multiple transport blocks on the downlink subframe, perform logical conjunction (spatial multiplexing) on ACK/NACK fed back by the multiple transport blocks of the downlink subframe, then perform channel selection, and then send the ACK/NACK using PUCCH format1 b. When the UE does not have a PUSCH to be sent in the current subframe, the UE sends the plurality of ACK/NACK response messages on the PUCCH by adopting a format1b joint channel selection (format 1b with channel selection); when the UE has PUSCH transmission in the current subframe, the UE carries out mapping from a plurality of bit information to corresponding bits through a certain ACK/NACK state, multiplexes the bit information and data after channel coding and channel interleaving, and then transmits the bit information on the PUSCH.
Wherein, the coding process when the response information is transmitted on the PUSCH comprises the following steps:
First, the number Q 'of desired code symbols is calculated from the above (equation 1)'ACK(ii) a Wherein, O represents the bit number of the uplink control information to be sent;
representing the bandwidth of the current subframe for PUSCH transmission, and representing the bandwidth by the number of carriers;
indicating the number of symbols used in initial PUSCH transmission, excluding Demodulation Reference Signal (DMRS) and Sounding Reference Signal (SRS);
the bandwidth during initial PUSCH transmission is represented by the number of subcarriers; c represents the number of code blocks corresponding to the transmission block after CRC and code block segmentation; krRepresenting the number of bits corresponding to each code block of the transport block; c, K for the same transport blockrAnd
obtaining from an initial PDCCH; when there is no PDCCH of the initial DCI format 0,
c and KrCan be obtained in two ways: (1) when the initial PUSCH adopts semi-persistent scheduling, the PUSCH can be acquired from the PDCCH configured by the latest semi-persistent scheduling; (2) when the PUSCH is triggered by the random access response authorization, acquiring the random access response authorization corresponding to the same transmission block;
to represent
Or
This value is configured by higher layers; then, channel coding is carried out, and the bits after ACK/NACK response information coding are repeated until the target length Q is metACK＝Q′ACK*QmThe coded information bits are respectively marked as
Generating corresponding code modulation sequence according to modulation order
Will be provided with
And the coded data and/or other coded uplink control information are transmitted after channel interleaving.
In order to meet the requirements of the International telecommunications union-Advanced (ITU-Advanced), the Long Term Evolution-Advanced (LTE-a) system as an LTE Evolution standard needs to support a larger system bandwidth (up to 100MHz) and needs to be backward compatible with the existing standard of LTE. On the basis of the existing LTE system, a larger bandwidth can be obtained by combining bandwidths of the LTE system, and this technology is called Carrier Aggregation (CA) technology. The technology can improve the spectrum utilization rate of the IMT-Advance system, relieve the shortage of spectrum resources and further optimize the utilization of the spectrum resources. The LTE system bandwidth of Carrier aggregation may be regarded as Component Carrier frequencies (spectrum), each of which may also be referred to as a Cell (Cell), that is, a spectrum may be aggregated by n Component Carrier frequencies (cells). One resource of R10UE is composed of n cells (component carrier frequencies) in the frequency domain, where one cell is called a Primary cell (Primary cell) and the rest of the cells are called Secondary cells (Secondary cells).
In a carrier aggregation scenario, a plurality of downlink subframes correspond to one uplink subframe, each downlink subframe has a plurality of cells, and each cell may be transmitted by one transmission block or two transmission blocks according to different transmission modes, which is specified in the prior art: in the LTE-a time division duplex system, when ACK/NACK response information is transmitted on the PUCCH, two transmission methods are defined: by adopting a PUCCH format1b with channel selection and a DFT-s-OFDM mode (PUCCH format3), when ACK/NACK response information is sent by adopting format1b with channel selection, for ACK/NACK response information with less than or equal to 4 bits, bundling is not adopted, for ACK/NACK response information with more than 4 bits, spatial bundling and time-domain bundling can be adopted, when ACK/NACK response information is sent by adopting format3, the maximum load of the sent ACK/NACK response information is 20 bits, but the prior art does not provide a method for determining the mapping relation and the load size of the ACK/NACK response information during PUSCH transmission, so that the transmission of the ACK/NACK response information on the PUSCH cannot be realized.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method for transmitting ACK/NACK response information on a physical uplink shared channel and a corresponding user terminal, so as to solve the problem that the ACK/NACK response information cannot be transmitted on a PUSCH in a carrier aggregation scenario.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
fig. 3 is a flowchart of a method for sending response information according to the present invention, where the response information refers to correct or incorrect (ACK/NACK) response information fed back to a base station by a UE, and the main steps are as follows:
step 302: under the scene of carrier aggregation, the UE acquires an ACK/NACK response information bit sequence required to be sent according to relevant information;
step 304: the UE calculates the number of coding modulation symbols required by the bit sequence for sending the ACK/NACK response information on the PUSCH;
step 306: the UE sends ACK/NACK response information on a PUSCH;
wherein, in step 302, the UE acquiring the ACK/NACK response information bit sequence to be sent according to the relevant information means: the UE determines the ACK/NACK response information to be sent according to the number of downlink component carriers (or cells) configured by a base station, the configured proportional relation of uplink and downlink subframes, the configured transmission mode of each downlink component carrier and the number of ACK/NACK response information bits which can be sent at most on a PUSCH, and maps the ACK/NACK response information to be sent to a bit sequence;
or in step 302, the UE acquires the bit sequence of the ACK/NACK response information to be sent according to the feedback mode configured by the higher layer:
if the high-level configuration adopts a mode of combining format1b and channel selection to send ACK/NACK response information, determining an ACK/NACK response information bit sequence to be sent according to the ACK/NACK information in a mapping table of the channel selection mode;
if the high-level configuration adopts a format3 mode to send the ACK/NACK response information, determining the ACK/NACK response information to be sent according to the number of downlink component carriers configured by the UE, the transmission mode configured by each downlink component carrier, the proportional relation of uplink and downlink subframes and the number of ACK/NACK response information bits which can be sent at most on the PUSCH, and mapping the ACK/NACK response information to be sent into a bit sequence.
Further, if the PUSCH can transmit 40-bit ACK/NACK response information at most, mapping the corresponding ACK/NACK response information to a bit sequence according to an order of a codeword stream first and then a component carrier (or cell) and then a subframe, or an order of a codeword stream first and then a subframe and then a component carrier (or cell);
further, if at most M bits of ACK/NACK response information can be transmitted on the PUSCH, and the ACK/NACK response information currently required to be transmitted exceeds M bits, the ACK/NACK bit sequence can be obtained by one of the following ways:
the first method is as follows: when the ACK/NACK response information is mapped to a bit sequence, after logic and operation is carried out on the ACK/NACK response information corresponding to the PDSCH containing 2 code stream, the ACK/NACK response information after the logic and operation is mapped to the corresponding bit sequence;
the second method comprises the following steps: performing logic and operation on 2 ACK/NACK response information corresponding to the PDSCH according to a predefined method until the total bit number of the ACK/NACK response information needing to be sent does not exceed M bits, and then mapping the ACK/NACK response information after the logic and operation into a corresponding bit sequence, wherein the predefined method is one of the following methods:
(1) performing logic and operation on ACK/NACK response information corresponding to PDSCHs containing 2 code stream in all secondary component carriers (or cells);
to explain further, if the total bit number of the ACK/NACK response information after performing the logical and operation on the ACK/NACK response information corresponding to the PDSCH including 2 codeword streams in all the secondary component carriers (or cells) still exceeds M bits, then performing the logical and operation on the ACK/NACK response information corresponding to the PDSCH including 2 codeword streams in the primary component carrier;
(2) performing logic AND operation on ACK/NACK response information corresponding to all PDSCHs containing 2 code word streams in a component carrier (or a cell) according to the sequence of the priority of the component carrier (or the cell) from low to high until the total bit number of the ACK/NACK response information does not exceed M;
(3) performing logic and operation on ACK/NACK response information corresponding to PDSCHs (physical downlink shared channels) containing 2 code word streams in all component carriers (or cells) corresponding to the sub-frames according to the sequence of the sub-frames until the total bit number of the ACK/NACK response information does not exceed M;
(4) sequencing all PDSCHs according to the sequence of a first sub-frame and a second sub-frame or the sequence of the first sub-frame and the second sub-frame, and carrying out logic AND operation on ACK/NACK response information corresponding to the PDSCHs containing 2 code word streams one by one according to the sequence from back to front or from front to back until the total bit number of the ACK/NACK response information does not exceed M;
further, M is a fixed value agreed by the base station and the UE, and M is ∈ {20, 21, 22, 23, 24, 25, 26}
When mapping the ACK/NACK response information into a bit sequence, the mapping method is one of the following methods:
the method comprises the following steps: mapping according to a predefined component carrier sequence, mapping ACK/NACK response information of the same component carrier according to a subframe sequence or mapping according to a value of a Downlink Allocation Index (DAI) in downlink authorization information (DLassignment), wherein the ACK/NACK response information released by semi-static continuous scheduling is positioned at the forefront or the rearmost of the ACK/NACK response information fed back by the component carrier where the ACK/NACK response information is positioned;
the predefined component carrier sequence is configured in a high layer, or the predefined component carrier sequence is a component carrier index sequence, or a primary component carrier and a secondary component carrier are firstly carried out;
the quantity of the ACK/NACK response information fed back by each component carrier is determined by the quantity of the configured downlink subframes and the transmission mode, or by the quantity of the configured downlink subframes and the transmission mode, and the value of the downlink allocation index in the uplink authorization information (ULgrant);
the second method comprises the following steps: mapping according to the sequence of the sub-frames, and mapping the ACK/NACK response information on the same sub-frame according to the sequence of the predefined component carriers;
the predefined component carrier sequence is configured in a high layer, or the predefined component carrier sequence is a component carrier index sequence, or a primary component carrier and a secondary component carrier are firstly carried out.
Further, when the UE does not detect the PDSCH on the configured corresponding downlink component carrier (or cell), its corresponding acknowledgement information is set to NACK;
further, when the base station configures that one of two codeword streams (transport blocks) corresponding to the PDSCH is not enabled and sends ACK/NACK response information corresponding to the PDSCH without performing a logical and operation, then the response information of the codeword stream corresponding to the transport block that is not enabled is set to NACK;
further, when the base station configures that a certain codeword stream of two codeword streams (transport blocks) corresponding to the PDSCH is not enabled and sends ACK/NACK response information corresponding to the PDSCH for logical and operation, then the ACK/NACK response information corresponding to the non-enabled codeword stream (transport block) is set as ACK, or the logical and operation result of the ACK/NACK response information corresponding to the PDSCH is ACK/NACK response information corresponding to the enabled codeword stream (transport block);
further, the method for acquiring the bit sequence of the ACK/NACK response information to be sent may also be adapted to send the ACK/NACK response information on the PUCCH in format 3;
to explain further, in the present invention, the correct acknowledgement information (ACK) corresponds to binary "1", and the incorrect acknowledgement information (NACK) corresponds to binary "0".
In step 304, if the ACK/NACK response information is transmitted on the PUSCH without being encoded in a Dual Reed-Muller (Dual RM) manner, when calculating the number of coded modulation symbols required for transmitting the bit sequence of the ACK/NACK response information on the PUSCH, the bit number O of the uplink control information to be transmitted is obtained by one of the following manners:
(1) when the UE transmits the PUSCH according to the uplink grant UL grant information,
or
Or
Or
When the UE does not transmit the PUSCH according to the uplink authorization information UL grant information, O is equal to the length of the bit sequence of the obtained ACK/NACK response information; wherein,
the uplink grant information refers to a downlink allocation index in an uplink grant information (UL grant) and indicates the maximum value of the total number of PDSCHs sent to the UE by the base station or the number of downlink subframes for scheduling feedback ACK/NACK response messages in all component carriers; as long as there is one PDSCH for 2 transport blocks, TBmax2; otherwise, TBmax＝1；TBmax(c) C-1 represents the maximum value of the transport block in the component carrier C, and C is the number of the component carriers configured by the UE; o ismaxRepresents the maximum number of bits for the UE to feed back the ACK/NACK response message,k represents the number of downlink subframes in the configured proportional relation of the uplink subframes and the downlink subframes, TBxRepresents the maximum bit number of the correct and incorrect response message corresponding to the PDSCH on each downlink component carrier configured to the UE, or OmaxThe maximum bit number of the ACK/NACK response message fed back through logic and operation is represented;
(2) o is equal to the resulting bit sequence length;
(3) o is equal to the quantity of ACK/NACK response information corresponding to TB received by the UE and ACK/NACK response information released by semi-static continuous scheduling;
further, if the ACK/NACK response information is encoded in a Dual RM manner when transmitted on the PUSCH, and the number of coded modulation symbols required for calculation is jointly calculated, the number O of bits of the uplink control information to be transmitted during calculation is obtained in one of the following manners:
(1) when the UE transmits the PUSCH according to the uplink grant UL grant information,
when the UE does not transmit the PUSCH according to the UL grant information, O is equal to the length of the bit sequence of the obtained ACK/NACK response information;
the maximum value of the total number of PDSCHs corresponding to the ACK/NACK response information allocated to the two RMs is shown;
(2) when the UE transmits the PUSCH according to the uplink grant UL grant information,
or
Or
OrWhen the UE does not transmit the PUSCH according to the uplink authorization information UL grant information, O is equal to the length of the bit sequence of the obtained ACK/NACK response information; wherein,
the maximum value is the total number of PDSCHs sent to the UE by the base station or the maximum value in the number of downlink subframes for scheduling feedback ACK/NACK response messages in all component carriers; as long as there is one PDSCH for 2 transport blocks, TB max2; otherwise, TBmax＝1；TBmax(c) C-1 represents the maximum value of the transport block in the component carrier C, and C is the number of the component carriers configured by the UE; o ismaxRepresents the maximum number of bits for the UE to feed back the ACK/NACK response message,
k represents the number of downlink subframes in the configured proportional relation of the uplink subframes and the downlink subframes, TBxRepresents the maximum bit number of the correct and incorrect response message corresponding to the PDSCH on each downlink component carrier configured to the UE, or OmaxIndicating the ACK/NThe maximum bit number of the ACK response message after logic and operation feedback;
(3) o is equal to the length of the bit sequence of the obtained ACK/NACK response information;
(4) and O is equal to the quantity of ACK/NACK response information corresponding to the TB received by the UE and the ACK/NACK response information released by the semi-static persistent scheduling.
Further, if the ACK/NACK response information is coded in the Dual RM manner when transmitted on the PUSCH, and the number of coded modulation symbols required for calculation is calculated independently, the number O of bits of the uplink control information to be transmitted is calculated1，O2Obtained by one of the following ways:
(1) when the UE transmits the PUSCH according to the uplink grant UL grant information,
when the UE does not transmit the PUSCH according to the uplink grant UL grant information, wherein, O1，O2When the calculation is independent, the bit number of the uplink control information to be sent,
the maximum value of the total number of PDSCHs corresponding to the ACK/NACK response information allocated to the two RMs is shown, and the length of the bit sequence of the obtained ACK/NACK response information is shown by N;
(2)
n represents the length of the bit sequence of the obtained ACK/NACK response information；
(3)
When the UE transmits the PUSCH according to the uplink grant UL grant information,
or
When the UE does not transmit the PUSCH according to the uplink grant UL grant information, N indicates the length of the bit sequence of the obtained ACK/NACK response information,
representing the maximum value in the number of downlink subframes for scheduling and feeding back ACK/NACK response messages in all the component carriers; as long as there is one PDSCH for 2 transport blocks, TB max2; otherwise, TBmax＝1；TBmax(c) C-1 represents the maximum value of the transport block in the component carrier C, and C is the number of configured component carriers;
k represents the number of downlink subframes in the configured proportional relation of the uplink subframes and the downlink subframes, TBxRepresents the maximum bit number of the correct and incorrect response message corresponding to the PDSCH on each downlink component carrier configured to the UE, or OmaxThe maximum bit number of the ACK/NACK response message fed back through logic and operation is represented;
(4)O1the quantity of ACK/NACK response information corresponding to the TB received by the UE mapped in one Reed-Muller code is represented; o is2Indicating the number of TBs received by the UE corresponding to ACK/NACK response information mapped in another reed-muller code.
Further, the
And determining according to the DAI in the uplink authorization information, wherein when a plurality of uplink authorization information are sent to the UE, the DAI in the uplink authorization information has the same value.
Further, in step 306, the sending of the ACK/NACK response information by the UE on the PUSCH includes: and the UE encodes the generated ACK/NACK bit sequence according to a corresponding encoding mode, obtains an encoded sequence according to the number of the encoded modulation symbols, multiplexes the encoded sequence and data together after channel interleaving, and then transmits the encoded sequence on a PUSCH.
The invention provides a user terminal, comprising: the device comprises an acquisition module, a calculation module and a sending module, wherein the acquisition module is used for acquiring a bit sequence of ACK/NACK response information to be sent; the calculation module is used for calculating the number of coding modulation symbols required by the bit sequence for sending the ACK/NACK response information on the PUSCH; the sending module is used for sending the ACK/NACK response information on a PUSCH. The above modules are all configured to implement the method for sending ACK/NACK response information provided by the present invention, and the specific technical solutions of the methods can be embodied in the functions of the modules and the interaction relationships among the modules, which are not described herein again.
Note: when step 304 is not related to step 302, the order of the two may be interchanged;
according to the transmission method of the ACK/NACK response information on the physical uplink shared channel, the problem that the ACK/NACK response information is sent on the PUSCH under the carrier aggregation scene is effectively solved.
Drawings
Fig. 1 is a diagram illustrating a frame structure in a FDD system in the prior art;
FIG. 2 is a diagram illustrating a frame structure in a prior art TDD system;
FIG. 3 is a flow chart illustrating a method for sending response messages according to the present invention;
FIG. 4 is a schematic diagram of a first embodiment of the present invention;
fig. 5 is a diagram illustrating determination of an ACK/NACK bit sequence according to a first embodiment of the present invention;
fig. 6 is a diagram illustrating determination of an ACK/NACK bit sequence according to a second embodiment of the present invention;
fig. 7 is a diagram illustrating determination of an ACK/NACK bit sequence according to a third embodiment of the present invention;
fig. 8 is a diagram illustrating determination of an ACK/NACK bit sequence according to a second embodiment of the present invention;
fig. 9 is a diagram illustrating determination of an ACK/NACK bit sequence according to a second mode five of the embodiments of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings by way of examples.
The first embodiment is as follows:
as shown in fig. 4, in the TDD system, it is assumed that a base station configures 4 downlink component carriers (or cells) { DL CC # 0, DL CC # 1, DL CC # 2, and DL CC #3} for a UE, and all need to feed back 2-bit ACK/NACK response information, and it is assumed that an uplink subframe needs to simultaneously feed back ACK/NACK response information of 3 downlink subframes in total, namely, downlink subframes # n, # n +1, and # n + 2; at most, the ACK/NACK response information which can be sent on the PUSCH is 40 bits; when the ACK/NACK response information is transmitted on the PUSCH, the coding is not carried out by adopting a Dual RM code, and when the PUSCH is transmitted, the coding is carried out according to a UL grant and only one transmission block is correspondingly arranged.
Step 402: and the UE determines the bit sequence of the ACK/NACK response information to be fed back according to the number of downlink component carriers (or cells) configured for the terminal by the base station, the configured uplink and downlink proportional relation and the configured transmission mode of each downlink component carrier. The terminal maps the corresponding obtained ACK/NACK response information to a bit sequence according to the sequence of the code word stream, the subframe and the component carrier (or cell), wherein the length of the bit sequence is 24;
step 404: the UE calculates the number of coding symbols required when the ACK/NACK response information bit sequence is sent according to the relevant information, and when the number of the coding symbols is calculated, the O value is determined according to one of the following modes:
(1) since the PUSCH for transmission is performed according to the UL grant, when the number of coded modulation symbols is calculated,
or
Or
Or
The UE calculates the number of the required code modulation symbols according to the length of the obtained bit sequence;
(2) o ═ bit sequence length;
(3) o is the number of the received transmission blocks;
wherein,
the maximum value of the total number of PDSCHs sent to the UE by the base station or the number of downlink subframes in all component carriers (or cells) is shown, when any PDSCH corresponds to 2 transmission blocks, TB max2; otherwise, TBmax＝1；TBmax(c) C-1 denotes the maximum value of transport blocks in a component carrier (or cell) C, i.e. if any PDSCH in that component carrier (or cell) C corresponds to 2 transport blocks, TBmax(C) Else TB is 2max(C) 1, M represents configured aboveThe number of downlink sub-frames in the proportional relation of the downlink sub-frames, N represents the number of downlink component carriers, TBxRepresenting the bit number of ACK/NACK response information required to be sent by each downlink component carrier (or cell) configured to the UE;
step 406: and the UE encodes the generated bit sequence of the ACK/NACK response information according to a corresponding encoding mode, obtains an encoded sequence according to the number of the encoded modulation symbols, multiplexes the encoded sequence and data together after channel interleaving, and then transmits the encoded sequence on a PUSCH.
Example two:
as shown in fig. 5 to 9, in the TDD system, it is assumed that a base station configures 4 downlink component carriers (or cells) { DL CC # 0, DL CC # 1, DL CC # 2, and DL CC #3} to a UE, where DL CC # 0/1/3 all needs to feed back 2-bit ACK/NACK response information, DL CC # 2 needs to feed back 1-bit ACK/NACK response information, and it is assumed that an uplink subframe needs to simultaneously feed back ACK/NACK response information of 3 downlink subframes in total, namely, downlink subframes # n, # n +1, and # n + 2; at most, the ACK/NACK response information which can be sent on the PUSCH is M bits, and the base station and the UE agree that M is 20; and coding the ACK/NACK response information by adopting a Dual RM code when the ACK/NACK response information is transmitted on the PUSCH, wherein the transmission of the PUSCH is carried out according to the ULgrant and only one corresponding transmission block is available.
Step 602: the UE determines a bit sequence of ACK/NACK response information to be fed back according to the number of downlink component carriers (or cells) configured for the terminal by the base station, the configured uplink-downlink proportional relation and the configured transmission mode of each downlink component carrier, wherein the ACK/NACK response information which can be sent at most on the PUSCH has 20 bits; obtaining an ACK/NACK bit sequence according to the following mode;
the first method is as follows: as shown in fig. 5, after performing logical and operation on the ACK/NACK response information corresponding to all PDSCHs containing 2 codeword streams, mapping the obtained ACK/NACK response information into corresponding bit sequences according to the order of sub-frame first and component carrier (or cell) second;
the second method comprises the following steps: as shown in fig. 6, wherein DL CC # 0 is a primary component carrier (or primary cell), DLCC # 1/2/3 is a secondary component carrier (or secondary cell), and after performing logical and operation on ACK/NACK response information corresponding to a PDSCH including 2 codeword streams in the secondary component carrier, mapping the obtained ACK/NACK response information into corresponding bit sequences according to the order of the component carrier (or cell) after the sub-frame;
the third method comprises the following steps: as shown in fig. 7, assuming that the priority of DL CC # 0 is the highest, and the priority of DL CC # 3 is the lowest, because only the logical and operation of the ACK/NACK response information corresponding to all PDSCHs containing 2 codeword streams in DL CC3 with the lowest priority is needed to make the information bit not exceed M, the logical and operation of the ACK/NACK response information corresponding to PDSCHs containing 2 codeword streams in DL CC # 3 is performed, and the obtained ACK/NACK response information is mapped into the corresponding bit sequence according to the order of the component carrier (or cell) after the subframe;
the method is as follows: as shown in fig. 8, only the ACK/NACK response information corresponding to the PDSCH including 2 codeword streams in all component carriers (or cells) corresponding to the subframe # n needs to be logically and-operated so that the information bit does not exceed 20, all the ACK/NACK response information corresponding to the PDSCH including 2 codeword streams in the subframe # n are logically and-operated, and the obtained ACK/NACK response information is mapped into the corresponding bit sequence according to the order of the component carriers (or cells) after the subframe;
the fifth mode is as follows: as shown in fig. 9, since only the ACK/NACK response information corresponding to one PDSCH needs to be logically and-operated so that the information bit does not exceed 20, all PDSCHs are ordered according to the sequence from the first sub-frame to the second component carrier (or cell), the ACK/NACK response information corresponding to the PDSCHs on the DL CC # 3 and the sub-frame # n +2 are logically and-operated according to the sequence from the last to the first, and the obtained ACK/NACK response information is mapped into the corresponding bit sequence according to the sequence from the first sub-frame to the second component carrier (or cell);
step 604: the UE calculates the number of coding symbols required when the ACK/NACK response information bit sequence is sent according to the related information, and when the number of the coding symbols is calculated:
if the number of code modulation symbols required for calculation is jointly calculated when the ACK/NACK response information is transmitted on the PUSCH, the O value may be determined according to one of the following manners:
(1) when the UE transmits the PUSCH according to the uplink grant UL grant information,
when the UE does not transmit the PUSCH according to the UL grant information, O is equal to the length of the bit sequence of the obtained ACK/NACK response information;
the maximum value of the total number of PDSCHs corresponding to the ACK/NACK response information allocated to the two RMs is shown;
(2) o is equal to the length of the bit sequence of the obtained ACK/NACK response information;
(3) o is equal to the quantity of ACK/NACK response information corresponding to TB received by the UE and ACK/NACK response information released by semi-static continuous scheduling;
(4) when the UE transmits the PUSCH according to the uplink grant UL grant information,or
Or
Or
When the UE does not transmit the PUSCH according to the uplink authorization information UL grant information, O is equal to the length of the bit sequence of the obtained ACK/NACK response information; wherein,indicating the total number of PDSCHs or all component carriers sent by the base station to the UEThe maximum value in the number of downlink subframes for scheduling and feeding back ACK/NACK response messages in the wave; as long as there is one PDSCH for 2 transport blocks, TBmax2; otherwise, TBmax＝1；TBmax(c) C-1 represents the maximum value of the transport block in the component carrier C, and C is the number of the component carriers configured by the UE; o ismaxRepresents the maximum number of bits for the UE to feed back the ACK/NACK response message,
k represents the number of downlink subframes in the configured proportional relation of the uplink subframes and the downlink subframes, TBxRepresents the maximum bit number of the correct and incorrect response message corresponding to the PDSCH on each downlink component carrier configured to the UE, or OmaxThe maximum bit number of the ACK/NACK response message fed back through logic and operation is represented; if the number of code modulation symbols required for calculation is calculated independently when the ACK/NACK response information is transmitted on the PUSCH, the O value may be determined according to one of the following manners:
(1) when the UE transmits the PUSCH according to the uplink grant UL grant information,
when the UE does not transmit the PUSCH according to the uplink grant UL grant information,
wherein, O1，O2When the calculation is independent, the bit number of the uplink control information to be sent,
the maximum value of the total number of PDSCHs corresponding to the ACK/NACK response information allocated to the two RMs is shown, and the length of the bit sequence of the obtained ACK/NACK response information is shown by N;
(2) 
n represents the length of the bit sequence of the obtained ACK/NACK response information;
(3)
when the UE transmits the PUSCH according to the uplink grant UL grant information,
or
When the UE does not transmit the PUSCH according to the uplink grant UL grant information, N indicates the length of the bit sequence of the obtained ACK/NACK response information,representing the maximum value in the number of downlink subframes for scheduling and feeding back ACK/NACK response messages in all the component carriers; as long as there is one PDSCH for 2 transport blocks, TB max2; otherwise, TBmax＝1；TBmax(c) C-1 denotes the maximum value of transport blocks in component carrier C, C being the number of component carriers,k represents the number of downlink subframes in the configured proportional relation of the uplink subframes and the downlink subframes, TBxRepresents the maximum bit number of the correct and incorrect response message corresponding to the PDSCH on each downlink component carrier configured to the UE, or OmaxThe maximum bit number of the ACK/NACK response message fed back through logic and operation is represented;
(4)O1indicating that the ACK/NACK response information corresponding to the TB received by the UE is mapped on one Reed-MullerThe number in the code; o is2Indicating the number of TBs received by the UE corresponding to ACK/NACK response information mapped in another reed-muller code.
Step 606: and the UE encodes the generated ACK/NACK bit sequence according to a corresponding encoding mode, obtains an encoded sequence according to the number of the encoded modulation symbols, multiplexes the encoded sequence and data together after channel interleaving, and then transmits the encoded sequence on a PUSCH.
In order to implement the above method embodiment, another embodiment of the present invention further provides a user terminal. Since the following embodiments are embodiments for implementing the foregoing method, the modules in the ue are all configured for implementing the foregoing method, and the modules in the ue can be derived from the foregoing method without any doubt. And in the following description, the same contents as those of the aforementioned method are omitted here for economy of space.
The invention provides a user terminal, comprising: the device comprises an acquisition module, a calculation module and a sending module, wherein the acquisition module is used for acquiring a bit sequence of ACK/NACK response information to be sent; the calculation module is used for calculating the number of coding modulation symbols required by the bit sequence for sending the ACK/NACK response information on the PUSCH; the sending module is used for sending the ACK/NACK response information on a PUSCH. The above modules are all configured to implement the method for sending ACK/NACK response information provided by the present invention, and the specific technical solutions of the methods can be embodied in the functions of the modules and the interaction relationships among the modules, which are not described herein again.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (16)
1. A method for transmitting response information, the method comprising:
under a carrier aggregation scene, a User Equipment (UE) acquires a bit sequence of ACK/NACK response information needing to be sent;
the UE calculates the number of coding modulation symbols required by the bit sequence for sending the ACK/NACK response information on the PUSCH;
and the UE sends the ACK/NACK response information on a PUSCH.
2. The method of claim 1, wherein the method for the UE to obtain the bit sequence of the ACK/NACK response information to be sent comprises:
the UE determines the ACK/NACK response information to be sent according to the number of downlink component carriers configured by the base station, the configured proportional relation of uplink and downlink subframes, the configured transmission mode of each downlink component carrier and the number of correct or wrong (ACK/NACK) response information bits which can be sent at most on a Physical Uplink Shared Channel (PUSCH), and maps the ACK/NACK response information to be sent to a bit sequence.
3. The method of claim 1, wherein the method for the UE to obtain the bit sequence of the ACK/NACK response information to be sent comprises:
the UE acquires a bit sequence of ACK/NACK response information to be sent according to a feedback mode configured by a high layer:
if the high-level configuration adopts a mode of combining format1b and channel selection to send ACK/NACK response information, determining a bit sequence of the ACK/NACK response information to be sent according to the ACK/NACK information in a mapping table of the channel selection mode;
if the high-level configuration adopts a format3 mode to send the ACK/NACK response information, determining the ACK/NACK response information to be sent according to the number of downlink component carriers configured by the UE, the transmission mode configured by each downlink component carrier, the proportional relation of uplink and downlink subframes and the number of ACK/NACK response information bits which can be sent at most on the PUSCH, and mapping the ACK/NACK response information to be sent into a bit sequence.
4. A method according to claim 2 or 3, characterized in that the method further comprises:
when a bit sequence of ACK/NACK response information needing to be sent is acquired, if the ACK/NACK response information with 40 bits can be sent at most on a PUSCH, the ACK/NACK response information needing to be sent is mapped into the bit sequence according to the sequence of a code word stream, a component carrier and a subframe or the sequence of the code word stream, the subframe and the component carrier.
5. A method according to claim 2 or 3, characterized in that the method further comprises:
when a bit sequence of ACK/NACK response information needing to be sent is acquired, if at most M-bit ACK/NACK response information appointed by a base station and UE can be sent on a PUSCH, and the total bit number of the ACK/NACK response information needing to be sent currently exceeds M bits, performing logic AND operation on the ACK/NACK response information corresponding to all Physical Downlink Shared Channels (PDSCHs) containing 2 code word streams, and mapping the ACK/NACK response information after the logic AND operation to the corresponding bit sequence, wherein the value of M is {20, 21, 22, 23, 24, 25, 26 }.
6. The method according to claims 2 and 3, further comprising:
when a bit sequence of ACK/NACK response information needing to be sent is obtained, if at most M-bit ACK/NACK response information appointed by a base station and UE can be sent on a PUSCH, and the total bit number of the ACK/NACK response information needing to be sent currently exceeds M bits, carrying out logic AND operation on 2 ACK/NACK response information corresponding to a PDSCH according to a preset method until the total bit number of the ACK/NACK response information does not exceed M bits, and then mapping the ACK/NACK response information after the logic AND operation to the corresponding bit sequence, wherein the value of M is {20, 21, 22, 23, 24, 25, 26 }.
7. The method of claim 6, wherein the preset method is one of the following methods:
performing logic and operation on ACK/NACK response information corresponding to PDSCHs containing 2 code word streams in all the auxiliary component carriers; if the total bit number of the ACK/NACK response information still exceeds M bits, performing logic AND operation on the ACK/NACK response information corresponding to the PDSCH containing 2 code word streams in the main component carrier;
or performing logic and operation on all ACK/NACK response information corresponding to PDSCHs containing 2 code word streams in the component carriers according to the sequence of the priority of the component carriers from low to high until the total bit number of the ACK/NACK response information does not exceed M;
or, performing logic and operation on ACK/NACK response information corresponding to the PDSCH containing 2 code word streams in all component carriers corresponding to the sub-frames according to the sequence of the sub-frames until the total bit number of the ACK/NACK response information does not exceed M;
or sequencing all the PDSCHs according to the sequence of the sub-frame first and the component carrier second or the sequence of the component carrier first and the sub-frame second, and carrying out logic AND operation on ACK/NACK response information corresponding to the PDSCHs containing 2 code word streams one by one according to the sequence from back to front or from front to back until the total information bit does not exceed M.
8. The method according to claim 2 or 3, wherein when mapping the ACK/NACK response information into a bit sequence, the mapping method is one of the following methods:
the method comprises the following steps: mapping according to a predefined component carrier sequence, mapping ACK/NACK response information of the same component carrier according to a subframe sequence or mapping according to a value of a Downlink Allocation Index (DAI) in downlink authorization information (DLassignment), wherein the ACK/NACK response information released by semi-static continuous scheduling is positioned at the forefront or the rearmost of the ACK/NACK response information fed back by the component carrier where the ACK/NACK response information is positioned;
the predefined component carrier sequence is configured in a high layer, or the predefined component carrier sequence is a component carrier index sequence, or a primary component carrier and a secondary component carrier are firstly carried out;
the quantity of the ACK/NACK response information fed back by each component carrier is determined by the quantity of the configured downlink subframes and the transmission mode, or by the quantity of the configured downlink subframes and the transmission mode, and the value of the downlink allocation index in the uplink authorization information (ULgrant);
the second method comprises the following steps: mapping according to the sequence of the sub-frames, and mapping the ACK/NACK response information on the same sub-frame according to the sequence of the predefined component carriers;
the predefined component carrier sequence is configured in a high layer, or the predefined component carrier sequence is a component carrier index sequence, or a primary component carrier and a secondary component carrier are firstly carried out.
9. The method of claim 1,
when the UE does not detect the PDSCH on the configured corresponding downlink component carrier, setting the corresponding response information as NACK;
when a base station configures that one of two transmission blocks corresponding to a PDSCH is not enabled and sends ACK/NACK response information corresponding to the PDSCH without logic AND operation, setting the response information of a code word stream corresponding to the disabled transmission block as NACK;
when the base station configures that one of two transmission blocks corresponding to the PDSCH is not enabled and sends ACK/NACK response information corresponding to the PDSCH for logic and operation, the ACK/NACK response information of the codeword stream corresponding to the transmission block that is not enabled is set as ACK, or the logic and operation result of the ACK/NACK response information corresponding to the PDSCH is ACK/NACK response information corresponding to the enabled transmission block.
10. The method of claim 1, wherein the method for obtaining the ACK/NACK response information bit sequence to be transmitted is adapted to transmit ACK/NACK response information on PUCCH in format 3.
11. The method of claim 1, wherein if the ACK/NACK response information is transmitted on the PUSCH without being encoded by using Dual reed-muller code (Dual RM), when calculating the number of coded modulation symbols required for transmitting the bit sequence of the ACK/NACK response information on the PUSCH, the number of bits O of the uplink control information to be transmitted is obtained by one of:
when the UE transmits the PUSCH according to the uplink grant UL grant information,
or
Or
Or
When the UE does not transmit the PUSCH according to the uplink authorization information UL grant information, O is equal to the length of the bit sequence of the obtained ACK/NACK response information; wherein,
the maximum value is the total number of PDSCHs sent to the UE by the base station or the maximum value in the number of downlink subframes for scheduling feedback ACK/NACK response messages in all component carriers; as long as there is one PDSCH for 2 transport blocks, TBmax2; otherwise, TBmax＝1；TBmax(c) C-1 represents the maximum value of the transport block in the component carrier C, and C is the number of the component carriers configured by the UE; o ismaxRepresents the maximum number of bits for the UE to feed back the ACK/NACK response message,k represents the number of downlink subframes in the configured proportional relation of the uplink subframes and the downlink subframes, TBxRepresents the maximum bit number of the correct and incorrect response message corresponding to the PDSCH on each downlink component carrier configured to the UE, or OmaxThe maximum bit number of the ACK/NACK response message fed back through logic and operation is represented; or,
o is equal to the resulting bit sequence length; or,
and O is equal to the quantity of ACK/NACK response information corresponding to the TB received by the UE and the ACK/NACK response information released by the semi-static persistent scheduling.
12. The method of claim 1, wherein if the ACK/NACK response information is encoded in Dual RM manner when transmitted on PUSCH, and the number of coded modulation symbols required for calculation is jointly calculated, the number of bits O of the uplink control information to be transmitted when calculating is obtained by one of the following manners:
when the UE transmits the PUSCH according to the uplink grant UL grant information,
when the UE does not transmit the PUSCH according to the UL grant information, O is equal to the length of the bit sequence of the obtained ACK/NACK response information;
the maximum value of the total number of PDSCHs corresponding to the ACK/NACK response information allocated to the two RMs is shown;
or, when the UE transmits the PUSCH according to the uplink grant UL grant information,
or
Or
Or
When the UE does not transmit the PUSCH according to the uplink authorization information UL grant information, O is equal to the length of the bit sequence of the obtained ACK/NACK response information; wherein,
the maximum value is the total number of PDSCHs sent to the UE by the base station or the maximum value in the number of downlink subframes for scheduling feedback ACK/NACK response messages in all component carriers; as long as there is one PDSCH for 2 transport blocks, TBmax2; otherwise, TBmax＝1；TBmax(c) C-1 represents the maximum value of the transport block in the component carrier C, and C is the number of the component carriers configured by the UE; o ismaxRepresents the maximum number of bits for the UE to feed back the ACK/NACK response message,k represents the number of downlink subframes in the configured proportional relation of the uplink subframes and the downlink subframes, TBxRepresents the maximum bit number of the correct and incorrect response message corresponding to the PDSCH on each downlink component carrier configured to the UE, or OmaxThe maximum bit number of the ACK/NACK response message fed back through logic and operation is represented; or,
o is equal to the length of the bit sequence of the obtained ACK/NACK response information; or,
and O is equal to the quantity of ACK/NACK response information corresponding to the TB received by the UE and the ACK/NACK response information released by the semi-static persistent scheduling.
13. The method of claim 1, wherein if the ACK/NACK response information is coded in Dual RM manner when transmitted on PUSCH, and the number of coded modulation symbols required for calculation is calculated independently, the number of bits O of uplink control information to be transmitted is calculated1，O2Obtained by one of the following ways:
when the UE transmits the PUSCH according to the uplink grant UL grant information,
when the UE does not transmit the PUSCH according to the uplink grant UL grant information,
wherein, O1，O2When the calculation is independent, the bit number of the uplink control information to be sent,
the maximum value of the total number of PDSCHs corresponding to the ACK/NACK response information allocated to the two RMs is shown, and the length of the bit sequence of the obtained ACK/NACK response information is shown by N; or,
O1the quantity of ACK/NACK response information corresponding to the TB received by the UE mapped in one Reed-Muller code is represented; o is2Indicating the number of TBs received by the UE corresponding to ACK/NACK response information mapped in another reed-muller code.
14. A method according to claim 11, 12 or 13, wherein the method is performed in a batch process
And determining according to the DAI in the uplink authorization information, wherein when a plurality of uplink authorization information are sent to the UE, the DAI in the uplink authorization information has the same value.
15. The method according to claim 1, wherein the sending of the ACK/NACK response information by the UE on the PUSCH specifically includes:
and the UE encodes the generated bit sequence of the ACK/NACK response information according to a corresponding encoding mode, obtains an encoded sequence according to the number of the encoded modulation symbols, multiplexes the encoded sequence and data together after channel interleaving, and then transmits the encoded sequence on a PUSCH.
16. A user terminal according to claim 1, characterized in that the user terminal comprises:
the acquisition module is used for acquiring a bit sequence of the ACK/NACK response information to be sent;
the calculation module is used for calculating the number of coding modulation symbols required by the bit sequence for sending the ACK/NACK response information on the PUSCH;
and the sending module is used for sending the ACK/NACK response information on a PUSCH.
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