CN101789851A

CN101789851A - Multicarrier system and transmission method of correct/incorrect response information thereof

Info

Publication number: CN101789851A
Application number: CN201010003429A
Authority: CN
Inventors: 梁春丽; 夏树强; 米德忠; 戴博
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-01-15
Filing date: 2010-01-15
Publication date: 2010-07-28
Anticipated expiration: 2030-01-15
Also published as: WO2011085582A1; CN101789851B

Abstract

The invention discloses a multicarrier system under large bandwidth and a transmission method of correct/incorrect response information thereof. The multicarrier system consists of a base station and a terminal, wherein the base station indicates downlink allocation indexes on a physical downlink control channel; and the terminal transmits the correct/incorrect responses information in terms of a binding or multiplexing manner allocated to the terminal by the base station on the physical uplink shared channel or the physical uplink control channel according to the received downlink allocation indexes, actually-detected component carrier amount and the correct/incorrect responses information corresponding to each code stream transmitted by the physical downlink shared channel of the downlink component carrier obtained from physical downlink shared channel detection. When the incorrect response information is transmitted, the reason to the incorrect response information is indicated to the base station according to the binding or multiplexing mode allocated to the terminal by the base station. The invention can realize transmission of the correct/incorrect response information under the condition that downlink allocation information is probable to lose.

Description

Multi-carrier system and method for sending correct/wrong response message thereof

Technical Field

The present invention relates to the field of digital communication, and in particular, to a multi-carrier system with a large bandwidth and a method for transmitting a correct/incorrect response message in the multi-carrier system.

Background

The rapid development of digital communication systems puts higher demands on the reliability of data communication, however, in a severe channel, especially in a high data rate or high-speed mobile environment, multipath interference, doppler shift, and the like seriously affect the system performance. Therefore, effective error control technology, especially Hybrid Automatic Repeat Request (HARQ) technology, has become a hot spot of research in the communication field.

In the HARQ scheme, the code transmitted by the transmitting end not only can detect errors, but also has a certain error correction capability. After receiving the code word, the decoder at the receiving end firstly checks the error condition, and if the error condition is within the error correction capability of the code, the error correction is automatically carried out; if the errors are too many and exceed the error correction capability of the code, but the errors can be detected, the receiving end sends a judgment signal to the transmitting end through a feedback channel to request the transmitting end to retransmit the information. In an OFDM (Orthogonal Frequency Division Multiplexing) system, correct or incorrect transmission is indicated by correct/incorrect Acknowledgement (ACK/NACK) control signaling, and thus whether retransmission is required is determined.

In a Downlink HARQ of a Long Term Evolution system (LTE), an ACK/NACK response message of a Physical Downlink Shared Channel (PDSCH) is transmitted on a Physical Uplink Control Channel (PUCCH) when a terminal (UE) does not have a Physical Uplink Shared Channel (PUSCH) in a current subframe; and when the UE has a PDSCH to be transmitted in the current subframe, the ACK/NACK information is multiplexed on the PUSCH and is transmitted together with the data by adopting the same modulation coding mode.

When the PDSCH only contains one transport block, the terminal feeds back a 1-bit ACK/NACK response message, and when the PDSCH contains two transport blocks, the terminal feeds back a 2-bit ACK/NACK response message.

In an Advanced International Mobile Telecommunications (IMT-Advanced) system, high-speed data transmission can be realized, the system capacity is large, the peak rate of the IMT-Advanced system can reach 1Gbit/s under the conditions of low-speed movement and hot spot coverage, and the peak rate of the IMT-Advanced system can reach 100Mbit/s under the conditions of high-speed movement and wide-area coverage.

In order to meet the requirement of the International telecommunications union-Advanced (ITU-Advanced for short), a Long Term Evolution-Advanced (Long Term Evolution-Advanced, LTE-a) system, which is an Evolution standard of LTE, 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, the bandwidth of the LTE system can be combined to obtain larger bandwidth, the 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.

After introducing carrier aggregation, in the current discussion about the relationship between downlink component carriers and PDSCH transport blocks and HARQ processes, a basic working assumption is that when space division multiplexing is not adopted, one downlink component carrier corresponds to one PDSCH transport block and one HARQ process, that is, the UE needs to feed back 1-bit ACK/NACK response information for one PDSCH transport block of each component carrier.

In addition, one current working assumption of LTE-a is that for PDSCH transmission of non-semi-persistent scheduling (SPS) on each downlink component carrier, there is a corresponding PDCCH to carry its corresponding downlink configuration information, and the PDCCH carrying the downlink configuration information and the PDSCH may be on the same component carrier (when there is no Carrier Indicator (CI) in the DCI) or may be on different component carriers (when CI is introduced in the DCI).

In the LTE-a system using the spectrum aggregation technique, the uplink bandwidth and the downlink bandwidth may include a plurality of component carriers. When the base station has a PDSCH scheduled for a certain UE on all of the downlink component carriers, and when the UE has no PUSCH to transmit in the current subframe, the terminal needs to feed back an ACK/NACK response message for PDSCH transmission of the downlink component carriers on the PUCCH, and when the UE has a PUSCH to transmit in the current subframe, the terminal may multiplex the ACK/NACK response message on the PUSCH and transmit simultaneously with the data. Therefore, for LTE-a, even in the FDD system, it is necessary to feed back ACK/NACK response messages of PDSCHs corresponding to a plurality of downlink component carriers in one uplink subframe, which is different from the FDD system of Rel-8 LTE.

For the case of sending ACK/NACK response message on PUCCH, the following three methods can be adopted:

(1) a direct method is to feed back multiple ACK/NACK response messages on multiple PUCCH channels corresponding to multiple downlink component carriers, respectively, in the same manner as LTE. The method is simple and can well maintain the compatibility with LTE, but because the uplink has a plurality of PUCCH channels for simultaneous transmission, the uplink single carrier wave characteristic is damaged, and when the power of UE is limited, the detection performance of ACK/NACK can be influenced, or the uplink coverage performance is reduced.

(2) Another method is a bundling method, in which ACK/NACK response messages of multiple downlink carriers are bundled and then fed back on a single PUCCH channel.

(3) In addition, there is a method for channel selection based on TDD system (also called multiplexing with channel selection, abbreviated as multiplexing), which uses different PUCCH channels and different modulation symbols on the channels to represent different feedback states of all carriers. The method only feeds back on one PUCCH channel, so that the problem of single carrier characteristic damage does not exist, and meanwhile, the problem of throughput reduction caused by the binding method is avoided, and the method is supported by a plurality of companies.

The first method is called NxPCCH, the second method is called bundling, and the third method is called multiplexing. Since the last two ACK/NACK feedback modes can both ensure uplink single-carrier performance, both of the two modes can be used as candidates for a feedback scheme when ACK/NACK response messages are sent on a PUCCH in an LTE-a system. However, since the downlink configuration information (carried on the corresponding PDCCH) of the PDSCH on some component carriers is lost, the UE cannot correctly detect the loss of the downlink configuration information due to lack of a corresponding mechanism, and thus the UE cannot correctly feed back the ACK/NACK response message.

Therefore, detecting the loss of the downlink configuration information at the UE side or the base station side in the LTE-a system is a problem to be solved in the design of the ACK/NACK feedback scheme. For the case of sending ACK/NACK response messages on PUSCH, there is currently no corresponding solution.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a multi-carrier system under a large bandwidth and a method for sending correct/incorrect response message in the multi-carrier system, so as to solve how to implement sending ACK/NACK response message in the multi-carrier system under the condition that downlink configuration information may be lost.

In order to solve the above problem, the present invention provides a method for sending a correct/incorrect response message in a multi-carrier system, including:

the base station indicates a downlink distribution index related to the transmission of a physical downlink shared channel on a physical downlink control channel related to the physical downlink transmission and/or indicates a downlink distribution index related to the transmission of the physical downlink shared channel on a physical downlink control channel related to the physical uplink transmission, and sends the physical downlink shared channel and a corresponding physical downlink control channel to the terminal;

the terminal detects a physical downlink control channel, and obtains a downlink distribution index V of a subframe n according to the physical downlink control channel related to physical downlink transmission_DAI ^DLAcquiring the downlink distribution index V of the subframe n according to the physical downlink control channel related to the physical uplink transmission_DAI ^UL(ii) a The actually detected number of component carriers transmitted by the physical downlink shared channel with the corresponding physical downlink control channel is U_DAIThe number of component carriers transmitted by the physical downlink shared channel without the corresponding physical downlink control channel is N_SPS；

The terminal detects the physical downlink shared channel according to the detected downlink configuration information of the physical downlink control channel to obtain a correct/error response message corresponding to each code word stream transmitted by the physical downlink shared channel of the corresponding downlink component carrier;

terminal in sub-framen + K, according to said V_DAI ^DL、V_DAI ^UL、U_DAI、N_SPSThe combination of (1) is on a physical uplink shared channel or a physical uplink control channel, and the correct/error response message is sent according to a binding or multiplexing mode configured to the terminal by the base station.

And when the terminal sends the error response message on the subframe n + K, the terminal further indicates the reason causing the error response message to the base station according to the binding or multiplexing mode configured to the terminal by the base station.

The indicating of the downlink allocation index related to the transmission of the physical downlink shared channel on the physical downlink control channel related to the physical downlink transmission is to add a downlink allocation index DAI field in a downlink control information format of the physical downlink control channel related to the transmission of the physical downlink shared channel, which is used for indicating the number of downlink component carriers which are allocated to the terminal and used for performing the transmission of the physical downlink shared channel and accumulated to the current downlink component carrier according to a certain carrier scheduling sequence in the current subframe;

the indicating of the downlink allocation index related to the transmission of the physical downlink shared channel on the physical downlink control channel related to the physical uplink transmission is to add a Downlink Allocation Index (DAI) field in a downlink control information format of the physical downlink control channel related to the transmission of the physical uplink shared channel, which is used for indicating the number of downlink component carriers allocated to the terminal in the current subframe for performing the transmission of the physical downlink shared channel.

The terminal detects a physical downlink control channel, and acquires a downlink distribution index V of a subframe n according to the physical downlink control channel related to physical downlink transmission_DAI ^DLIt means that the terminal performs the physical downlink control channel detection according to a certain carrier sequence, V_DAI ^DLTaking the value of the DAI domain in the last downlink control information format related to the transmission of the physical uplink shared channel detected by the terminal;

the terminal detects the physical downlink control channel according to the channel comparisonObtaining the downlink distribution index of the subframe n by the physical downlink control channel related to the physical uplink transmission as V_DAI ^ULIt means that if the terminal detects that there is a physical downlink control channel related to the transmission of the physical uplink shared channel, it sets V_DAI ^ULAnd the value of the DAI domain in the downlink control information format of the corresponding physical downlink control channel is obtained.

And if the terminal has a physical uplink shared channel PUSCH to be transmitted on the subframe n + K, feeding back a correct/error response message on the physical uplink shared channel, otherwise, feeding back the correct/error response message on the physical uplink control channel. Wherein:

the terminal adopts a binding mode, when a physical uplink shared channel feeds back a correct/error response message, firstly, whether at least one downlink configuration message is lost is judged, and if so, all code word streams generate error response signals; otherwise, U will be_DAI+N_SPSAnd transmitting the correct/error response message of each corresponding code word stream to the independent physical downlink shared channel for binding, and feeding back the bound correct/error response message on the physical uplink shared channel. After binding the correct/error response message, the terminal needs to send an error response signal, determine the corresponding binding number, and select scrambling for the error response message by using the binding number.

The terminal adopts a binding mode, when a physical uplink control channel feeds back a correct/wrong response message, whether at least one downlink configuration message is lost is judged firstly, and if so, the terminal does not send any correct/wrong response signal; otherwise, U will be_DAI+N_SPSAnd transmitting the correct/error response message of each corresponding code word stream to the independent physical downlink shared channel for binding, and feeding back the bound correct/error response message on the physical uplink control channel. And the terminal adopts the format 1a or 1b of the physical uplink control channel to send the bound correct/error response message.

The terminal adopts a multiplexing mode, and when the physical uplink shared channel feeds back the correct/wrong response message, the terminal firstly collects the downlink component carriers according to the downlink component carriersNumber of waves or said V_DAI ^DLAnd determining the feedback bit number of the correct/error response message, and mapping the binding value to the corresponding bit in the feedback bit number after carrying out binding operation among the code word streams on the correct/error response message detected on each code word stream.

The terminal adopts a multiplexing mode, when a physical uplink control channel feeds back correct/error response messages, firstly, the feedback bit number of the correct/error response messages is determined according to the number of downlink component carriers in a downlink component carrier set, and after the correct/error response messages detected on each code word stream are bound among the code word streams, the correct/error response messages after the feedback bits are bound are obtained; and selecting an available physical uplink control channel, and sending the bound correct/error response message by adopting a format 1 b.

And the value of K is determined according to the timing relation of the HARQ.

And only one physical downlink control channel related to the transmission of the physical uplink shared channel is transmitted in the downlink component carrier set.

The present invention also provides a multi-carrier system, comprising: a base station and a terminal, wherein:

the base station is used for indicating a downlink distribution index related to the transmission of the physical downlink shared channel on the physical downlink control channel related to the physical downlink transmission and/or indicating a downlink distribution index related to the transmission of the physical downlink shared channel on the physical downlink control channel related to the physical uplink transmission, and sending the physical downlink shared channel and the corresponding physical downlink control channel to the terminal;

a terminal for detecting a physical downlink control channel and obtaining a downlink allocation index V of a subframe n according to the physical downlink control channel related to physical downlink transmission_DAI ^DLAcquiring the downlink distribution index V of the subframe n according to the physical downlink control channel related to the physical uplink transmission_DAI ^UL(ii) a Actually detected having a phaseThe number of component carriers transmitted in the physical downlink shared channel corresponding to the physical downlink control channel is U_DAIThe number of component carriers transmitted by the physical downlink shared channel without the corresponding physical downlink control channel is N_SPS；

The terminal is further configured to perform physical downlink shared channel detection according to the detected downlink configuration information of the physical downlink control channel, and obtain a correct/error response message corresponding to each codeword stream transmitted by the physical downlink shared channel of the corresponding downlink component carrier; the terminal is on the subframe n + K according to the V_DAI ^DL、V_DAI ^UL、U_DAI、N_SPSThe combination of (1) is on a physical uplink shared channel or a physical uplink control channel, and the correct/error response message is sent according to a binding or multiplexing mode configured to the terminal by the base station.

The terminal is further configured to indicate, to the base station, a cause of the error response message according to a binding or multiplexing mode configured by the base station to the terminal when the error response message is sent on the subframe n + K.

The base station indicates a downlink allocation index related to the transmission of a physical downlink shared channel on a physical downlink control channel related to the physical downlink transmission, and adds a downlink allocation index DAI domain in a downlink control information format of the physical downlink control channel related to the transmission of the physical downlink shared channel, wherein the DAI domain is used for indicating the number of downlink component carriers which are allocated to a terminal and used for carrying out the transmission of the physical downlink shared channel and accumulated to the current downlink component carrier according to a certain carrier scheduling sequence in a current subframe;

the base station indicates a downlink allocation index related to the transmission of the physical downlink shared channel on a physical downlink control channel related to the transmission of the physical uplink shared channel, and adds a downlink allocation index DAI domain in a downlink control information format of the physical downlink control channel related to the transmission of the physical uplink shared channel, wherein the downlink allocation index DAI domain is used for indicating the number of downlink component carriers which are allocated to a terminal in a current subframe and used for carrying out the transmission of the physical downlink shared channel.

the terminal detects a physical downlink control channel, and acquires a downlink distribution index V of a subframe n according to the physical downlink control channel related to physical uplink transmission_DAI ^ULIt means that if the terminal detects that there is a physical downlink control channel related to the transmission of the physical uplink shared channel, it sets V_DAI ^ULAnd the value of the DAI domain in the downlink control information format of the corresponding physical downlink control channel is obtained.

And if the terminal has a physical uplink shared channel PUSCH to be transmitted on the subframe n + K, feeding back a correct/error response message on the physical uplink shared channel, otherwise, feeding back the correct/error response message on the physical uplink control channel. Wherein,

The terminal adopts a binding mode, when the physical uplink control channel feeds back a correct/wrong response message, whether at least one downlink configuration information is lost is judged firstly, if so, the terminal does not send any positive informationAn acknowledgement/error response signal; otherwise, U will be_DAI+N_SPSAnd transmitting the correct/error response message of each corresponding code word stream to the independent physical downlink shared channel for binding, and feeding back the bound correct/error response message on the physical uplink control channel. And the terminal adopts the format 1a or 1b of the physical uplink control channel to send the bound correct/error response message.

The terminal adopts a multiplexing mode, when the physical uplink shared channel feeds back the correct/wrong response message, firstly, the number of the downlink component carriers in the downlink component carrier set or the V_DAI ^DLAnd determining the feedback bit number of the correct/error response message, and mapping the binding value to the corresponding bit in the feedback bit number after carrying out binding operation among the code word streams on the correct/error response message detected on each code word stream.

And the value of K is determined according to the timing relation of the HARQ.

And only one physical downlink control channel which is transmitted by the base station and is related to the transmission of the physical uplink shared channel is transmitted in the downlink component carrier set.

The multi-carrier system under large bandwidth and the method for sending the correct/wrong response message in the multi-carrier system can realize the sending of the ACK/NACK response message under the condition that the downlink configuration information in the multi-carrier system is possibly lost. Further, if a NACK response message is fed back, the terminal may also indicate the reason for the NACK response to occur for the base station when sending. Two modes can be adopted, two channels are utilized for feedback, and the method has good applicability and flexibility.

Drawings

FIG. 1 is a diagram illustrating the transmission of ACK/NACK in bundling mode;

fig. 2 is a schematic diagram of ACK/NACK being sent in bundling mode and downlink configuration information loss occurring;

FIG. 3 is a diagram illustrating the ACK/NACK being transmitted on the PUSCH in multiplexing mode;

fig. 4 is a schematic diagram of ACK/NACK transmitted on PUSCH and downlink transmission including SPS PDSCH in multiplexing mode;

fig. 5 is a schematic diagram of ACK/NACK transmitted on PUSCH in multiplexing mode when downlink configuration information is lost;

fig. 6 is another schematic diagram of ACK/NACK transmitted on the PUSCH in multiplexing mode, where the downlink transmission includes SPS PDSCH transmission and downlink configuration information loss occurs;

fig. 7 is a diagram illustrating the case where ACK/NACK is transmitted on PUSCH (but the PUSCH does not have a corresponding PDCCH) or PUCCH in multiplexing mode;

fig. 8 is a diagram illustrating the case where ACK/NACK is transmitted on PUSCH (but the PUSCH does not have a corresponding PDCCH) or on PUCCH with SPSPDSCH included in the downlink transmission in multiplexing mode;

fig. 9 is a schematic diagram of ACK/NACK transmitted on PUSCH (but the PUSCH does not have a corresponding PDCCH) in multiplexing mode or on PUCCH, and when downlink configuration information loss occurs;

fig. 10 is a diagram illustrating that ACK/NACK is transmitted on a PUSCH (but the PUSCH does not have a corresponding PDCCH) or on a PUCCH in multiplexing mode, and downlink transmission includes SPSPDSCH transmission, and downlink configuration information is lost;

fig. 11 is a diagram illustrating that ACK/NACK is transmitted on PUSCH in multiplexing mode and the number of downlink component carriers is 5.

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.

The invention provides a multi-carrier system and a method for sending correct/wrong response messages in the multi-carrier system. The invention is particularly suitable for sending the ACK/NACK response message in the LTE-A system, and can ensure that the terminal UE side can correctly feed back the ACK/NACK response message and the base station side can correctly detect the condition that the UE receives the PDSCH. The present invention is primarily directed to FDD systems.

In a system (e.g., LTE-a system) using a carrier aggregation technique, it is assumed that a base station configures a Downlink Component carrier Set (Downlink Component carrier Set) S to a UE through high-layer signaling, where S includes M Downlink Component carriers, that is, S ═ DLCC₀，DLCC₁，DLCC₂，...，DLCC_M-1}. Each time the base station performs downlink scheduling on the UE, the base station performs PDSCH transmission using one or more component carriers in the downlink component carrier set S. Meanwhile, it is assumed that the mode in which the base station configures the UE to feed back the ACK/NACK response message is bundling or multiplexing.

A multi-carrier system of the present invention includes: a base station and a terminal, wherein:

a terminal for detecting a physical downlink control channel and obtaining a downlink allocation index V of a subframe n according to the physical downlink control channel related to physical downlink transmission_DAI ^DLAcquiring the downlink distribution index V of the subframe n according to the physical downlink control channel related to the physical uplink transmission_DAI ^UL(ii) a The actually detected number of component carriers transmitted by the physical downlink shared channel with the corresponding physical downlink control channel is U_DAIThe number of component carriers transmitted by the physical downlink shared channel without the corresponding physical downlink control channel is N_SPS；

The invention relates to a method for sending correct/wrong response messages in a multi-carrier system, which comprises the following steps:

the terminal is on the subframe n + K according to the V_DAI ^DL、V_DAI ^UL、U_DAI、N_SPSThe combination of (1) is on a physical uplink shared channel or a physical uplink control channel, and the correct/error response message is sent according to a binding or multiplexing mode configured to the terminal by the base station.

In the multi-carrier system and the ack/nack transmission method, the base station adds a Downlink Assignment Index (DAI) to Downlink Control Information (DCI) of a physical downlink control channel, and, more particularly,

a, a base station adds a DAI (Downlink Assignment Index) field in a DCI format of a physical Downlink control channel PDCCH (physical Downlink control channel) related to PDSCH (physical Downlink shared channel) transmission, and the DAI field is used for indicating the number of Downlink component carriers which are allocated to UE (user equipment) and used for PDSCH transmission and accumulated to the current Downlink component carrier according to a certain carrier scheduling sequence in a current subframe.

Here, it is assumed that downlink component carriers in the downlink component carrier set are numbered in a certain order, and PDSCH scheduling is performed on the corresponding carriers in this order also in downlink scheduling.

B, the base station adds a DAI (downlink Assignment index) field in a DCI format of a Physical Downlink Control Channel (PDCCH) related to Physical Uplink Shared Channel (PUSCH) transmission, and the DAI (downlink Assignment index) field is used for indicating the number of downlink component carriers which are allocated to the UE and used for carrying out PDSCH transmission in the current subframe;

if the current subframe has no PDSCH to be transmitted, the value of DAI is set to 4. It is assumed here that at most one DCI format for PUSCH transmission on an uplink component carrier is included in one downlink component carrier set.

When the added DAI field is 2 bits, the specific meaning is as shown in the following table 1:

table 1: dereferencing of downlink assignment index DAI

DAI (high, low)	Value of DAI	Number of component carriers for PDSCH transmission
DAI (high, low)	Value of DAI	Number of component carriers for PDSCH transmission	0，0	1	1 or 5
0，1	2	2	0，0	1	1 or 5
0，1	2	2	1，0	3	3
1，1	4	0 or 4	1，0	3	3

The value of the DAI field may also be more bits, for example, m bits, and the specific bit combination definition may be set according to an actual situation, which is not described herein again.

When the value of a DAI domain (called uplink DAI for short) in a DCI format related to Physical Uplink Shared Channel (PUSCH) transmission is 1 and more than 1 DCIformats related to downlink PDSCH transmission are detected, the value of the uplink DAI is 1, which indicates that the number of component carriers for PDSCH transmission is 5;

similarly, when the value of the DAI field (downlink DAI for short) in the DCI format related to the PDSCH transmission is 1 and more than 1 DCI format related to the downlink PDSCH transmission is detected, the value of the downlink DAI is 1, which indicates that the number of component carriers of the PDSCH transmission allocated to the terminal accumulated to the current component carrier is 5.

After configuring the DAI according to the above, the base station may send a physical downlink shared channel PDSCH and a corresponding physical downlink control channel PDCCH to the terminal on the subframe n according to a certain scheduling algorithm. The terminal detects the subframe n, and the detection process includes:

● terminal carries out PDCCH detection according to a certain carrier sequence and sets V_DAI ^DLTaking the value of the DAI domain in the last DCI format related to the PDSCH transmission detected by the terminal;

● if the terminal detects that there is a PDCCH related to PUSCH transmission, then set V_DAI ^ULTaking the value of the DAI domain in the corresponding DCI format;

● the number of component carriers actually detected by the terminal for PDSCH transmission with corresponding PDCCH is set as U_DAI；

● number of component carriers for PDSCH transmission without corresponding PDCCH actually detected by the terminal is set as N_SPS；

●, the terminal detects the PDSCH according to the detected downlink configuration information of the PDCCH to obtain the ACK/NACK response message corresponding to each code stream transmitted by the PDSCH of the corresponding downlink component carrier; for the PDSCH transmission without the corresponding PDCCH (e.g. SPS PDSCH transmission), the terminal performs PDSCH detection according to the configuration information during the last transmission to obtain ACK/NACK response messages corresponding to each codeword stream transmitted by the PDSCH of the corresponding component carrier.

The process that the terminal feeds back ACK/NACK to the base station on the subframe n + K according to the result obtained by detection on the subframe n comprises four combination conditions:

(1) feeding back on a Physical Uplink Shared Channel (PUSCH) by adopting an ACK/NACK bundling (binding) mode;

(2) feeding back on a Physical Uplink Control Channel (PUCCH) by adopting an ACK/NACK bundling (binding) mode;

(3) feeding back on a Physical Uplink Shared Channel (PUSCH) by adopting an ACK/NACK multiplexing mode;

(4) feeding back on a Physical Uplink Control Channel (PUCCH) by adopting an ACK/NACK multiplexing mode;

the following is a detailed description of each of these four feedback scenarios.

Firstly, an ACK/NACK bundling mode is adopted to feed back on a Physical Uplink Shared Channel (PUSCH);

and if the terminal has a physical uplink shared channel PUSCH to be transmitted on the subframe n + K, feeding back a correct/error response message on the physical uplink shared channel PUSCH.

A1, when the PUSCH is transmitted with a corresponding PDCCH, if the detection process according to the terminal in the subframe n is:

(here, DAI is 2 bits as an example)

The terminal may determine that at least one downlink configuration information is lost and then generate NACK signals for all codeword streams (one NACK signal for each codeword stream), when there is any

Otherwise, the terminal considers that no downlink configuration information is lost, and the terminal sends the U to the terminal in the downlink subframe n_DAI+N_SPSBundling (also called as "logical and", only when all ACK/NACK response messages are ACKs, the bundled ACK/NACK response messages are ACKs, or NACK) is performed on the ACK/NACK response messages of each corresponding codeword stream transmitted by the independent PDSCHs, so as to obtain bundled ACK/NACK response messages of 1 bit (corresponding to the case of only one codeword stream) or 2 bit (corresponding to the case of two codeword streams), and at this time, there is a bundled ACK/NACK response message of two codeword streams

When U is turned_DAI+N_SPSIs equal to 0 and

the terminal will not send an ACK/NACK signal.

A2, when the PUSCH transmission has no corresponding PDCCH, at this time, if there is a detection process in the subframe n according to the terminal

The terminal may determine that at least one downlink configuration information is lost and then generate a NACK signal for all codeword streams (one NACK signal for each codeword stream).

Otherwise, the terminal considers that no downlink configuration information is lost, and the terminal sends the U to the terminal in the downlink subframe n_DAI+N_SPSAnd the independent PDSCH transmits the ACK/NACK response message of each corresponding code word stream to perform binding operation, so as to obtain the bound ACK/NACK response message with 1 bit (corresponding to the condition that only one code word stream exists) or 2 bits (corresponding to the condition that two code word streams exist). At this time, N_bundled＝(U_DAI+N_SPS). For absence or presence of loss detection, N_bundledAre all the same.

When U is turned_DAI+N_SPSWhen 0, the UE will not transmit the ACK/NACK signal.

A3, A1 or A2 above, wherein N is_bundledThe method is used for selecting the scrambling code sequence when scrambling the coded ACK/NACK information so as to be used for the base station side to respectively treat two conditions that the UE feeds back NACK due to the loss of downlink configuration information and the UE feeds back NACK due to the error of PDSCH detection. The base station can acquire the specific reason for the terminal to feed back the NACK.

Secondly, an ACK/NACK bundling mode is adopted, and feedback is carried out on a physical uplink control channel PUCCH;

and if the terminal does not have a Physical Uplink Shared Channel (PUSCH) to be transmitted on the subframe n + K, feeding back a correct/error response message (ACK/NACK) on a Physical Uplink Control Channel (PUCCH).

B1, if there is a detection process in subframe n according to the terminal

The terminal determines that at least one downlink configuration information is lost. Since the UE detects thatThe downlink configuration information is lost, so that the UE does not send any signal on the PUCCH (this state of the UE is referred to as DTX, discontinuous transmission), and the base station can determine that the terminal has lost the configuration information by detecting the predetermined PUCCH and detecting that there is no signal transmission. This is because the base station obtains different detection results for three states of transmitting ACK, transmitting NACK, and not transmitting any signal.

Otherwise, it indicates that the downlink configuration information is not lost, and the terminal will send the U to the terminal in the downlink subframe n_DAI+N_SPSThe ACK/NACKs of each code word stream corresponding to the transmission of the independent PDSCH are bundled to obtain a bundled ACK/NACK response message with 1 bit (corresponding to the condition of only one code word stream) or 2 bit (corresponding to the condition of two code word streams),

and B2, sending the bundled ACK/NACK by using PUCCHnformat 1a or 1B on the PUCCH channel resources agreed by both the terminal and the base station.

Thirdly, an ACK/NACK multiplexing mode is adopted to feed back on a Physical Uplink Shared Channel (PUSCH);

and if the terminal has a Physical Uplink Shared Channel (PUSCH) to be transmitted on the subframe n + K, feeding back a correct/error response message (ACK/NACK) on the PUSCH. C1, when the PUSCH transmission has corresponding PDCCH, except thatAnd U is_DAI+N_SPSWhen the UE does not feed back the ACK/NACK information when the UE is equal to 0, and the feedback bit number of the ACK/NACK is other cases

● are especially, when

And more than 1 downlink PDSCH transmission is detectedWhen the relevant DCIformat is input,

at this time, the ACK/NACK response message corresponding to each code stream transmitted by PDSCH demodulated by PDCCH on downlink component carrier i is firstly bound between code streams to obtain a bound ACK/NACK response message which is mapped to O^ACKO th in one bit_DAI(i)-1 ^ACKIn which O is_DAI(i)-1 ^ACKIndicates the value of the DAI field in DCI related to PDCCH downlink transmission.

● are especially, when

And more than 1 dciformt associated with downlink PDSCH transmission is detected,

if there is an SPS PDSCH transmission in subframe N, i.e., N_SPSIf the code word stream is more than 0, the ACK/NACK response messages corresponding to each code word stream transmitted by the SPS PDSCH without the PDCCH are bound among the code word streams and are mapped to O according to a certain sequence^ACKLast N of the bits_SPSA bit.

C2, when there is no corresponding PDCCH in the PUSCH transmission, the terminal determines the bit number O of the ACK/NACK response message to be fed back according to the size of the downlink component carrier set S configured by the base station^ACKM is the number of downlink component carriers in the set of downlink component carriers configured for the UE.

And carrying out binding operation among the code word streams on the ACK/NACK response message corresponding to each code word stream transmitted by the PDSCH on the downlink component carrier i to obtain a bound ACK/NACK response message.

When PDSCH transmission is not detected in a certain downlink component carrier (including both cases where PDCCH is detected and where PDCCH is not detected), the corresponding ACK/NACK feedback bit is set to NACK.

Fourthly, an ACK/NACK multiplexing mode is adopted to feed back on a physical uplink control channel PUCCH;

if the terminal has no PUSCH to transmit on the subframe n + K, the terminal determines the bit number O of the frame needing to feed back the ACK/NACK response message according to the size of the downlink component carrier set S configured by the base station^ACKM is the number of downlink component carriers in the set of downlink component carriers configured for the UE.

And then, respectively performing binding operation among the code word streams on the ACK/NACK response messages corresponding to each code word stream transmitted by the PDSCH of each downlink component carrier to obtain M bound ACK/NACK response messages.

If no corresponding PDCCH is detected on some downlink component carrier(s), the corresponding feedback state is DTX, then an available PUCCH channel is selected according to the relation between the preset feedback state and the available PUCCH channels as well as b (0) b (1), and b (0) b (1) is sent by adopting format 1 b. This approach is also referred to as channel selection.

In the above four transmission modes, the value of K is determined according to the timing relationship of downlink HARQ, and generally, K is 4; and the PDCCH related to the uplink PUSCH transmission is only transmitted in a downlink component carrier set.

The invention provides a set of complete ACK/NACK feedback scheme, which is applied to a system adopting a carrier aggregation technology and realizes that ACK/NACK is respectively sent on a PUSCH and a PUCCH in a bundling or multiplexing mode.

Example 1: and the correct/error response message (ACK/NACK) adopts a bundling mode and is fed back on a Physical Uplink Shared Channel (PUSCH).

Example 1-1: as shown in fig. 1, the set of downlink component carriers configured by the base station to the terminal is S, S ═ DLCC₀，DLCC₁，DLCC₂，DLCC₃And sharing M-4 downlink ccs. The component carrier scheduled to a terminal UE for PDSCH transmission on subframe n is DLCC₀，DLCC₁，DLCC₃According to a first feedback mode,

DLCC₀the value of the DAI field of the PDCCH corresponding to the PDSCH transmission on is 1,

DLCC₁the value of the DAI field of the PDCCH corresponding to the PDSCH transmission on is 2,

DLCC₃the value of the DAI field of the PDCCH corresponding to the PDSCH transmission on is 3.

Assuming that there is no SPS transmission on the current subframe n, and the base station sends a PDCCH related to PUSCH transmission on a certain downlink component carrier, after the present invention is adopted, the value of the DAI field of the PDCCH is 3. The ACK/NACK feedback mode of the terminal is pre-configured to bundling by the base station. On the receiving side, assuming that the terminal correctly receives the PDCCH, the terminal obtains:

U_DAI＝3，N_SPS＝0

since the terminal detects that there is a PDCCH related to PUSCH transmission on the subframe n, ACK/NACK information to be fed back by the terminal on the subframe n + K is to be sent on the PUSCH.

According to the detection result:

therefore, the terminal determines that the downlink configuration information is not lost in the detection process, and therefore,

at the same time, the user can select the desired position,

for the transport block #0, the terminal will bind to one bit of information b (0) according to the detection result of PDSCH on

carriers

0, 1, 3;

for transport block #1, the terminal will be bundled into another bit of information b (1) according to the detection result of PDSCH on

carriers

0, 3;

and finally, the ACK/NACK feedback information sent on the PUSCH is b (0) b (1), and the b (0) b (1) is mapped on an appointed resource unit (RE) after being coded, scrambled and modulated and is sent out together with the PUSCH. Wherein, in the scrambling process, the selection of the scrambling code depends on N_bundledThe value of (a).

Examples 1 to 2: as shown in fig. 2, the set of downlink component carriers configured by the base station to the terminal is S, S ═ DLCC₀，DLCC₁，DLCC₂，DLCC₃And sharing M-4 downlink ccs. The component carrier scheduled to a terminal UE for PDSCH transmission on subframe n is DLCC₀，DLCC₁，DLCC₃According to a first feedback mode,

Assuming that there is no SPS transmission on the current subframe n, and the base station sends a PDCCH related to PUSCH transmission on a certain downlink component carrier, after the present invention is adopted, the value of the DAI field of the PDCCH is 3. The ACK/NACK feedback mode of the terminal is pre-configured to bundling by the base station.

On the receiving side, assuming that the terminal does not correctly receive the PDCCH corresponding to the PDSCH on the component carrier #1, the terminal obtains, in the detection process:

U_DAI＝2，N_SPS＝0

According to the detection result:

therefore, the terminal determines that the downlink configuration information of at least one component carrier is lost in the detection process, and therefore,

meanwhile, feedback bits b (0) b (1) on both transport blocks (#0, #1) will be set to NACK; and finally, the ACK/NACK feedback information sent on the PUSCH is b (0) b (1), and the b (0) b (1) is mapped on an appointed resource unit (RE) after being coded, scrambled and modulated and is sent out together with the PUSCH. Wherein, in the scrambling process, the selection of the scrambling code depends on N_bundledThe value of (a).

For the two examples 1-1, 1-2 described above,

if the two-bit feedback information b (0) b (1) finally obtained in the embodiment 1-1 is NACK according to the PDSCH detection result, the b (0) b (1) information fed back in the embodiments 1-1 and 1-2 is the same and is NACK, but the causes of the two are different,

embodiment 1-1 is due to the fact that the PDSCH is not correctly detected, and embodiment 1-2 is due to the fact that the downlink configuration information of a certain downlink component carrier is lost, therefore, the PDSCH is correctly detectedIn scrambling the b (0) b (1) encoded bits, different scrambling codes are selected to distinguish between the two cases. From the above analysis, it can be seen that for embodiment 1-1, the scrambling code will be chosen based on N_bundledWhile in the embodiment 1-2, the scrambling code is selected based on N_bundledChosen 5.

After receiving the ACK/NACK fed back by the terminal, the base station side can judge which condition the received NACK is caused by through descrambling the scrambling code sequence.

Embodiment 1-3, as shown in fig. 1, the configuration on the base station side is basically the same as embodiment 1-1, except that the base station does not transmit a PDCCH related to PUSCH transmission on the current subframe n.

On the receiving side, assuming that the terminal correctly receives the PDCCH, the terminal obtains:

U_DAI＝3，N_SPS＝0

according to the configuration, the terminal has a PUSCH to transmit on the subframe n + K, but the configuration information of the PUSCH is not obtained on the subframe n, and this case corresponds to SPS PUSCH transmission in general. According to the detection result:

therefore, the terminal determines that the downlink configuration information is not lost in the detection process, and N is_bundled＝U_DAI+N _SPS3. At the same time, the user can select the desired position,

carriers

0, 1, 3;

carriers

0, 3;

finally, theThe ACK/NACK feedback information sent on the PUSCH is b (0) b (1), and the b (0) b (1) is mapped on appointed Resource Elements (RE) after being coded, scrambled and modulated and is sent together with the PUSCH. Wherein, in the scrambling process, the selection of the scrambling code depends on N_bundledThe value of (a).

Examples 1 to 4, as shown in fig. 2, the configuration of the base station side is the same as in examples 1 to 3.

U_DAI＝2，N_SPS＝0

since the terminal detects that there is a PDCCH related to PUSCH transmission on the subframe n, ACK/NACK information to be fed back by the terminal on the subframe n + K is to be sent on the PUSCH. According to the detection result:

therefore, the terminal determines that the downlink configuration information of at least one component carrier is lost in the detection process, and thus, N_bundled＝U_DAI+N_SPS＝2。

Meanwhile, feedback bits b (0) b (1) on both transport blocks will be set to NACK; and finally, the ACK/NACK feedback information sent on the PUSCH is b (0) b (1), and the b (0) b (1) is mapped on an appointed resource unit (RE) after being coded, scrambled and modulated and is sent out together with the PUSCH. Wherein, in the scrambling process, the selection of the scrambling code depends on N_bundledThe value of (a).

For the above two embodiments 1-3 and 1-4, if the two bits of feedback information b (0) b (1) finally obtained in embodiments 1-3 are both NACK according to the PDSCH detection result, the b (0) b (1) information fed back in embodiments 1-3 and 1-4 are the same and are both NACK, but the reasons for the two are different, and the PDSCH is not correctly detected in embodiments 1-3, while the downlink configuration information of a certain downlink component carrier is lost in embodiments 1-4, so that the two cases are distinguished by selecting different scrambling codes in the process of scrambling the bits encoded by b (0) b (1).

From the above analysis, it can be seen that for embodiments 1-3, the scrambling code will be chosen according to N_bundledThe choice is 3, whereas in embodiments 1-4, the choice of scrambling code will be based on N_bundledChosen 2. Finally, the base station side can judge whether the received NACK is caused by any condition through descrambling the scrambling code sequence.

Example 2: and the ACK/NACK is fed back on the PUSCH in a multiplexing mode.

Example 2-1: as shown in fig. 3, the configuration on the base station side is basically the same as that of embodiment 1-1, except that ACK/NACK of the terminal is configured in multiplexing mode.

The downlink component carrier set configured to the terminal by the base station is S, S ═ DLCC₀，DLCC₁，DLCC₂，DLCC₃And sharing M-4 downlink ccs. The component carrier scheduled to a terminal UE for PDSCH transmission on subframe n is DLCC₀，DLCC₁，DLCC₃According to a first feedback mode,

Assuming that there is no SPS transmission on the current subframe n, and the base station sends a PDCCH related to PUSCH transmission on a certain downlink component carrier, after the present invention is adopted, the value of the DAI field of the PDCCH is 3. ACK/NACK configuration of terminal is in multiplexing mode

U_DAI＝3，N_SPS＝0

U_DAI+N _SPS3, the number of ACK/NACK bits that the terminal needs to feed backThe DAI fields of the PDCCHs corresponding to the PDSCHs of the downlink ccs #0, #1, and #3 are 1, 2, and 3, respectively, so that the ACK/NACK response messages transmitted by the PDSCHs of the downlink ccs #0, #1, and #3 are mapped to the 1 st, 2 nd, and 3 rd bits of the 3 bits, respectively, to obtain corresponding ACK/NACK response messages { HARQ _ ACK (0), HARQ _ ACK (1), and HARQ _ ACK (2) } after bundling operation among codeword streams. Because there is no SPS PDSCH transmission in subframe n, the terminal finally feeds back 3 bits of information { HARQ _ ACK (0), HARQ _ ACK (1), HARQ _ ACK (2) }, and the 3 bits of information are mapped to an agreed Resource Element (RE) after being coded and modulated, and are sent out together with the PUSCH.

Example 2-2: as shown in fig. 4, the configuration on the base station side is basically the same as that of embodiment 2-1, except that there is SPS PDSCH transmission of the UE on component carrier # 2.

U_DAI＝3，N_SPS＝1

since the terminal detects that there is a PDCCH related to PUSCH transmission on the subframe n, ACK/NACK information to be fed back by the terminal on the subframe n + K is to be sent on the PUSCH. According to the detection result, the method comprises the following steps:

U_DAI+N _SPS4, the number of ACK/NACK bits that the terminal needs to feed back

The DAI fields of the PDCCHs corresponding to the PDSCHs of the downlink ccs #0, #1, and #3 are 1, 2, and 3, respectively, so that the ACK/NACK response messages transmitted by the PDSCHs of the downlink ccs #0, #1, and #3 are mapped to the 1 st, 2 nd, and 3 rd bits of the 4 bits, respectively, to obtain corresponding ACK/NACK response messages { HARQ _ ACK (0), HARQ _ ACK (1), and HARQ _ ACK (2) } after bundling operation among codeword streams.

Since the SPS PDSCH transmission is performed on the component carrier #2 of the subframe n, the corresponding ACK/NACK response message HARQ _ ACK (3) obtained after the ACK/NACK response message corresponding to the SPS PDSCH transmission passes through bundling among the codeword streams is mapped to the last bit of the 4 bits, and together with { HARQ _ ACK (0), HARQ _ ACK (1), and HARQ _ ACK (2) }, 4-bit information in total of { HARQ _ ACK (0), HARQ _ ACK (1), HARQ _ ACK (2), and HARQ _ ACK (3) } is finally obtained, and after being coded and modulated, the 4-bit information is mapped to the appointed Resource Element (RE) and sent out together with the PUSCH.

Examples 2 to 3: as shown in fig. 5, the configuration on the base station side is the same as in embodiment 2-1.

U_DAI＝2，N_SPS＝0

U_DAI+N _SPS2, the number of ACK/NACK bits that the terminal needs to feed back

The DAI fields of the PDCCHs corresponding to the PDSCHs of the downlink ccs #0 and #3 are 1 and 3, respectively, so that the ACK/NACK response messages transmitted by the PDSCHs of the downlink ccs #0 and #3 are mapped to the 1 st and 3 rd bits of the 3 bits, respectively, to obtain corresponding ACK/NACK response messages { HARQ _ ACK (0), HARQ _ ACK (2) } obtained after bundling operation between codeword streams. Due to the fact thatThe terminal may determine that downlink configuration information of a certain downlink component carrier is lost, and according to the DAI information of the component carriers #0 and #3, the terminal may determine that a PDCCH corresponding to PDSCH transmission on the downlink component carrier #1 or #2 is lost, and specifically, which downlink component carrier terminal cannot know, but the terminal only needs to set the feedback information of HARQ ACK (1) to NACK, and the terminal finally feeds back { HARQ _ ACK (0), HARQ _ ACK (1),HARQ _ ACK (2) } total 3-bit information, and the 3-bit information is mapped to an appointed Resource Element (RE) after being coded and modulated, and is sent out together with a PUSCH.

When the base station side detects that the information corresponding to the HARQ _ ACK (1) is NACK, it can be determined that the downlink configuration information loss or PDSCH detection error occurs in the downlink component carrier # 1.

Examples 2 to 4: as shown in fig. 6, the configuration on the base station side is the same as in embodiment 2-2.

U_DAI＝2，N_SPS＝1

U_DAI+N _SPS3, the number of ACK/NACK bits that the terminal needs to feed back

The DAI fields of the PDCCHs corresponding to the PDSCHs of the downlink ccs #0 and #3 are 1 and 3, respectively, so that the ACK/NACK response messages transmitted by the PDSCHs of the downlink ccs #0 and #3 are mapped to the 1 st and 3 rd bits of the 3 bits, respectively, to obtain corresponding ACK/NACK response messages { HARQ _ ACK (0), HARQ _ ACK (2) } obtained after bundling operation between codeword streams.

Since the SPS PDSCH transmission is performed on the component carrier #2 of the subframe n, the corresponding ACK/NACK response message HARQ _ ACK (3) obtained after the ACK/NACK response message corresponding to the SPS PDSCH transmission passes bundling among the codeword streams is mapped to the last bit of the 4 bits.

Due to the fact that

The terminal may determine that downlink configuration information of a certain downlink component carrier is lost, and according to the DAI information of the component carriers #0 and #3 and the terminal knows that SPS PDSCH transmission is performed on the downlink component carrier #2, the terminal may determine that a PDCCH corresponding to PDSCH transmission on the downlink component carrier #1 is lost.

Therefore, the terminal sets the feedback information of HARQ _ ACK (1) as NACK, and finally obtains 4-bit information of { HARQ _ ACK (0), HARQ _ ACK (1), HARQ _ ACK (2), HARQ _ ACK (3) }, wherein the 4-bit information is mapped to an appointed resource unit (RE) after being coded and modulated, and is sent out together with the PUSCH.

As can be seen from embodiments 2-1 to 2-4, when the PUSCH is transmitted with the corresponding PDCCH, the feedback bit number of the ACK/NACK with feedback in multiplexing mode multiplexed on the PUSCH will depend onThen, it is determined that ACK/NACK bits of corresponding component carriers are in the O according to the DAI domain of the PDCCH_ACKThe position in the bit;

for the downlink component carrier without PDSCH detection, the corresponding ACK/NACK bit is set as NACK, and finally the ACK/NACK bit corresponding to the SPS PDSCH is mapped to the O_ACKThe last few bits of a bit.

Embodiment 2-5, as shown in fig. 7, the configuration on the base station side is basically the same as embodiment 2-1, except that the base station does not transmit a PDCCH related to PUSCH transmission on the current subframe n.

U_DAI＝3，N_SPS＝0

according to the configuration, the terminal has a PUSCH to transmit on the subframe n + K, but the configuration information of the PUSCH is not obtained on the subframe n, and this case corresponds to SPS PUSCH transmission in general. At this time, the number of ACK/NACK bits to be fed back by the terminal is O^ACKM4. That is, each downlink component carrier corresponds to 1-bit ACK/NACK feedback information (that is, no matter whether PDSCH transmission is detected on the component carrier, corresponding ACK/NACK needs to be fed back, if PDSCH transmission is not detected, the corresponding feedback bit is set to NACK), the numbers of the carrier components correspond to the final 4-bit information sequence fed back, and the ACK/NACK response messages transmitted by the PDSCHs of the downlink component carriers #0, #1 and #3 are mapped to the 1 st, 2 nd and 4 th bits of the 4 bits, respectively, according to the corresponding ACK/NACK response messages { HARQ _ ACK (0), HARQ _ ACK (1) and HARQ _ ACK (3) } obtained after bundling operation among the codeword streams.

Since the terminal does not detect PDSCH transmission on downlink component carrier #2, the ACK/NACK feedback bit HARQ _ ACK (2) corresponding to component carrier #2 is set to NACK. In addition, there is no SPS PDSCH transmission in subframe n, so the terminal finally feeds back 4-bit information in total, where the 4-bit information is coded and modulated, mapped to an agreed Resource Element (RE), and sent together with the PUSCH.

Examples 2 to 6: as shown in fig. 8, the configuration on the base station side is basically the same as that of embodiment 2-2, except that the base station does not transmit a PDCCH related to PUSCH transmission on the current subframe n.

U_DAI＝3，N_SPS＝1

according to the configuration, the terminal has a PUSCH to transmit on the subframe n + K, but the configuration information of the PUSCH is not obtained on the subframe n, and this case corresponds to SPS PUSCH transmission in general. At this time, the number of ACK/NACK bits to be fed back by the terminal is O^ACKM4. That is, each downlink component carrier corresponds to 1-bit ACK/NACK feedback information (that is, no matter whether PDSCH transmission is detected on the component carrier, corresponding ACK/NACK needs to be fed back, if PDSCH transmission is not detected, the corresponding feedback bit is set to NACK), the numbers of the carrier components correspond to the final 4-bit information sequence fed back, and the ACK/NACK response messages transmitted by the PDSCHs of the downlink component carriers #0, #1 and #3 are subjected to bundling operation among codeword streams to obtain corresponding ACK/NACK response messages { HARQ _ ACK (0), HARQ _ ACK (1) and HARQ _ ACK (3) }, and are sequentially mapped to the 1 st, 2 nd and 4 th bits of the 4 bits.

In addition, the SPS PDSCH transmission is performed on the component carrier #2 in the subframe n, so that the terminal maps the corresponding ACK/NACK feedback information HARQ _ ACK (2) to the 3 rd bit of the 4 bits, and the terminal finally feeds back 4 bits of information, including { HARQ _ ACK (0), HARQ _ ACK (1), HARQ _ ACK (2), and HARQ _ ACK (3) }, which are encoded and modulated, and then maps the 4 bits of information to the appointed Resource Element (RE) to be transmitted together with the PUSCH.

Examples 2 to 7: as shown in fig. 9, the configuration on the base station side is the same as in embodiment 2-3, except that the base station does not transmit a PDCCH related to PUSCH transmission on the current subframe n.

U_DAI＝2，N_SPS＝0

according to the configuration, the terminal has a PUSCH to transmit on the subframe n + K, but the configuration information of the PUSCH is not obtained on the subframe n, which corresponds to the SPS generallyAnd transmitting the PUSCH. At this time, the number of ACK/NACK bits to be fed back by the terminal is O^ACKM4. That is, each downlink cc corresponds to 1-bit ACK/NACK feedback information (that is, no matter whether PDSCH transmission is detected on the cc, corresponding ACK/NACK needs to be fed back, if PDSCH transmission is not detected, the corresponding feedback bit is set to NACK), the numbers of the cc components correspond to the final 4-bit information sequence, and the ACK/NACK response messages transmitted by the PDSCH of the downlink ccs #0 and #3 are mapped to the 1 st and 4 th bits of the 4 bits, respectively, according to the corresponding ACK/NACK response messages { HARQ _ ACK (0) and HARQ _ ACK (3) }, which are obtained after bundling operation between codeword streams.

Since the terminal does not detect PDSCH transmission on downlink component carrier #2, the ACK/NACK feedback bit HARQ _ ACK (2) corresponding to component carrier #2 is set to NACK.

Meanwhile, since the terminal does not correctly receive the PDCCH corresponding to the PDSCH on the component carrier #1, the terminal cannot demodulate the PDSCH on the component carrier #1, and thus the ACK/NACK feedback bit HARQ _ ACK (1) corresponding to the component carrier #1 is also set to NACK.

In addition, there is no SPS PDSCH transmission in subframe n, so the terminal finally feeds back 4-bit information in total, where the 4-bit information is coded and modulated, mapped to an agreed Resource Element (RE), and sent together with the PUSCH.

Examples 2 to 8: as shown in fig. 10, the configuration on the base station side is the same as in embodiments 2 to 4, except that the base station does not transmit a PDCCH related to PUSCH transmission on the current subframe n.

U_DAI＝2，N_SPS＝1

according to the configuration, the terminal has PUSCH to transmit on the subframe n + K, but the configuration of the PUSCHThe information is not obtained on subframe n, which corresponds to a general SPS PUSCH transmission. At this time, the number of ACK/NACK bits to be fed back by the terminal is O^ACKM4. That is, each downlink cc corresponds to 1-bit ACK/NACK feedback information (that is, no matter whether PDSCH transmission is detected on the cc, corresponding ACK/NACK needs to be fed back, if PDSCH transmission is not detected, the corresponding feedback bit is set to NACK), the numbers of the cc components correspond to the final 4-bit information sequence, and the ACK/NACK response messages transmitted by the PDSCH of the downlink ccs #0 and #3 are mapped to the 1 st and 4 th bits of the 4 bits, respectively, according to the corresponding ACK/NACK response messages { HARQ _ ACK (0) and HARQ _ ACK (3) }, which are obtained after bundling operation between codeword streams.

Since the terminal does not correctly receive the PDCCH corresponding to the PDSCH on the component carrier #1, the terminal cannot demodulate the PDSCH on the component carrier #1, and thus the ACK/NACK feedback bit HARQ _ ACK (1) corresponding to the component carrier #1 is also set to NACK.

From embodiments 2-5 to 2-8, it can be seen that when there is no corresponding PDCCH in the PUSCH transmission, the feedback bit number of ACK/NACK with feedback in multiplexing mode multiplexed on the PUSCH will depend on O_ACKWhere M is the number of downlink component carriers in a downlink component carrier set configured for the UE, and no matter whether PDSCH transmission is detected on the component carrier, corresponding ACK/NACK needs to be fed back, and if PDSCH transmission is not detected (including both cases where the base station does not perform PDSCH scheduling on the component carrier and the corresponding PDCCH is lost), the corresponding feedback bit is set to NACK.

Examples 2 to 9:

as shown in fig. 11, the set of downlink component carriers configured by the base station to the terminal is S, S ═ DLCC₀，DLCC₁，DLCC₂，DLCC₃，DLCC₄And 5 downlink component carriers are shared. The component carrier scheduled to a UE for PDSCH transmission on subframe n is DLCC₀，DLCC₁，DLCC₂，DLCC₃，DLCC₄After the invention is adopted, the water quality of the water is improved,

DLCC₂the value of the DAI field of the PDCCH corresponding to the PDSCH transmission on is 3,

DLCC₃the value of the DAI field of the PDCCH corresponding to the PDSCH transmission on is 4,

DLCC₄the value of the DAI field of the PDCCH corresponding to the PDSCH transmission on is 1.

If the base station sends the PDCCH related to the PUSCH transmission on a certain downlink component carrier, the value of the DAI domain of the PDCCH is 1 after the invention is adopted. The ACK/NACK feedback mode of the terminal is configured as multiplexing.

U_DAI＝5，N_SPS＝0

since the terminal detects that there is a PDCCH associated with PUSCH transmission on subframe n, the terminalAnd sending the ACK/NACK information to be fed back on the subframe n + K by putting the ACK/NACK information on a PUSCH. According to the detection result:

U_DAI+N_SPSsince the terminal detects more than 1 DCI format related to downlink PDSCH transmission (here, U is actually detected)_DAI5 PDCCHs related to PDSCH transmission), the number of ACK/NACK bits that the terminal needs to feed back is thus increasedThe DAI fields of the PDCCHs corresponding to the PDSCHs of the downlink ccs #0, #1, #2, and #3 are 1, 2, 3, and 4, respectively, so that the ACK/NACK response messages transmitted by the PDSCHs of the downlink ccs #0, #1, #2, and #3 undergo bundling operation between codeword streams to obtain corresponding ACK/NACK response messages { HARQ _ ACK (0), HARQ _ ACK (1), HARQ _ ACK (2), HARQ _ ACK (3) }, which are mapped to the 1 st, 2 nd, 3 rd, and 4 th bits of the 5 bits, respectively.

For downlink component carrier #4, because of it

The terminal detects more than 1 PDCCH related to downlink PDSCH transmission, therefore, the ACK/NACK response message HARQ ACK (4) obtained after the ACK/NACK response message transmitted by the PDSCH of the downlink component carrier #4 is subjected to bundling operation among code word streams is mapped to the 5 th bit of the 5-bit feedback information to be sent finally.

Because there is no SPS PDSCH transmission in subframe n, the terminal finally feeds back 5-bit information, which is { HARQ _ ACK (0), HARQ _ ACK (1), HARQ _ ACK (2), HARQ _ ACK (3), and HARQ _ ACK (4) }, and the 5-bit information is coded and modulated, then mapped onto an agreed Resource Element (RE), and sent together with the PUSCH.

Example 3: and the ACK/NACK adopts a bundling mode and is fed back on the PUCCH.

Example 3-1: as shown in fig. 1, the base station is configured toThe downlink component carrier set of the terminal is S, S ═ DLCC₀，DLCC₁，DLCC₂，DLCC₃And sharing M-4 downlink ccs. The component carrier scheduled to a UE for PDSCH transmission on subframe n is DLCC₀，DLCC₁，DLCC₃After the invention is adopted, the water quality of the water is improved,

Assuming that there is no SPS transmission on the current subframe n, and the base station sends a PDCCH related to PUSCH transmission on a certain downlink component carrier, after the present invention is adopted, the value of the DAI field of the PDCCH is 3. And configuring the ACK/NACK feedback mode of the terminal as bundling.

U_DAI＝3，N_SPS＝0

since the terminal has no PUSCH to transmit on the subframe n + K, the ACK/NACK information to be fed back by the terminal on the subframe n + K is to be sent on the PUCCH. According to the detection result:

therefore, the terminal determines that the downlink configuration information is not lost in the detection process, for the transmission block #0, the terminal binds the detection result of the PDSCH on the

carriers

0, 1 and 2 into one bit of information b (0), and for the transmission block #1, the terminal binds the detection result of the PDSCH on the

carriers

0 and 2 into another bit of information b (1); then in the terminal and base stationAnd transmitting the bundled ACK/NACK bit information b (0) b (1) by using PUCCH format 1b on the appointed PUCCH channel resources.

Example 3-2: as shown in fig. 2, the configuration on the base station side is the same as that of embodiment 3-1.

U_DAI＝2，N_SPS＝0

therefore, the terminal determines that the downlink configuration information of at least one downlink component carrier is lost in the detection process, and at this time, the terminal does not send any signal.

Example 4: and the ACK/NACK is fed back on the PUCCH by adopting a multiplexing mode.

As shown in fig. 7, the base station side configuration is the same as embodiment 3-1 except that the feedback mode of ACK/NACK is configured to be multiplexing.

Since the terminal has no PUSCH to transmit on the subframe n + K, the ACK/NACK information to be fed back by the terminal on the subframe n + K is to be sent on the PUCCH.

The terminal determines the bit number O of the ACK/NACK response message to be fed back according to the size of the downlink component carrier set S configured by the base station^ACKM4, then separatelyAnd performing binding operation on ACK/NACK response messages of corresponding code word streams transmitted by PDSCH of each downlink component carrier to obtain M bound feedback states { HARQ _ ACK (0), HARQ _ ACK (1),.. and HARQ _ ACK (M-1) }, wherein if no corresponding PDCCH is detected on some downlink component carrier(s), the corresponding feedback state is DTX, then selecting an available PUCCH channel according to the relation between a preset feedback state and the available PUCCH channel as well as b (0) b (1), and sending b (0) b (1) by adopting format 1 b.

The mapping relationship between the feedback state { HARQ _ ACK (0), HARQ _ ACK (1) }, and the mapping relationship between HARQ _ ACK (M-1) } and the available PUCCH channel and b (0) b (1) is related to the value of M. Some specific examples of the mapping relationship when M is 5/4/3/2 are given in tables 2 to 5 below.

Table 2: mapping relation between feedback state and available PUCCH and b (0) b (1) when M is 5

Table 3: mapping relation between feedback state and available PUCCH and b (0) b (1) when M is 4

Table 4: mapping relation between feedback state and available PUCCH and b (0) b (1) when M is 3

Table 5: mapping relation between feedback state and available PUCCH and b (0) b (1) when M is 2

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for transmitting a correct/incorrect response message in a multi-carrier system, comprising:

terminal detects physical downlink control channel, rootAcquiring the downlink distribution index V of the subframe n according to the physical downlink control channel related to the physical downlink transmission_DAI ^DLAcquiring the downlink distribution index V of the subframe n according to the physical downlink control channel related to the physical uplink transmission_DAI ^UL(ii) a The actually detected number of component carriers transmitted by the physical downlink shared channel with the corresponding physical downlink control channel is U_DAIThe number of component carriers transmitted by the physical downlink shared channel without the corresponding physical downlink control channel is N_SPS；

2. The transmission method of claim 1,

3. The transmission method of claim 1,

4. The transmission method of claim 3,

5. The transmission method of claim 1,

and if the terminal has a physical uplink shared channel PUSCH to be transmitted on the subframe n + K, feeding back a correct/error response message on the physical uplink shared channel, otherwise, feeding back the correct/error response message on the physical uplink control channel.

6. The transmission method of claim 5,

the terminal adopts a binding mode, when a physical uplink shared channel feeds back a correct/error response message, firstly, whether at least one downlink configuration message is lost is judged, and if so, all code word streams generate error response signals; otherwise, U will be_DAI+N_SPSAnd transmitting the correct/error response message of each corresponding code word stream to the independent physical downlink shared channel for binding, and feeding back the bound correct/error response message on the physical uplink shared channel.

7. The transmission method of claim 6,

after binding the correct/error response message, the terminal needs to send an error response signal, determine the corresponding binding number, and select scrambling for the error response message by using the binding number.

8. The transmission method of claim 5,

the terminal adopts a binding mode, when a physical uplink control channel feeds back a correct/wrong response message, whether at least one downlink configuration message is lost is judged firstly, and if so, the terminal does not send any correct/wrong response signal; otherwise, U will be_DAI+N_SPSAnd transmitting the correct/error response message of each corresponding code word stream to the independent physical downlink shared channel for binding, and feeding back the bound correct/error response message on the physical uplink control channel.

9. The transmission method of claim 8,

and the terminal adopts the format 1a or 1b of the physical uplink control channel to send the bound correct/error response message.

10. The transmission method of claim 5,

the terminal adopts a multiplexing mode, and when the physical uplink shared channel feeds back the correct/wrong response message, firstly, the correct/wrong response message is sent according to the downlinkThe number of downlink component carriers in the component carrier set or the V_DAI ^DLAnd determining the feedback bit number of the correct/error response message, and mapping the binding value to the corresponding bit in the feedback bit number after carrying out binding operation among the code word streams on the correct/error response message detected on each code word stream.

11. The transmission method of claim 5,

the terminal adopts a multiplexing mode, when the physical uplink control channel feeds back the correct/wrong response message,

firstly, determining the feedback bit number of correct/error response messages according to the number of downlink component carriers in a downlink component carrier set, and binding the correct/error response messages detected on each code word stream among the code word streams to obtain the correct/error response messages with a plurality of bound feedback bits;

and selecting an available physical uplink control channel, and sending the bound correct/error response message by adopting a format 1 b.

12. The transmission method of claim 1 or 5,

and the value of K is determined according to the timing relation of the HARQ.

13. The transmission method according to claim 1 or 3, wherein the physical downlink control channel related to physical uplink shared channel transmission is transmitted in only one downlink component carrier set.

14. A multi-carrier system comprising: a base station and a terminal, wherein:

15. The multi-carrier system of claim 14,

16. The multi-carrier system of claim 14,

17. The multi-carrier system of claim 16,

18. The multi-carrier system of claim 14,

19. The multi-carrier system of claim 18,

20. The multi-carrier system of claim 18,

21. The multi-carrier system of claim 18,

22. The multi-carrier system of claim 18,