CN102571300A - Methods for converting channel selection modes - Google Patents
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- CN102571300A CN102571300A CN2011100201577A CN201110020157A CN102571300A CN 102571300 A CN102571300 A CN 102571300A CN 2011100201577 A CN2011100201577 A CN 2011100201577A CN 201110020157 A CN201110020157 A CN 201110020157A CN 102571300 A CN102571300 A CN 102571300A
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Abstract
The invention provides two methods for converting channel selection modes. One method comprises the following steps: a base station dispatches downlink data transmission on a primary cell (Pcell) and a secondary cell (Scell) and sends physical downlink control channel (PDCCH) information and downlink data; UE (User Equipment) receives PDCCH information sent by the base station and the downlink data to generate acknowledgement character (ACK)/ negative acknowledgement character (NACK) feedback information of the Scell; if the bond ACK/NACK feedback information of the Scell is NACK or discontinuous transmission (DTX), the UE adopts the channel selection method of long term evolution (LTE) to feed back the ACK/NACK information; if the bond ACK/NACK feedback information of the Scell is neither NACK nor DTX, the UE adopts the channel selection method in a carrier association (CA) mode to feed back the ACK/NACK information. According to the methods disclosed by the invention, the resource use ratio can be improved.
Description
Technical field
The present invention relates to wireless communication technology field, particularly the method for translated channel preference pattern.
Background technology
The maximum bandwidth of LTE is 20 megahertzes (MHz).In order to improve transmission rate, enhancing (LTE-A) system of long evolving system has been proposed at present again on the basis of LTE.In the LTE-A system, be to obtain bigger bandwidth of operation through making up a plurality of unit carrier wave (CC), constitute communication system down link and up link, i.e. carrier combination (CA), thus support higher transmission rate.For example, in order to support the bandwidth of 100MHz, can obtain through the CC that makes up 5 20MHz.In this article, can each CC be called a sub-district (Cell).
Based on the CA technology, downlink data can be sent to same UE in the base station on a plurality of Cell, and correspondingly, UE need support a plurality of Cell are gone up the feedback that the downlink data that sends carries out ACK/NACK information.Wherein a kind of method is based on channel and selects transferring ACK/nack message.So-called channel is selected, and is exactly from a plurality of alternative channels, to select one, and selects a QPSK constellation point to indicate a kind of ACK/NACK information that will feed back.According to present discussion result, channel is selected the information can support to send maximum 4 bits, and can only support to feed back the ACK/NACK information of maximum 2 Cell.In discussing at present, a kind of method is that main Cell (Pcell) and time Cell (Scell) are generated the binding ACK/NACK feedback information of a bit respectively, thereby obtains two bits, i.e. b0 and b1; Simultaneously; For fear of inconsistent to above-mentioned 2 bit feedback comprehension of information of base station and UE, UE need report the number that it receives the subframe of the PDCCH that needs feeding back ACK/nack message, and its span is from 1 to 4; Its mapping relations are as shown in table 1, so need represent with 2 bit b2 and b3; Like this, UE utilizes channel to select to send the above-mentioned information of 4 bits altogether.
Table 1
In this method, as shown in table 2, the definition of descending distribution indication (DAI) is different from the method among the LTE, and DAI is the number that is used to indicate the PDCCH that needs feeding back ACK/nack message that UE receives in some subframes.Though DAI has two bits, because two Cell are only supported in the channel selection, so DAI reality only takies 1 significant bit.
Table 2
In addition, in this method, when UE only receives the downlink data that on Pcell, sends; UE adopts the channel selecting method among the similar LTE; Be ACK/NACK information of each subframe generation of Pcell, and with implicit definite its corresponding ACK/NACK channel of the method among the LTE, specifically; When having sent dynamic data on the sub-frame, its ACK/NACK channel is to confirm according to the control channel unit (CCE) of the PDCCH of this dynamic data of scheduling; When sending semi-persistent scheduling (SPS) data, its ACK/NACK channel is high-rise semi-static configuration.When UE has received downlink data on Scell, above UE just adopts statement to the channel selecting method of CA, and top method in the design limit alternative ACK/NACK channel at this moment can only be that explicit method is distributed.ACK/NACK resource indication (ARI) information of specifically, carrying among the PDCCH of data through scheduling Scell is indicated 4 alternative ACK/NACK channels.
As shown in table 3 is the mapping form that a kind of channel is selected.N representes NACK in the form, and A representes ACK, and D representes discontinuous transmission (DTX), and symbol "/" is represented perhaps.Here, have only when certain ACK/NACK information is ACK, just can select its corresponding ACK/NACK channel to transmit.A unique exception is; In order to make full use of the feedback capability of the individual channel of M (M equals 2,3 or 4); To first ACK/NACK information is NACK and situation that other ACK/NACK information all are NACK or DTX can use a QPSK constellation point of first ACK/NACK channel to indicate.In table 3, the ACK/NACK channel that can be applied to 4 ACK/NACK bits and correspondence thereof all is self-existent situation.The form of table 3 also has Nested property, for example, is changed to NACK/DTX to the 4th bit of 4 bit map lattice shown in the table 3, then obtains the mapping form of 3 bits.
Table 3
An important problem of said method is that the resource allocation that the channel under such CA pattern is selected can only be used explicit method; It is the ACK/NACK channel resource that this method does not support to use the implicit mapping of PDCCH; But need the outer explicit ACK/NACK channel of allocation, thereby cause the wasting of resources.In addition, in said method, possibly cause unnecessary retransmission.For example, the feedback information when the data of 4 sub-frame of Pcell is (NACK, ACK; ACK, ACK), and the binding ACK/NACK feedback information of Scell is when being NACK/DTX; According to the method described above; UE can feed back the binding ACK/NACK feedback information of Pcell and Scell, promptly all be NACK/DTX, thereby all data is had to retransmit in the base station.
Summary of the invention
In view of this, the invention provides the method for two kinds of translated channel preference patterns, can improve resource utilization.
Technical scheme of the present invention is achieved in that
A kind of method of translated channel preference pattern comprises:
Downlink data transmission on base station scheduling Pcell and the Scell, and send PDCCH information and downlink data;
UE receives PDCCH information and the downlink data that send the base station, generates the binding ACK/NACK feedback information of Scell;
If the binding ACK/NACK feedback information of said Scell is NACK or DTX, then UE adopts channel selecting method feeding back ACK/nack message of LTE;
If the binding ACK/NACK feedback information of said Scell is not NACK and is not DTX that then UE adopts the channel selecting method feeding back ACK/nack message under the CA pattern.
A kind of method of translated channel preference pattern is characterized in that, this method comprises:
Downlink data transmission on base station scheduling Pcell and the Scell, and send PDCCH information and downlink data;
UE receives PDCCH information and the downlink data that send the base station;
If it is NACK or DTX that first of Scell needs the corresponding feedback information of PDCCH of feeding back ACK/NACK, then UE adopts channel selecting method feeding back ACK/nack message of LTE;
If first of Scell needs the corresponding feedback information of PDCCH of feeding back ACK/NACK not to be NACK and not to be DTX that then UE adopts the channel selecting method feeding back ACK/nack message under the CA pattern.
It is thus clear that, adopt method of the present invention, can support the method for implicit assignment ACK/NACK resource among the LTE, thereby improve resource utilization.
Description of drawings
Fig. 1 is the method flow diagram of a kind of translated channel preference pattern among the present invention;
Fig. 2 is the method flow diagram of another kind of translated channel preference pattern among the present invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, describe the present invention below in conjunction with accompanying drawing and specific embodiment.
To the UE of CA pattern, when selecting feeding back ACK/nack message based on channel, in fact UE can work in one of two kinds of channel selection modes.Wherein a kind of pattern is that here, M is the size of binding window according to M ACK/NACK information on the M sub-frame of the channel selecting method feedback Pcell of similar LTE, and promptly the data on each subframe can be fed back an ACK/NACK information respectively; Another kind of pattern is the channel selecting method under the CA pattern; At this moment; Because channel is selected to support 4 bit information feedback capabilities; So on average each Cell can only feed back the information of 2 bits at most, utilize the channel selecting method of CA pattern to feed back after a plurality of ACK/NACK information on each Cell of that is to say must be passed through certain processed compressed, thereby thereby inevitably cause some extra re-transmissions to reduce downlink throughput capacity.
The present invention provides the method for these two kinds of channel selection modes of conversion, thus the ACK/NACK amount of information of maximization feedback.
UE to the CA pattern; Downlink data transmission on base station scheduling Pcell and the Scell; And transmission PDCCH information and downlink data; UE receive need the PDCCH of feeding back ACK/nack message information after, can judge whether it has lost the PDCCH of other needs feeding back ACK/nack messages in the current subframe according to the DAI among the PDCCH, and then generate the binding ACK/NACK feedback information of this Cell according to judged result.
UE can at first generate the binding ACK/NACK feedback information of Scell.Specifically, if UE finds that having lost one or more needs the PDCCH of feeding back ACK/nack message, then generating and binding the ACK/NACK feedback information is DTX; If UE does not have to find to lose the PDCCH that needs feeding back ACK/nack message; Then the ACK/NACK information of each downlink data transmission and the ACK/NACK that generates for the PDCCH that indicates SPS to discharge are carried out and operation; As long as having the corresponding ACK/NACK information of the PDCCH that needs feeding back ACK/NACK at least is NACK, just generating and binding the ACK/NACK feedback information is NACK; And have only when all need the corresponding ACK/NACK information of PDCCH of feeding back ACK/NACK all to be ACK, just generating and binding the ACK/NACK feedback information is ACK.
Then, whether UE can be the condition of NACK/DTX as the channel selection modes conversion with the binding ACK/NACK feedback information of Scell, like the method flow diagram of Fig. 1 for a kind of translated channel preference pattern of the present invention's proposition, comprising:
Step 101:UE judges whether the binding ACK/NACK feedback information of Scell is NACK/DTX, if NACK or DTX, then execution in step 102; If not NACK and be not DTX, then execution in step 103.
Step 102:UE adopts first kind of pattern, i.e. channel selecting method feeding back ACK/nack message of similar LTE, thus can optimally feed back the ACK/NACK information on the M sub-frame of Pcell.
Step 103:UE adopts second kind of pattern, i.e. channel selecting method feeding back ACK/nack message under the CA pattern.
Adopt this method; As long as the binding ACK/NACK feedback information of Scell is NACK/DTX; Just can utilize the ACK/NACK information of the maximized feedback of the channel selecting method Pcell among the similar LTE, thereby can avoid the extra re-transmission of base station the data of some Pcell.
To step 102, promptly UE adopts the channel selecting method among the similar LTE, is ACK/NACK information of each subframe generation of Pcell, and with implicit definite its corresponding ACK/NACK channel of the method among the LTE.Here, when having sent dynamic data on the sub-frame, its ACK/NACK channel is that the CCE of PDCCH according to this dynamic data of scheduling confirms; When sending the SPS data, its ACK/NACK channel is high-rise semi-static configuration.Like this, corresponding M sub-frame of binding the Pcell in the window generates M ACK/NACK information, M ACK/NACK channel of corresponding distribution; Then, based on the method that channel is selected, UE can feed back this M ACK/NACK information, for example, can adopt the mapping form that defines among the LTE or adopt mapping form as shown in table 3.
To step 103, promptly UE adopts the channel selecting method under the CA pattern to come feeding back ACK/nack message.Three preferred embodiments of the present invention are described below.
Embodiment one:
Here, suppose that 2 bit DAI territories among each PDCCH indicate two kinds of information simultaneously.Be the number that DAI indicates the PDCCH that needs feeding back ACK/nack message that sends in the current subframe, and whether indicate this PDCCH be that first that a Cell is sent needs the PDCCH of feeding back ACK/nack message.The PDCCH here comprises the PDCCH that dispatches dynamic downlink data, also can comprise the PDCCH that indicating downlink SPS discharges.As shown in table 4 is a kind of concrete define method.
Table 4
Like this, UE can judge whether it loses the PDCCH of other needs feeding back ACK/NACK informations in the current subframe according to DAI after receiving the PDCCH that needs feeding back ACK/nack message.Specifically; In a sub-frame; When UE receive on the Cell need the PDCCH of feeding back ACK/nack message the time; It is only current C ell have been sent the PDCCH that needs feeding back ACK/nack message that DAI in this PDCCH indicates the base station, still simultaneously two Cell has been sent the PDCCH that needs feeding back ACK/nack message.But; If UE does not receive any PDCCH that needs feeding back ACK/nack message in a sub-frame; UE then can not be sure of it is that the PDCCH that needs feeding back ACK/nack message is not sent in this sub-frame in the base station on earth, or UE has lost all of sending the base station and needs the PDCCH of feeding back ACK/nack message.In addition; If UE has received one or more of a Cell needed the PDCCH of feeding back ACK/nack message; But these PDCCH of its DAI indication need the PDCCH of feeding back ACK/nack message to first of this Cell, and UE then can judge UE in view of the above and necessarily lose first of this Cell needed the PDCCH of feeding back ACK/nack message.
Next, UE generates a bit to Pcell and binds the ACK/NACK feedback information.Specifically, according to DAI, if UE finds that having lost one or more needs the PDCCH of feeding back ACK/nack message, then generating and binding the ACK/NACK feedback information is DTX; If UE does not have to find to lose the PDCCH that needs feeding back ACK/nack message; Then the ACK/NACK information of each downlink data transmission and the ACK/NACK that generates for the PDCCH that indicates SPS to discharge are carried out and operation; As long as when having at least the corresponding ACK/NACK information of the PDCCH that needs feeding back ACK/NACK to be NACK, just generating and binding the ACK/NACK feedback information is NACK; And have only when all need the corresponding ACK/NACK information of PDCCH of feeding back ACK/NACK all to be ACK, just generating a binding ACK/NACK feedback information is ACK.Here,, can not distinguish NACK and DTX, thereby the binding ACK/NACK feedback information of each Cell can adopt 1 bit to represent in order to reduce feedback overhead.Like this, obtain the binding ACK/NACK feedback information that 2 bits will feed back, the binding ACK/NACK feedback information of note Pcell is b0, and the binding ACK/NACK feedback information of note Scell is b1.
Next, UE infers the base station has been sent the PDCCH that needs feeding back ACK/nack message on how many sub-frame.Here, a kind of method is to similar with prior art, and the number of the subframe of receiving with two bits indication current UE that comprises the PDCCH that needs feeding back ACK/nack message for example adopts the define method shown in the table 1.Another kind method is the definition according to above-mentioned DAI, and is as shown in table 5, and UE judges the base station has been sent the PDCCH that needs feeding back ACK/nack message on how many sub-frame.Suppose that UE has received the PDCCH that needs feeding back ACK/nack message on the X sub-frame, X≤M here, M are the sums of binding descending sub frame in the window.If first PDCCH that needs feeding back ACK/nack message that UE can judge each Cell is in this X sub-frame, then to comprise the number of the subframe of the PDCCH that needs feeding back ACK/nack message be X to the UE feedback; Otherwise the number that the UE feedback comprises the subframe of the PDCCH that needs feeding back ACK/nack message is X+1.Here, 2 bit informations of number that comprise the subframe of the PDCCH that needs feeding back ACK/nack message to this indication are designated as b2 and b3.
Table 5
Like this, UE generated 4 bits that its method of selecting through channel need feed back information (b0, b1, b2, b3).When the binding ACK/NACK of Scell feedback information is not NACK and when being not DTX, (b2 b3), correspondingly need distribute 4 ACK/NACK channels for b0, b1 to suppose to want the information of 4 bits of explicit feedback by UE.The distribution method of concrete ACK/NACK channel is described below.
The binding ACK/NACK feedback information of the corresponding Pcell of bit b0, when b0 was ACK or NACK, UE must be that first that receive that the base station sends Pcell needs the PDCCH of feeding back ACK/nack message.UE can imply according to this PDCCH and confirm an ACK/NACK channel, for example, remembers that the minimum CCE index of this PDCCH is n, then can imply according to CCE index n+1 and confirm an ACK/NACK channel.Perhaps, can only when this PDCCH comprise a plurality of CCE, just use CCE index n+1 to imply and confirm an ACK/NACK channel.Perhaps, in the time of can just thinking that this PDCCH is dispatching downlink multiple-input, multiple-output (MIMO) transfer of data, just use CCE index n+1 to imply and confirm an ACK/NACK channel.Here, do not use the implicit ACK/NACK channel of confirming of CCE index n to be because the implicit ACK/NACK channel of confirming of CCE index n has used under the binding ACK/NACK of Scell feedback information is the situation of NACK/DTX.Perhaps, the ACK/NACK channel that uses a plurality of ACK/NACK channels of high-rise explicit configuration and indicate through the ACK/NACK resource indication information (ARI) among the PDCCH of scheduling Scell data.
The ACK/NACK channel that bit b1, b2 and b3 are corresponding can only distribute according to the PDCCH of scheduling Scell, and the PDCCH of first needs feeding back ACK/nack message that promptly Scell is sent according to the base station confirms 3 ACK/NACK channels.
The binding ACK/NACK feedback information of the corresponding Scell of bit b1, when b1 was ACK or NACK, UE must be that first that receive that the base station sends Scell needs the PDCCH of feeding back ACK/nack message.The PDCCH of first needs feeding back ACK/nack message that UE can send Scell according to this base station imply definite two ACK/NACK channels; For example; The minimum CCE index of remembering this PDCCH is n, then can imply definite these two ACK/NACK channels according to CCE index n and n+1; Perhaps, can only when this PDCCH comprise a plurality of CCE, just use CCE index n and n+1 to imply and confirm these two ACK/NACK channels; Perhaps, in the time of can just thinking that this PDCCH is dispatching downlink MIMO transfer of data, just use CCE index n and n+1 to imply and confirm these two ACK/NACK channels; And the 3rd the ACK/NACK channel that indicates through a plurality of ACK/NACK channels of the explicit configuration of high level and with the ARI among the PDCCH.
Perhaps; The PDCCH of first needs feeding back ACK/nack message that UE can send Scell according to this base station imply definite ACK/NACK channel; For example, remember that the minimum CCE index of this PDCCH is n, then confirm an ACK/NACK channel according to CCE index n; And to other two ACK/NACK channels, be to use the ACK/NACK channels through a plurality of ACK/NACK channels of the explicit configuration of high level and through the ARI among the PDCCH of scheduling Scell indicate two.
Perhaps, can be through a plurality of ACK/NACK channels of the explicit configuration of high level and three ACK/NACK channels that indicate through the ARI among the scheduling PDCCH.
Here the mapping relations of 3 of dispensed ACK/NACK channels and 3 bit b1, b2 and b3 not.
Perhaps, the ACK/NACK channels that 4 bit b0, b1, b2 and b3 are corresponding all are that the PDCCH according to scheduling Scell distributes, and the PDCCH of first needs feeding back ACK/nack message that promptly Scell is sent according to the base station confirms 4 ACK/NACK channels.Wherein zero, one or two channels can be that CCE according to this PDCCH implies and confirms, other channels are according to the explicit indication of ARI among the PDCCH.Here the mapping relations of 4 of dispensed ACK/NACK channels and 4 bit b0, b1, b2 and b3 not.
Like this, after having distributed 4 ACK/NACK channels, the method that UE can utilize these 4 ACK/NACK channels to select through channel feed back 4 bits (b0, b1, b2, b3).For example, can adopt mapping form as shown in table 3.
Adopt this method, UE can feed back more ACK/NACK information as much as possible, thereby avoids extra re-transmission.For example, the feedback information when the data of 4 sub-frame of Pcell is (NACK, ACK; ACK, ACK), and the binding ACK/NACK feedback information of Scell is when being NACK/DTX; According to this method, UE adopts the method among the similar LTE to feed back 4 bit ACK of Pcell/nack message, that is to say; UE can report the data decode mistake of first subframe of base station; Then the data of three sub-frame have all been decoded success, and simultaneously, UE is NACK/DTX at the feedback information that one of implicit 4 channels that shine upon of the method that adopts LTE feeding back ACK/nack message indicates current Scell; So the base station only need retransmit the data of first subframe and the data of Scell, thereby improved the downlink resource utilance.
Embodiment two:
Here; Suppose to adopt and the DAI among the PDCCH is set with embodiment one identical method; Produce the binding ACK/NACK information b0 and the b1 that represent Pcell and Scell, and produce the information b2 and the b3 of the number of indicating the subframe that comprises the PDCCH that needs feeding back ACK/nack message.
Like this, when the binding ACK/NACK of Scell feedback information is not NACK and when being not DTX, (be b0 at 4 bit informations; B1; B2 and b3) in, b1 is the binding ACK/NACK feedback information of corresponding Scell, it can be indicated through the concrete channel selection modes that adopts of UE; Promptly when UE adopted the channel selecting method among the similar LTE, indication b1 was NACK/DTX; When UE adopted the channel selecting method under the CA pattern, indication b1 was ACK.Like this; When UE adopted the channel selecting method feeding back ACK of CA pattern/nack message, b1 had confirmed it is ACK, so do not need explicitly in the method that the channel of CA pattern is selected, to feed back b1; Be that UE only needs 3 bit (b0 of explicit feedback; B2 b3), and correspondingly need distribute 3 ACK/NACK channels.
The binding ACK/NACK feedback information of the corresponding Pcell of bit b0 can adopt the method for embodiment one to come the corresponding ACK/NACK channel of b0.
Bit b2 and b3; Because UE received necessarily that the base station sends Scell first need the PDCCH of feeding back ACK/nack message; UE can imply according to this PDCCH and confirm two ACK/NACK channels; For example, remember that the minimum CCE index of this PDCCH is n, then can imply definite these two ACK/NACK channels according to CCE index n and n+1; Perhaps, can only when this PDCCH comprise a plurality of CCE, just use CCE index n and n+1 to imply and confirm these two ACK/NACK channels; Perhaps, in the time of can just thinking that this PDCCH is dispatching downlink MIMO transfer of data, just use CCE index n and n+1 to imply and confirm these two ACK/NACK channels.Perhaps; UE can confirm an ACK/NACK channel according to CCE index n; And to another ACK/NACK channel, be to use the ACK/NACK channel through a plurality of ACK/NACK channels of the explicit configuration of high level and through the ARI among the PDCCH of scheduling Scell indicate.Perhaps, can be through a plurality of ACK/NACK channels of the explicit configuration of high level and two ACK/NACK channels that indicate through the ARI among the PDCCH of scheduling Scell.
Perhaps, the ACK/NACK channels that 3 bit b0, b2 and b3 are corresponding all are that the PDCCH according to scheduling Scell distributes, and the PDCCH of first needs feeding back ACK/nack message that promptly Scell is sent according to the base station confirms 3 ACK/NACK channels.Wherein zero, one or two channels can be that CCE according to this PDCCH implies and confirms, other channels are according to the explicit indication of ARI among the PDCCH.Here the mapping relations of 3 of dispensed ACK/NACK channels and 3 bit b0, b2 and b3 not.
Like this, after having distributed 3 ACK/NACK channels, the method that UE can utilize these 3 ACK/NACK channels to select through channel is come feeding back ACK/nack message.For example, can adopt a sub-table of mapping form as shown in table 3.For example, can only use that corresponding b3 is the row of NACK/DTX in the form 3, can only use perhaps that corresponding bl is the row of NACK/DTX in the form 3.
Adopt this method, UE can feed back more ACK information as much as possible, thereby avoids extra re-transmission.For example, the feedback information when the data of 4 sub-frame of Pcell is (NACK, ACK; ACK, ACK), and the binding ACK/NACK feedback information of Scell is when being NACK/DTX; According to this method, UE adopts the method among the similar LTE to feed back 4 bit ACK of Pcell/nack message, that is to say; UE can report the data decode mistake of first subframe of base station; Then the data of three sub-frame have all been decoded success, and simultaneously, UE is NACK/DTX at the feedback information that one of implicit 4 channels that shine upon of the method that adopts LTE feeding back ACK/nack message indicates current Scell; So the base station only need retransmit the data of first subframe and the data of Scell, thereby improved the downlink resource utilance.
Another benefit of this method is that the method for a kind of while transferring ACK/nack message and dispatch request (SR) information is provided.When SR information (1 bit information) needs and ACK/NACK information (3 bits; Be above-mentioned b0, b2 and b3) when transmitting together; Can further adopt channel selecting method feedback SR information; Can be SR information as remaining the 4th bit, 1 bit of SR information and 3 bits of ACK/NACK information are selected feedback simultaneously based on channel, thereby feed back the information of these 4 bits with 4 bit map lattice as shown in table 3.Here, during select at the channel of confirming the CA pattern 4 alternative ACK/NACK channels, wherein 3 channels are to distribute according to the method described above and corresponding to 3 bits that carry ACK/NACK information, 1 channel is SR channel and corresponding SR bit.Perhaps, when the binding ACK/NACK of Scell feedback information was NACK/DTX, the method for employing LTE was transmitted ACK/NACK information and the SR information of PCell simultaneously, has used the SR channel here; And when the binding ACK/NACK of Scell feedback information is not NACK/DTX; Adopt the channel selecting method while feeding back ACK/nack message and the SR information of CA pattern; During select at the channel of confirming the CA pattern 4 alternative ACK/NACK channels; Wherein 3 channels are to distribute according to the method described above and corresponding to 3 bits that carry ACK/NACK information; Another ACK/NACK channel is an ACK/NACK channel through the explicit configuration of high level, and perhaps through a plurality of ACK/NACK channels of the explicit configuration of high level and through the ACK/NACK channel indicating of ARI among the PDCCH of scheduling Scell, this ACK/NACK channel is as the alternative channel corresponding to the SR bit.
Embodiment three:
Here; Suppose to adopt and the DAI among the PDCCH is set with embodiment one identical method; Produce the binding ACK/NACK information b0 and the b1 that represent Pcell and Scell, and produce the information b2 and the b3 of the number of indicating the subframe that comprises the PDCCH that needs feeding back ACK/nack message.
Like this; According to the analysis in the foregoing description two; If whether the binding ACK/NACK feedback information with Scell is that NACK/DTX is the pattern that condition is changed UE feeding back ACK/nack message, can not need explicitly to transmit 1 binding ACK/NACK feedback information bits of corresponding Scell.This has caused the information of 3 bits of the explicit transmission of needs in the channel selecting method of the ACK/NACK information of two Cell of feedback, and promptly (b0, b2, b3).But channel selects to support the feedback capability of 4 bit informations, makes full use of the preferred embodiment that this 4 bit power feeds back more ACK/NACK information so the present invention describes below.Because two bits (b2 and b3) in 4 bits are used for the number that indication needs the PDCCH of feeding back ACK/nack message; Have only other 2 bits (b0 and b1) to can be used for direct transferring ACK/nack message, the present invention proposes the ACK/NACK information that these 2 bits can all be used to feed back Pcell.
2 bits that UE generation Pcell is described below are the method for feedback information in 4.At first; Each ACK/NACK information to each Pcell sorts; If there are the SPS data; Then the ACK/NACK information of SPS data makes number one, and next is first corresponding ACK/NACK of PDCCH that needs feeding back ACK/nack message, and other need the ACK/NACK information of the PDCCH of feeding back ACK/nack message to be arranged in order according to the time sequencing that it belongs to subframe then.Then; As shown in table 6; UE generates 4 kinds of feedback states of Pcell; Wherein to represent the binding ACK/NACK feedback information of Pcell be ACK to first kind of state, and promptly UE has received that correctly it all is ACK that SPS data (if existence) and all need the corresponding ACK/NACK information of PDCCH of feeding back ACK/nack message; It is ACK that second kind of state represented preceding 2 the ACK/NACK information that will feed back; And the 3rd the ACK/NACK information that will feed back is NACK/DTX; And if had other the ACK/NACK information that will feed back, then they could be any among ACK, NACK or the DTX; It is ACK that the third state is represented the 1st the ACK/NACK information that will feed back; And the 2nd the ACK/NACK information that will feed back is NACK/DTX; And if had other the ACK/NACK information that will feed back, then they could be any among ACK, NACK or the DTX; It is NACK/DTX that the 4th kind of state represented first the ACK/NACK information that will feed back, and if have other the ACK/NACK information that will feed back, then they can be any among ACK, NACK or the DTX.
Table 6
In fact the 4th kind of feedback states in the attention table 6 can also be divided into two sub-state.A kind of method of dividing sub-state is described below.First sub-state is that first ACK/NACK information is DTX, does not promptly exist SPS business and UE can judge the situation that it has lost the PDCCH of first needs feeding back ACK/nack message according to DAI.Second sub-state is that first ACK/NACK information is NACK,, has perhaps disposed the SPS business but feedback information is NACK that is; Perhaps when not having the SPS data, but UE has received that at least first needs the PDCCH feedback information of feeding back ACK/nack message is NACK; Their common ground is to have at least an ACK/NACK channel to use.
These 4 kinds of feedback states need be mapped on two bit b0 and the b1, thereby can reinstate the method feedback that channel is selected with b2 and b3 one.As shown in table 7 is a kind of mapping method example.Here, the 4th kind of feedback states be mapped to (NACK/DTX, NACK/DTX) because they represent NACK/DTX information.Say further, first sub-states correspondence of the 4th kind of feedback states (DTX, NACK/DTX), and second sub-states correspondence (NACK, NACK/DTX).First kind of feedback states correspondence (ACK; NACK/DTX), this is because when the base station was only sent a downlink data to UE, first kind of feedback states was meant that UE has correctly received these data; At this moment can confirm an ACK/NACK channel according to these data, and be used to support channel to select.
Table 7
Like this, UE generated 4 bits that its method of selecting through channel need feed back information (b0, b1, b2, b3).In order to feed back this 4 bit information, the method for 4 ACK/NACK channels of distribution of the present invention is described below.
First bit of the feedback states of the corresponding Pcell of bit b0 can adopt the method for embodiment one to come the corresponding ACK/NACK channel of b0.
Bit b1, b2 and b3 can need the PDCCH of feeding back ACK/nack message to confirm through first of Scell.Specifically; Because UE received necessarily that the base station sends Scell first need the PDCCH of feeding back ACK/nack message; UE can imply according to this PDCCH and confirm two ACK/NACK channels; For example, remember that the minimum CCE index of this PDCCH is n, then can imply definite these two ACK/NACK channels according to CCE index n and n+1; Perhaps, can only when this PDCCH comprise a plurality of CCE, just use CCE index n and n+1 to imply and confirm this ACK/NACK channel; Perhaps, in the time of can just thinking that this PDCCH is dispatching downlink MIMO transfer of data, just use CCE index n and n+1 to imply and confirm an ACK/NACK channel; And the 3rd ACK/NACK channel indicates through a plurality of ACK/NACK channels of the explicit configuration of high level and through the ARI among the PDCCH of scheduling Scell one use the ACK/NACK channel.Perhaps; UE also can confirm an ACK/NACK channel according to CCE index n; And to other two ACK/NACK channels, be to use the ACK/NACK/ channels through a plurality of ACK/NACK channels of the explicit configuration of high level and through the ARI among the PDCCH of scheduling Scell indicate two.Perhaps, can be through a plurality of ACK/NACK channels of the explicit configuration of high level and three ACK/NACK channels that indicate through the ARI among the PDCCH of scheduling Scell.Here the mapping relations of 3 of dispensed ACK/NACK channels and 3 bit b1, b2 and b3 not.
Perhaps, the ACK/NACK channels that 4 bit b0, b1, b2 and b3 are corresponding all are that the PDCCH according to scheduling Scell distributes, and the PDCCH of first needs feeding back ACK/nack message that promptly Scell is sent according to the base station confirms 4 ACK/NACK channels.Wherein zero, one or two channels can be that CCE according to this PDCCH implies and confirms, other channels are according to the explicit indication of ARI among the PDCCH.Here the mapping relations of 4 of dispensed ACK/NACK channels and 4 bit b0, b1, b2 and b3 not.
Like this, after having distributed 4 ACK/NACK channels, the method that UE can utilize these 4 ACK/NACK channels to select through channel feed back 4 bits (b0, b1, b2, b3).For example, can adopt mapping form as shown in table 3.
Embodiment four:
Here, suppose to adopt the DAI method to set up in the existing method as shown in table 2, promptly DAI is the number that is used to indicate the PDCCH that needs feeding back ACK/nack message that UE receives in some subframes.Like this, UE can judge whether it loses the PDCCH of other needs feeding back ACK/nack messages in the current subframe according to DAI after receiving the PDCCH that needs feeding back ACK/nack message.Specifically; In a sub-frame; When UE receive on the Cell need the PDCCH of feeding back ACK/nack message the time; It is only current C ell have been sent the PDCCH that needs feeding back ACK/nack message that DAI in this PDCCH indicates the base station, still simultaneously two Cell has been sent the PDCCH that needs feeding back ACK/nack message.But; If UE does not receive any PDCCH that needs feeding back ACK/nack message in a sub-frame; UE then can not be sure of it is that the PDCCH that needs feeding back ACK/nack message is not sent in this sub-frame in the base station on earth, or UE has lost all of sending the base station and needs the PDCCH of feeding back ACK/nack message.
Next, UE generates a bit to Pcell and binds the ACK/NACK feedback information.Specifically, according to DAI, if UE finds that having lost one or more needs the PDCCH of feeding back ACK/nack message, then generating and binding the ACK/NACK feedback information is DTX; If UE does not have to find to lose the PDCCH that needs feeding back ACK/nack message; Then the ACK/NACK information of each downlink data transmission and the ACK/NACK that generates for the PDCCH that indicates SPS to discharge are carried out and operation; As long as when having at least the corresponding ACK/NACK information of the PDCCH that needs feeding back ACK/NACK to be NACK, just generating and binding the ACK/NACK feedback information is NACK; And have only when all need the corresponding ACK/NACK information of PDCCH of feeding back ACK/NACK all to be ACK, just generating a binding ACK/NACK feedback information is ACK.Here,, can not distinguish NACK and DTX, thereby the binding ACK/NACK feedback information of each Cell can adopt 1 bit to represent in order to reduce feedback overhead.Like this, obtain the binding ACK/NACK feedback information that 2 bits will feed back, the binding ACK/NACK feedback information of note Pcell is b0, and the binding ACK/NACK feedback information of note Scell is b1.
Next, suppose to adopt existing method as shown in table 1, promptly generate the method for number of subframe that indication needs the PDCCH of feeding back ACK/nack message, be designated as b2 and b3.
Like this, UE generated 4 bits that its method of selecting through channel need feed back information (b0, b1, b2, b3).When the binding ACK/NACK of Scell feedback information is not NACK and when being not DTX; In 4 bit informations (being b0, b1, b2 and b3); B1 is the binding ACK/NACK feedback information of corresponding Scell; It can be indicated through the concrete channel selection modes that adopts of UE, and promptly when UE adopted the channel selecting method among the similar LTE, indication b1 was NACK/DTX; When UE adopted the channel selecting method under the CA pattern, indication b1 was ACK.Like this; When UE adopted the channel selecting method feeding back ACK of CA pattern/nack message, b1 had confirmed it is ACK, so do not need explicitly in the method that the channel of CA pattern is selected, to feed back b1; Be that UE only needs 3 bit (b0 of explicit feedback; B2 b3), and correspondingly need distribute 3 ACK/NACK channels.
Here; Because the restriction of DAI method to set up as shown in table 2; 3 corresponding ACK/NACK channels of bit b0, b2 and b3 all will distribute according to the PDCCH of scheduling Scell, promptly come 3 ACK/NACK channels of explicit indication according to the ARI among the PDCCH of scheduling Scell.When the transfer of data on a plurality of PDCCH scheduling Scell had been sent in the base station, the ARI among these PDCCH was set to identical value.
Like this, after having distributed 3 ACK/NACK channels, the method that UE can utilize these 3 ACK/NACK channels to select through channel is come feeding back ACK/nack message.For example, can adopt a sub-table of mapping form as shown in table 3.For example, can only use that corresponding b3 is the row of NACK/DTX in the form 3, can only use perhaps that corresponding b1 is the row of NACK/DTX in the form 3.
Adopt this method, UE can feed back more ACK information as much as possible, thereby avoids extra re-transmission.For example, the feedback information when the data of 4 sub-frame of Pcell is (NACK, ACK; ACK, ACK), and the binding ACK/NACK feedback information of Scell is when being NACK/DTX; According to this method, UE adopts the method among the similar LTE to feed back 4 bit ACK of Pcell/nack message, that is to say; UE can report the data decode mistake of first subframe of base station; Then the data of three sub-frame have all been decoded success, and simultaneously, UE is NACK/DTX at the feedback information that one of implicit 4 channels that shine upon of the method that adopts LTE feeding back ACK/nack message indicates current Scell; So the base station only need retransmit the data of first subframe and the data of Scell, thereby improved the downlink resource utilance.
Another benefit of this method is that the method for a kind of while transferring ACK/nack message and dispatch request (SR) information is provided.When SR information (1 bit information) needs and ACK/NACK information (3 bits; Be above-mentioned b0, b2 and b3) when feeding back together; Can further adopt channel selecting method feedback SR information; Can be SR information as remaining the 4th bit, 1 bit of SR information and 3 bits of ACK/NACK information are selected feedback simultaneously based on channel, thereby feed back the information of these 4 bits with 4 bit map lattice as shown in table 3.During select at the channel of confirming the CA pattern 4 alternative ACK/NACK channels, wherein 3 channels are to distribute according to the method described above and corresponding to 3 bits that carry ACK/NACK information, 1 channel is SR channel and corresponding SR bit.Perhaps, when the binding ACK/NACK of Scell feedback information was NACK/DTX, the method for employing LTE was transmitted ACK/NACK information and the SR information of PCell simultaneously, has used the SR channel here; And when the binding ACK/NACK of Scell feedback information is not NACK/DTX; Adopt the channel selecting method while feeding back ACK/nack message and the SR information of CA pattern; During select at the channel of confirming the CA pattern 4 alternative ACK/NACK channels; Wherein 3 channels are to distribute according to the method described above and corresponding to 3 bits that carry ACK/NACK information; Another ACK/NACK channel is an ACK/NACK channel through the explicit configuration of high level, and perhaps through a plurality of ACK/NACK channels of the explicit configuration of high level and through the ACK/NACK channel indicating of ARI among the PDCCH of scheduling Scell, this ACK/NACK channel is as the alternative channel corresponding to the SR bit.
The present invention also proposes the method for another kind of translated channel preference pattern, and this method needs with first of Scell whether the corresponding ACK/NACK information of PDCCH of feeding back ACK/NACK is the condition of NACK/DTX as the channel selection modes conversion.This method is introduced in following examples five in detail.
Embodiment five:
Here, suppose to adopt the DAI among the PDCCH to be set, produce the binding ACK/NACK information b0 that represents Pcell, and produce the information b2 and the b3 of the number of indicating the subframe that comprises the PDCCH that needs feeding back ACK/nack message with embodiment one identical method.
Like this, when the pattern of conversion UE feeding back ACK/nack message, as shown in Figure 2, the method for translated channel preference pattern may further comprise the steps:
Step 201:UE judge Scell first need whether the corresponding ACK/NACK information of PDCCH of feeding back ACK/NACK is NACK/DTX, if NACK or DTX, then execution in step 202; If not NACK and be not DTX, then execution in step 203.
Step 202:UE adopts first kind of pattern, i.e. channel selecting method feeding back ACK/nack message of similar LTE, thus can optimally feed back the ACK/NACK information on the M sub-frame of Pcell.
Step 203:UE adopts second kind of pattern, i.e. channel selecting method feeding back ACK/nack message under the CA pattern.
Adopt this method; As long as it is NACK/DTX that first of Scell needs the corresponding ACK/NACK information of PDCCH of feeding back ACK/NACK; Just can utilize the ACK/NACK information of the maximized feedback of the channel selecting method Pcell among the similar LTE, thereby can avoid the extra re-transmission of base station the data of some Pcell.
Because two bits (b2 and b3) in 4 bits are used for the number that indication needs the PDCCH of feeding back ACK/nack message, have only other 2 bits (b0 and b1) to can be used for direct transferring ACK/nack message.Here; Suppose to represent 1 bit of Pcell to bind the ACK/NACK feedback information with b0; And b1 is used to feed back the ACK/NACK information of Scell; Because the channel that UE adopts select that feedback model can indicate Scell first need whether the corresponding feedback information of PDCCH of feeding back ACK/NACK is NACK/DTX, so first two kinds of feedback states when needing the corresponding feedback information of PDCCH of feeding back ACK/NACK to be not NACK/DTX that b1 can further distinguish Scell.
The method that UE generates the feedback information b1 of Scell is described below.B1 can distinguish two kinds of feedback states; It is ACK that first kind of feedback states represented the binding ACK/NACK feedback information of Scell; On behalf of UE, second kind of feedback states received that on the Scell first needs the PDCCH of feeding back ACK/nack message; And feedback information is ACK; And second to need the corresponding feedback information of the PDCCH of feeding back ACK/nack message be NACK/DTX, and if have other the ACK/NACK information that will feed back, then they can be any among ACK, NACK or the DTX.For the mapping form that uses channel to select, first kind of feedback states corresponding A CK of b1, and second kind of corresponding NACK/DTX of feedback states.
Like this, UE generated 4 bits that its method of selecting through channel need feed back information (b0, b1, b2, b3).In order to feed back this 4 bit information, can adopt the method among the embodiment one to distribute 4 ACK/NACK channels.Then, the method that UE can utilize these 4 ACK/NACK channels to select through channel feed back 4 bits (b0, b1, b2, b3).For example, can adopt mapping form as shown in table 3.
To sum up visible, the method for two kinds of translated channel preference patterns that the present invention proposes can be supported the method for implicit assignment ACK/NACK resource, thereby improves resource utilization.And can maximize useful ACK/NACK feedback information.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (13)
1. the method for a translated channel preference pattern is characterized in that, this method comprises:
Downlink data transmission on base station scheduling main plot Pcell and time sub-district Scell, and send physical downlink control channel PDCCH information and downlink data;
User equipment (UE) receives PDCCH information and the downlink data that send the base station, generates the binding positive acknowledgement ACK/ NACK NACK feedback information of Scell;
If the binding ACK/NACK feedback information of said Scell is NACK or discontinuous transmission DTX, then UE adopts channel selecting method feeding back ACK/nack message of Long Term Evolution LTE;
If the binding ACK/NACK feedback information of said Scell is not NACK and is not DTX that then UE adopts the channel selecting method feeding back ACK/nack message under the carrier combination CA pattern.
2. method according to claim 1 is characterized in that, when the binding ACK/NACK of Scell feedback information is not NACK and when being not DTX, UE feeding back ACK/nack message comprises:
The binding ACK/NACK feedback information of UE explicit feedback Pcell, the binding ACK/NACK feedback information of Scell and UE judge the number of subframes that comprises the PDCCH that needs feeding back ACK/nack message that send the base station.
3. method according to claim 2 is characterized in that, the binding ACK/NACK feedback information of corresponding said Pcell, and the PDCCH of first needs feeding back ACK/nack message that Pcell is sent according to the base station is implicit to confirm 1 ACK/NACK channel;
The binding ACK/NACK feedback information of corresponding said Scell and UE judge the number of subframes that comprises the PDCCH that needs feeding back ACK/nack message that send the base station, and the PDCCH of first needs feeding back ACK/nack message that Scell is sent according to the base station confirms 3 ACK/NACK channels.
4. method according to claim 1 is characterized in that, when the binding ACK/NACK of Scell feedback information is not NACK and when being not DTX, UE feeding back ACK/nack message comprises:
The binding ACK/NACK feedback information of UE explicit feedback Pcell and UE judge the number of subframes that comprises the PDCCH that needs feeding back ACK/nack message that send the base station; And the binding ACK/NACK feedback information of implicit feedback Scell.
5. method according to claim 4 is characterized in that, the binding ACK/NACK feedback information of corresponding said Pcell, and the PDCCH of first needs feeding back ACK/nack message that Pcell is sent according to the base station is implicit to confirm 1 ACK/NACK channel;
Corresponding said UE judges the number of subframes that comprises the PDCCH that needs feeding back ACK/nack message that send the base station, and the PDCCH of first needs feeding back ACK/nack message that Scell is sent according to the base station confirms 2 ACK/NACK channels.
6. method according to claim 4 is characterized in that, said method further comprises: UE adopts the channel selecting method feedback scheduling request SR information under the CA pattern.
7. method according to claim 6 is characterized in that, 1 bit of said SR information and 3 bits of said ACK/NACK information are selected feedback simultaneously based on channel; In 4 alternative channels that channel is selected, 1 channel is corresponding to said SR information, and other 3 channels are corresponding to said ACK/NACK information.
8. method according to claim 1 is characterized in that, when the binding ACK/NACK of Scell feedback information is not NACK and when being not DTX, UE feeding back ACK/nack message comprises:
2 bit ACK of UE explicit feedback Pcell/NACK feedback information and UE judge the number of subframes that comprises the PDCCH that needs feeding back ACK/nack message that send the base station; And the binding ACK/NACK feedback information of implicit feedback Scell.
9. method according to claim 8 is characterized in that, 2 bit ACK of said Pcell/NACK feedback information is represented 4 kinds of feedback states of Pcell, comprising:
The binding ACK/NACK feedback information of Pcell is ACK;
Preceding 2 the ACK/NACK information that will feed back of Pcell are ACK, and the 3rd the ACK/NACK information that will feed back is NACK or DTX;
Preceding 1 the ACK/NACK information that will feed back of Pcell is ACK, and the 2nd the ACK/NACK information that will feed back is NACK or DTX;
The 1st the ACK/NACK information that will feed back of Pcell is NACK or DTX.
10. method according to claim 8; It is characterized in that; First bit in 2 bit ACK/NACK feedback information of corresponding said Pcell, the PDCCH of first needs feeding back ACK/nack message that Pcell is sent according to the base station is implicit to confirm 1 ACK/NACK channel;
Second bit and UE in 2 bit ACK/NACK feedback information of corresponding said Pcell judge the number of subframes that comprises the PDCCH that needs feeding back ACK/nack message that send the base station, and the PDCCH of first needs feeding back ACK/nack message that Scell is sent according to the base station confirms 3 ACK/NACK channels.
11. the method for a translated channel preference pattern is characterized in that, this method comprises:
Downlink data transmission on base station scheduling Pcell and the Scell, and send PDCCH information and downlink data;
UE receives PDCCH information and the downlink data that send the base station;
If it is NACK or DTX that first of Scell needs the corresponding feedback information of PDCCH of feeding back ACK/NACK, then UE adopts channel selecting method feeding back ACK/nack message of LTE;
If first of Scell needs the corresponding feedback information of PDCCH of feeding back ACK/NACK not to be NACK and not to be DTX that then UE adopts the channel selecting method feeding back ACK/nack message under the CA pattern.
12. method according to claim 11 is characterized in that, is not NACK and when being not DTX, UE feeding back ACK/nack message comprises when first of Scell needs the corresponding feedback information of PDCCH of feeding back ACK/NACK:
The binding ACK/NACK feedback information of UE explicit feedback Pcell, 1 bit ACK/NACK feedback information of Scell and UE judge the number of subframes that comprises the PDCCH that needs feeding back ACK/nack message that send the base station; And the binding ACK/NACK feedback information of implicit feedback Scell.
13. method according to claim 12 is characterized in that, l bit ACK/NACK feedback information of said Scell is represented to comprise 2 kinds of feedback states of Scell:
The binding ACK/NACK feedback information of Scell is ACK;
The 1st the ACK/NACK information that will feed back of Scell is ACK, and the 2nd the ACK/NACK information that will feed back is NACK or DTX.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103840928A (en) * | 2012-11-23 | 2014-06-04 | 美国博通公司 | System and method for network coded TCP in long term evolution (LTE) |
| WO2017101046A1 (en) * | 2015-12-16 | 2017-06-22 | 华为技术有限公司 | Radio frame transmission method, base station and user equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840928A (en) * | 2012-11-23 | 2014-06-04 | 美国博通公司 | System and method for network coded TCP in long term evolution (LTE) |
| WO2017101046A1 (en) * | 2015-12-16 | 2017-06-22 | 华为技术有限公司 | Radio frame transmission method, base station and user equipment |
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