CN101399646A - Method and apparatus for indicating ACK/NACK transmission by LTE-TDD system - Google Patents
Method and apparatus for indicating ACK/NACK transmission by LTE-TDD system Download PDFInfo
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Abstract
The invention discloses a method for indicating ACK/NACK transmission for an LTE-TDD system. The method comprises the following steps: a network side makes statistics on distributing condition of downlink service data of each user equipment; physical resource for loading ACK/NACK is determined, after determining that downlink service data of certain user equipment is scheduled by a plurality of times in a preset related period; indication information is transmitted to indicate the user equipment to transmit ACK/NACK of the downlink data on physical resource. The invention simultaneously discloses a device for indicating ACK/NACK transmission for the LTE-TDD system. The invention can uniformly arrange the physical resource in advance under the circumstance that the user equipment needs to simultaneously feed back a plurality of ACK/NACKs so as to ensure that a plurality of ACK/NACKs of the user equipment can be transmitted on the same physical resource, thereby ensuring the characteristic of single carrier.
Description
The application require on September 30th, 2007 submit that Patent Office of the People's Republic of China, application number are 200710164204.9 to, denomination of invention is the priority of the Chinese patent application of " method and apparatus of the indication ACK/NACK of LTE-TDD system transmission ", its full content is by reference in conjunction with in this application.
Technical field
The present invention relates to LTE (the Long Time Evolution of mobile communication, Long Term Evolution) technical field, more particularly, relate to a kind of LTE-TDD (Time Division Duplex, time division duplex) system's indication ACK (Acknowledgement, confirmation)/method and apparatus of NACK (Non-Acknowledgement, nonacknowledgement information) transmission.
Background technology
Third generation communication system 3G has adopted CDMA (Code Division Multiple Access, code division multiple access inserts) mode, to support multimedia service, thereby make and in several years of future, can have higher competitiveness, but keep this competitiveness in longer time in order to ensure the pool, 3GPP (3rdGeneration Partnership Project, third generation partner program) started LTE (Long Term Evolution, the Long Term Evolution) research project of 3G wireless interface technology.The pith of LTE comprises: shorten time delay, improve user data rate, improve power system capacity and covering, and reduce the cost of operator.
For FDD (Frequency Division Duplex, Frequency Division Duplexing (FDD)) system, because its up-downgoing separates on frequency, so ascending-descending subframes can be set up relation one to one at an easy rate, that is to say the control signaling of a sub-frame of uplink, ack signal for example, only corresponding descending sub frame, corresponding relation is simple relatively, fixing.Therefore, in the meeting of LTE system standard,, determine that its ACK feedback adopts the method for setting up mapping relations with the needs of the control channel that carries its dispatch for non-continuous dispatching business.
Yet for the TDD system, its up-downgoing adopts unsymmetric structure to support non-symmetrical service, and the resource quantity of up-downgoing is different, and ratio is variable, and this asymmetry structure causes up-downgoing can't set up simple one-to-one relationship.In addition, the DFT-S-OFDMA technology is adopted in the uplink of LTE system, and the single-carrier property of uplink (signaling bearer is on a physical resource) has guaranteed that upward signal has lower peak-to-average power ratio PAPR, to reduce the hardware requirement to subscriber equipment.Existing LTE-TDD system does not provide under the concrete situation of technical scheme with the bonding carrier characteristics, carries out the uplink ACK transmission.
Summary of the invention
In view of this, the invention provides the method and apparatus of a kind of LTE-TDD indication ACK/NACK of system transmission, can't under the situation of bonding carrier characteristics, carry out the problem of uplink ACK transmission to solve prior art.
The present invention is achieved in that
The method of a kind of LTE-TDD indication ACK/NACK of system transmission comprises:
Network side is added up each user's equipment downward business datum distribution situation;
Be identified for the physical resource of loading ACK/NACK by after the scheduling repeatedly judging certain subscriber equipment downlink service data in default associated period;
Send indication information to indicate this subscriber equipment at transmitting on the described physical resource of the ACK/NACK of described downlink service data.
Preferably, in the said method, be identified for the physical resource of loading ACK/NACK according to following steps:
Set up the corresponding relation of physical resource and ack channel in advance, the corresponding physical resource of the ack channel of predetermined number;
Determine the number of times that is scheduled of subscriber equipment downlink service data in default associated period, select to exist more than or equal the physical resource of the free ACK channels of described scheduling times, it is defined as being used for the physical resource of loading ACK/NACK.
Preferably, the descending sub frame quantity of described LTE tdd systems is more than sub-frame of uplink quantity.
Preferably, in the said method, network side is by extra additional Indication message in descending control signaling, the physical resource of informing subscriber equipment feeding back ACK/NACK; Perhaps, network side sends indication information by broadcast channel, informs the physical resource of subscriber equipment feeding back ACK/NACK.
Preferably, in the said method, the descending sub frame quantity of described LTE tdd systems is more than sub-frame of uplink quantity.
Preferably, in the said method, when descending sub-frame number is less than or during descending sub frame quantity:
Network side sets in advance the mapping relations of the shared physical resource of descending control signaling and feeding back ACK/NACK channel;
Described mapping relations are sent by descending control signaling, and the indication subscriber equipment is according to described mapping relations feeding back ACK/NACK on corresponding physical resource.
The present invention also discloses the device of a kind of LTE-TDD indication ACK/NACK of system transmission, comprising:
First processing unit is used to add up each user's equipment downward business datum distribution situation, and calculates in default associated period the number of times that the user's equipment downward data are scheduled;
Second processing unit is used for being identified for the physical resource of loading ACK/NACK in described default associated period when the user's equipment downward data are repeatedly dispatched;
The 3rd processing unit is used to send indication information, transmits on described physical resource at the ACK/NACK of described downlink service data to indicate this subscriber equipment.
Preferably, in the said apparatus, described second processing unit comprises:
The information reference unit is used to preserve the physical resource of foundation in advance and the corresponding relation of ack channel, the corresponding physical resource of the ack channel of predetermined number;
The physical resource determining unit, be used for the number of times that is scheduled according to subscriber equipment downlink service data in default associated period, select to exist more than or equal the physical resource of the free ACK channels of described scheduling times, it is defined as being used for the physical resource of loading ACK/NACK.
Preferably, the descending sub frame quantity of described LTE tdd systems is more than sub-frame of uplink quantity.
Preferably, in the said apparatus, described indication information is an extra additional indication information in the descending control signaling, or is carried on the indication information on the broadcast channel.
Preferably, in the said apparatus, the descending sub frame quantity of described LTE tdd systems is more than sub-frame of uplink quantity.
Preferably, said apparatus also comprises:
Manages the unit everywhere, be used for being less than or during descending sub frame quantity when descending sub-frame number, the indication information that will comprise the mapping relations of shared physical resource of the descending control signaling that presets and ACK/NACK sends to subscriber equipment by descending control signaling, indicates this subscriber equipment according to described mapping relations feeding back ACK/NACK on corresponding physical resource.
From above-mentioned technical scheme as can be seen, compared with prior art, the present invention is by judging whether subscriber equipment is repeatedly dispatched in the default associated period, if, determine physical resource according to scheduling times, and when described associated period finishes, send indication information to subscriber equipment.Can guarantee up single-carrier property according to the unified ack channel of arranging of the scheduling situation of the subscriber equipment in the associated period thus.Solve prior art and can't under the situation of bonding carrier characteristics, carry out the problem of uplink ACK transmission.
Description of drawings
Fig. 1 is a prior art first kind frame structure schematic diagram;
Fig. 2 is the prior art second class frame structure schematic diagram;
Fig. 3 is a prior art LTE-FDD system feedback ACK scheme schematic diagram;
Fig. 4 is one of ACK/NACK and service subframe mapping schematic diagram;
Fig. 5 is two of ACK/NACK and a service subframe mapping schematic diagram;
Fig. 6 is three of ACK/NACK and a service subframe mapping schematic diagram;
Fig. 7 is the flow chart of the embodiment one of the method for the indication ACK/NACK of a kind of LTE-TDD of the present invention system transmission;
Fig. 8 is 1: 6 schematic diagram at the uplink and downlink timeslot ratio of the second class frame for the present invention;
Fig. 9 is set the goal the really flow chart of physical resource of the embodiment of the invention one;
Figure 10 is the structural representation of the embodiment one of the device of the indication ACK/NACK of a kind of LTE-TDD of the present invention system transmission;
Figure 11 is the structural representation of the embodiment two of the device of the indication ACK/NACK of a kind of LTE-TDD of the present invention system transmission;
Figure 12 is the structural representation of second processing unit of the embodiment three of the device of the indication ACK/NACK of a kind of LTE-TDD of the present invention system transmission.
Embodiment
The LTE system determines to support following two class frame structures:
First kind frame structure is applicable to FDD and TDD system, and its structure as shown in Figure 1.
The frame length 10ms of described first kind frame is made up of 20 time slots, and each slot length is 0.5ms, and from 0 to 19, two continuous time slot of mark is defined as a subframe, and subframe i is made up of time slot 2i and time slot 2i+1, wherein, i=0,1 ..., 9.
Concerning the FDD system, every 10ms is in the time, because up-downgoing separates on frequency domain, the provisional capital has 10 subframes to use up and down.
And for the TDD system, every 10ms is in the time, and up-downgoing also all has 10 subframes to use, and wherein subframe 0 and subframe 5 always are assigned as downlink transfer.
Fig. 2 shows the schematic diagram of the second class frame structure.
The frame length of the second class frame also is 10ms, and every frame at first is split into the field of 2 5ms, and each field is made up of 7 business time-slots (being labeled as 0～6) and 3 special time slots (descending pilot frequency time slot, protection interval and uplink pilot time slot).Every subframe definition is a business time-slot, and wherein subframe 0 and descending pilot frequency time slot always are used for downlink transfer, and uplink pilot time slot and subframe 1 always are used for uplink.
For the data block to error of transmission is fed back re-transmission fast, and by the data block merging, make full use of the information that misdata is carried, the LTE system has adopted HARQ (Hybrid AutomaticRepeat Request mixes automatic repeat requests) technology.
Accurately and efficiently feed back designation data piece how in time, whether wrong information (being ACK or NACK signal) is the important step of setting up the HARQ process.
Uplink ACK/NACK signaling is as a uplink control signaling part, and transmission means has two kinds, a kind ofly be, when UE (User Equipment, subscriber equipment) has the uplink business data transmission, ACK/NACK signaling and business datum multiplexing transmission; Another kind is that when UE did not have uplink business data, the ACK/NACK signaling was transmitted in the frequency band that the frequency band both sides of bandwidth of operation are reserved, and adopted the frequency hopping mode to improve transmission performance.
This paper discusses at second kind of situation.
For second kind of ACK/NACK transmission means, the scheme that the LTE system determines is: the ACK/NACK of 1 bit (corresponding to the single codeword feelings) is mapped as BPSK (Binary Phase Shift Keying, biphase phase shift keying) symbol, the ACK/NACK of 2 bits (corresponding 2 code words) is mapped as QPSK (Quadrature Phase Shift Keying, quarternary phase-shift keying (QPSK)) symbol, each modulation symbol spreads to CAZAC (permanent envelope zero autocorrelation sequence), adopts the method transmission of relevant modulation.
For first kind frame structure shown in Figure 1, each PRB (Physical Resources Blocks, Physical Resource Block) can support that at most 18UE is multiplexing; For the second class frame structure shown in Figure 2, also adopt the every PRB of hopping structure to support that at most 12UE is multiplexing.
Because the ACK/NACK signaling generally only is 1 bit or 2 bits, can increase information redundance greatly if additionally increase the UE identifying information, reduce efficiency of transmission, therefore, in the LTE-FDD system, determine to adopt the mode of implicit indication, set up the mapping relations of the control channel sequence number that ACK/NACK signaling and corresponding scheduling control signaling of downlink take, made eNB (evolved base station) can judge the UE and the data block of ACK correspondence.Referring to Fig. 3, indicate the method schematic diagram of ack channel based on implicit mode for existing LTE-FDD system, wherein, by setting up the mapping relations of ACK/NACK signaling channel and corresponding scheduling control signaling of downlink channel in advance, make eNB can judge the UE and the data block of ACK signaling correspondence.
In the FDD system, because the up-downgoing of FDD system is symmetrical, so ascending-descending subframes can be set up relation one to one at an easy rate.But for the TDD system, because the unsymmetric structure of its up-downgoing can't be set up the one-to-one relationship of up-downgoing as the FDD system.Referring to Fig. 4, when descending sub frame is less than or equal sub-frame of uplink, can determine transferring ACK/NACK and service subframe mapping relations by stipulated form.Referring to Fig. 5, when descending subframe is less than sub-frame of uplink, mean that an ascending time slot need send the ack/nack signal of a plurality of descending time slot data blocks.For example, the up-downgoing ratio of first kind frame structure is that 1/9, the second class frame structure up-downgoing ratio is 1/6, and then each sub-frame of uplink need transmit the ack/nack signal of 9 or 6 descending sub frame data block correspondences.And, for a subscriber equipment, once transmit 9 or 6 ack/nack signals at most possibly, in order to ensure the single-carrier property of uplink, a plurality of ACK/NACK signalings must be unified to arrange.
Prior art does not provide concrete technical scheme at the ack/nack signal transmission that how to meet single-carrier property in this case.
In fact, those skilled in the art may expect adopting following scheme to solve: set a plurality of ACK/NACK zone in the UL subframe, the corresponding descending sub frame in each zone, adopt the method for FDD system then, still, owing to must carry out resource distribution according to maximum UE quantity, resource occupation is many like this, and the situation that a plurality of UE send ACK/NACK simultaneously in the practical application seldom, therefore, causes the very big wasting of resources.In addition, when a UE when a plurality of descending sub frames all have transmission of data blocks, a plurality of ACK/NACK are mapped to a plurality of zones, can destroy up single-carrier property.
In order to solve the problem that prior art exists, the invention provides a kind of improved technical scheme, its basic thought is: network side judges whether certain subscriber equipment downlink service data in default associated period is repeatedly dispatched, if, when described default associated period finishes, be identified for the physical resource of loading ACK/NACK, and send indication information, indication subscriber equipment feeding back ACK/NACK on described physical resource.Guaranteed single-carrier property.
At first can set up under the different time-gap ratio situation, determine the corresponding relation of uplink ACK/NACK subframe and downlink business subframe, suppose that it is 3ms that subscriber equipment is handled the time of delay of a data block, ignores signal transmission delay.
The mapping relations of the second class frame structure such as table 1 and shown in Figure 6.
Table 1
| The up-downgoing ratio | TS1 | TS2 - | TS3 - | TS4 - | TS5 - | | TS0 | |
| 1∶6 | TS3 ＊＊，TS4 ＊＊， TS5 ＊＊，TS6 ＊＊，TS0 ＊，TS2 ＊ | - | - | - | - | - | - | |
| 2∶5 | TS4 ＊＊，TS5 ＊＊，TS6 ＊＊，TS0 ＊ | TS3 ＊ | - | - | - | - | - | |
| 3∶4 | TS5 ＊＊，TS6 ＊＊ | TS0 ＊ | TS4 ＊ | - | - | - | - | |
| 4∶3 | TS6 ＊＊ | TS0 ＊ | 0 | TS5 ＊ | - | - | - | |
| 5∶2 | |
0 | 0 | 0 | TS6 ＊ | - | - | |
| 6∶1 | 0 | 0 | 0 | 0 | 0 | TS0 | - |
Wherein "
*" N-1 field in the presentation graphs 6, "
*" N-2 field in the presentation graphs 6, "-" represents that this subframe is a descending sub frame, " O " represents that this subframe does not have corresponding UL (up) ACK.
For the UL ACK/NACK that only shines upon a DL (Downlink, down link) time slot (being called single ACK/NACK situation), obviously can directly adopt the method for LTE FDD, set up corresponding relation with the control channel sequence number.When sub-frame of uplink during less than descending sub frame, can only arrange a sub-frame of uplink need transmit a plurality of ACK signalings, for the up-downgoing ratio is three kinds of situations of 3: 4/, 2: 5 and 1: 6, a certain sub-frame of uplink need send the ACK/NACK signaling of 2,4,6 descending time slot data block correspondences, and these three kinds of situations are referred to as " many ACK/NACK situation ".
Under many ACK situation, for the bonding carrier characteristics, if a subscriber equipment has a plurality of ACK or NACK to send, must unified mapping.And if employing is as the method for the implicit mapping of FDD system employing, in order to guarantee to tackle various situations, requirement eNB can discern the ACK/NACK of different user devices, need be used to send the channel resource of ACK/NACK to each user equipment allocation independently, fully.For example, many ACK situation for LTE-TDD (FS2), the quantity of supposing the maximum support of descending sub frame descending scheduling subscriber equipment is M, the channel resource that then needs to reserve is respectively 2M, 4M and 6M, if and take not according to maximum resource and to arrange channel, because each subscriber equipment is not also known the situation of other subscriber equipmenies, so may produce conflict between the different subscriber equipmenies.And in practical communication, can not all be scheduled by all subscriber equipmenies at each descending time slot, if arrange channel so take according to maximum resource, the utilance that then means channel is extremely low, especially for mini system bandwidth (for example 1.25MHz or 2.5MHz) or in the quantity of current scheduling user equipment seldom the time, the wasting of resources is very serious.
So for many ACK/NACK situation, the present invention adopts the method indication subscriber equipment of direct indication to carry out the ACK/NACK transmission, avoids the appearance of above-mentioned situation.For example, in the DL of eNB dispatch, increase the channel that specific bit is indicated its ACK feedback.In order to make those skilled in the art better understand technical solution of the present invention, be described in detail below in conjunction with drawings and Examples.
Please refer to Fig. 7, be the flow chart of the embodiment one of the method for a kind of LTE-TDD of the present invention system indication ACK/NACK transmission.
Specifically may further comprise the steps:
Step S101: network side is added up each user's equipment downward business datum distribution situation.
Step S102: whether the downlink service data of judging each subscriber equipment is scheduled, if, enter step S103, otherwise, wait for.
Step S103: judge whether same subscriber equipment is repeatedly dispatched in default associated period, if enter step S104; Otherwise, enter step S106.
Step S104: determine the number of times that is scheduled, and then definite target physical resource, enter step S105.
If subscriber equipment is repeatedly dispatched, its ACK/NACK channel that need utilize quantity to equate with scheduling times simultaneously just has been described.So described target physical resource is exactly the physical resource that corresponding ack channel quantity is greater than or equal to described scheduling times.
Step S105: when described default associated period finishes, send an ACK indication information, finish.
Described ACK indication information is used to indicate subscriber equipment to feed back on described physical resource at the repeatedly ACK or the NACK of scheduling in the described default associated period.
Step S106: send the ACK indication information, finish.
Need to prove that described default associated period can be adjusted according to user's request or network practical operation situation.
The embodiment of the invention is by setting an associated period, judge whether subscriber equipment is repeatedly dispatched in this associated period, if, after then the last scheduling in this associated period is finished, send an ACK indication information, this user all scheduling in described associated period are unified to arrange, thus, guarantee single-carrier property, and reduced the number of times that sends the ACK indication information.
Below by a concrete example the technical program is further detailed:
Please refer to Fig. 8, with the uplink and downlink timeslot ratio of the second class frame be 1: 6 be example, the uplink ACK/NACK that is labeled as down2 descending time slot correspondence among the figure sends at the ascending time slot that is being labeled as up2, all the other are similar.Suppose that network side judges certain subscriber equipment and in an associated period (be made as down2 form 6 descending time slots) 3 scheduling are arranged, respectively constantly, dispatch, 3 ACK indication informations are arranged respectively for then corresponding these three times at t1, t2 and t3.Wherein, ACK indication information 1 comprises the ACK/NACK channel Mapping of this time slot packet (being made as packet 1) to be arranged, network side is after carrying out the scheduling second time to this subscriber equipment, utilize ACK indication information 2 to upgrade described ACK indication information 1, described ACK indication information comprises the packet (being made as packet 2) of this time slot simultaneously and the ACK/NACK channel Mapping of packet 1 correspondence is arranged; Same, network side is after dispatching for the third time this subscriber equipment, utilize ACK indication information 3 to upgrade ACK indication information 2, described ACK indication information 3 comprises the ACK/NACK channel Mapping of packet (being made as packet 3), packet 1 and packet 2 correspondences of this time slot to be arranged.
When described associated period finished, network side sent to subscriber equipment with described ACK indication information 3, and subscriber equipment receives behind this ACK indication information 3 can be according to specified ACK/NACK channel feedback ACK/NACK wherein.
As can be seen, the embodiment of the invention can guarantee up single-carrier property according to the unified ack channel of arranging of the scheduling situation of the subscriber equipment in the associated period.
Need to prove that the mode that network side sends the ACK indication information can be: in the DL dispatch, increase the channel that specific bit is indicated its ACK feedback.In addition, also can send by the mode of BCH broadcasting.
Fig. 9 shows the flow chart of determining the target physical resource among the step S104 of the foregoing description.
Network side can be in advance carry out different resource groupings according to the number of loading ACK signal, and corresponding certain subscriber equipment of each group resource for example for the second class frame, can be set at 6 ack signals of a resource bearing or still less.If a certain subscriber equipment need feed back a plurality of ACK simultaneously, for the bonding carrier characteristics, all ack signals of this subscriber equipment need utilize a physical resource to send.
This flow process specifically may further comprise the steps:
Step S201: the ack channel number of determining needs according to the number of times of dispatching user facility.
Step S202: the ack channel resource group of determining this user's correspondence according to user device parameters.
Described user device parameters comprises and is used to indicate this subscriber equipment to belong to the information of which ack channel resource group.Ack channel resource group is called for short the ACK group.
Step S203: judge in this ACK group whether have enough idle channels, if enter step S204; Otherwise, enter step S205.
Step S204: be this user equipment allocation ack channel, finish.
Step S205: search for other ACK groups, judge whether to exist enough idle channels, if enter step S206; Otherwise, enter step 207.
Step S206: the ack channel resource that channel allocation ack channel resource, and release for this reason originally took, finish.
Step S207: definite no ack channel can be used, and this packet is not scheduled, and finishes.
Network side is according to the updating network parameters as a result of above-mentioned flow process, and sends corresponding information to scheduler, and described network parameter comprises all user device parameters.Scheduler is attached to ACK on the DL dispatch and sends to subscriber equipment.
Need to prove that the present invention is equally applicable to first kind frame.
Corresponding with said method, the invention also discloses the device that a kind of LTE-TDD indication ACK/NACK of system transmits, it is arranged in the network equipment, for example is present among the eNB.
Please refer to Figure 10, be the structural representation of the embodiment one of the device of a kind of LTE-TDD of the present invention system indication ACK/NACK transmission.
This device comprises first processing unit 100, second processing unit 200 and the 3rd processing unit 300.
Its operation principle and the course of work are as follows:
First processing unit, 100 each user's equipment downward business datum distribution situation of statistics, and calculate in default associated period the number of times that the user's equipment downward data are scheduled.Described second processing unit 200 obtains the result of first processing unit 100, when knowing that the user's equipment downward data are repeatedly dispatched in described default associated period, is identified for the physical resource of loading ACK/NACK according to scheduling times.Described the 3rd processing unit 300 obtains the physical resource that described second processing unit 200 is determined, sends indication information, transmits on described physical resource at the ACK/NACK of described downlink service data to indicate this subscriber equipment.
Need to prove that described default associated period can be adjusted according to user's request or network practical operation situation.
In addition, need to prove also that the mode that described the 3rd processing unit sends indication information is:, or send by the mode of broadcast channel with broadcasting by the mode of extra additional indication information in descending control signaling.
Whether the embodiment of the invention is repeatedly dispatched by judging in default associated period, if, then determine physical resource according to scheduling times, and after the last scheduling in this associated period finishes, send an ACK indication information, this user all scheduling in described associated period are unified to arrange, thus, guaranteed single-carrier property.
The foregoing description one at be the situation of the descending sub frame quantity of LTE-TDD system more than sub-frame of uplink quantity.Introduce a kind of situation that is not only applicable to descending sub frame quantity more than sub-frame of uplink quantity below, be applicable to that also descending sub frame quantity is less than the situation of sub-frame of uplink quantity.
Figure 11 shows the structural representation of embodiment two of the device of a kind of LTE-TDD of the present invention system indication ACK/NACK transmission.
On the basis of the foregoing description, can also comprise that manages unit 400 everywhere.
Described the manages unit 400 everywhere is used for being less than or during descending sub frame quantity, adopting the mode of implicit mapping when descending sub-frame number, sends indication information.The mode of described implicit mapping is specially: the indication information that will comprise the mapping relations of shared physical resource of the descending control signaling that presets and ACK/NACK sends to subscriber equipment by descending control signaling, indicates this subscriber equipment according to described mapping relations feeding back ACK/NACK on corresponding physical resource.
Figure 12 shows the structural representation of second processing unit of embodiment three of the device of a kind of LTE-TDD of the present invention system indication ACK/NACK transmission.
Described second processing unit 200 comprises: information reference unit 211 and physical resource determining unit 212.
Described information reference unit 211 is used to preserve the physical resource of foundation in advance and the corresponding relation of ack channel, the corresponding physical resource of the ack channel of predetermined number.
Described physical resource determining unit 212 is used for the number of times that is scheduled according to subscriber equipment downlink service data in default associated period, select to exist more than or equal the physical resource of the free ACK channels of described scheduling times, it is defined as being used for the physical resource of loading ACK/NACK.
The embodiment of the invention can be in LTE-TDD system descending sub-frame number during more than sub-frame of uplink quantity, need feed back under the situation of a plurality of ACK/NACK simultaneously at subscriber equipment, in advance physical resource is unified to arrange, the a plurality of ACK/NACK that guarantee subscriber equipment transmit on same physical resource, have guaranteed single-carrier property thus.
More than disclosed only be preferred implementation of the present invention; but the present invention is not limited thereto; any those skilled in the art can think do not have a creationary variation, and, all should drop in protection scope of the present invention not breaking away from some improvements and modifications of being done under the principle of the invention prerequisite.
Claims (12)
1, the method for a kind of LTE-TDD indication ACK/NACK of system transmission is characterized in that, comprising:
Network side is added up each user's equipment downward business datum distribution situation;
Be identified for the physical resource of loading ACK/NACK by after the scheduling repeatedly judging certain subscriber equipment downlink service data in default associated period;
Send indication information to indicate this subscriber equipment at transmitting on the described physical resource of the ACK/NACK of described downlink service data.
2, the method for claim 1 is characterized in that, is identified for the physical resource of loading ACK/NACK according to following steps:
Set up the corresponding relation of physical resource and ack channel in advance, the corresponding physical resource of the ack channel of predetermined number;
Determine the number of times that is scheduled of subscriber equipment downlink service data in default associated period, select to exist more than or equal the physical resource of the free ACK channels of described scheduling times, it is defined as being used for the physical resource of loading ACK/NACK.
3, method as claimed in claim 1 or 2 is characterized in that, the descending sub frame quantity of described LTE tdd systems is more than sub-frame of uplink quantity.
4, method as claimed in claim 1 or 2 is characterized in that, network side is by extra additional Indication message in descending control signaling, the physical resource of informing subscriber equipment feeding back ACK/NACK; Perhaps, network side sends indication information by broadcast channel, informs the physical resource of subscriber equipment feeding back ACK/NACK.
5, method as claimed in claim 4 is characterized in that, the descending sub frame quantity of described LTE tdd systems is more than sub-frame of uplink quantity.
6, method as claimed in claim 5 is characterized in that, when descending sub-frame number is less than or during descending sub frame quantity:
Network side sets in advance the mapping relations of the shared physical resource of descending control signaling and feeding back ACK/NACK channel;
Described mapping relations are sent by descending control signaling, and the indication subscriber equipment is according to described mapping relations feeding back ACK/NACK on corresponding physical resource.
7, the device of a kind of LTE-TDD indication ACK/NACK of system transmission is characterized in that, comprising:
First processing unit is used to add up each user's equipment downward business datum distribution situation, and calculates in default associated period the number of times that the user's equipment downward data are scheduled;
Second processing unit is used for being identified for the physical resource of loading ACK/NACK in described default associated period when the user's equipment downward data are repeatedly dispatched;
The 3rd processing unit is used to send indication information, transmits on described physical resource at the ACK/NACK of described downlink service data to indicate this subscriber equipment.
8, device as claimed in claim 7 is characterized in that, described second processing unit comprises:
The information reference unit is used to preserve the physical resource of foundation in advance and the corresponding relation of ack channel, the corresponding physical resource of the ack channel of predetermined number;
The physical resource determining unit, be used for the number of times that is scheduled according to subscriber equipment downlink service data in default associated period, select to exist more than or equal the physical resource of the free ACK channels of described scheduling times, it is defined as being used for the physical resource of loading ACK/NACK.
As claim 7 or 8 described devices, it is characterized in that 9, the descending sub frame quantity of described LTE tdd systems is more than sub-frame of uplink quantity.
As claim 7 or 8 described devices, it is characterized in that 10, described indication information is an extra additional indication information in the descending control signaling, or be carried on the indication information on the broadcast channel.
11, device as claimed in claim 10 is characterized in that, the descending sub frame quantity of described LTE tdd systems is more than sub-frame of uplink quantity.
12, device as claimed in claim 11 is characterized in that, also comprises:
Manages the unit everywhere, be used for being less than or during descending sub frame quantity when descending sub-frame number, the indication information that will comprise the mapping relations of shared physical resource of the descending control signaling that presets and ACK/NACK sends to subscriber equipment by descending control signaling, indicates this subscriber equipment according to described mapping relations feeding back ACK/NACK on corresponding physical resource.
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