CN101742657A - Method, system and device for distributing resource of uplink feedback signalling in LTE-A system - Google Patents

Abstract

The invention discloses a method, a system and a device for distributing resources of uplink feedback signalling in an LTE-A system. A terminal equipment acquires the number information of a downlink carrier wave currently occupied by the terminal equipment, receives downlink control signalling and acquires the initial position of resources used by the downlink control signalling belonging to the terminal equipment so that the sequence number of resources used by uplink feedback signalling is calculated, thereby effectively realizing that the resources of the uplink feedback signalling are reasonably distributed in the LTE-A system and preventing the terminal equipment from generating resource conflict when the uplink feedback signaling is transmitted.

Description

Up feedback signaling resource allocation methods, system and device in a kind of LTE-A system

Technical field

The present invention relates to the wireless communication frequency band field of resource allocation, particularly a kind of up feedback signaling resource allocation methods in the LTE-A system.

Background technology

At wireless communication field, Long Term Evolution (LTE) project is the evolution of 3G, and it improves and strengthened the air interface technologies of 3G, adopts orthogonal frequency division multiplexi (OFDM) and MIMO technique (MIMO) sole criterion as its wireless network evolution.Compare with 3G, LTE has following technical characterictic: traffic rate increases; Spectrum efficiency increases; With the Packet Service is main target, and system will be based on packet switching on overall architecture; By system design and strict QoS mechanism, guarantee the service quality of real time business; System deployment is flexible; Reduced the wireless network time delay; Increased the cell boarder bit rate; Emphasize backward compatiblely, support the Collaboration of existing 3G system and non-3GPP canonical system.Therefore, compare with 3G, LTE has more technical advantage.

At present, the LTE-A system is the improvement to former LTE system, what adopt is the spectrum aggregating technology, for the LTE-A system, it supports the system bandwidth wideer than LTE system, and support the different situation of up-downgoing carrier number, and downlink bandwidth more than or equal to upstream bandwidth or downstream bands number greater than the upstream band number.In the LTE-A system, there are following two kinds of situations in the allocated bandwidth of system, such as system bandwidth is 100MHz, a kind of may be the frequency spectrum that directly distributes the 100MHz bandwidth, the 100MHz bandwidth of the latter half all comes from the frequency spectrum (wherein, f represents frequency) shown in the first half as shown in Figure 1; And because LTE-A adopts is the spectrum aggregating technology, another situation may be to distribute to some spectrum aggregatings of existing systems, gathers into big bandwidth and uses for the LTE-A system, as shown in Figure 2, the first half is the frequency spectrum of a plurality of dispersions among the figure, and the bottom is divided into the bandwidth that obtains after the polymerization.From physical layer, do not need to distinguish both of these case.

The basic transmission plan of the LTE system that has finished substantially for standardization effort is as follows: the band resource of mode of frequency division duplexing (FDD) system and time division duplex (TDD) system distributes schematic diagram respectively shown in Fig. 3,4.Can be obtained by Fig. 3: in the FDD system, up channel and down channel occupy different frequency bands, have only a work carrier wave in the uplink and downlink transmission course, and all comprise a control signaling area and a data zone in each subframe; Can obtain by Fig. 4: in the TDD system, up channel and down channel occupy the different periods of identical frequency band, in the FDD system, have only a work carrier wave in the uplink and downlink transmission course, and all comprise a control signaling area and a data zone in each subframe.

In the LTE system, in descending control signaling when transmission, carried out in the base station, can be that each UE distributes exclusive resource, but for the transmission of up feedback signaling, then exist UE not know that other users use resource situation, and the base station can not limit the problem on feedback opportunity of each UE by scheduling.Therefore, resource contention takes place when sending up feedback signaling for fear of UE, need carry out resource allocation to up feedback signaling, in the LTE system, each up feedback signaling all is the feedback signaling of corresponding downlink data, also learn by noted earlier, on in the LTE system, following provisional capital has only a carrier wave, and descending control signaling and downlink data are one to one, therefore each descending control signaling and up feedback signaling also are one-to-one relationship, can adopt by descending control signaling when carrying out up feedback signaling resource allocation and be undertaken, that is: the UE that feeds back is according to the original position n of its employed physical resource of descending control signaling that receives _DLCalculate it and send the employed resource sequence number n of up feedback signaling _UL, represent to be with mathematical form: n _UL=F (n _DL), by the resource number n that calculates _UL, promptly can be up feedback signaling and distribute corresponding resource.Because this function satisfies one-to-one relationship, promptly different n _DLCan obtain different n after the mapping _UL, avoid UE when sending up feedback signaling, to clash with this.But in the LTE-A system, because the up-downgoing number of carriers is unequal, and there is the situation of the corresponding a plurality of descending carriers of a up-link carrier in the descending carrier number so greater than the up-link carrier number, then how is not resolved as yet for the problem of up feedback signaling Resources allocation.

Summary of the invention

In view of this, main purpose of the present invention is to provide up feedback signaling resource allocation methods in a kind of LTE-A system, makes the LTE-A system when carrying out up feedback signaling transmission, and employed band resource can be transmitted by the dispatching uplink feedback signaling in the base station.

Another object of the present invention is to provide up feedback signaling resource allocation system and device in a kind of LTE-A system, make the LTE-A system when carrying out up feedback signaling transmission, employed band resource can be transmitted by the dispatching uplink feedback signaling in the base station.

For achieving the above object, technical scheme of the present invention specifically is achieved in that

Up feedback signaling resource allocation methods in a kind of LTE-A system:

A, terminal equipment obtain the number information of self current shared descending carrier;

B, terminal equipment receive descending control signaling, and obtain the original position of the employed resource of one's own descending control signaling;

C, go out the sequence number of resource that up feedback signaling uses by the information calculations of obtaining among steps A and the step B.

Terminal equipment obtains the number information of self current shared descending carrier in the steps A by broadcast signaling.

The sequence number of calculating resource that up feedback signaling uses described in the step C is expressed as with mathematical form: n _UL=F (n _DL, L), n wherein _ULThe sequence number of representing resource that up feedback signaling uses, n _DLThe original position of expression descending control signaling employed resource, L represents the number information of the carrier number of the current shared descending carrier of terminal equipment self.

The sequence number that step C is described to calculate resource that up feedback signaling uses satisfies: the sequence number of the employed resource of up feedback signaling that the number information of the current shared descending carrier of the original position of an employed resource of descending control signaling and terminal equipment is corresponding unique.

The method of the sequence number of described calculating resource that up feedback signaling uses comprises: the number information of introducing descending carrier on the basis of the sequence number method of LTE system-computed resource that up feedback signaling uses is calculated.

The value space of the sequence number of resource that described up feedback signaling uses is continuous positive integer.

Up feedback signaling resource distributor system in a kind of LTE-A system comprises: comprise base station and UE, wherein,

The base station is used to send the number information of the shared descending carrier of each UE;

UE, be used for calculating the employed resource number of up feedback signaling, up feedback signaling be carried on the resource of sequence number correspondence of the resource that up feedback signaling uses that calculates and send according to the original position of the employed resource of descending control signaling that receives and the number information of self current shared descending carrier.

Described UE comprises: receiver module, the number information of the descending carrier that the original position of the employed resource of descending control signaling that is used to receive and this UE are shared;

Computing module is used for obtaining according to the information calculations of the shared resource of the pairing up feedback signaling of descending control signaling on each descending carrier of number information of the shared descending carrier of the original position of the employed resource of descending control signaling that receives and this UE the sequence number of resource that up feedback signaling uses;

Sending module is used for up feedback signaling is carried on the resource of sequence number correspondence of the resource that up feedback signaling uses that calculates and sends.

The UE of up feedback signaling resource allocation comprises: receiver module, the number information of the descending carrier that the original position of the employed resource of descending control signaling that is used to receive and this UE are shared in a kind of LTE-A system;

Computing module is used for calculating according to the number information of the shared descending carrier of the original position of the employed resource of descending control signaling that receives and this UE the sequence number of resource that up feedback signaling uses;

Sending module is used for up feedback signaling is carried on the resource of sequence number correspondence of the resource that up feedback signaling uses that calculates and sends.

As seen from the above technical solutions, the solution of the present invention is in the LTE-A system, obtain the number information of self current shared descending carrier by terminal equipment, and reception descending control signaling, obtain the original position of the employed resource of one's own descending control signaling, calculate the sequence number of resource that up feedback signaling uses thus.Thereby realized that effectively reasonably up signaling being carried out band resource in the LTE-A system distributes, avoided terminal equipment that resource contention takes place when sending up signaling.

Description of drawings

Fig. 1 is a LTE-A single-frequency spectral system schematic;

Fig. 2 is a LTE-A spectrum aggregating system schematic;

Fig. 3 is a FDD band system band resource allocation schematic diagram among the LTE-A;

Fig. 4 is a TDD band system band resource allocation schematic diagram among the LTE-A;

Fig. 5 counts the sequence number flow chart that capable feedback signal is used resource in for LTE-A falls into a trap;

Fig. 6 is a UE structural representation among the LTE-A;

Fig. 7 is the descending control signaling schematic diagram of UE on each this carrier wave of carrier wave independent bearing among the LTE-A;

Fig. 8 is for having only the descending control signaling schematic diagram of all UE of carrying on the carrier wave among the LTE-A;

Fig. 9 carries the descending control signaling schematic diagram of all UE jointly for each carrier wave among the LTE-A.

Embodiment

For make purpose of the present invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.

In the LTE-A system, existence is with the same situation of LTE, be that descending control signaling when transmission carried out in the base station, can distribute exclusive physical resource for each UE, but for up feedback signaling, each UE can't be known the employed resource situation of other UE, and the resource collision takes place when avoiding each UE to feed back, and sets each UE and calculates its up feedback signaling according to the resource original position of its descending control signaling that receives and transmit employed resource number.In the LTE-A system, there is the configuration of a plurality of descending carriers, for using single carrier to carry out the UE that uplink maybe can only be supported a small amount of up-link carrier, then have the inconsistent situation of this up-downgoing number of carriers, this moment the uplink feedback information on a plurality of descending carriers will be in a up-link carrier multiplexing transmission.On the one hand, may exist a plurality of independently down control channels to control downlink transfer on the different carrier respectively in the LTE-A system, also may control all downlink transfer by a public down control channel; In addition, also can take a plurality of carrier waves simultaneously for some user who carries out big data quantity transmission and carry out downlink transfer, then a user may need the information on a plurality of descending carriers of feedback in a up-link carrier simultaneously.Like this, if will calculate the sequence number of resource that up feedback signaling uses, only know the initial address n of descending control signaling _DLBe not enough, also will know the carrier number L of the residing carrier wave of the pairing downlink data of this up feedback signaling, have only initial address n descending control signaling _DLWith the carrier number L of the residing carrier wave of downlink data combine could and the sequence number n of resource that up feedback signaling uses _ULForm one-to-one relationship, represent to be with mathematical form: n _UL=F (n _DL, L).Therefore, the present invention calculates up feedback signaling resource number n _ULThe time will be by the employed resource of descending control signaling original position n _DLRealize with two independents variable of carrier number L of the residing carrier wave of downlink data.

Be control signaling and the carrying situation of data on descending carrier of being controlled among the LTE-A below, be divided into following three kinds of situations:

A kind of is that independently descending control signaling is all arranged on each descending carrier, and promptly the descending control signaling of UE and downlink data transmit on same carrier wave, and then this moment, each descending carrier all can be considered independently LTE version 8 systems, as shown in Figure 7; A kind of is to have only in the system on the descending carrier to have descending control signaling, be that UE on each carrier wave controls by the descending control signaling on the descending carrier, wherein descending control signaling both can be separate, also can be mixed distribution, as shown in Figure 8; At last a kind of is the descending control signaling that each descending carrier carries all UE jointly in the system, and promptly the descending control signaling of UE and downlink data may not transmit on a carrier wave, as shown in Figure 9.According to above-mentioned three kinds of cited situations, there are following two kinds of up feedback signaling resource distribution modes.

So, core concept of the present invention is specially following steps, as shown in Figure 5:

Step 501, UE obtain self current shared descending carrier number information;

Step 502, UE receive descending control signaling, and obtain the original position of the resource that descending control signaling uses that belongs to himself;

In this step, the current shared descending carrier number information of UE self can be obtained from the base station by broadcast signaling, and at this moment, the base station can be according to current system status, it is current shared that descending carrier is numbered that statistics obtains each UE, and send to UE by broadcast signaling;

Step 503, go out the sequence number of resource that up feedback signaling uses by the information calculations of being obtained in step 1 and the step 2.

The structure of UE provided by the invention comprises as shown in Figure 6: sending module, and receiver module and computing module, wherein,

Receiver module, the number information of the descending carrier that the original position of the employed resource of descending control signaling that is used to receive and this UE are shared;

Computing module is used for calculating the employed resource number of up feedback signaling according to the number information of the shared descending carrier of the original position of the employed resource of descending control signaling that receives and this UE;

Sending module is used for up feedback signaling is carried on the resource of the employed resource number correspondence of up feedback signaling that calculates and sends.

The present invention also provide a kind of in the LTE-A system up feedback signaling resource distributor system, comprise base station and UE, wherein,

The base station is used to send the number information of the shared descending carrier of the original position of the employed resource of descending control signaling and each UE;

UE, be used for calculating the employed resource number of up feedback signaling, up feedback signaling be carried on the resource of the employed resource number correspondence of up feedback signaling that calculates and send according to the original position of the employed resource of descending control signaling that receives and the number information of self current shared descending carrier.

Below, foregoing invention thought is further specialized:

In the LTE-A system, there is the up feedback signaling of a plurality of not same-actions, for example, channel quality indication (CQI), pre-coding matrix indication (PMI), channel sequence indication (RI) and being used for mixes the ACK/NACK signaling of automatic re-transmission (HARQ) etc.Below, be that example specifically describes up feedback resource distribution method in the LTE-A system with ACK/NACK.

In the LTE-A system, when having opened the HARQ function in the descending transmission, whether UE will need the signaling that retransmits to base station feedback after finishing downlink data and receiving, i.e. ACK/NACK, and wherein ACK do not need to represent to retransmit, and NACK need to represent to retransmit.Owing in the LTE-A system, there are a plurality of descending carriers, exist control signaling on the descending carrier might control situations such as data on a plurality of descending carriers, UE carries out ACK/NACK and feeds back employed resource n at this moment _ULNot only with the original position n of the employed resource of descending control signaling _DLRelevant, but also relevant with the carrier number L of the shared descending carrier of this UE, could guarantee that like this ACK/NACK feeds back the uniqueness of the sequence number of shared resource, and then guarantee when a plurality of UE send ACK/NACK, not clash.

Three kinds of situations that control signaling and its data of controlling are carried have been mentioned in the LTE-A system in the front on descending carrier, below, enumerate two specific embodiments in different carriers carry modes:

Embodiment one

Independently descending control signaling is all arranged on each descending carrier, the descending control signaling and the downlink data that are UE transmit on same carrier wave, then this moment, each descending carrier all can be considered independently LTE version 8 systems, and can adopt following scheme to uplink ACK/NACK Resources allocation this moment.

In the LTE system,,, ACK/NACK can carry out following calculating so feeding back the sequence number of shared resource because the provisional capital has only a carrier wave up and down:

n _UL＝f(n _DL)+N′ (1)

Wherein N ' is high-rise configuration parameter, the shared resource area original position of expression feedback information, but owing in the LTE-A system, need to introduce carrier number L, so need make an amendment to formula (1), promptly on the basis of formula (1), introduce carrier number L, can realize in the following way:

UE need be known the quantity t (l) of the shared resource of pairing ACK/NACK feedback signaling on each descending carrier, l=1,2 by broadcast signaling, ..., N, N descending carrier quantity, then in carrying out the LTE-A system, during the resource of the using calculating of uplink ACK/NACK feedback institute, formula (1) is changed into:

$n_{\mathrm{UL}}=f\left(n_{\mathrm{DL}}\right)+\underset{l=1}{\overset{L-1}{\mathrm{\Σ}}}t\left(l\right)---\left(2\right)$

In formula (2), what t (l) referred to is the quantity that pairing ACK/NACK feeds back shared resource on l the descending carrier, then

Feed back the quantity of shared resource with regard to all ACK/NACK on preceding L-1 the descending carrier of expression.Like this, in formula (2), just introduced carrier number L.

In addition, if UE knows by broadcast signaling is the original position s (l) of the shared resource area of ACK/NACK on each descending carrier, l=1,2 ..., N, then in carrying out the LTE-A system, during the resource of the using calculating of uplink ACK/NACK feedback institute, formula (1) is changed into:

n _UL＝f(n _DL)+s(L) (3)

In formula (3), s (L) refers to the original position of the ACK/NACK feedback resource area of using on L the carrier wave.

Embodiment two:

When on having only a descending carrier in the system, having descending control signaling, be that UE on each carrier wave controls by the control signaling on the carrier wave or when each carrier wave carries the descending control signaling of all UE jointly in the system, the descending control signaling and the downlink data that are UE may not transmit on a carrier wave, both of these case can use with a kind of scheme each uplink ACK/NACK feedback information Resources allocation, and concrete scheme is as follows:

In this scheme, be the improvement on uplink ACK in the LTE system/NACK Resource Allocation Formula equally, at first, UE can be known the quantity t (l) of the feedback of ACK/NACK on each descending carrier resource of using, l=1,2 by broadcast signaling, ..., N then during the resource of the using calculating of uplink ACK/NACK feedback institute, changes formula (1) in carrying out the LTE-A system:

$n_{\mathrm{UL}}=\left(f\left(n_{\mathrm{DL}}\right)\mathrm{mod}t\left(L\right)\right)+\underset{l=1}{\overset{L-1}{\mathrm{\Σ}}}t\left(l\right)---\left(4\right)$

In formula (4), (f (n _DL) modt (L)) represent that t (L) removes f (n _DL) complementation.What t (L) referred to is the quantity of L the pairing ACK/NACK feedback of the descending carrier resource of using, then

The quantity of just representing the shared resource of all ACK/NACK feedback signalings on preceding L-1 the descending carrier.

In addition, if UE knows by broadcast signaling is the original position s (l) of the ACK/NACK feedback resource area of using on each descending carrier, l=1,2 ..., N, then in carrying out the LTE-A system, during the resource of the using calculating of uplink ACK/NACK feedback institute, formula (1) is changed into:

n _UL＝(f(n _DL)mod(s(L)-s(L-1)))+s(L) (5)

In formula (5), s (0)=0 o'clock.

Above-mentioned two embodiment are that the uplink ACK/NACK that designs according to the different existing way of descending carrier signaling on carrier wave in the LTE-A system feeds back the Resource Allocation Formula that uses, except above-mentioned resource distribution mode, can also have other mapping function to carry out resource allocation, but all need satisfy following three conditions: (1) does not introduce other independents variable; (2) satisfy one-to-one relationship, promptly by different n _DLMapping obtains different n with L _UL(3) n _ULThe value space be continuous positive integer.

In the LTE-A system, there are a lot of up signalings, but all can be considered with uplink ACK/NACK similarly be the up feedback signaling of certain descending control signaling, therefore, when carrying out the resource allocation of other up signaling, can use the same Resource Allocation Formula, just will calculate according to corresponding descending control signaling with up ACK/NACK.

As can be seen from the above embodiments: the solution of the present invention is in the LTE-A system, receive descending control signaling by UE, and obtain the information of the original position of the employed physical resource of descending control signaling and the shared resource of the pairing up feedback signaling of the control signaling on each descending carrier and calculate the employed resource number of up feedback signaling thus.Thereby realized effectively in the LTE-A system, reasonably up feedback signaling being carried out resource allocation, avoided UE that resource contention takes place when sending up feedback signaling.

In a word; the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, and is within the spirit and principles in the present invention all; any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. up feedback signaling resource allocation methods in the LTE-A system is characterized in that:

A, terminal equipment obtain the number information of self current shared descending carrier;

B, terminal equipment receive descending control signaling, and obtain the original position of the employed resource of one's own descending control signaling;

C, go out the sequence number of resource that up feedback signaling uses by the information calculations of obtaining among steps A and the step B.

2. the method for claim 1 is characterized in that: terminal equipment obtains the number information of self current shared descending carrier in the steps A by broadcast signaling.

3. the method for claim 1 is characterized in that: the sequence number of calculating resource that up feedback signaling uses described in the step C is expressed as with mathematical form: n _UL=F (n _DL, L), n wherein _ULThe sequence number of representing resource that up feedback signaling uses, n _DLThe original position of expression descending control signaling employed resource, L represents the number information of the carrier number of the current shared descending carrier of terminal equipment self.

4. as claim 1 or 3 described methods, it is characterized in that: the sequence number that step C is described to calculate resource that up feedback signaling uses satisfies: the sequence number of the employed resource of up feedback signaling that the number information of the current shared descending carrier of the original position of an employed resource of descending control signaling and terminal equipment is corresponding unique.

5. as claim 1 or 3 described methods, it is characterized in that: the method for the sequence number of described calculating resource that up feedback signaling uses comprises: the number information of introducing descending carrier on the basis of the sequence number method of LTE system-computed resource that up feedback signaling uses is calculated.

6. as claim 1 or 3 described methods, it is characterized in that: the value space of the sequence number of resource that described up feedback signaling uses is continuous positive integer.

7. up feedback signaling resource distributor system in the LTE-A system is characterized in that, comprising: comprise base station and UE, wherein,

The base station is used to send the number information of the shared descending carrier of descending control signaling and each UE;

UE, be used for calculating the sequence number of resource that up feedback signaling uses, up feedback signaling be carried on the resource of sequence number correspondence of the resource that up feedback signaling uses that calculates and send according to the number information of the original position of the employed resource of descending control signaling that receives and self current shared descending carrier.

8. system as claimed in claim 7 is characterized in that, described UE comprises: receiver module, the number information of the descending carrier that the original position of the employed resource of descending control signaling that is used to receive and this UE are shared;

Computing module is used for obtaining according to the information calculations of the shared resource of the pairing up feedback signaling of descending control signaling on each descending carrier of number information of the shared descending carrier of the original position of the employed resource of descending control signaling that receives and this UE the sequence number of resource that up feedback signaling uses;

Sending module is used for up feedback signaling is carried on the resource of sequence number correspondence of the resource that up feedback signaling uses that calculates and sends.

9. the UE of up feedback signaling resource allocation in the LTE-A system is characterized in that this UE comprises: receiver module, the number information of the descending carrier that the original position of the employed resource of descending control signaling that is used to receive and this UE are shared;

Computing module is used for calculating according to the number information of the shared descending carrier of the original position of the employed resource of descending control signaling that receives and this UE the sequence number of resource that up feedback signaling uses;

Sending module is used for up feedback signaling is carried on the resource of sequence number correspondence of the resource that up feedback signaling uses that calculates and sends.

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