CN101483475A - Method and apparatus for fully utilizing special time slot resource in time division duplex system - Google Patents
Method and apparatus for fully utilizing special time slot resource in time division duplex system Download PDFInfo
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Abstract
The present invention discloses a method for fully using the special time slot resource in time division duplex system, wherein the method comprises the following steps: when the length of DwPTS is one OFDM symbol OS and SW is larger than P-SCH bandwidth, using other parts except for the resource taken by P-SCH in a first OS of DwPTS for loading control signaling according to the length of different downlink pilot time slot DwPTS and system bandwidth SW; and when the length of DwPTS is larger than one OS, mapping the time frequency resource position taken by the downlink pilot of the first OS in common sub-frame structure to the time frequency resource of a second OS in DwPTS, and using other parts except for the resource taken by P-SCH in the first OS of DwPTS for bearing control signaling. The invention simultaneously discloses a device which fully uses the special time slot resource in time division duplex system. The usage factor of special time slot resource in time division duplex system can be increased according to the invention.
Description
Technical field
The present invention relates to mobile communication technology, particularly a kind of method and device that makes full use of special time slot resource in time division duplex (TDD) system.
Background technology
At present, 3-G (Generation Three mobile communication system) (3G) is supported advantages such as multimedia service owing to adopt code division multiple access (CDMA) mode, can have higher competitiveness in several years of future.And in order to keep long-term competitiveness, 3-G (Generation Three mobile communication system) project cooperation plan (3GPP) has started Long Term Evolution (the LTE:Long Term Evolution) research project of 3G wireless interface technology.Wherein, LTE can comprise: reduce time delay, improve user data rate, improve power system capacity and covering, the cost of reduction operator etc.
In the Long Term Evolution of 3G wireless interface technology, adopt two class wireless frame structures as depicted in figs. 1 and 2.Fig. 1 is the first kind frame assumption diagram that LTE supports in the prior art, and as shown in Figure 1, the frame length of radio frames is 10ms, is made up of 20 time slots, every slot length is 0.5ms, and each subframe comprises the time slot of two continuous 0.5ms, and promptly subframe i is made up of time slot 2i and 2i+1, wherein i=0,1 ..., 9.For Frequency Division Duplexing (FDD) (FDD) system, because up-downgoing separates on frequency domain, so every 10ms in the time, 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 has 10 subframes and can use, each subframe or distribute to up or distribute to descending.Wherein, subframe 0 and subframe 5 are always distributed to descending.
Fig. 2 is the second class frame assumption diagram that LTE supports in the prior art.Wherein, this second class frame structure is only applicable to the TDD system, and as shown in Figure 2, wireless frame length is 10ms, and this radio frames is divided into the radio half frame of 2 5ms.Each radio half frame comprises 7 business time-slots (being labeled as 0～6) and 3 special time slots.Each subframe comprises a business time-slot, and subframe is long to be 0.675ms.3 special time slots are respectively descending pilot frequency time slot (DwPTS), and the up-downgoing protection is time slot (GP) and uplink pilot time slot (UpPTS) at interval.Wherein, subframe 0 and DwPTS always distribute to descending, and UpPTS and subframe 1 are always distributed to up.In the second class frame structure, defined the application scenarios of different short Cyclic Prefix (CP) length configuration, the short CP that is about 8.33us such as, length is applicable to the situation of unicast service or little covering, in this case, each subframe comprises 14 OFDM symbols; The long CP that length is about 17.71us is applicable to the broadcasting service of many sub-districts or the situation of big covering, and in this case, each subframe comprises 12 OFDM symbols.
In LTE frame structure optimization work, a kind of Fig. 1 of being different from, frame structure shown in Figure 2 have been proposed.Referring to Fig. 3, Fig. 3 is the new frame assumption diagram that LTE supports in the prior art.Wherein, the new frame structure that this LTE supports is applicable to the TDD system, is also referred to as LTE tdd frame structure usually.As shown in Figure 3, wireless frame length is 10ms, and this radio frames is divided into the radio half frame of 2 5ms.Each radio half frame comprises 4 common subframes and the special time slot that length is 1ms, and each common subframe comprises the time slot of two continuous 0.5ms, and special time slot comprises DwPTS, GP and UpPTS.
In order to keep the flexibility of communication system, perhaps, in order to guarantee the compatibility of LTE tdd frame structure and TD SDMA (TD-SCDMA) system, perhaps in order to satisfy different covering requirements, DwPTS length is variable, adopting under the short CP situation, the OFDM symbolic number (OS:OFDMsymbol) of DwPTS can be got 1 to 10 random length between the OS, and Fig. 4 a is the special time slot structure chart when DwPTS is 1 OS under the short-and-medium CP situation of prior art.Fig. 4 b is the special time slot structure chart when DwPTS is 10 OS under the long CP situation in the prior art.In the DwPTS time slot, first OFDM symbol need dispose to descending primary synchronization channel (P-SCH).P-SCH fixedly takies first OS of DwPTS, and, on frequency domain, the bandwidth of 6 Physical Resource Block (PRB) in the middle of P-SCH takies.
Because DwPTS length is variable, and P-SCH only takies bandwidth less on the DwPTS frequency domain resource, thereby causes other resource free time among the DwPTS.
Summary of the invention
The embodiment of the invention provides a kind of method and device that makes full use of special time slot resource in time division duplex (TDD) system, so that improve the utilance of DwPTS resource.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method that makes full use of special time slot resource in the tdd systems comprises:
Length and system bandwidth SW according to different descending pilot frequency time slot DwPTS, length at DwPTS is 1 OFDM symbol OS, SW is used for bearer control signalling with other parts except P-SCH takies resource among first OS of DwPTS during greater than descending primary synchronization channel P-SCH bandwidth;
In the length of DwPTS during greater than 1 OS, on the running time-frequency resource of the running time-frequency resource location map that the descending pilot frequency of first OS in the general service subframe structure is shared second OS in the DwPTS, other parts except P-SCH takies resource among first OS of DwPTS are used for bearer control signalling.
Preferably, other parts in first OS of DwPTS except P-SCH takies resource further comprise after being used for bearer control signalling:
Running time-frequency resource among the described DwPTS of independent scheduling.
Preferably, if the length of DwPTS is 1 OS, system bandwidth is greater than the P-SCH bandwidth, and other time interval resources except P-SCH takies time interval resource among first OS of DwPTS are used for further comprising before the bearing downlink control signaling:
The running time-frequency resource location map that the descending pilot frequency of first OS in the downlink business structure of time slot pattern of common subframe is shared is in the DwPTS on other running time-frequency resources except P-SCH occupies frequency range;
Describedly other time interval resources except P-SCH takies time interval resource among first OS of DwPTS be used for bearing downlink control signaling comprise:
Other time interval resources except P-SCH takies time interval resource among first OS of DwPTS are used for bearing downlink control signaling and descending pilot frequency.
Preferably, described descending control signaling comprises: PHICH, and/or, the uplink scheduling signaling.
Preferably, this method further comprises: according to length and the system bandwidth of DwPTS, determine the maximum OS number that down control channel PDCCH takies and whether give PCFICH with the time-frequency resource allocating of DwPTS.
Preferably, when the maximum OS number that described DCCH takies is 2 OS, describedly other parts except P-SCH takies resource among first OS of DwPTS be used for bearer control signalling comprise:
In the frequency domain scope that PHICH takies, give descending pilot frequency and PHICH with the corresponding time-frequency resource allocating of second OS among the DwPTS, and/or, with first OS among the DwPTS except P-SCH occupies frequency range other running time-frequency resources and the running time-frequency resource of second OS respectively correspondence distribute to descending pilot frequency and PHICH.
Preferably, if the maximum OS number that described DCCH takies is 3 OS, describedly other parts except P-SCH takies resource among first OS of DwPTS be used for bearer control signalling comprise:
The running time-frequency resource location map that the descending control signaling of preceding two OS or first three OS in the downlink business structure of time slot pattern in the common subframe is shared comprises in the DwPTS on the running time-frequency resource that P-SCH among first OS occupies preceding two OS of other running time-frequency resources outside the frequency range or first three OS;
According to this mapping result, give descending pilot frequency with the time-frequency resource allocating of second OS correspondence among the DwPTS; Give PHICH with comprising preceding two OS or the corresponding time-frequency resource allocating among first three OS that P-SCH among first OS occupies other running time-frequency resources outside the frequency range among the DwPTS; Give PCFICH with the time-frequency resource allocating of second OS correspondence among the DwPTS.
Preferably, this method further comprises: give downlink service data with unappropriated time-frequency resource allocating among the DwPTS.
A kind of device that makes full use of special time slot resource in the tdd systems comprises: acquiring unit and processing unit; Wherein,
Described acquiring unit is used for obtaining at least the length of system bandwidth and DwPTS;
Described processing unit is according to the system bandwidth of acquiring unit acquisition and the length of DwPTS, length at DwPTS is 1 OFDM symbol OS, SW is used for bearer control signalling with other parts except P-SCH takies resource among first OS of DwPTS during greater than descending primary synchronization channel P-SCH bandwidth; In the length of DwPTS during greater than 1 OS, on the running time-frequency resource of the running time-frequency resource location map that the descending pilot frequency of first OS in the general service subframe structure is shared second OS in the DwPTS, other parts except P-SCH takies resource among first OS of DwPTS are used for bearer control signalling.
Preferably, this device further comprises: scheduling unit,
Described scheduling unit is used for the result according to processing unit processes, the running time-frequency resource among the described DwPTS of independent scheduling.
Preferably, described processing unit also is used for the running time-frequency resource location map that the descending pilot frequency of first OS of the downlink business structure of time slot pattern of common subframe is shared other running time-frequency resources except P-SCH occupies frequency range in the DwPTS.
Preferably, this device further comprises: determining unit,
Described determining unit is used for determining the maximum OS number that down control channel PDCCH takies according to the length of DwPTS and system bandwidth, determines whether to transmit PCFICH.
Preferably, described processing unit also is used for giving downlink service data with the unappropriated time-frequency resource allocating of DwPTS.
As can be seen from the above technical solutions, in the method and apparatus that the embodiment of the invention provides, length and system bandwidth according to different descending pilot frequency time slot DwPTS, during greater than the P-SCH bandwidth, other parts except P-SCH takies resource of first OFDM symbol OS of DwPTS are used for bearer control signalling at system bandwidth SW; The length of DwPTS is during greater than an OS, on the running time-frequency resource of the running time-frequency resource location map that the descending pilot frequency of first OS in the structure of general service subframe is shared second OS in the DwPTS; Make that the running time-frequency resource of other except distributing to P-SCH can be fully utilized in DwPTS, and then can avoid only distributing running time-frequency resource to give P-SCH and the running time-frequency resource waste that causes.
Further, determine that according to length and the system bandwidth of DwPTS PDCCH takies symbolic number, determine whether to transmit PCFICH.According to this mapping result, guarantee the running time-frequency resource independently scheduling all the time among the described DwPTS.
Description of drawings
Fig. 1 is the first kind frame assumption diagram that LTE supports in the prior art;
Fig. 2 is the second class frame assumption diagram that LTE supports in the prior art;
Fig. 3 is the new frame assumption diagram that LTE supports in the prior art;
Fig. 4 a is the special time slot structure chart when DwPTS is 1 OS under the short-and-medium CP situation of prior art;
Fig. 4 b is the special time slot structure chart when DwPTS is 10 OS under the long CP situation in the prior art;
Fig. 5 a is the downlink business structure of time slot pattern diagram in the common subframe under the short CP situation;
Fig. 5 b is the downlink business structure of time slot pattern diagram in the common subframe under the long CP situation;
The schematic diagram of the control channel of the DwPTS that Fig. 6 provides for the embodiment of the invention one;
Control channel first schematic diagram of the DwPTS that Fig. 7 a provides for the embodiment of the invention two;
Second schematic diagram of the control channel of the DwPTS that Fig. 7 b provides for the embodiment of the invention two;
The 3rd schematic diagram of the control channel of the DwPTS that Fig. 7 c provides for the embodiment of the invention two;
The schematic diagram of the control channel of the DwPTS that Fig. 8 provides for the embodiment of the invention three;
The structure drawing of device of the control channel of the DwPTS that Fig. 9 provides for the embodiment of the invention.
Embodiment
For making 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.
The embodiment of the invention mainly is length and the system bandwidth according to different descending pilot frequency time slot DwPTS, determines the transmission plan of DwPTS.System bandwidth (SW) if the length of DwPTS is an OS, then is used for bearer control signalling with the part of other except P-SCH takies resource among the DwPTS during greater than the P-SCH bandwidth.The length of DwPTS is during greater than an OS, on the running time-frequency resource of the running time-frequency resource location map that the descending pilot frequency of first OS in the structure of general service subframe is shared second OS in the DwPTS.Length and the system bandwidth OS whether unique definite PDCCH takies according to DwPTS determine whether to transmit PCFICH.According to this mapping result, guarantee the running time-frequency resource independently scheduling all the time among the described DwPTS.And then improve the utilance of resource among the DwPTS.
The embodiment of the invention mainly is based on the downlink business structure of time slot pattern in the common subframe.At the generic downlink subframe, Fig. 5 a is the downlink business structure of time slot pattern diagram in the common subframe under the short CP situation.Shown in Fig. 5 a, from first OS of generic downlink subframe, the partial fixing time-frequency resource allocating among the 1st, 2,5,8,9 and 12 OS is given descending pilot frequency; Other time-frequency resource allocating of preceding 3 OFDM symbols is given physical control channel format indication channel (PCFICH), the automatic request retransmission indicating channel of physical mixed (PHICH) and down control channel (PDCCH), is used for the transmission of descending control signaling.Equally, referring to Fig. 5 b, Fig. 5 b is the downlink business structure of time slot pattern diagram in the common subframe under the long CP situation.Shown in Fig. 5 b, under long CP situation, when the configuration running time-frequency resource is given descending pilot frequency, give descending pilot frequency with the partial fixing time-frequency resource allocating among the 1st, 2,4,7,8 and 10 OS, other time-frequency resource allocating of preceding 3 OFDM symbols is given PCFICH, PHICH and PDCCH, is used for the transmission of descending control signaling.Symbol R0, R1, R2 and R3 represent the descending pilot frequency that different antennae sends respectively in shown in Fig. 5 a and Fig. 5 b, and C represents descending control signaling, and the running time-frequency resource of blank space can be used for transmitting downlink data.
Can in DwPTS, carry out the time-frequency resource allocating of descending pilot frequency and descending control signaling in the embodiment of the invention in the running time-frequency resource of other except P-SCH takies running time-frequency resource, at last, can also be with unappropriated running time-frequency resource transmission downlink service data among the DwPTS.Like this, can guarantee the preceding m of DwPTS, 1≤m≤3 OS Be Controlled signaling always takies, and, when there is business datum in DwPTS, can dispatch by the dispatch of this time slot, keep consistency with the general service time slot.
The embodiment of the invention is determined concrete transmission plan according to length and the system bandwidth of different descending pilot frequency time slot DwPTS.Make full use of to provided by the invention that the method for special time slot resource is described in the tdd systems below by several embodiment.
Embodiment one:
Referring to Fig. 6, the schematic diagram of the control channel of the DwPTS that Fig. 6 provides for the embodiment of the invention one.As shown in Figure 6, the length of DwPTS is 1 OS, and, system bandwidth is greater than the bandwidth of P-SCH, then in DwPTS, except the running time-frequency resource that P-SCH takies, also there are other running time-frequency resources, then utilize the shared running time-frequency resource location map of the descending pilot frequency of first OS in the downlink business structure of time slot pattern in the common subframe and descending control signaling in the DwPTS on other running time-frequency resources except P-SCH occupies frequency range.According to this mapping result, can give descending pilot frequency and the automatic request retransmission indicating channel of physical mixed PHICH with other time-frequency resource allocating of occupying the running time-frequency resource except descending primary synchronization channel P-SCH among the DwPTS; Perhaps, distribute to descending pilot frequency, PHICH and uplink scheduling signaling.
Wherein, PHICH is used to indicate the mixing for uplink to retransmit (HARQ) response message automatically, resource continuous time of its time-frequency and take size and determine according to system configuration and user type by high level, and indicate to the base station by high-level signaling, be handed down to each user terminal (UE) by the base station by broadcast.The distribution of PHICH is carried out after getting access to the duration information of this PHICH and taking size information in the base station.
Such as, if other time-frequency resource allocating among the above-mentioned DwPTS except P-SCH occupies running time-frequency resource are given descending pilot frequency and PHICH, then, can in DwPTS, distribute running time-frequency resource to give PHICH in the running time-frequency resource of other except P-SCH occupies running time-frequency resource according to the resource occupation size information when getting access to the PHICH duration when being 1 OS.Usually PHICH need take four continuous running time-frequency resource unit altogether.
Certainly, if the system bandwidth among the DwPTS also has residue after distributing to PHICH, then can also distribute still unappropriated running time-frequency resource to give the uplink scheduling signaling.
If the system bandwidth among the DwPTS only is the bandwidth of P-SCH, the length of DwPTS is 1 OS, and like this, the running time-frequency resource among the DwPTS only can transmit P-SCH, does not just have remaining running time-frequency resource to transmit descending control command.Thereby this situation does not belong to the scope of the embodiment of the invention.
If the length of DwPTS is greater than 1 OS, then the embodiment of the invention can be determined the maximum OS number that PDCCH takies according to length and the system bandwidth of DwPTS, determines whether to transmit PCFICH, and wherein, the maximum OS number that PDCCH takies can comprise following two kinds of situations:
First kind: limit maximum two OS and be used to distribute to down control channel PDCCH.
Adopt first kind of situation, can clearly know the maximum OS number that PDCCH is shared.
Second kind: limit maximum three OS and be used to distribute to down control channel PDCCH.
Adopt second kind of situation, maximum three OS are used to distribute to down control channel PDCCH, and can comprise: preceding two OS among the DwPTS are used to distribute to PDCCH, perhaps, among the DwPTS first three OS is used to distribute to PDCCH, and this just can not determine the OS number that PDCCH is shared.
In the embodiment of the invention, in the length of DwPTS during greater than 1 OS, if directly adopt the descending time slot tactic pattern of common subframe, obviously because the existence of P-SCH among the 1st OS of DwPTS, the descending pilot frequency that must cause being in the 1st OS is taken by P-SCH, and then can't carry out the transmission of descending pilot frequency, thereby influence the demodulation performance of downlink data, therefore, can't directly adopt the descending time slot tactic pattern of this common subframe, but can this pattern be improved with reference to the descending time slot tactic pattern of this common subframe.Such as, the descending pilot frequency that distributes among the 1st OS in the descending time slot structure of common subframe can be mapped to the 2nd OS among the DwPTS.That is to say, can the frequency domain scope that descending pilot frequency takies in common subframe in, give descending pilot frequency with the 2nd time-frequency resource allocating that OS is shared of DwPTS, the descending pilot frequency after the 3rd OS can carry out according to the descending time slot tactic pattern of common subframe.
Be described at above two kinds of situations below.
Embodiment two:
Referring to Fig. 7 a, the method that makes full use of special time slot resource in the tdd systems first schematic diagram that Fig. 7 a provides for the embodiment of the invention two.In the present embodiment, if the OS number that qualification PDCCH maximum takies is 2 OS, the length of DwPTS is 2 OS, system bandwidth equals the bandwidth of P-SCH, and the method that then makes full use of special time slot resource in the tdd systems can comprise: on the running time-frequency resource of the running time-frequency resource location map that the descending pilot frequency of first symbol in the downlink business structure of time slot pattern in the common subframe is shared second symbol in the DwPTS; On the running time-frequency resource of the running time-frequency resource position correspondence mappings that descending control signaling in the downlink business structure of time slot pattern in the common subframe is shared second OS in the DwPTS.Like this, according to this mapping result, in the frequency domain scope that the automatic request retransmission indicating channel of physical mixed PHICH takies in the generic downlink subframe, can give descending pilot frequency and PHICH with the time-frequency resource allocating of second OS correspondence among the DwPTS, and then make full use of the resource among the DwPTS.
Certainly, if DwPTS in system bandwidth greater than 1.25MHz, referring to Fig. 7 b, the method that makes full use of special time slot resource in the tdd systems second schematic diagram that Fig. 7 b provides for the embodiment of the invention two.Shown in Fig. 7 b, except above-mentioned Fig. 7 a with DwPTS in the time-frequency resource allocating of second OS correspondence give descending pilot frequency and the PHICH, Fig. 7 b also comprises: other running time-frequency resource correspondences except P-SCH occupies frequency range among first OS of DwPTS are distributed to PHICH.
In the present embodiment, if the OS number that qualification PDCCH maximum takies equals 2 OS, the length of DwPTS is greater than 2 OS, when then the system bandwidth in DwPTS equals the P-SCH bandwidth, make full use of then that the method for special time slot resource comprises in the tdd systems: on the running time-frequency resource of the running time-frequency resource location map that the descending pilot frequency of first symbol in the downlink business structure of time slot pattern in the common subframe is shared second symbol in the DwPTS; The running time-frequency resource position correspondence mappings that descending control command in the downlink business structure of time slot pattern in the common subframe is shared is in the DwPTS on second OS running time-frequency resource.Like this, according to this mapping result, the running time-frequency resource correspondence of second OS among the DwPTS can be distributed to descending pilot frequency and PHICH.In addition, the embodiment of the invention can also will be given PDCCH except the time-frequency resource allocating after descending pilot frequency and the shared resource of PHICH among the DwPTS.
Wherein, PDCCH is used for control signalings such as bearing downlink dispatch, uplink scheduling are authorized, power control command.The resource mapping position of PDCCH in descending sub frame is to remove in the preceding individual OFDM symbol of m (m＜=3) in descending pilot frequency, the shared resource of PCFICH, the PHICH Resource Unit afterwards in the subframe 0.According to different load situations, the duration of PDCCH can be 1 OS, 2 OS or 3 OS, and the duration information of this PDCCH can be indicated by PCFICH.Such as, when the duration of PDCCH is 1 OS, can give PDCCH with unappropriated time-frequency resource allocating among the DwPTS, wherein, this running time-frequency resource is corresponding with PDCCH in the generic downlink subframe on frequency domain.
If the system bandwidth among the DwPTS is during greater than the P-SCH bandwidth, referring to Fig. 7 c, the 3rd schematic diagram of the method that makes full use of special time slot resource in the tdd systems that Fig. 7 c provides for the embodiment of the invention two.Shown in Fig. 7 c, except above-mentioned with the downlink business structure of time slot pattern in the common subframe on the running time-frequency resource of the shared running time-frequency resource position correspondence mappings of descending control command second OS in the DwPTS, Fig. 7 c also comprises: in the frequency domain scope that PHICH and PDCCH take, the running time-frequency resource location map that the PHICH of first OS in the downlink business structure of time slot pattern in the common subframe is shared is in first OS of DwPTS on other running time-frequency resources except P-SCH occupies frequency range.Like this, according to this mapping result, with the running time-frequency resource of other running time-frequency resources except P-SCH occupies frequency range and second OS among first OS of DwPTS respectively correspondence distribute to descending pilot frequency and PHICH; PDCCH.Further, the embodiment of the invention can also will be given PDCCH except the time-frequency resource allocating after descending pilot frequency and the shared resource of PHICH among the DwPTS.
As seen, than prior art, present embodiment can transmit the control signaling that indication PDCCH specifically takies the PCFICH correspondence of maximum OS number always, and then the resource that can save DwPTS, for use in other necessary control instructions of transmission.
Certainly, in the present embodiment, the OS number that the down control channel PDCCH maximum of above-mentioned qualification takies also can be other number, specifically can adopt following examples.
Embodiment three:
Referring to Fig. 8, the method schematic diagram that makes full use of special time slot resource in the tdd systems that Fig. 8 provides for the embodiment of the invention three.As shown in Figure 8, in the present embodiment, the OS number that qualification PDCCH maximum takies equals 3 OS,, can comprise during in the length of DwPTS: on the running time-frequency resource of the running time-frequency resource location map that the descending pilot frequency of first OS in the downlink business structure of time slot pattern in the common subframe is shared second symbol in the DwPTS greater than 2 OS; The running time-frequency resource location map that the descending control signaling of preceding two OS or first three OS in the downlink business structure of time slot pattern in the common subframe is shared comprises in the DwPTS on the running time-frequency resource that P-SCH among first OS occupies preceding two OS of other running time-frequency resources outside the frequency range or first three OS; According to this mapping result, give descending pilot frequency with the time-frequency resource allocating of second OS correspondence among the DwPTS; Give PHICH with comprising preceding two OS or the corresponding time-frequency resource allocating among first three OS that P-SCH among first OS occupies other running time-frequency resources outside the frequency range among the DwPTS; Give PCFICH with the time-frequency resource allocating of second OS correspondence among the DwPTS.
Specifically, if the maximum OS number of above-mentioned qualification is 3, in the present embodiment, can be according to the transformat of appointment, running time-frequency resource correspondence on the 1st, 2 among the DwPTS and the 3rd OS is distributed to PHICH, running time-frequency resource correspondence on the 2nd OS among the DwPTS is distributed to PCFICH, and wherein, this running time-frequency resource is corresponding with PHICH, PCFICH in the generic downlink subframe respectively on frequency domain.Further, the embodiment of the invention can also will be given PDCCH except the time-frequency resource allocating after the shared resource of descending pilot frequency, PCFICH and PHICH among the DwPTS.
Wherein, PCFICH carries the information of 2bit, be used for the OS that indicates this DwPTS descending control signaling shared, therefore, the PCFICH with the generic downlink subframe on frequency domain is corresponding for the running time-frequency resource that PCFICH occupies, take four groups of running time-frequency resource unit, every group of running time-frequency resource unit is continuous four running time-frequency resource unit, i.e. totally 16 running time-frequency resource unit.Wherein, the running time-frequency resource unit is 1 OS and 1 unit that subcarrier is formed.
Because the information that PCFICH carries 2bit can be indicated the shared OS of descending control signaling among this DwPTS, like this, present embodiment can be adjusted the control signaling that will transmit according to the OS of PCFICH indication, needn't limit the time interval resource of DwPTS.
When the length of DwPTS was 2 OS, the operation of carrying out when the length of DwPTS is 2 OS among its embodiment and the embodiment two was identical, repeats no more here.
After other parts except P-SCH takies resource were used for bearer control signalling in first OS of DwPTS, the embodiment of the invention can independently be dispatched the running time-frequency resource among the described DwPTS above-mentioned.Do not carry out combined dispatching with last one descending subframe.Preferably, the embodiment of the invention can also be carried out remaining time-frequency resource allocating among the DwPTS transmission of business datum to downlink service data after the time-frequency resource allocating of having carried out P-CSH, descending pilot frequency and descending control signaling.Corresponding dispatch can utilize dispatch command corresponding in this special time slot, and, in DwPTS, to distribute on the running time-frequency resource of descending pilot frequency and descending control signaling, the base station can be carried out the transmission of corresponding downstream pilot tone and descending control signaling respectively.
Wherein, UE can be as follows to the resolving of DwPTS after the radio frames that receives from the base station:
1) in the 2nd OS of DwPTS, from the running time-frequency resource that descending pilot frequency takies, obtains descending pilot frequency.
2) the PHICH duration of indicating according to broadcast or other modes, be informed in the shared OS of PHICH among this DwPTS, and, take resource size information according to the PHICH that indicates in the broadcast, from the running time-frequency resource unit of setting, obtain PHICH, know the ascending HARQ response message by resolving PHICH.
3) in distributing to the running time-frequency resource of PDCCH, obtain PDCCH, and adopt the mode of blind detection to resolve this PDCCH, promptly attempting 4 kinds of PDCCH forms successively resolves, until correctly parsing PDCCH, thereby obtain the descending scheduling signaling, uplink scheduling is authorized, control commands such as power control command, so that UE can resolve and respective handling the data on this DwPTS according to this control command, for example, can resolve the data on the DwPTS according to the descending scheduling signaling, authorize at the sub-frame of uplink of appointment according to uplink scheduling and to send upstream data with the form of appointment, and the uplink transmission power etc. of adjusting UE according to power control command.
4) obtain downlink data in the running time-frequency resource of other from DwPTS, and this downlink data that obtains is carried out demodulation according to the descending scheduling signaling of from PDCCH, obtaining.
The individual symbol of preceding m (m≤3) that the embodiment of the invention can guarantee DwPTS is the Be Controlled channel occupancy always, when there is business datum in DwPTS, and can dispatch by the dispatch of this time slot, keeps consistency with the general service time slot.
The concrete mode of in the spirit and principles in the present invention other is enumerated no longer one by one at this.
Below the device that utilizes special time slot to carry out wireless transmission in the embodiment of the invention is described.
Referring to Fig. 9, Fig. 9 carries out the structure drawing of device of wireless transmission for the special time slot that utilizes that the embodiment of the invention provides.As shown in Figure 9, this device comprises: acquiring unit 901 and processing unit 902.
Wherein, acquiring unit 901 is used for obtaining at least the length of system bandwidth and DwPTS.
Processing unit 902 is used for according to the system bandwidth of acquiring unit 901 acquisitions and the length of DwPTS, length at DwPTS is 1 OFDM symbol OS, SW is used for bearer control signalling with other parts except P-SCH takies resource among first OS of DwPTS during greater than descending primary synchronization channel P-SCH bandwidth; In the length of DwPTS during greater than 1 OS, on the running time-frequency resource of the running time-frequency resource location map that the descending pilot frequency of first OS in the general service subframe structure is shared second OS in the DwPTS, other parts except P-SCH takies resource among first OS of DwPTS are used for bearer control signalling.
This device further comprises: scheduling unit 903.
Processing unit 902 also is used for the running time-frequency resource location map that the descending pilot frequency of first OS of the downlink business structure of time slot pattern of common subframe is shared other running time-frequency resources except P-SCH occupies frequency range in the DwPTS.
This device further comprises: determining unit 904.
Determining unit 904 is used for determining the maximum OS number that down control channel PDCCH takies according to the length of DwPTS and system bandwidth, determines whether to transmit PCFICH.
Processing unit 902 also is used for giving downlink service data with the unappropriated time-frequency resource allocating of DwPTS.
Like this, in the present embodiment, UE obtains descending pilot frequency, descending control signaling and downlink service data that described allocation units distribute when receiving DwPTS, and, utilize described descending pilot frequency that described downlink service data is carried out demodulation according to the indication of described descending control signaling.
As can be seen from the above technical solutions, in the method and apparatus that the embodiment of the invention provides, if the length of descending pilot frequency time slot DwPTS is greater than 1 OFDM symbol OS, on the running time-frequency resource of the running time-frequency resource location map that the descending pilot frequency of first OS in the downlink business structure of time slot pattern of common subframe and descending control signaling is shared second OS in the DwPTS; According to this mapping result, with the running time-frequency resource of second OS among the described DwPTS respectively correspondence distribute to descending pilot frequency and descending control command.Can guarantee the running time-frequency resource independently scheduling all the time among the described DwPTS, make that the running time-frequency resource of other except distributing to P-SCH can be fully utilized in DwPTS, and then can avoid only distributing running time-frequency resource to give P-SCH and the running time-frequency resource waste that causes.
Institute is understood that; the above is a better embodiment of the present invention only, and is not intended to limit the scope of the 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 (13)
1, a kind of method that makes full use of special time slot resource in the tdd systems is characterized in that, this method comprises:
Length and system bandwidth SW according to different descending pilot frequency time slot DwPTS, length at DwPTS is 1 orthogonal frequency division multiplex OFDM symbol OS, SW is used for bearer control signalling and pilot tone with other parts except P-SCH takies resource among first OS of DwPTS during greater than descending primary synchronization channel P-SCH bandwidth;
In the length of DwPTS during greater than 1 OS, on the running time-frequency resource of the running time-frequency resource location map that the descending pilot frequency of first OS in the general service subframe structure is shared second OS in the DwPTS, other parts except P-SCH takies resource among first OS of DwPTS are used for bearer control signalling.
2, the method for claim 1 is characterized in that,, further comprises after other parts except P-SCH takies resource are used for bearer control signalling in first OS of DwPTS described:
Running time-frequency resource among the described DwPTS of independent scheduling.
3, the method for claim 1, it is characterized in that if the length of DwPTS is 1 OS, system bandwidth is greater than the P-SCH bandwidth, other time interval resources except P-SCH takies time interval resource among first OS of DwPTS are used for further comprising before the bearer control signalling:
The running time-frequency resource location map that the descending pilot frequency of first OS in the downlink business structure of time slot pattern of common subframe is shared is in the DwPTS on other running time-frequency resources except P-SCH occupies frequency range;
Describedly other time interval resources except P-SCH takies time interval resource among first OS of DwPTS be used for bearing downlink control signaling comprise:
Other time interval resources except P-SCH takies time interval resource among first OS of DwPTS are used for bearing downlink control signaling and descending pilot frequency.
4, method as claimed in claim 3 is characterized in that, described descending control signaling comprises: the automatic request retransmission indicating channel of physical mixed PHICH, and/or, the uplink scheduling signaling.
5, the method for claim 1, it is characterized in that, this method further comprises: according to length and the system bandwidth of DwPTS, determine the maximum OS number that down control channel PDCCH takies and whether give physical control channel format indication channel PCFICH with the time-frequency resource allocating of DwPTS.
6, as claim 1 or 5 described methods, it is characterized in that, when the maximum OS number that described DCCH takies is 2 OS, describedly other parts except P-SCH takies resource among first OS of DwPTS are used for bearer control signalling comprise:
In the frequency domain scope that PHICH takies, give descending pilot frequency and PHICH with the corresponding time-frequency resource allocating of second OS among the DwPTS, and/or, with first OS among the DwPTS except P-SCH occupies frequency range other running time-frequency resources and the running time-frequency resource of second OS respectively correspondence distribute to descending pilot frequency and PHICH.
7, as claim 1 or 5 described methods, it is characterized in that,, other parts except P-SCH takies resource among first OS of DwPTS be used for bearer control signalling comprise if the maximum OS number that described DCCH takies is 3 OS:
The running time-frequency resource location map that the descending control signaling of preceding two OS or first three OS in the downlink business structure of time slot pattern in the common subframe is shared comprises in the DwPTS on the running time-frequency resource that P-SCH among first OS occupies preceding two OS of other running time-frequency resources outside the frequency range or first three OS;
According to this mapping result, give descending pilot frequency with the time-frequency resource allocating of second OS correspondence among the DwPTS; Give PHICH with comprising preceding two OS or the corresponding time-frequency resource allocating among first three OS that P-SCH among first OS occupies other running time-frequency resources outside the frequency range among the DwPTS; Give PCFICH with the time-frequency resource allocating of second OS correspondence among the DwPTS.
8, the method for claim 1 is characterized in that, this method further comprises: give downlink service data with unappropriated time-frequency resource allocating among the DwPTS.
9, a kind of device that makes full use of special time slot resource in the tdd systems is characterized in that, this device comprises: acquiring unit and processing unit; Wherein,
Described acquiring unit is used for obtaining at least the length of system bandwidth and DwPTS;
Described processing unit is according to the system bandwidth of acquiring unit acquisition and the length of DwPTS, length at DwPTS is 1 OFDM symbol OS, SW is used for bearer control signalling with other parts except P-SCH takies resource among first OS of DwPTS during greater than descending primary synchronization channel P-SCH bandwidth; In the length of DwPTS during greater than 1 OS, on the running time-frequency resource of the running time-frequency resource location map that the descending pilot frequency of first OS in the general service subframe structure is shared second OS in the DwPTS, other parts except P-SCH takies resource among first OS of DwPTS are used for bearer control signalling.
10, device as claimed in claim 9 is characterized in that, this device further comprises: scheduling unit,
Described scheduling unit is used for the result according to processing unit processes, the running time-frequency resource among the described DwPTS of independent scheduling.
11, device as claimed in claim 9, it is characterized in that described processing unit also is used for the running time-frequency resource location map that the descending pilot frequency of first OS of the downlink business structure of time slot pattern of common subframe is shared other running time-frequency resources except P-SCH occupies frequency range in the DwPTS.
12, device as claimed in claim 9 is characterized in that, this device further comprises: determining unit,
Described determining unit is used for determining the maximum OS number that down control channel PDCCH takies according to the length of DwPTS and system bandwidth, and determines whether to transmit PCFICH.
13, device as claimed in claim 9 is characterized in that, described processing unit also is used for giving downlink service data with the unappropriated time-frequency resource allocating of DwPTS.
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