CN101431364B - TDD system and its data transmission method - Google Patents
TDD system and its data transmission method Download PDFInfo
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Abstract
The invention discloses a method for transmitting data of a time division duplex system. The method comprises the following steps: at least a special area configuration is set respectively and correspondingly against an incompatible TD-SCDMA system and a compatible TD-SCDMA system in advance; the special area configuration comprises lengths of a protective gap GP time slot, a DwPTS time slot and a UpPTS time slot with a symbol length as a unit; a base station determines all special area configurations in the corresponding set according to that, at present, whether a compatible TD-SCDMA systemis required or not; and one of all the special area configurations is selected according to current coverage range and system performance requirement, and the selected special area configuration is transmitted to user equipment; the user equipment and the base station construct a wireless frame field for data transmission according to the selected special area configuration. The invention also discloses a time division duplex system. With the adoption of the invention, different rate coverage with finer granularity can be supported, wireless resources are saved, and transmission efficiency isimproved.
Description
Technical field
The present invention relates to the Long Term Evolution scheme of tdd systems, particularly a kind of tdd systems and data transmission method thereof.
Background technology
3-G (Generation Three mobile communication system) (3G) adopts the CDMA multi-access mode, supports multimedia service, has higher competitiveness.In order to ensure in the longer time, keeping this competitiveness, 3GPP has started Long Term Evolution (Long Term Evolution, the LTE) research project of 3G wireless interface technology.
At present, the LTE system confirms to support 2 kinds of frame structures.TD-SCDMA is the standard of unique employing time division duplex (TDD) mode in three kinds of big international standards of 3-G (Generation Three mobile communication system); In the Long Term Evolution scheme (LTE TDD) of TD-SCDMA; Its first-selected frame structure is second type of frame structure with the TD-SCDMA system compatible, and is as shown in Figure 1.Wherein, the frame length of a radio frames is 10ms, comprises the field of two 5ms.Each field (is labeled as TS0～TS6) and 3 special time slots (descending pilot frequency time slot (DwPTS time slot), protection is time slot (GP time slot) and uplink pilot time slot (UpPTS time slot) at interval) composition by 7 conventional time slots.Every subframe definition is a business time-slot.Wherein, subframe 0 always is used for downlink transfer with descending pilot frequency time slot, and uplink pilot time slot and subframe 1 always are used for uplink.
LTE TDD system is based on the OFDM technology, and its subcarrier spacing is set at 15kHz, and corresponding OFDM symbol lengths is 66.67us, for separating timing realization OFDM symbol regularly, before each OFDM symbol, adds cyclic prefix CP.When supporting that unicast service and little covering are used, use the short CP of length as 4.76us, the complete OFDM symbol lengths that forms like this is 66.67us+4.76us ≈ 71.4us; When supporting that many cell broadcaste services are used with big covering, use the long CP of length as 16.66us, the complete OFDM symbol lengths that forms like this is 66.67us+16.66us ≈ 88.3us.
For the TDD system, for avoiding the interference between uplink and downlink timeslot, the switching point of its descending time slot to up time slot needs protection (GP) at interval, therefore as previously mentioned, in the wireless frame structure of LTE TDD system, has protection time slot at interval in the special time slot at present.The duration of concrete GP equals the time that electromagnetic wave propagation radius of society twice is experienced, i.e. T
Gp=2*R
Cell/ C, wherein R
CellBe radius of society, C representes the light velocity (3*10
8M/s).
In frame structure shown in Figure 1, the duration of GP is 75us, and its corresponding maximum coverage range is (75us/2) * 3 * 10
8M/s=11.25km.For satisfying support to different coverages; Existing GP can make suitable modification, and specifically the method for designing about GP is: through vacant one or continuous a plurality of ascending time slot corresponding with the coverage of the being supported bigger up protection GP at interval that comes downwards to is provided.At length, generally provide three kinds of GP length to supply the base station to select at present according to the coverage of this sub-district.
One, under the situation of radius of society, use little covering frame structure as shown in Figure 2 to support that corresponding GP duration is 50us less than 7.5km.Insert at random at the UpPTS time slot and carry out this moment.
Two, for radius of society greater than 7.5km and less than the medium covering of 30km; GP length is not enough in second type of frame structure of basic TDD; Through GP and UpPTS are merged the new GP of formation, time span is 191.66us, then just can support the coverage of about 29km.At this moment, insert at random at TS1 or arbitrary thereafter ascending time slot and carry out.Second type of frame structure of TDD supports that the frame structure of medium covering is as shown in Figure 3.
Three, for the big covering scene of radius of society greater than 30km; The method that second type of frame structure of TDD adopts is that whole TS1 is available, and with GP, UpPTS merges; The time span that forms an integral body is the GP of 866.66us, enough supports the above sub-district of 100km to cover.At this moment, insert at random at TS2 and continuous thereafter a plurality of ascending time slots and carry out.The frame structure of second type of big covering of frame structure support of TDD is as shown in Figure 4.
Base station and user preserve above-mentioned three kinds of pairing frame structures of GP length scheme respectively.The base station is according to the coverage of this sub-district, selects a kind of in above-mentioned three kinds of schemes, and notifies the user of this sub-district with the GP length scheme of selecting.When carrying out transfer of data between base station and user afterwards, utilize the corresponding frame structure of corresponding GP length scheme to carry data and communicate.
When adopting aforesaid way to carry out transfer of data, because the adjustment granularity of GP length is an ascending time slot, when supporting that therefore different brackets covers; Differential bigger Deng inter-stage; Support underaction to coverage causes waste of radio resources, reduces efficiency of transmission.For example, be the sub-district of 50km for coverage, need to select the third GP length and corresponding frame structure to carry out transfer of data, time slot was used as protection and slatterned at interval in fact greatly this moment, had in fact also influenced efficiency of transmission.
Summary of the invention
In view of this, the present invention provides a kind of tdd systems and data transmission method thereof, can support more fine-grained different brackets to cover, and save radio resources improves efficiency of transmission.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of data transmission method of tdd systems comprises:
To incompatible and compatible TD-SCDMA system, correspondence is provided with one group of special area configuration that comprises with the symbol lengths protection interval GP time slot, DwPTS time slot and the UpPTS slot length that are unit respectively in advance;
The corresponding one group of special area configuration that is provided with is confirmed according to current whether needs compatible TD-SCDMA system in the base station; And, in said definite one group of special area configuration, select a kind ofly according to current coverage range and systematic function requirement, and the special area configuration of selecting sent to subscriber equipment;
Transfer of data is carried out according to the special area arrangement radio half frame of selecting in subscriber equipment and base station.
Preferably, the conventional structure of time slot of said radio half frame is: comprise in the radio half frame that 8 length are the conventional time slot of 0.5ms, per two conventional time slots are composed of a sub-frame;
When said symbol adopted weak point CP, said to not needing compatible TD-SCDMA system, the corresponding one group of special area that is provided with was configured to:
When said symbol adopted weak point CP, said to not needing compatible TD-SCDMA system, the corresponding a plurality of special areas that are provided with were configured to:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot all is unit with the symbol.
Further carry out when preferably, said correspondence is provided with one group of special area configuration according to the restriction of GP slot length.
Preferably, the conventional structure of time slot of said radio half frame is: comprise in the radio half frame that 8 length are the conventional time slot of 0.5ms, per two conventional time slots are composed of a sub-frame;
Said symbol adopts short CP;
Being restricted to of said GP slot length: the GP slot length can only be 0 or 1 or 2 or 3 or 4 or 5 or 11 or 13 symbol, and said to not needing compatible TD-SCDMA system, the corresponding one group of special area that is provided with is configured to:
Perhaps, being restricted to of said GP slot length: the GP slot length can only be 1 or 2 or 3 or 11 symbol; Said to not needing compatible TD-SCDMA system, the corresponding a plurality of special areas that are provided with are configured to:
Perhaps; Being restricted to of said GP slot length: the GP slot length can only be 1 or 3 or 5 or 11 symbol; Said to not needing compatible TD-SCDMA system, the corresponding a plurality of special areas that are provided with are configured to:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot all is unit with the symbol.
Preferably, the conventional structure of time slot of said radio half frame is: comprise in the radio half frame that 8 length are the conventional time slot of 0.5ms, per two conventional time slots are composed of a sub-frame;
Said symbol adopts long CP;
Said being restricted to the GP slot length: the GP slot length can only be 0 or 1 or 2 or 3 or 4 or 5 or 8 or 11 symbol, and said to not needing compatible TD-SCDMA system, the corresponding a plurality of special areas that are provided with are configured to:
Perhaps, said being restricted to the GP slot length: the GP slot length can only be 1 or 2 or 3 or 11 symbol, and is said to the current compatible TD-SCDMA system that do not need, and the corresponding a plurality of special areas that are provided with are configured to:
Perhaps, said being restricted to the GP slot length: the GP slot length can only be 1 or 2 or 3 or 8 symbol, and is said to the current compatible TD-SCDMA system that do not need, and the corresponding a plurality of special areas that are provided with are configured to:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot all is unit with the symbol.
Preferably, to the situation that needs compatible TD-SCDMA system, correspondence is provided with one group of special area and is configured to: according to the different descending ascending time slot ratio and the different covering requirements of TD-SCDMA system, said special area configuration is set.
Preferably, the TD-SCDMA system that compatible GP slot length is 75us covers the one group of special area that requires under minimum the covering and is configured to:
When adopting weak point CP:
When long CP disposes:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot all is unit with the symbol.
Preferably, said special area configuration is further carried out according to the restriction of GP slot length.
Preferably, when said symbol adopted weak point CP, said GP length restriction is: the GP slot length was 2 or 3 or 4 or 5 or 11 symbols, and said to needing compatible TD-SCDMA system, the corresponding one group of special area that is provided with is configured to:
When said symbol adopted long CP, said GP length restriction is: the GP slot length was 1 or 2 or 3 or 4 or 8 symbol, and said to needing compatible TD-SCDMA system, the corresponding one group of special area that is provided with is configured to:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot all is unit with the symbol.
Preferably, when said symbol adopted short CP, being restricted to of said GP slot length: the GP slot length can only be 2 or 11 symbols, and said to needing compatible TD-SCDMA system, the corresponding one group of special area that is provided with is configured to:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot all is unit with the symbol.
Preferably, when said symbol adopts long CP,
Being restricted to of said GP slot length: the GP slot length can only be 1 or 2 or 8 symbol, and said to needing compatible TD-SCDMA system, the corresponding a plurality of special areas that are provided with are configured to:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot all is unit with the symbol.
Preferably; After correspondence is provided with one group of special area configuration in advance; Further be respectively one group of corresponding special area configuration of compatibility and incompatible TD-SCDMA system numbering is set, and in base station and subscriber equipment, preserve the corresponding relation of said special area configuration and numbering;
Said base station sends to subscriber equipment with the special area configuration of selecting: whether the base station notifying user equipment needs compatible TD-SCDMA system, and the corresponding numbering of selecting of special area configuration is sent to subscriber equipment;
Said subscriber equipment according to the special area arrangement radio half frame of selecting is: the information of subscriber equipment needs compatible TD-SCDMA according to whether; Confirm corresponding a plurality of special area configurations; And according to the numbering that receives; In a plurality of special area configurations of confirming, confirm the special area configuration of base station selected correspondence, and according to this special area arrangement radio half frame.
A kind of tdd systems comprises base station and subscriber equipment,
Said base station is used in advance the compatible TD-CDMA of the needs system to whether, corresponding respectively be provided with one group comprise with the symbol lengths be unit protection at interval the special area of GP time slot, DwPTS time slot and UpPTS slot length dispose; Also be used for according to current whether needs compatible TD-SCDMA system, confirm the corresponding one group of special area configuration that is provided with; And, in said definite one group of special area configuration, select a kind ofly according to coverage and systematic function, and the special area configuration of selecting sent to subscriber equipment; Special area arrangement radio half frame according to selecting is carried out transfer of data;
Said subscriber equipment is used to receive the special area configuration of sending the base station, and carries out transfer of data according to this special area arrangement radio half frame.
Visible by technique scheme, among the present invention, in advance to incompatible and compatible TD-SCDMA system, correspondence is provided with a plurality of special area configurations respectively; Said special area configuration comprises: the length that with the symbol lengths is protection interval GP time slot, DwPTS time slot and the UpPTS time slot of unit; The corresponding a plurality of special areas configurations that are provided with are confirmed according to current whether needs compatible TD-SCDMA system in the base station; And, in said a plurality of special areas configuration, select a kind ofly according to coverage and systematic function, and the special area configuration of selecting sent to subscriber equipment; Transfer of data is carried out according to the special area arrangement radio half frame of selecting in subscriber equipment and base station.After adopting the mode of the invention described above; Because the GP slot length is that unit is provided with the OFDM symbol, and therefore the duration of an OFDM symbol will be much smaller than the duration of the conventional time slot in the frame structure shown in Figure 1; Adjustment granularity for the GP slot length reduces; Thereby can support more fine-grained different brackets to cover, save radio resources improves efficiency of transmission.Simultaneously,,, carried out the setting of different special area configurations respectively, therefore, can under the situation of needs, satisfy compatible requirement with the TD-SCDMA system to whether needing compatible TD-SCDMA system though changed the setting of special area.
Description of drawings
Fig. 1 is the frame structure sketch map of present LTE TDD system.
Fig. 2 is a present LTE TDD system little covering frame structure sketch map.
Fig. 3 is a present LTE TDD system medium covering frame structure sketch map.
Fig. 4 is a present LTE TDD system big covering frame structure sketch map.
Fig. 5 is the data transmission method overview flow chart of tdd systems among the present invention.
Fig. 6 is the overall construction drawing of tdd systems provided by the invention.
Fig. 7 is the wireless frame structure sketch map of LTE TDD system in the embodiment of the invention.
Fig. 8 is the data transmission method particular flow sheet of tdd systems in the embodiment of the invention one.
Fig. 9 is that minimum covers when requiring to adopt weak point CP down in the embodiment of the invention one, GP time slot, DwPTS time slot and UpPTS slot length set-up mode sketch map.
Figure 10 minimumly in the embodiment of the invention one covers when requiring to adopt down long CP GP time slot, DwPTS time slot and UpPTS slot length set-up mode sketch map.
Embodiment
For making the object of the invention, technological means and advantage clearer, the present invention is explained further details below in conjunction with accompanying drawing.
Basic thought of the present invention is: reduce the adjustment granularity of GP slot length, different brackets covers thereby provide more flexibly.
Fig. 5 is the data transmission method overview flow chart of tdd systems among the present invention.As shown in Figure 5, this method comprises:
Special area refers in second type of frame structure among the present invention, three zones that special time slot constitutes in the radio half frame of 5ms.Among the present invention, the GP slot length can be that granularity is adjusted with the OFDM symbol lengths in the special area.
Here; Be that unit is provided with the GP slot length why with the OFDM symbol lengths; Be because the coded modulation scheme that in LTE TDD system, adopts is the OFDM modulation of OFDM modulation or expansion; And the symbol lengths of these two kinds of modulation systems is all identical, is that an OFDM symbol is a unit, is that unit carries out resource allocation with an OFDM symbol therefore.In ensuing literature record, a shared duration of OFDM symbol is called a symbol.
So far, data transmission method flow process provided by the invention finishes.
Fig. 6 is the overall construction drawing of tdd systems provided by the invention.As shown in Figure 6, this system comprises: base station and subscriber equipment.
In this system, the base station is used in advance the system to incompatible and compatible TD-CDMA, corresponding respectively be provided with one group comprise with the symbol lengths be unit protection at interval the special area of GP time slot, DwPTS time slot and UpPTS slot length dispose; Also be used for according to current whether needs compatible TD-SCDMA system, confirm the corresponding one group of special area configuration that is provided with; And, in said definite one group of special area configuration, select a kind ofly according to coverage and systematic function, and the special area configuration of selecting sent to subscriber equipment; Special area arrangement radio half frame according to selecting is carried out transfer of data.
Subscriber equipment is used to receive the special area configuration of sending the base station, and carries out transfer of data according to this special area arrangement radio half frame.
More than be to overview of the present invention, visible by this process, the granularity that is provided with of method GP slot length of the present invention reduces, and different brackets covers thereby can provide more flexibly, improves efficiency of transmission.Simultaneously, to the compatible requirement of TD-SCDMA system, corresponding special area configuration is set respectively, therefore, can satisfy the compatible requirement of LTE TDD system and TD-SCDMA system.But because the flexible adjustment of GP slot length is in the special area scope, to carry out, so GP slot length adjusting range limits by the duration of special area, and just the maximum coverage range supported of this radio half frame is limited by the duration of special area.Preferably, than frame structure shown in Figure 1, the duration of lengthening special area, thus can the modulation range of GP slot length be enlarged, and then enlarge maximum coverage range.Certainly, owing to the length of radio half frame is fixed, so the variation of special area duration can have influence on the duration of other conventional time slots.In the specific embodiment of the present invention below, be example, embodiment of the present invention is described with a kind of new wireless frame structure.
Fig. 7 is a wireless frame structure new in the embodiment of the invention.Wherein, the radio half frame of each 5ms is divided into conventional time slot and 1 special area that length is 1ms that 8 length are 0.5ms, and this special area is by the DwPTS time slot, and GP time slot and UpPTS time slot constitute, and in addition, per two conventional time slots are composed of a sub-frame.With this wireless frame structure is that basic specific embodiments of the invention describes.
Embodiment one:
Fig. 8 is the data transmission method particular flow sheet of tdd systems in the embodiment of the invention one.As shown in Figure 8, this method comprises:
In the practical application, in the base station range of LTE TDD system, possibly there is the TD-SCDMA network,, when GP time slot, DwPTS time slot and UpPTS slot length are set, needs to consider the compatibility of two systems for guaranteeing the signal quality of two networks.Certainly, if there is not the TD-SCDMA network in the base station range of LTETDD system, when carrying out the special area configuration, can not consider that compatibility requires to carry out so.
Based on above-mentioned consideration, in the present embodiment, at first the special area allocation plan is divided into two types of compatible TD-SCDMA system and incompatible TD-SCDMA system configuration.During incompatible TD-SCDMA system, needn't receive compatible constraint, can from aspects such as performance, implementation complexity the special area allocation plan be set fully; And during compatible TD-SCDMA system, can only be under the restriction of compatibility, be provided with according to the descending ascending time slot ratio of the TD-SCDMA system of compatibility.Like this, make following system to select optimum scheme according to whether compatibility requirement being arranged.
Particularly, through following two settings of carrying out two types of special area configurations step by step:
Step 801a, to the situation of incompatible TD-SCDMA system, correspondence is provided with one group of special area configuration, and is configured into line number for special area.
Here, when not having compatibility to require, can wait according to systematic function and scheme complexity and design.Consider the structure and the content of special area shown in Figure 7, when symbol adopted short CP with long CP, the special area configuration of setting was respectively shown in table 1 and table 2.
Table 1
Table 2
When adopting weak point CP, in a plurality of special area allocation plans as shown in table 1, the GP slot length has 14 kinds of selections; Various coverages have been guaranteed; And differential between the coverage of different brackets is the corresponding coverage of a symbol, with respect to the mode in the background technology, differentially reduces greatly.
Simultaneously, can find out that the realization of this scheme is simple by table 1.Particularly; On the one hand, the UpPTS slot length has only 0 symbol and two kinds of situation of 2 symbols, and this is to work as the UpPTS slot length not simultaneously because consider; Concrete UpPTS time slot design possibly compared difficulty; Therefore the for example design of pilot tone and control channel etc. is restricted to two kinds of selections with the UpPTS slot length, designs in the time of only need being 2 symbols to the UpPTS slot length; On the other hand, expand the GP slot length, need not change the designs such as pilot tone of DwPTS through the symbol of destroying a DwPTS Time Slot Occupancy successively.
For identical in the situation that adopts long CP in the table 2 and the table 1, just repeat no more here.
Next, for all the special area allocation plans shown in the above-mentioned table 1 are numbered,, therefore can represent by 4 bits because one have 14 kinds of schemes; For all the special area allocation plans shown in the above-mentioned table 2 are numbered,, therefore also can represent by 4 bits because one have 12 kinds of schemes.The special area allocation plan numbering corresponding with it shown in table 1 and the table 2 is kept in base station and the subscriber equipment.
Step 801b, to the situation of compatible TD-SCDMA system, correspondence is provided with the special area allocation plan, and is configured into line number for special area.
So-called compatibility is meant that in two simultaneous zones of system, the up-downgoing relation of two kinds of systems need be consistent, and promptly up and descending switching point aligns, thereby guarantees not interfere with each other between two systems.Because LTE TDD system is the evolution system of TD-SCDMA system, therefore, generally be the system that in the zone, pre-exists TD-SCDMA, when using the method for the embodiment of the invention, when LTE TDD system wireless frame designs, can with the TD-SCDMA system compatible.
Particularly, the frame structure of describing in the wireless frame structure of TD-SCDMA system and the background technology shown in Figure 2 is identical.Wherein, co-exist in six kinds of uplink and downlink timeslot ratio relations and corresponding up-downgoing switching point position.So-called compatibility with the TD-SCDMA system requires promptly to refer to: the numerical value of the descending ascending time slot ratio of TD-SCDMA system.
Because the GP slot length of TD-SCDMA is 75us; Therefore for guaranteeing compatibility, need to satisfy the condition of two aspects: one, the GP slot length of LTE TDD system can not be that unit calculates with the OFDM symbol less than 75us; When adopting weak point CP; The GP slot length of LTE TDD system is at least two OFDM symbols, and when adopting long CP, the GP slot length of LTE TDD system is at least an OFDM symbol; Proportionate relationship between the shared duration of two, up-downgoing resource will with the TD-SCDMA system in consistent; Consider this point; When GP time slot, DwPTS time slot and UpPTS slot length are provided with in carrying out LTE TDD system; Also need further to carry out according to the structure of conventional time slot, specifically this structure comprises the duration of conventional time slot and with the position relation of special area etc.
The structure of conventional time slot is as shown in Figure 7 in the present embodiment as previously mentioned.Two adjacent conventional time slots are as a sub-frame, two conventional time slots when carrying out resource allocation in one sub-frame or be ascending time slot, or be descending time slot.Descending ascending time slot ratio according to the TD-SCDMA system that confirms; Satisfying above-mentioned compatibility condition (is that the up-downgoing switching point is consistent; GP time slot in the GP time slot covering TD-SCDMA system in the LTE TDD system) under the situation, can obtain all kinds of possible special area allocation plans.Describe for simplifying, minimum to cover the mode that requires (being that the GP slot length is 2 or 1) down to obtain various special area allocation plans be that example describes to satisfy below.
According to the various descending ascending time slot ratio of TD-SCDMA system, when satisfied minimum covering requires,, then can obtain different special area allocation plan shown in Figure 9 if adopt weak point CP, comprise GP time slot, DwPTS time slot and the setting of UpPTS slot length.
In Fig. 9, the signal of the frame structure of the first behavior TD-SCDMA system has wherein marked the switching point position under the different up-downgoing ratios.As, above this frame structure signal, indicating 6: 1 and represent that descending and ratio ascending time slot is 6: 1, the up-downgoing switching point is 6: 1 corresponding vertical dotted line.On behalf of the corresponding LTE TDD system wireless field of different time-gap ratio of TD-SCDMA system, second row respectively situation is set to the 7th row.
Particularly, in the 7th row, be labeled as the expression descending sub frame (two subframes that conventional time slot constitutes) of D at second row, be labeled as the expression sub-frame of uplink of U, dash area is represented special area.Wherein, when adopting weak point CP, special area comprises 14 symbols, below this special area, representes, in this special area, 1 district expression DwPTS time slot can be regarded descending time slot as, 2 districts expression GP time slot, and 3 districts expression UpPTS time slot can be regarded descending time slot as.Visible by Fig. 9, when the descending of TD-SCDMA system and ascending time slot ratio were 6: 1, LTE TDD system can adopt the time slot set-up mode of first row; It is 1 OFDM symbol of GwPTS Time Slot Occupancy; 2 OFDM symbols of GP Time Slot Occupancy, 11 OFDM symbols of UpPTS Time Slot Occupancy, like this; The up-downgoing switching point is consistent in up-downgoing switching point in the LTE TDD system (end of special area) and the TD-SCDMA system, and the GP time slot covers the GP time slot in the TD-SCDMA system simultaneously.Visible by figure, under other time slot ratios, be provided with and also satisfy above-mentioned condition according to mode shown in Figure 9, just detail no longer one by one here.
GP time slot, DwPTS time slot and the setting of UpPTS slot length also can be represented with table 3 in the LTE TDD system wireless field shown in Fig. 9.Wherein, If the descending and ascending time slot ratio of TD-SCDMA system is 1: 6; Then according to the mode of present embodiment, second in the LTE TDD system corresponding diagram 9 gone, and obviously at this moment do not have the conventional time slot of transmitting downlink data; Therefore in practical application, can not adopt this special area configuration, so in table 3, do not comprise this kind situation.
Table 3
Similarly,, when satisfied minimum covering requires,, then can obtain multiple special area configuration shown in Figure 10, specifically comprise GP time slot, DwPTS time slot and UpPTS slot length set-up mode if adopt weak point CP according to compatible requirement.Set-up mode shown in Figure 10 can be represented with table 4.
Table 4
Shown in figure 10; At the compatible TD-SCDMA time slot ratio is 4: 3 o'clock; The scope that first symbol of UpPTS has got into GP time slot in the TD-SCDMA system in the LTE TDD system wireless field, under extreme case, the part of this symbol can receive the interference of the DwPTS of TD-SCDMA system.Have benefited from the CP structure of OFDM fortunately, this interference only influences CP, and therefore, this interference is negligible.
GP length is 1 or 2 symbol lengths in the special area allocation plan in above-mentioned Fig. 9, Figure 10, table 3 and the table 4, its coverage that can support be specially:
When (1) lacking CP, coverage is (2 * 71.4us/2) * 3 * 10
+ 8=21.4km.
(2) during long CP, be that the coverage of 1 symbol is corresponding to the GP slot length: (83.3us/2) * 3 * 10
+ 8=12.5km; Corresponding to the GP slot length is that the coverage of 2 symbols is: (2 * 83.3us/2) * 3 * 10
+ 8=25km.
Above special area allocation plan covers in minimum and draws when requiring.Cover setting based on this minimum, can require adjustment GP slot length, obtain difference and cover the time slot settings under requiring according to covering.Particularly, can be according to the needs of coverage, cover based on this minimum and to be provided with, expansion GP slot length is promptly destroyed adjacent DwPTS time slot of GP time slot or the symbol in the UpPTS time slot or the symbol destroyed simultaneously among both is expanded the GP slot length.
For example, when adopting weak point CP, coverage enlarges one-level, and just making the GP slot length is 3 OFDM symbols, based on the third line in the set-up mode shown in Figure 9 (promptly compatible descending and 5: 2 situation of ascending time slot), two kinds of set-up modes can be arranged so:
One, with the OFDM symbol on the GP time slot left side also as the GP time slot, thereby make 3 symbols of GP Time Slot Occupancy, at this moment, 5 symbols of DwPTS Time Slot Occupancy, 6 symbols of UpPTS Time Slot Occupancy;
Two, with the symbol on GP time slot the right also as the GP time slot, thereby make 3 symbols of GP Time Slot Occupancy, at this moment, 6 symbols of DwPTS Time Slot Occupancy, 5 symbols of UpPTS Time Slot Occupancy.
By that analogy, can obtain a lot of concrete special area allocation plans.If the DwPTS time slot configuration is minimum length 80.57us, the UpPTS time slot configuration is minimum length 141.66us (establishing GT is 8.33us) simultaneously, and this moment, corresponding GP slot length was about 777.8us, supported the most approximately coverage of 116km.Corresponding special big covering demand also can be placed on special area ascending time slot afterwards with PRACH and realize, further enlarges the GP scope.
In the present embodiment, based on the consideration of GP protection gap size and scheme implementation complexity, when adopting short CP and long CP, the special area configuration of compatible TD-SCDMA system is respectively shown in table 5 and table 6.
Table 5
Table 6
With table 5 is the content in this table of example explanation.The compatible requirement of the first line display TD-SCDMA system, being divided into is four types, descending and ascending time slot ratio is 4: 3 respectively; 6: 1 or 3: 4; 5: 2,2: 5, the special area allocation plan that requires to this compatibility was shown in the corresponding tabulation of each compatible requirement.Wherein, because the GP slot length is unified in left column and representes, therefore 4: 3 places are listed as the length of having just listed out DwPTS time slot and UpPTS time slot in the slot length plan of establishment that marks.
As implied above, under the situation to compatible TD-SCDMA system, special area configuration completion is set, be respectively the table of corresponding short CP and long CP.Next, for all the special area allocation plans shown in the above-mentioned table 5 are numbered,, therefore can represent by 4 bits because one have 14 kinds of schemes; For all the special area allocation plans shown in the above-mentioned table 6 are numbered,, therefore also can represent by 4 bits because one have 13 kinds of schemes.The special area allocation plan numbering corresponding with it shown in table 5 and the table 6 is kept in base station and the subscriber equipment.
Certainly, above-mentioned table 5 and table 6 are a kind of exemplary settings in the present embodiment, certainly, also can other allocation plan be set according to compatible requirement.
The operation of above-mentioned steps 801a and 801b can executed in parallel.
As previously mentioned, in the step 801, under the situation that does not need compatible TD-SCDMA system, the corresponding special area allocation plan that is provided with is shown in table 1 and table 2.Therefore, base station and subscriber equipment confirm in this step that then table 1 is said all special area allocation plans that are provided with in advance if adopt short CP; Base station and subscriber equipment confirm in this step that then table 2 is said all special area allocation plans that are provided with in advance if adopt long CP.
Step 804 need to be confirmed under the situation of compatible TD-SCDMA system, the one group of special area allocation plan that is provided with in advance, and execution in step 805.
As previously mentioned, in the step 801, needing under the situation of compatible TD-SCDMA system, the corresponding special area allocation plan that is provided with is shown in table 5 and table 6.Therefore, base station and subscriber equipment confirm in this step that then table 5 is said all special area allocation plans that are provided with in advance if adopt short CP; Base station and subscriber equipment confirm in this step that then table 6 is said all special area allocation plans that are provided with in advance if adopt long CP.
Step 805 according to current coverage range and systematic function requirement, is selected a kind of in all special area configurations of in step 803 or 804, confirming.
In this step, according to coverage, can confirm the minimum length of GP time slot, concrete mode is: calculate the required up switching GP length T that comes downwards to according to coverage
Gp=2*R
Cell/ C, the minimum length of GP time slot is set to take N symbol, and the GP length that calculates is less than the duration of N symbol, greater than the duration of N-1 symbol.
Next; Select a kind of according to the minimum length of this GP time slot in all special area configurations of in step 803 or 804, confirming; If being arranged, a plurality of configurations all satisfy the minimum requirement of this GP slot length; Then can be further according to the systematic function requirement, as above business need of downlink data transmission etc. is selected.
In this step, in this step, the base station can be through the mode of high-level signaling, and for example broadcast channel etc. sends to subscriber equipment with the special area configuration of selecting.
Whether the base station with the mode that the special area configuration of selecting sends to subscriber equipment is: will need the information of compatible TD-SCDMA system to send to subscriber equipment on the one hand, and on the other hand, the corresponding numbering of selecting of special area configuration sent to subscriber equipment.
Particularly, can utilize 1bit to represent whether need compatible TD-SCDMA system, for example, this bit is changed to 1 expression needs compatibility, and this bit is changed to 0 expression does not need compatibility; When numbering is sent to subscriber equipment, visible according to the numbering that is provided with among abovementioned steps 801a and the 801b, for compatible and incompatible situation, all can utilize 4 bit transfer number information.The information of comprehensive above-mentioned two aspects can adopt 5 bits that the special area configuration of selecting is sent to subscriber equipment altogether.
In this step, subscriber equipment is confirmed still to search the special area configuration in table 5, the table 6 at preservation table 1, table 2 according to the information of the whether needs compatible TD-SCDMA system that send the base station.Particularly, when showing, the information of receiving then in table 1 and table 2, searches when not needing compatibility; When the information of receiving shows that needs are compatible, then in table 5 and table 6, search.
Be that short CP or long CP confirm the concrete look-up table that adopts further according to current employing.
Next, in the final look-up table of confirming, search corresponding special area allocation plan according to the numbering that receives, and utilize this special area arrangement radio half frame and base station to carry out transfer of data.
So far, the method flow in the embodiment of the invention one finishes.
In the foregoing description one, obtain one group of special area configuration shown in table 1 and the table 2 to the situation of incompatible TD-SCDMA system; Situation to compatible TD-SCDMA system obtains one group of special area configuration shown in table 5 and the table 6.Include tens kinds of schemes in these two groups of special area configurations, need utilize the numbering of 4 bit informations transmission special area configuration.
For further reducing the scheme number of every group of kind special area configuration; Save the required bit number of transmission numbering;, can also further limit the GP slot length, thereby reduce the scheme quantity of total special area configuration when carrying out being provided with of special area configuration above-mentioned through step 801a and 801b.
Particularly, be directed to table 1 and the table 2 set up among the step 801a, can further limit the GP slot length, for example, when adopting weak point CP; To table 1, can limit the GP slot length is 0,1,2,3; 4,5,11 or 13 symbols obtain the special area configuration shown in the table 7:
Table 7
When the special area configuration adopted shown in the table 7, totally 8 kinds of schemes, the numbering of special area configuration only needs 3 bits to represent.
Perhaps, can be 1,2,3 or 11 symbols also to table 1 restriction GP slot length, obtain the special area configuration shown in the table 8:
Table 8
When the special area configuration adopted shown in the table 8, totally 4 kinds of schemes, the numbering of special area configuration only needs 2 bits to represent.
Perhaps, can be 1,3,5 or 11 symbols also to table 1 restriction GP slot length, obtain the special area configuration shown in the table 9:
Table 9
When the special area configuration adopted shown in the table 9, totally 4 kinds of schemes, the numbering of special area configuration only needs 2 bits to represent.
When adopting long CP, to table 2, can limit the GP slot length is 0,1,2,3, and 4,5,8 or 11 symbols obtain the special area configuration shown in the table 10:
Table 10
When the special area configuration adopted shown in the table 10, totally 8 kinds of schemes, the numbering of special area configuration only needs 3 bits to represent.
Perhaps, can be 1,2,3 or 11 symbols also to table 2 restriction GP slot length, obtain the special area configuration shown in the table 11:
Table 11
When the special area configuration adopted shown in the table 11, totally 4 kinds of schemes, the numbering of special area configuration only needs 2 bits to represent.
Perhaps, can be 1,2,3 or 8 symbols also to table 2 restriction GP slot length, obtain the special area configuration shown in the table 11:
Table 12
When the special area configuration adopted shown in the table 12, totally 4 kinds of schemes, the numbering of special area configuration only needs 2 bits to represent.
Be directed to table 5 and the table 6 set up among the step 801b, also can further limit the GP slot length, for example, when adopting weak point CP, to table 5, can limit the GP slot length is 2 or 11 symbols, obtains the special area configuration shown in the table 13:
Table 13
When the special area configuration adopted shown in the table 13, totally 5 kinds of schemes, the numbering of special area configuration only needs 3 bits to represent.
Perhaps, can be minimum also to table 5 restriction GP slot length, obtain the special area configuration shown in the table 14:
Table 14
In fact, the configuration of table 14 is the configuration of table 3 when adopting short CP under the aforementioned smallest coverage, when adopting this special area configuration, and totally 4 kinds of schemes, the numbering of special area configuration only needs 2 bits to represent.
When adopting long CP, to table 6, can limit the GP slot length is 1 or 2 or 8 symbol, obtains the special area configuration shown in the table 15:
Table 15
When the special area configuration adopted shown in the table 15, totally 5 kinds of schemes, the numbering of special area configuration only needs 3 bits to represent.
Perhaps, can be minimum also to table 6 restriction GP slot length, obtain the special area configuration shown in the table 16:
Table 16
In fact, the configuration of table 16 is the configuration of table 4 when adopting long CP under the aforementioned smallest coverage, when adopting this special area configuration, and totally 4 kinds of schemes, the numbering of special area configuration only need be represented by 2 bits.
As above; Can limit the GP slot length according to the systematic function needs arbitrarily; Thereby simplify the possibility quantity that special area disposes, further reduce the required bit number of transmission number information, limit the GP slot length certainly and mean that then increasing the difference coverings waits the differential of inter-stage; In any case but, this differential necessarily differential less than in the said scheme of background technology.
In as above scheme, the required bit number of special area numbering is respectively 3 bits or 2 bits, adds whether to transmit 1 bit of compatible information, in the time of can obtaining the selected special area configuration of base station notifying user equipment, needs 4 bits or 3 bits.According to mentioned above principle, can take all factors into consideration the differential demand of coverage and the planning of system resource, carry out step 801 in the setting of optional special area allocation plan.
Method flow among the invention described above embodiment one can be implemented in system shown in Figure 6.
More than being merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. the data transmission method of a tdd systems is characterized in that, this method comprises:
Insert (TD-SCDMA) system to incompatible and compatible Time Division-Synchronous Code Division Multiple Access in advance, respectively correspondence be provided with one group comprise with OFDM (OFDM) symbol lengths be unit protection at interval the special area of (GP) time slot, down-going synchronous (DwPTS) time slot and uplink synchronous (UpPTS) slot length dispose;
The corresponding one group of special area configuration that is provided with is confirmed according to current whether needs compatible TD-SCDMA system in the base station; And, in said definite one group of special area configuration, select a kind ofly according to current coverage range and systematic function requirement, and the special area configuration of selecting sent to subscriber equipment;
Transfer of data is carried out according to the special area arrangement radio half frame of selecting in subscriber equipment and base station;
The conventional structure of time slot of said radio half frame is: comprise in the radio half frame that 8 length are the conventional time slot of 0.5ms, per two conventional time slots are composed of a sub-frame.
2. method according to claim 1 is characterized in that, when said OFDM symbol adopted short Cyclic Prefix (CP), said to not needing compatible TD-SCDMA system, the corresponding one group of special area that is provided with was configured to:
When said OFDM symbol adopted long CP, said to not needing compatible TD-SCDMA system, the corresponding a plurality of special areas that are provided with were configured to:
Wherein, the length in DwPTS time slot, GP time slot and UpPTS crack is unit with the OFDM symbol all.
3. method according to claim 1 is characterized in that, further carries out according to the restriction of GP slot length when said correspondence is provided with one group of special area configuration.
4. method according to claim 3 is characterized in that, said OFDM symbol adopts short CP;
Being restricted to of said GP slot length: the GP slot length can only be 0 or 1 or 2 or 3 or 4 or 5 or 11 or 13 OFDM symbol, and said to not needing compatible TD-SCDMA system, the corresponding one group of special area that is provided with is configured to:
Perhaps, being restricted to of said GP slot length: the GP slot length can only be 1 or 2 or 3 or 11 OFDM symbol; Said to not needing compatible TD-SCDMA system, the corresponding a plurality of special areas that are provided with are configured to:
Perhaps, being restricted to of said GP slot length: the GP slot length can only be 1 or 3 or 5 or 11 OFDM symbol, and said to not needing compatible TD-SCDMA system, the corresponding a plurality of special areas that are provided with are configured to:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot is unit with the OFDM symbol all.
5. method according to claim 3 is characterized in that, said OFDM symbol adopts long CP;
Said being restricted to the GP slot length: the GP slot length can only be 0 or 1 or 2 or 3 or 4 or 5 or 8 or 11 OFDM symbol, and said to not needing compatible TD-SCDMA system, the corresponding a plurality of special areas that are provided with are configured to:
Perhaps, said being restricted to the GP slot length: the GP slot length can only be 1 or 2 or 3 or 11 OFDM symbol, and is said to the current compatible TD-SCDMA system that do not need, and the corresponding a plurality of special areas that are provided with are configured to:
Perhaps, said being restricted to the GP slot length: the GP slot length can only be 1 or 2 or 3 or 8 OFDM symbol, and is said to the current compatible TD-SCDMA system that do not need, and the corresponding a plurality of special areas that are provided with are configured to:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot is unit with the OFDM symbol all.
6. method according to claim 1; It is characterized in that; To the situation that needs compatible TD-SCDMA system, correspondence is provided with one group of special area and is configured to: according to the different descending ascending time slot ratio and the different covering requirements of TD-SCDMA system, said special area configuration is set.
7. method according to claim 6 is characterized in that, the TD-SCDMA system that compatible GP slot length is 75us covers the one group of special area that requires under minimum the covering and is configured to:
When adopting weak point CP:
When long CP disposes:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot is unit with the OFDM symbol all.
8. method according to claim 6 is characterized in that, said special area configuration is further carried out according to the restriction of GP slot length.
9. method according to claim 8 is characterized in that,
When said OFDM symbol adopted weak point CP, said GP length restriction is: the GP slot length was 2 or 3 or 4 or 5 or 11 OFDM symbols, and said to needing compatible TD-SCDMA system, the corresponding one group of special area that is provided with is configured to:
When said OFDM symbol adopted long CP, said GP length restriction is: the GP slot length was 1 or 2 or 3 or 4 or 8 OFDM symbol, and said to needing compatible TD-SCDMA system, the corresponding one group of special area that is provided with is configured to:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot is unit with the OFDM symbol all.
10. method according to claim 8; It is characterized in that when said OFDM symbol adopted short CP, being restricted to of said GP slot length: the GP slot length can only be 2 or 11 OFDM symbols; Said to needing compatible TD-SCDMA system, the corresponding one group of special area that is provided with is configured to:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot is unit with the OFDM symbol all.
11. method according to claim 8 is characterized in that, when said OFDM symbol adopts long CP,
Being restricted to of said GP slot length: the GP slot length can only be 1 or 2 or 8 OFDM symbol, and said to needing compatible TD-SCDMA system, the corresponding a plurality of special areas that are provided with are configured to:
Wherein, the length of DwPTS time slot, GP time slot and UpPTS time slot is unit with the OFDM symbol all.
12. according to arbitrary described method in the claim 1 to 11; It is characterized in that; After correspondence is provided with one group of special area configuration in advance; Further be respectively one group of corresponding special area configuration of compatibility and incompatible TD-SCDMA system numbering is set, and in base station and subscriber equipment, preserve the corresponding relation of said special area configuration and numbering;
Said base station sends to subscriber equipment with the special area configuration of selecting: whether the base station notifying user equipment needs compatible TD-SCDMA system, and the corresponding numbering of selecting of special area configuration is sent to subscriber equipment;
Said subscriber equipment according to the special area arrangement radio half frame of selecting is: the information of subscriber equipment needs compatible TD-SCDMA according to whether; Confirm corresponding a plurality of special area configurations; And according to the numbering that receives; In a plurality of special area configurations of confirming, confirm the special area configuration of base station selected correspondence, and according to this special area arrangement radio half frame.
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| CN2007101771158A CN101431364B (en) | 2007-11-09 | 2007-11-09 | TDD system and its data transmission method |
| EP08846282.5A EP2216915B1 (en) | 2007-11-02 | 2008-10-31 | Time division duplexing data transmission |
| KR1020107012253A KR101093479B1 (en) | 2007-11-02 | 2008-10-31 | Time division duplexing data transmitting method and apparatus |
| US12/741,020 US8457032B2 (en) | 2007-11-02 | 2008-10-31 | Method and apparatus for data transmission in a time division duplexing system |
| PCT/CN2008/072907 WO2009059555A1 (en) | 2007-11-02 | 2008-10-31 | Time division duplexing data transmitting method,apparatus and system |
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| WO1995032558A2 (en) * | 1994-05-24 | 1995-11-30 | Nokia Telecommunications Oy | A method for improving connection quality in a cellular radio system, and a base station |
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