CN101420265A - Data transmission method, system and device in long term evolution system - Google Patents
Data transmission method, system and device in long term evolution system Download PDFInfo
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Abstract
The present invention discloses a data transmitting method for a time division synchronous code division multiple access (TD-SCDMA) long-term evolution system. The method comprises the steps of setting the length value of each service time slot in radio field as integral length values of orthogonal frequency division multiplexing (OFDM) symbol; setting the difference between the length of the radio field and the length of the service time slot as the length of a special time slot; transmitting data by using the radio field. In addition, the present invention discloses a data transmitting system for a time division synchronous code division multiple access (TD-SCDMA) long-term evolution system and a device thereof. According to the technical solution of the present invention, resources can be saved.
Description
Technical field
The present invention relates to Long Term Evolution (LTE) system that Time Division-Synchronous Code Division Multiple Access inserts (TD-SCDMA), relate in particular to data transmission method, system and device in the long evolving system that a kind of Time Division-Synchronous Code Division Multiple Access inserts.
Background technology
Long Term Evolution (Long TermEvolution at 3-G (Generation Three mobile communication system) (3G) wireless interface technology, LTE) support 2 class frame structures in the research project: first kind frame structure, be applicable to Frequency Division Duplexing (FDD) (FDD) and TDD system, frame length is 10ms, by length is that 20 time slots of 0.5ms are formed, and per two continuous time slot are defined as a subframe; The second class frame structure, be only applicable to the TDD system, as shown in Figure 1, frame length also is 10ms, the radio half frame that it is 5ms that each radio frames is divided into 2 length, each field comprise that 7 length are the business time-slot of 0.675ms (slot) and 1 special time slot that length is 0.275ms.Among Fig. 1, the label in 7 real cracks of business is TS0 to TS6, and wherein, first professional real crack TS0 is fixed for downlink transfer, and second real crack TS1 of business is fixed for uplink, and each business time-slot is defined as a subframe.Special time slot comprises descending pilot frequency (DwPTS), and protection is (GP) and three channels of ascending pilot frequency (UpPTS) at interval.Wherein, wherein, the time-frequency resource allocating of DwPTS is used to transmit down-bound pilot frequency signal for primary synchronization channel (P-SCH), and the time-frequency resource allocating of UpPTS is given uplink random access channel (PRACH), is used to transmit uplink pilot signal.Usually, the up-downgoing switching point is between service subframe TS3 and TS4, and TS1 to TS3 is the uplink service time slot, and TS4 to TS6 is the downlink business time slot.
As the TD-SCDMA standard that adopts time division duplex (TDD) mode in the 3-G (Generation Three mobile communication system), the first-selected frame structure in its Long Term Evolution scheme (LTE TDD) is the second class frame structure.The business time-slot of LTETDD comprises long loop prefix (CP) and two kinds of structure of time slot of short CP, and its short-and-medium CP is used for sub-district among a small circle, and long CP is used for sub-district or many Cell Broadcast CBs on a large scale.OFDM (OFDM) system with the 20M bandwidth is an example, if the minimum time granularity is expressed as T
s=1/ sample frequency, then the duration of an OFDM symbol is (2048+CP) T
s, T
s=1/ (15000+2048).In order to satisfy the slot length of 0.675ms, in short CP structure, CP length is 224 T
s, each business time-slot comprises that 9 OFDM symbols and a length are 288 T
sThe idle no time interval (TI), i.e. (9 * (2048+224)+288) T
s=0.675ms.In long CP structure, CP length is 512T
s, each business time-slot comprises that 8 OFDM symbols and a length are 256T
sTI, i.e. (8 * (2048+512)+256) T
s=0.675ms.As seen,, therefore in each business time-slot, can there be idle no TI, when utilizing this class frame structure to carry out transfer of data, certainly will causes the waste of resource owing to the OFDM symbolic number in each business time-slot all is that non-integer is individual.
Summary of the invention
In view of this, data transmission method in the long evolving system that a kind of Time Division-Synchronous Code Division Multiple Access inserts is provided on the one hand among the present invention, provide data transmission system and device in the long evolving system that a kind of Time Division-Synchronous Code Division Multiple Access inserts on the other hand, so that economize on resources.
Data transmission method in the long evolving system that Time Division-Synchronous Code Division Multiple Access provided by the invention inserts comprises:
The length of each business time-slot is set to the length of an integer orthogonal frequency division multiplex OFDM symbol in the radio half frame;
The difference of the length of radio half frame and the length of all business time-slots is set to the length of special time slot;
Utilize described radio half frame to carry out transfer of data.
Wherein, the length that the length of each business time-slot is set to an integer OFDM symbol in the described radio half frame comprises: keep in the radio half frame in each business time-slot the number of OFDM symbol constant, reduce the length of the cyclic prefix CP in each OFDM symbol in each business time-slot, and remove the length of the free time interval T I in each business time-slot;
The length that the difference of the length of described radio half frame and the length of all business time-slots is set to special time slot is: the length of special time slot in the radio half frame is expanded according to CP length of reducing in the business time-slot and the TI length removed.
Wherein, for the ofdm system of 20M bandwidth, the length of the cyclic prefix CP in each business time-slot of described reduction in each OFDM symbol comprises: for short CP structure of time slot, be 144 minimum time granularity T with the CP length reduction in the business time-slot
s,, be 416 minimum time granularity T with the CP length reduction in the business time-slot for long CP structure of time slot
s
Described length with special time slot in the radio half frame is expanded according to CP length of reducing in the business time-slot and the TI length removed and comprised: with the extended length of special time slot in the radio half frame is 0.505ms.
Wherein, for short CP structure of time slot, described length is that the special time slot of 0.505ms comprises 7 OFDM symbols;
For long CP structure of time slot, described length is that the special time slot of 0.505ms comprises 6 OFDM symbols.
Wherein, described special time slot comprises N OFDM symbol, describedly utilize described radio half frame to carry out transfer of data to comprise: when carrying out transfer of data, with first OFDM symbol of special time slot as descending pilot frequency DwPTS, the time-frequency resource allocating that DwPTS is shared is given primary synchronization channel P-SCH, with second to M OFDM symbol of special time slot as protection GP at interval, with M+1 to the N the time-frequency resource allocating that the OFDM symbol is shared of special time slot to uplink random access channel PRACH;
Wherein, M, N are natural number, and 2≤M≤N.
Perhaps, described special time slot comprises N OFDM symbol, describedly utilize described radio half frame to carry out transfer of data to comprise: when carrying out transfer of data, the time-frequency resource allocating that first OFDM symbol of special time slot is shared is given auxiliary synchronization channel S-SCH, with second OFDM symbol of special time slot as descending pilot frequency DwPTS, the time-frequency resource allocating that DwPTS is shared is given primary synchronization channel P-SCH, as GP, give PRACH with the 3rd to M OFDM symbol of special time slot with M+1 to the N the time-frequency resource allocating that the OFDM symbol is shared of special time slot;
Wherein, M, N are natural number, and 3≤M≤N.
Wherein, describedly utilize described radio half frame to carry out transfer of data further to comprise: user equipment (UE) is according to the position of DwPTS in the described radio half frame, determine the OFDM symbol that S-SCH is shared, intercept the length of long CP and short CP respectively from the end of determined OFDM symbol, and the length that intercepted and the CP section among the S-SCH are carried out relevant, if correlation when correlation is less than the short CP of intercepting during the long CP of twice correlation sizableness or intercepting determines that then CP is weak point CP, otherwise, determine that then CP is long CP;
According to determined CP, described S-SCH is positioned demodulation.
Perhaps, described special time slot comprises N OFDM symbol, describedly utilize described radio half frame to carry out transfer of data to comprise: when carrying out transfer of data, with first OFDM symbol of special time slot as descending pilot frequency DwPTS, the time-frequency resource allocating that DwPTS is shared is given primary synchronization channel P-SCH, the time-frequency resource allocating that second OFDM symbol of special time slot is shared is given auxiliary synchronization channel S-SCH, as GP, give PRACH with the 3rd to M OFDM symbol of special time slot with M+1 to the N the time-frequency resource allocating that the OFDM symbol is shared of special time slot;
Wherein, M, N are natural number, and 3≤M≤N.
Wherein, describedly utilize described radio half frame to carry out transfer of data further to comprise: user equipment (UE) is according to the position of DwPTS in the described radio half frame, determine the OFDM symbol that S-SCH is shared, intercept the length of long CP and short CP respectively from the top of determined OFDM symbol, and the length that is intercepted is correlated with the terminal identical length of determined OFDM symbol, correlation when if correlation is lacked CP less than intercepting during the long CP of twice correlation sizableness or intercepting, determine that then CP is short CP, otherwise, determine that then CP is long CP;
According to determined CP, described S-SCH is positioned demodulation.
Perhaps, described special time slot comprises N OFDM symbol; Describedly utilize described radio half frame to carry out transfer of data to comprise: when carrying out transfer of data, as GP, give PRACH with M+1 to the N the time-frequency resource allocating that the OFDM symbol is shared of special time slot with first to M OFDM symbol of special time slot;
Wherein, M, N are natural number, and 1≤M≤N.
Wherein, describedly utilize described radio half frame to carry out transfer of data further to comprise: give primary synchronization channel P-SCH as descending pilot frequency DwPTS with shared time-frequency resource allocating with last OFDM symbol of first business time-slot TS0, the time-frequency resource allocating that the penult OFDM symbol of TS0 is shared is given auxiliary synchronization channel S-SCH.
The value of above-mentioned M can be determined according to cell coverage area.
Preferably, describedly utilize described radio half frame to carry out transfer of data further to comprise: give PRACH with the time-frequency resource allocating at least one business time-slot in the uplink service time slot.
Preferably, describedly utilize described radio half frame to carry out transfer of data further to comprise: other running time-frequency resource of distributing in M+1 to the N the OFDM symbol with special time slot outside the PRACH is used to transmit reference symbol and/or business datum and/or control signaling.
Wherein, distributing to other running time-frequency resource outside the PRACH in described M+1 to the N the OFDM symbol with special time slot is used to transmit reference symbol and comprises: will be the one or more Resource Block of each UE corresponding reference allocation of symbols taking one or more OFDM symbols take one or continuous a plurality of subcarriers on frequency domain running time-frequency resource on the time domain as Resource Block.
Data transmission system in the long evolving system that Time Division-Synchronous Code Division Multiple Access provided by the invention inserts comprises: evolution base station eNodeB and user equipment (UE),
Wherein, described eNodeB is used for carrying out transfer of data with UE according to the method described above.
Device in the long evolving system that Time Division-Synchronous Code Division Multiple Access provided by the invention inserts is used for carrying out according to the method described above transfer of data.
From such scheme as can be seen, be set to the length of an integer OFDM symbol among the present invention by the length of each business time-slot in the radio half frame, the difference of the length of radio half frame and the length of described business time-slot is set to the length of special time slot, the length of described special time slot is the length of an integer OFDM symbol, and utilize the radio half frame after being provided with to carry out transfer of data, thereby improved the utilance of resource, saved resource.
In addition, being set to the length of an integer OFDM symbol by the length of special time slot, can an integer OFDM symbol be unit also thereby make the resource allocation of special time slot, has improved the flexibility that special time slot resource distributes.
And further, the length of GP in the special time slot among the present invention can be adjusted as required by the granularity of OFDM symbol, the length of UpPCH also can be adjusted by the granularity of OFDM symbol, thereby make the resource allocation of special time slot flexible, can realize resource allocation flexibly according to the demand of time delay and coverage.
At last, be used to transmit reference symbol and/or business datum and/or control signaling by other running time-frequency resource of distributing in M+1 to the N the OFDM symbol with special time slot outside the PRACH, thereby further economize on resources, improve resource utilization.
Description of drawings
Fig. 1 is the schematic diagram of the second class frame structure that the LTE system is supported in the prior art;
Fig. 2 is the exemplary process diagram of the data transmission method in the long evolving system that Time Division-Synchronous Code Division Multiple Access inserts in the embodiment of the invention;
Fig. 3 is the schematic diagram of a kind of resource allocation of special time slot in the embodiment of the invention;
Fig. 4 is the schematic diagram of another resource allocation of special time slot in the embodiment of the invention;
Fig. 5 is that a kind of position of S-SCH and DwPTS concerns schematic diagram in the embodiment of the invention;
Fig. 6 is that another position of S-SCH and DwPTS concerns schematic diagram in the embodiment of the invention;
Fig. 7 is the schematic diagram of another resource allocation of special time slot in the embodiment of the invention;
Fig. 8 is a structural representation of the shared running time-frequency resource of UpPCH in the embodiment of the invention;
The schematic diagram of Fig. 9 in the embodiment of the invention running time-frequency resource except that the shared video resource of UpPCH in the special time slot being distributed.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
Fig. 2 is the exemplary process diagram of the data transmission method in the long evolving system that Time Division-Synchronous Code Division Multiple Access inserts in the embodiment of the invention.As shown in Figure 2, this flow process comprises the steps:
In this step, during specific implementation, be set to the length of an integer OFDM symbol for the length of each business time-slot in the radio half frame, and the slot length of the structure of time slot of long CP and short CP is equated, length that can be by adjusting CP, remove TI and change OFDM symbol numbers wait and realize, according to the situation that business time-slot is set, the difference of the length of radio half frame and the length of described business time-slot is set to the length of special time slot afterwards.Can be that unit carries out the Bearer Channel distribution with an integer OFDM symbol lengths in order to make special time slot in addition, also can be set to comprise an integer OFDM symbol by special time slot simultaneously.Enumerate wherein a kind of situation below:
For length is the radio half frame of 5ms, can keep the number of the interior OFDM symbol of each business time-slot in the radio half frame constant, reduce the length of the cyclic prefix CP in each OFDM symbol in each business time-slot, and remove the length of the TI in each business time-slot, afterwards the length of special time slot in the radio half frame is expanded according to CP length of reducing in the business time-slot and the TI length removed.
Ofdm system with the 20M bandwidth is an example, carries out radio half frame and divides timing, for the structure of time slot of short CP: can be with CP length by 224T
sChange 144T into
s, each business time-slot still keeps 9 OFDM symbols, remove TI after, slot length is 9 * (2048+144) T
s=19728T
s=0.6421875ms.Structure of time slot for long CP: can be with CP length by 512T
sChange 416T into
s, each business time-slot still keeps 8 OFDM symbols, remove TI after, slot length is 8 * (2048+416) T
s+ 16T
s=19728T
s=0.6421875ms promptly only has more 16T in each business time-slot this moment
sTI, can ignore.As seen, be set to the length of an integer OFDM symbol by the length of business time-slot, thereby saved resource.
TDD LTE frame structure in the present embodiment has kept the compatibility with LTE FDD on the symbol rank, promptly be all (2048+144) T
sOn the time slot rank, keep the compatibility with former LTE TDD/TD-SCDMA system, promptly still kept 7 business time-slots of LTE TDD/TD-SCDMA system, the frame structure of a special time slot.
TDD LTE frame structure in the embodiment of the invention is incorporated in the special time slot saving CP length down and the TI length of removing, and transform the length of special time slot the length of 0.5046875ms as, and for the structure of time slot of lacking CP, special time slot is 7 * (2048+144) T
s+ 160T
s=0.5046875ms ≈ 0.505ms promptly comprises 7 OFDM symbols altogether, and for the structure of time slot of long CP, special time slot is 6 * (2048+418) T
s+ 720T
s=0.5046875ms promptly comprises 6 OFDM symbols altogether, as seen, when special time slot carries out resource allocation, can be discontented with an OFDM symbol length (as: in the 20M bandwidth system, the 160T during short CP
s, the 720T during long CP
s) distribute to GP, the distribution of other resource can an integer OFDM symbol be that unit carries out then, thereby has improved the flexibility that special time slot resource distributes.Certainly, the resource allocation of special time slot can be not that unit distributes with an integer OFDM symbol also.
As seen, the TDD LTE frame structure in the present embodiment, business time-slot and special time slot can an integer OFDM symbol be unit all, and the CP of all OFDM symbols can be isometricly, have simplified frame structure and resource allocation granularity.
In addition, with the structure of time slot of lacking CP is example, in the frame structure of the prior art, spectrum efficiency is: 2048/ (2048+224)=90.14%, in the frame structure in the present embodiment, again and again efficient is: 2048/ (2048+144)=93.43%, by shortening CP length, also improved system spectral efficiency in the visible embodiment of the invention.
In this step, during specific implementation, multiple implementation can be arranged.Wherein, when carrying out transfer of data, can still distribute, also can distribute according to other distribution method by distribution method of the prior art for the time-frequency resource allocating evolution base station (eNodeB) of business time-slot.Time-frequency resource allocating eNodeB for special time slot can still distribute by distribution method of the prior art, also can distribute according to other distribution method.For example, suppose that special time slot comprises N OFDM symbol, then can have following several allocative decision.
Scheme one:
As shown in Figure 3, Fig. 3 shows the schematic diagram of a kind of resource allocation of special time slot in the embodiment of the invention.Wherein, as descending pilot frequency DwPTS, the time-frequency resource allocating that DwPTS is shared is given P-SCH to eNodeB with first OFDM symbol of special time slot; Except the length allocation of a discontented OFDM symbol that will have more in the special time slot gives protection at interval the GP, also can be with second to M OFDM symbol of special time slot as GP; M+1 to the N OFDM symbol of special time slot inserted pulse (UpPCH) part or all (part in special time slot can be equivalent to UpPTS) as uplink random, give uplink random access channel PRACH shared time-frequency resource allocating.Wherein, M, N are natural number, and 2≤M≤N, and the value of M is determined according to cell coverage area.When the needs cell coverage area is big, the M value can be transferred big.For example, for the short CP structure of time slot in the ofdm system of 20M bandwidth, when radius of society is approximately 22 kilometers, but then the M value is 3, and this moment, GP length was two OFDM symbols of 160Ts+, was about 148 microseconds.
Scheme two:
As shown in Figure 4, Fig. 4 shows the schematic diagram of another resource allocation of special time slot in the embodiment of the invention.Wherein, the eNodeB time-frequency resource allocating that first OFDM symbol of special time slot is shared is given auxiliary synchronization channel (S-SCH), and at this moment, S-SCH no longer takies the running time-frequency resource of TS0; As descending pilot frequency DwPTS, the time-frequency resource allocating that DwPTS is shared is given primary synchronization channel P-SCH with second OFDM symbol of special time slot; Except the length allocation of a discontented OFDM symbol that will have more in the special time slot is given the GP, also can be with the 3rd to M OFDM symbol of special time slot as GP; As UpPCH, give PRACH with M+1 to the N OFDM symbol of special time slot with shared time-frequency resource allocating.Wherein, M, N are natural number, and 3≤M≤N, and the value of M is determined according to cell coverage area.
For this allocative decision, owing to the length of DwPTS is fixed, after DwPTS finishes synchronously, subscriber equipment (UE) can be according to the position of DwPTS, accurately navigate to S-SCH place OFDM character position, thereby S-SCH is positioned demodulation, to determine cell ID (ID) and other broadcast message.Detailed process comprises: determine that at first CP for long CP or short CP, then according to determined CP, positions demodulation to described S-SCH.Referring to Fig. 5, a kind of position that Fig. 5 shows S-SCH and DwPTS concerns schematic diagram.Because the length of DwPTS is fixed, therefore can be according to the position of DwPTS in the radio half frame, determine the A point, it is the shared OFDM symbol of S-SCH, because CP is made of the end portion of OFDM symbol, therefore can intercept the length of long CP and short CP respectively from the end of determined OFDM symbol, promptly intercept the length of long CP and short CP forward from the A point, and carry out relevant with the CP section among the S-SCH length that is intercepted, if correlation when correlation is less than the short CP of intercepting during the long CP of twice correlation sizableness or intercepting determines that then CP is weak point CP, otherwise, when intercepting when correlation is obviously greater than the short CP of intercepting during long CP during correlation, then definite CP is long CP.Afterwards, according to determined CP, S-SCH is positioned demodulation.
In addition, in scheme two, the position of S-SCH and DwPTS can exchange, and first OFDM symbol that is about to special time slot is as descending pilot frequency DwPTS, and the time-frequency resource allocating that DwPTS is shared is given P-SCH; The time-frequency resource allocating that second OFDM symbol of special time slot is shared is given auxiliary synchronization channel S-SCH.
At this moment, UE can accurately navigate to S-SCH place OFDM character position according to the position of DwPTS equally.Referring to Fig. 6, another position that Fig. 6 shows S-SCH and DwPTS concerns schematic diagram.At this moment, UE can be according to the position of DwPTS in the radio half frame, determine the B point, it is the shared OFDM symbol of S-SCH, because CP is made of the end portion of OFDM symbol, therefore can intercept the length of long CP and short CP respectively from the top of determined OFDM symbol, promptly intercept the length of long CP and short CP backward from the B point, and the length that is intercepted is correlated with the terminal identical length of determined OFDM symbol, if correlation when correlation is less than the short CP of intercepting during the long CP of twice correlation sizableness or intercepting determines that then CP is weak point CP, otherwise, when intercepting when correlation is obviously greater than the short CP of intercepting during long CP during correlation, then definite CP is long CP.Afterwards, according to determined CP, S-SCH is positioned demodulation.
Scheme three:
As shown in Figure 7, Fig. 7 shows the schematic diagram of another resource allocation of special time slot in the embodiment of the invention.Wherein, eNodeB gives the GP except the length allocation of being discontented with an OFDM symbol that will have more in the special time slot, also can be with first to M OFDM symbol of special time slot as GP, as UpPCH, give PRACH with M+1 to the N OFDM symbol of special time slot with shared time-frequency resource allocating.Wherein, M, N are natural number, and 1≤M≤N, and the value of M is determined according to cell coverage area.
At this moment, eNodeB can remove DwPTS from special time slot, and take last OFDM symbol of TS0, accordingly, S-SCH takies the penult OFDM symbol of TS0, last the OFDM symbol that is about to TS0 is given P-SCH as descending pilot frequency DwPTS with shared time-frequency resource allocating, and the time-frequency resource allocating that the penult OFDM symbol of TS0 is shared is given auxiliary synchronization channel S-SCH.
As seen, in above-mentioned three kinds of schemes, the length of GP can be adjusted as required by the granularity of an OFDM symbol, and the length of UpPCH (refering in particular to the part of Random Access Channel at special time slot herein) also can be adjusted by the granularity of an OFDM symbol.In addition, the UpPCH that mentions in above-mentioned three kinds of schemes can be the part of UpPCH, a part can take several business time-slots in addition, for example whole UpPCH crosses over N OFDM symbol of special time slot M+1 to the and/or TS1 and/or TS2 even all ascending time slots, then the length of UpPCH maximum possible is for the length of all ascending time slots accumulative total adds the length of M+1 to the N OFDM symbol in the special time slot, is about in the uplink service time slot time-frequency resource allocating at least one business time-slot to PRACH.
As shown in Figure 8, Fig. 8 shows a structural representation of the shared running time-frequency resource of UpPCH.Among Fig. 8, UpPCH has crossed over the length of N OFDM symbol of special time slot M+1 to the and TS1, TS2.Owing to stipulate in the LTE standard, no matter system bandwidth is much, DwPTS and UpPCH only take 1.25MHz (wherein, DwPTS only takies the 1.25MHz at center, if UpPCH has a plurality of, then each UpPCH takies the bandwidth of a 1.25MHz respectively), be that DwPTS and UpPCH have only taken 1.25MHz among Fig. 8, other running time-frequency resource of distributing to outside the PRACH in therefore can M+1 to the N OFDM symbol with special time slot is used to transmit reference symbol (sounding) and/or business datum and/or controls signaling.When the transmission reference symbol, can be with each UE corresponding reference symbol on time domain, to take one or more OFDM symbols, taking one or continuous a plurality of subcarriers on frequency domain is that unit distributes, and can save the resource that reference symbol takies at business time-slot like this.
Referring to Fig. 9, the schematic diagram of Fig. 9 in the embodiment of the invention running time-frequency resource except that the shared video resource of UpPCH in the special time slot being distributed.Suppose that the UpPCH length in special time slot is 4 OFDM symbols, then can be provided with above the UpPCH and be: be an OFDM symbol on time domain with following Resource Block, be 12 subcarriers on frequency domain, when then transmitting the reference symbol of a UE, can take one or more such Resource Block.
As seen, the data transmission system in the long evolving system of the access of the Time Division-Synchronous Code Division Multiple Access in the embodiment of the invention comprises: eNodeB and UE.Wherein, the two can carry out transfer of data according to method flow shown in Figure 2.Device in the long evolving system that Time Division-Synchronous Code Division Multiple Access inserts in the embodiment of the invention mainly refers to eNodeB and UE.Wherein, eNodeB and UE can carry out transfer of data according to method flow shown in Figure 2.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is preferred embodiment of the present invention; be not to be used to limit protection scope of the present invention; within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1, the data transmission method in a kind of long evolving system of Time Division-Synchronous Code Division Multiple Access access is characterized in that this method comprises:
The length of each business time-slot is set to the length of an integer orthogonal frequency division multiplex OFDM symbol in the radio half frame;
The difference of the length of radio half frame and the length of all business time-slots is set to the length of special time slot;
Utilize described radio half frame to carry out transfer of data.
2, the method for claim 1, it is characterized in that, the length that the length of each business time-slot is set to an integer OFDM symbol in the described radio half frame comprises: keep in the radio half frame in each business time-slot the number of OFDM symbol constant, reduce the length of the cyclic prefix CP in each OFDM symbol in each business time-slot, and remove the length of the free time interval T I in each business time-slot;
The length that the difference of the length of described radio half frame and the length of all business time-slots is set to special time slot is: the length of special time slot in the radio half frame is expanded according to CP length of reducing in the business time-slot and the TI length removed.
3, method as claimed in claim 2, it is characterized in that, for the ofdm system of 20M bandwidth, the length of the cyclic prefix CP in each business time-slot of described reduction in each OFDM symbol comprises: for short CP structure of time slot, be 144 minimum time granularity T with the CP length reduction in the business time-slot
s,, be 416 minimum time granularity T with the CP length reduction in the business time-slot for long CP structure of time slot
s
Described length with special time slot in the radio half frame is expanded according to CP length of reducing in the business time-slot and the TI length removed and comprised: with the extended length of special time slot in the radio half frame is 0.505ms.
4, method as claimed in claim 3 is characterized in that, for short CP structure of time slot, described length is that the special time slot of 0.505ms comprises 7 OFDM symbols;
For long CP structure of time slot, described length is that the special time slot of 0.505ms comprises 6 OFDM symbols.
5, the method for claim 1 is characterized in that, described special time slot comprises N OFDM symbol;
Describedly utilize described radio half frame to carry out transfer of data to comprise: when carrying out transfer of data, with first OFDM symbol of special time slot as descending pilot frequency DwPTS, the time-frequency resource allocating that DwPTS is shared is given primary synchronization channel P-SCH, with second to M OFDM symbol of special time slot as protection GP at interval, with M+1 to the N the time-frequency resource allocating that the OFDM symbol is shared of special time slot to uplink random access channel PRACH;
Wherein, M, N are natural number, and 2≤M≤N.
6, the method for claim 1 is characterized in that, described special time slot comprises N OFDM symbol;
Describedly utilize described radio half frame to carry out transfer of data to comprise: when carrying out transfer of data, the time-frequency resource allocating that first OFDM symbol of special time slot is shared is given auxiliary synchronization channel S-SCH, with second OFDM symbol of special time slot as descending pilot frequency DwPTS, the time-frequency resource allocating that DwPTS is shared is given primary synchronization channel P-SCH, as GP, give PRACH with the 3rd to M OFDM symbol of special time slot with M+1 to the N the time-frequency resource allocating that the OFDM symbol is shared of special time slot;
Wherein, M, N are natural number, and 3≤M≤N.
7, method as claimed in claim 6, it is characterized in that, describedly utilize described radio half frame to carry out transfer of data further to comprise: user equipment (UE) is according to the position of DwPTS in the described radio half frame, determine the OFDM symbol that S-SCH is shared, intercept the length of long CP and short CP respectively from the end of determined OFDM symbol, and carry out relevant with the CP section among the S-SCH length that is intercepted, correlation when if correlation is lacked CP less than intercepting during the long CP of twice correlation sizableness or intercepting, determine that then CP is short CP, otherwise, determine that then CP is long CP;
According to determined CP, described S-SCH is positioned demodulation.
8, the method for claim 1 is characterized in that, described special time slot comprises N OFDM symbol;
Describedly utilize described radio half frame to carry out transfer of data to comprise: when carrying out transfer of data, with first OFDM symbol of special time slot as descending pilot frequency DwPTS, the time-frequency resource allocating that DwPTS is shared is given primary synchronization channel P-SCH, the time-frequency resource allocating that second OFDM symbol of special time slot is shared is given auxiliary synchronization channel S-SCH, as GP, give PRACH with the 3rd to M OFDM symbol of special time slot with M+1 to the N the time-frequency resource allocating that the OFDM symbol is shared of special time slot;
Wherein, M, N are natural number, and 3≤M≤N.
9, method as claimed in claim 8, it is characterized in that, describedly utilize described radio half frame to carry out transfer of data further to comprise: user equipment (UE) is according to the position of DwPTS in the described radio half frame, determine the OFDM symbol that S-SCH is shared, intercept the length of long CP and short CP respectively from the top of determined OFDM symbol, and the length that is intercepted is correlated with the terminal identical length of determined OFDM symbol, correlation when if correlation is lacked CP less than intercepting during the long CP of twice correlation sizableness or intercepting, determine that then CP is short CP, otherwise, determine that then CP is long CP;
According to determined CP, described S-SCH is positioned demodulation.
10, the method for claim 1 is characterized in that, described special time slot comprises N OFDM symbol;
Describedly utilize described radio half frame to carry out transfer of data to comprise: when carrying out transfer of data, as GP, give PRACH with M+1 to the N the time-frequency resource allocating that the OFDM symbol is shared of special time slot with first to M OFDM symbol of special time slot;
Wherein, M, N are natural number, and 1≤M≤N.
11, method as claimed in claim 10, it is characterized in that, describedly utilize described radio half frame to carry out transfer of data further to comprise: give primary synchronization channel P-SCH as descending pilot frequency DwPTS with shared time-frequency resource allocating with last OFDM symbol of first business time-slot TS0, the time-frequency resource allocating that the penult OFDM symbol of TS0 is shared is given auxiliary synchronization channel S-SCH.
As each described method in the claim 5 to 11, it is characterized in that 12, the value of described M is determined according to cell coverage area.
13, as each described method in the claim 5 to 11, it is characterized in that, describedly utilize described radio half frame to carry out transfer of data further to comprise: give PRACH the time-frequency resource allocating at least one business time-slot in the uplink service time slot.
14, as each described method in the claim 5 to 11, it is characterized in that, describedly utilize described radio half frame to carry out transfer of data further to comprise: other running time-frequency resource of distributing in M+1 to the N the OFDM symbol with special time slot outside the PRACH is used to transmit reference symbol and/or business datum and/or control signaling.
15, method as claimed in claim 14, it is characterized in that, distributing to other running time-frequency resource outside the PRACH in described M+1 to the N the OFDM symbol with special time slot is used to transmit reference symbol and comprises: will be the one or more Resource Block of each UE corresponding reference allocation of symbols taking one or more OFDM symbols take one or continuous a plurality of subcarriers on frequency domain running time-frequency resource on the time domain as Resource Block.
16, the data transmission system in a kind of long evolving system of Time Division-Synchronous Code Division Multiple Access access is characterized in that this system comprises: evolution base station eNodeB and user equipment (UE),
Wherein, described eNodeB is used for carrying out transfer of data according to claim 1 to each described method of claim 15 and UE.
17, the device in a kind of long evolving system of Time Division-Synchronous Code Division Multiple Access access is characterized in that described device is used for carrying out transfer of data according to claim 1 to each described method of claim 15.
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| CN2007101764239A CN101420265B (en) | 2007-10-26 | 2007-10-26 | Data transmission method, system and device in long term evolution system |
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