CN101399601B - Time division system frame construction, setting method, processing method and device thereof - Google Patents
Time division system frame construction, setting method, processing method and device thereof Download PDFInfo
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- CN101399601B CN101399601B CN2007100464082A CN200710046408A CN101399601B CN 101399601 B CN101399601 B CN 101399601B CN 2007100464082 A CN2007100464082 A CN 2007100464082A CN 200710046408 A CN200710046408 A CN 200710046408A CN 101399601 B CN101399601 B CN 101399601B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a time division system frame structure with control information indication, and an arrangement method, a processing method and a device thereof. The arrangement method comprises the following steps: a reference sequence is used as a basic code of a reference mark in at least one conventional time slot of at least one subframe, wherein, the reference sequence is selected from a plurality of cyclic shift sequences with different cyclic shift numbers in the same fundamental sequence, each cyclic shift sequence respectively represents a control information indication, and each control information indication is corresponding to the state information of the subsequent L (L is a positive integer) frame of the time division system frame. Therefore, a receiving device can flexibly process the special time slots with the control information in the subsequent frame according to the state information corresponding to the control information indication so as to avoid additional energy loss and processing time delay.
Description
Technical field
The present invention relates to third generation universal mobile telecommunications system technical field, the frame structure with control information indication in a kind of time-division system particularly, in the method that the control information indication is set of this frame structure, and the method and apparatus of processing this frame structure at receiving terminal.
Background technology
In traditional broadcast system, analog television broadcast for example is in order to expand the coverage area, the adjacent transmission platform uses different frequency to avoid the phase mutual interference, same frequency must ability be multiplexing in addition at certain distance, multiple frequency network, MFN (Multi-Frequency Network, MFN) mode that Here it is.Under this mode, one road signal need take several times frequency bandwidth, has consumed valuable frequency spectrum resource.
Along with being becoming tight frequency spectrum resource day and the development of signal processing technology, the networking mode of single frequency network becomes focus.So-called single frequency network (Single Frequency NetworK, SFN) refers to that the same time of several transmitting stations is at the same signal of same frequency emission, to realize the reliable covering to certain service area.The largest benefit that single frequency network is brought is the raising of spectrum efficiency, sends one road signal in the coverage and only needs a frequency.For the television broadcasting of the larger bandwidth of need, this advantage is more outstanding.The diversity that a plurality of transmitting station synchronous workings are brought also so that the reliability that receives is enhanced, obtains better program coverage rate.In addition, by adjustment and the optimization to transmit network (such as the height of the quantity of transmitter, distribution, individual transmitter, transmitting power etc.), also can reduce total power consumption, alleviate the interference near other networks, even change easily and flexibly as required the distribution of overlay area.
Proposition and the multi-carrier modulation of single frequency network interrelate, for example OFDM (Orthogonal Frequency Division Multiplexing, OFDM).In the standard that the Long Term Evolution project of 3GPP normal structure (Long Term Evolution, LTE) is worked out, introduce OFDM, adopted orthogonal frequency division multiplexing multiple access (OFDMA) mode.When it works in TDD mode, a kind of frame structure wherein, basic identical with the frame structure of present TD-SCDMA system.
For cdma system, under the single frequency network pattern, come from the signal of different base station, can be moved terminal and think multipath signal, and then carry out diversity and process.But to a certain extent, the CDMA single frequency network increases to the disposal ability of its receiver.A main change is, receiver want to tolerate more long delay and its power may with the suitable multipath signal of main footpath signal.Therefore, between each base station regularly synchronously, the data that send synchronous, the receptivity of portable terminal is had a significant impact.
As shown in Figure 1, be the example of a typical cell mobile communication systems.This system is by a plurality of residential quarters 100
1-100
Z(being designated as 100) consists of, and a base station (Node B) 101 is wherein respectively arranged in each residential quarter
1-101
Z(being designated as 101), there is the user terminal (UE) 102 of some in the while in this residential quarter service range
1-102
K(being designated as 102).Each user terminal 102 by with affiliated Serving cell 100 in base station 101 keep being connected, finish and other communication equipment between communication function.The channel that communicates between user terminal 102 and the base station 101 is called as up channel from the channel of user terminal 102 101 directions to the base station, and 101 channels to user terminal 102 directions are called as down channel from the base station.Base station 101 is again by 103 control and managements of radio network controller (RNC).By base station 101, radio network controller 103 and other network element devices together, just consisted of land radio access web (UTRAN) 110.
TD-SCDMA is a part of 3G standard.There are a plurality of carrier resources a residential quarter of present TD-SCDMA system.
Be illustrated in figure 2 as the frame structure schematic diagram of TD-SCDMA system.This structure is according to providing in low spreading rate time division duplex (LCR-TDD) pattern (1.28Mcps) among 3G collaborative project (3GPP) standard TS 25.221 (Release4).The spreading rate of TD-SCDMA system is 1.28Mcps, and the length of each radio frames 200 is 10ms, and is divided into two subframes 201 that structure is identical
0, 201
1, the length of each subframe is 5ms, i.e. 6400 chips (Chip).Wherein, the subframe in each TD-SCDMA system is (with subframe 201
0Be example) can be divided into again: (TS0～TS6) 202 for 7 time slots
0-202
6Two pilot time slots: descending pilot frequency time slot (DwPTS) 203 and uplink pilot time slot (UpPTS) 205; An and protection interval (Guard) 204.
Further, the TS0 time slot 202
0Be used to bearing system broadcast channel and other possible downlink traffic channel; And TS1～TS6 time slot 202
1-202
6Then be used to carry the uplink and downlink Traffic Channel.It is synchronous that uplink pilot time slot 205 and descending pilot frequency time slot 203 are used to respectively to set up initial uplink and downlink.
TS0～TS6 time slot 202
0-202
6Length is 0.675ms or 864 chips, wherein comprise data segment Data Part1 (208) and Data Part2 (210) that two segment lengths are 352 chips, and a middle segment length is the reference symbol of 144 chips---middle leading code (Midamble) sequence 209.Middle guiding code sequence 209 is significant at TD-SCDMA, comprise cell ID, channel estimating and synchronously modules such as (comprising Frequency Synchronization) all to use it.
It is descending synchronous code (SYNC-DL) code word 206 of 64 chips that descending pilot frequency time slot 203 comprises the protection interval 211 of 32 chips and one long, and its effect is cell ID and sets up initial synchronisation; And upper every trade pilot time slot 205 comprise one long be uplink synchronous code (SYNC-UL) code word 207 of 128 chips, subscriber terminal equipment utilizes it to carry out relevant up access procedure.At TS1～TS6 time slot 202
1-202
6Between a transfer point (Switching Point) 212 is arranged.When the up-downgoing ratio was 3: 3, transfer point 212 was positioned at TS3～TS4 time slot 202
3-202
4Between, at this moment, the employed up Dedicated Traffic Channel of user terminal is dispensed on TS1～TS3 time slot 202
1-202
3In, down channel then is distributed in TS4～TS6 time slot 202 usually
4-202
6In.
It is professional that the broadcast type multimedia services such as mobile TV belong to the downlink broadcast class.In order to provide more multimedia service at a carrier wave, a kind of complete descending special carrier technology is suggested, and namely all time slots on carrier wave are descending time slot.Special carrier among the TD-SCDMA can form single frequency network usually, i.e. the SFN special carrier.
As shown in Figure 3, be TD-SCDMA special carrier subframe structure schematic diagram.In this structure, two pilot time slots among the TD-SCDMA (descending pilot frequency time slot (DwPTS) 203 and uplink pilot time slot (UpPTS) 205) and protection interval (Guard) 204 are merged into the in short-term gap 302 that length is 352 chips
1(for sake of convenience, gap while label is 310 in short-term); Correspondingly, among the TD-SCDMA other time slots as long time slot (302
0, 302
2～302
7) be redesigned.No matter still gap in short-term of long time slot all is made of leading reference symbol (PreAmble) 309 and data division (Data Part) 308; The data division (308 of long time slot wherein
0, 308
2～308
7) length is 752 chips, gap 302 in short-term
1Data division 308
1Length is 240 chips.Each leading reference symbol (PreAmble) 309 is made of 313 and reference symbol basic codes of a Cyclic Prefix (CP) (PA Code) 314, and wherein Cyclic Prefix 313 is identical with the afterbody of reference symbol basic code 314.Cyclic Prefix 313 is usually designed to 32 or 48 chips, in order to adapt to the large situation of SFN network multi-path time delay.When Cyclic Prefix 313 was usually designed to 32 chip, leading reference symbol 309 can be shorter when being designed to 48 chip, and correspondingly, the data division 308 in the time slot can take more chips.
In addition, by leading reference symbol 309 is divided into two parts, the technical scheme that is put into time slot 302 two ends also is suggested, with the distribution of change time slot internal reference symbol, and then the performance of the interior channel estimating of change time slot.
System can send control information at time slot 310 selectively, i.e. the 310 transmitting system control informations of time slot in some subframes, and in the other subframe, do not send control information.When not sending control information, this part resource can be used for business transferring or keep need not.According to this situation, whether if receiver is all processed the signal of time slot 310 at each frame, reconvicting afterwards is that useful information then can bring extra expense for receiving equipment.Therefore, make receiving equipment can obtain indication if can design a kind of easy method, only the time slot 310 that comprises control information is processed then and can be reduced time and the unnecessary expense in power consumption aspect for receiving equipment to a certain extent.
In sum, for the mobile TV class broadcasting service on the special carrier, the TD-SCDMA system need to increase a kind of reception indication of Downlink Control Information.
Summary of the invention
One object of the present invention is to provide a kind of method that the control information indication is set in time division system frame construction, by the control information indication, receiving equipment can be processed accordingly to received signal flexibly, avoids extra energy loss and processes time-delay.
Another object of the present invention is to provide a kind of time division system frame construction with control information indication, it has control information indication and can be received equipment and obtain, receiving equipment can be processed accordingly to received signal flexibly, avoid extra energy loss and process time-delay.
A further object of the present invention is to provide a kind of processing method with time division system frame of control information indication, be used for obtaining the control information indication from the frame structure that receives, so that the special time slot to subsequent frame is processed flexibly, avoid extra energy loss and process time-delay.
Another purpose of the present invention provides a kind of processing method with time division system frame of control information indication, processes flexibly according to the control information indication that obtains, to avoid extra energy loss and to process time-delay.
Another purpose of the present invention is to provide a kind for the treatment of facility with time division system frame of control information indication, its reception has the time division system frame of control information indication, the control information indication that obtains is wherein also processed the special time slot of subsequent frame accordingly flexibly, avoids extra energy loss and processes time-delay.
For achieving the above object, the invention provides a kind of method that the control information indication is set in the frame structure of time-division system, this frame structure comprises a plurality of subframes, each subframe comprises a plurality of conventional time slots and at least one special time slot, wherein each conventional time slot comprises reference symbol and data division, each reference symbol comprises basic code and Cyclic Prefix, the method comprises: use a reference sequences as the basic code of the reference symbol at least one conventional time slot of at least one subframe, wherein this reference sequences is a plurality of cyclically shifted sequences with different cyclic shift number of times that are selected from same basic sequence, each cyclically shifted sequences identifies respectively a kind of control information indication, each control information indication is to the state information of follow-up L subframe of follow-up L frame that should time division system frame or this at least one subframe, and wherein L is positive integer.
In the above-mentioned method, described each state information comprises: without control information, the type of control information when control information is arranged.
In the above-mentioned method, this basic sequence is the Zadoff-Chu sequence.
In the above-mentioned method, this reference symbol can be designed to one of them of leading reference symbol, middle reference symbol and rearmounted reference symbol.
In the above-mentioned method, the interval of the cyclic shift number of times of each cyclically shifted sequences is greater than the length of multidiameter delay.
The present invention provides a kind of time division system frame construction with control information indication in addition, comprise a plurality of subframes, each subframe comprises a plurality of conventional time slots and at least one special time slot, wherein each conventional time slot comprises reference symbol and data division, each reference symbol comprises basic code and Cyclic Prefix, wherein the basic code of the reference symbol at least one conventional time slot of at least one subframe is a reference sequences, this reference sequences is a plurality of cyclically shifted sequences with different cyclic shift number of times that are selected from same basic sequence, each cyclically shifted sequences identifies respectively a kind of control information indication, each control information indication is to the state information of follow-up L subframe of follow-up L frame that should frame or this at least one subframe, and wherein L is positive integer.
In the above-mentioned frame structure, each state information comprises: without control information, the type of control information when control information is arranged.
In the above-mentioned frame structure, basic sequence is the Zadoff-Chu sequence.
In the above-mentioned frame structure, each reference symbol is one of them of leading reference symbol, middle reference symbol and rearmounted reference symbol.
In the above-mentioned frame structure, the interval of the cyclic shift number of times of each cyclically shifted sequences is greater than the length of multidiameter delay.
The present invention also provides a kind of processing method with time division system frame of control information indication, be suitable for obtaining the control information indication from the frame structure that receives, this time division system frame has a plurality of subframes, and the method comprises the following steps: at first, receive wireless signal, obtain its baseband signal through processing; Then, each time slot is carried out the frequency shift (FS) calibration; Afterwards, the basic code based on the reference symbol of a plurality of cyclically shifted sequences of same basic sequence and reception with this locality mates, to determine the reference sequences of the employed sign control information indication of this reference symbol, wherein this control information indication is to the state information of follow-up L subframe of follow-up L frame that should frame or its subframe, and L is positive integer; Moreover, utilize this reference sequences that each conventional time slot is carried out channel estimating; And utilize channel estimation results, the value of the data division of each conventional time slot of demodulation.
In the above-mentioned method, the step of mating with the basic code of the reference symbol of local a plurality of cyclically shifted sequences and reception comprises: respectively with the basic code of the reference symbol of these cyclically shifted sequences and the reception associative operation that slides; And
Detect the correlation peak in the described associative operation, the reference sequences that the local cyclically shifted sequences that this peak value is corresponding adopts for the wireless signal that receives.
In the above-mentioned method, basic sequence for example is the Zadoff-Chu sequence.
In the above-mentioned method, each state information comprises: without control information, the type of control information when control information is arranged.
The present invention also provides a kind of and utilizes the control information indication of above-mentioned acquisition to carry out the method that frame is processed, comprise the following steps: at first, receive wireless signal, according to this frame control information indication that obtains in advance special time slot is processed: if learn this frame without control information by this control information indication, then abandon this special time slot; Otherwise, obtain baseband signal through processing; Secondly, special time slot is carried out the frequency shift (FS) calibration; Afterwards, utilize the reference sequences that obtains that each special time slot is carried out channel estimating; And utilize channel estimation results and the configuration parameter of the control information pattern determined according to different control information types, the value of demodulation control information part.
Moreover, the present invention is a kind for the treatment of facility with time division system frame of control information indication also, comprising: radio frequency unit receives wireless signal, whether decision abandons special time slot wherein according to a control signal, and conventional time slot is reached the special time slot process processing acquisition baseband signal that is not dropped; Separator connects this radio frequency unit, separates conventional time slot and special time slot; Conventional time slot processing module, connect this separator, this routine time slot is processed with the acquired information data, and mate with the basic code of the reference symbol of local a plurality of cyclically shifted sequences based on same basic sequence and reception, to determine the reference sequences of the employed sign control information indication of this reference symbol, wherein each control information indication is to the state information of follow-up L subframe of follow-up L frame that should frame or this at least one subframe, and L is positive integer; The special time slot processing module connects this separator, this special time slot is processed, with the value of demodulation control information part; And controller, obtain the control information indication of this subsequent frame from conventional time slot processing module, and this controls signal to this radio frequency unit to indicate output according to the control information of this frame.
In the above-mentioned equipment, this routine time slot processing module comprises: sliding correlation detector, respectively with the basic code of the reference symbol of described optional reference sequences and the reception associative operation that slides; And peak detection block, detect the correlation peak in the described associative operation, determine the reference sequences that local cyclically shifted sequences corresponding to this peak value adopts for the wireless signal that receives.
In the above-mentioned equipment, described basic sequence for example is the Zadoff-Chu sequence.
In the above-mentioned equipment, each state information comprises: without control information, the type of control information when control information is arranged.
Therefore, by technique scheme, the present invention's beneficial effect compared to existing technology is:
The inventive method is utilized a plurality of good circulation autocorrelation performances of cyclically shifted sequences with different cyclic shift number of times of same basic sequence, indicates as Downlink Control Information with different reference sequences.The method can be processed receiving equipment to received signal flexibly, has avoided extra energy loss and processing delay.In the situation that do not increase transmitter and receiving equipment complexity, reduced power consumption and the processing expenditure of receiving equipment.In addition, in the situation that keep spectrum efficiency constant, reduced the expense of terminal.
Description of drawings
Fig. 1 is the rough schematic of typical cell mobile communication systems.
Fig. 2 is TD-SCDMA frame structure schematic diagram in the prior art.
Fig. 3 is the subframe structure schematic diagram that is used for the TD-SCDMA special carrier in the prior art.
Fig. 4 is the present invention to the flow chart of the conventional time slot processing method of the frame structure with broadcast message indication.
Fig. 5 is the present invention to the flow chart of the special time slot processing method of the frame structure with broadcast message indication.
Fig. 6 is the structural representation for the treatment of facility of the present invention.
Embodiment
As shown in Figure 3, system will send control information in the special time slot 310 of some subframes selectively.In order to allow receiver can select neatly the subframe of control information that control information is received, need method of design to notify in certain frame of receiver whether comprise control information.
Still describe as an example of the subframe structure of TD-SCDMA special carrier shown in Figure 3 example, but those skilled in the art as can be known, this is an example of TD-SCDMA frame structure, the present invention is not limited thereto in the concrete example, but can expand in other time division system frame constructions that comprise special time slot (having Downlink Control Information).
With subframe 201
0Be example, its conventional special carrier time slot 302
0, 302
2-302
7Identical structure is arranged, comprise reference symbol part and information data part.Reference symbol generally is comprised of basic code (PA code) and Cyclic Prefix (CP).Reference symbol can be designed to leading reference symbol, middle reference symbol and rearmounted reference symbol as required neatly.
The basic code of reference symbol can adopt a kind of like this reference sequences: its circulation autocorrelation performance is fine, except to the punctual autocorrelation peak, it is very little that the autocorrelation value of other positions is compared this autocorrelation peak, this just means through the correlation of the sequence of cyclic shift and former sequence very little, can distinguish through sequence and the former basic sequence of cyclic shift like this, therefore can come identification information with the different cyclic shifts of same sequence, these information are indicated as control information of the present invention.
The below is take a kind of Zadoff-Chu sequence of satisfying above condition as the example explanation.Particularly, indicate as control information with the reference symbol in the conventional time slot of N (N＞0) individual regulation in a subframe, specifically which time slot is determined by the system upper strata, the selection of time slot is by upper-layer configured, and by the receiver in broadcast channel or the dedicated signaling reporting system.In these time slots, unified certain the basic Zadoff-Chu sequence X that adopts of the basic code of reference symbol is through cyclic shift SHIFT
iSequence after inferior:
Wherein Len refers to the length of sequence, and mod represents (n-SHIFT
i) to length L en delivery.
SHIFT
iCan be several special values of default, the sequence of different cyclic shift number of times can represent the different conditions information of the individual frame of follow-up L (L is positive integer) of this frame, also can represent the different conditions information of the individual subframe of follow-up L (L is positive integer) of this subframe, these state informations such as without control information, control information is arranged, it is various control information types that the control information Further Division is perhaps arranged.Secondly, having under the condition of control information, dissimilar control information also can be distinguished in the same way, only different cyclic shift number of times SHIFT need be set and get final product.For simplicity, the below is only take " each cyclically shifted sequences represents the state information of the individual subframe of follow-up L (L is as positive integer) of this subframe " (namely take subframe as processing unit) as the example explanation.
For instance, cyclic shift SHIFT
iInferior sequence X
jRepresent in the special time slot 310 of L subframe of back and do not have control information; Cyclic shift SHIFT
kInferior sequence X
kIn the special time slot 310 of L subframe of expression back control information is arranged.Like this, receiving terminal just can be according to the cyclically shifted sequences that detects, and judges whether the special time slot of some subframes of back is carried out demodulation, and carries out what kind of processing after the demodulation.It is noted that the possible SHIFT that system arranges
iInterval between the value is greater than the length of multidiameter delay, to eliminate the impact of multipath.
Above-mentioned parameter L is 1,2 ... etc. positive integer, its size can be configured according to the system needs, the disposal ability of main reference receiver, stronger such as the receiver disposal ability, then get less value, such as L=1, this means that receiving terminal indicates to process the special time slot of next subframe according to the control information of this subframe, otherwise, as the receiver disposal ability a little less than, then get larger value, to reserve enough buffer time.
According to said method, obtain a kind of frame structure with time-division system of Downlink Control Information indication, it comprises two subframes that (perhaps a plurality of) structure is similar to conventional subframe structure shown in Figure 3, each subframe comprises a plurality of conventional time slots and at least one special time slot, wherein each conventional time slot comprises reference symbol and data division, each reference symbol comprises basic code and Cyclic Prefix, different is wherein the basic code of the reference symbol at least one conventional time slot be to adopt with same Zadoff-Chu basic sequence through cyclic shift SHIFT
iA plurality of sequence X after inferior
i, respectively in order to identify different control information indications.
Please refer to shown in Figure 4, a kind of method of processing the frame structure of above-mentioned time-division system of the present invention, in order to therefrom to obtain the control information indication, its flow process is as follows, at first, in step 401, receiving terminal receives wireless signal, processing through its radio frequency unit obtains its baseband signal, then carry out the step 402 of each time slot being carried out the frequency shift (FS) calibration, then, in step 403, basic code with the reference symbol of the cyclically shifted sequences of a plurality of basic Zadoff-Chu sequence of this locality and reception mates, to determine the employed reference sequences of this reference symbol.Afterwards, execution in step 404 utilizes this reference sequences that each conventional time slot is carried out channel estimating; And execution in step 405, utilize channel estimation results, the value of the data division of each conventional time slot of demodulation.
This step 401,402,404,405 is conventional art, no longer is described in detail at this.This step 403 further comprises:
Cyclically shifted sequences X with this locality
i(n), n=1,2 ..., N
S, with the reference sequences X that receives
r(n), n=1,2 ..., N
S, at [W+X
r(n), W+X
r(n)] associative operation that slides in the window, wherein 2W is that sliding window is long:
Wherein conjugate operation/operation is got in the * representative.Here N
SThe length of expression sequence; Sliding window W according to the concrete condition of multipath transmisstion time delay by default, and take chip as unit.Adopting slides is correlated with is prominent directly main in order to find, thereby eliminates the impact of multipath transmisstion, but not as limit, the present invention still can adopt general associative operation.
Step 403b judges the position of the appearance of correlation peak.When detecting peak value U
iThe cyclically shifted sequences X of this locality when (j) occurring
i(n) be in sequence X
r(n) in the time of in the detection window, think that then transmitting terminal has adopted reference sequences X
r(n).
In L subframe subsequently, receiving terminal will carry out different processing to special time slot according to the control information indication that the reference sequences that detects identifies, for example, and the reference sequences X that detects
iRepresenting does not have control information in L the follow-up subframe, and then receiving equipment is directly lost the special time slot in these subframes; Otherwise, it is carried out demodulation and obtains certain specific control information.
Fig. 5 illustrates the idiographic flow of the method for a kind of frame structure of processing above-mentioned time-division system of the present invention, and it is used for according to control information indication that above obtains special time slot being processed.The method comprises the following steps: at first, receiving terminal receives wireless signal, according to this subframe Downlink Control Information indication that obtains before special time slot is processed (step 501): if learn this subframe without control information by this Downlink Control Information indication, then abandon this special time slot; Otherwise, process the acquisition baseband signal through the radio frequency unit of receiving terminal; Then, special time slot is carried out frequency shift (FS) calibration (step 502); Then utilize above-mentioned reference sequences X
r(n) each special time slot is carried out channel estimating (step 503); And the configuration parameter that utilizes this channel estimation results and different control information patterns, the value (step 504) of demodulation control information part.Wherein different control information patterns are according to the different control information types in the control information indication and definite, and the configuration parameter of control information pattern is by upper-layer configured, and by the receiver in broadcast channel or the dedicated signaling reporting system.
Fig. 6 illustrates a kind of frame processing device that obtains according to Fig. 4, method shown in Figure 5, comprises radio frequency unit 601, separator 602, conventional time slot processing module 603, special time slot processing module 604 and controller 605.Radio frequency unit 601 receives wireless signals, and the control signal Con that sends according to controller 605 determines whether to abandon special time slot wherein, and conventional time slot and the special time slot that is not dropped are obtained baseband signal through processing; Wherein control signal Con is that controller 605 is exported according to the control information indication of this subframe, and the subframe before the control information indication of this subframe is processed by conventional time slot processing module obtains and export to controller 605 (description).Separator 602 connects radio frequency unit 601, and separates conventional time slot and special time slot (if some words).
Conventional time slot processing module 603 connects this separator 602, conventional time slot is wherein processed, it further comprises frequency offset correction device 603a, sliding correlation detector 603b, peak detection block 603c and channel estimating and data recovery module 603d, wherein frequency offset correction device 603a is in order to carry out frequency offset correction (as shown in Figure 4 step 402), sliding correlation detector 603b and peak detection block 603c detect in order to carry out slip associative operation and peak value respectively, with reference to step 403a shown in Figure 4,403b, at first, with the basic code of the reference symbol of a plurality of cyclically shifted sequences of the basic Zadoff-Chu sequence of this locality and the reception associative operation that slides, these cyclically shifted sequences are set according to the employed a plurality of cyclically shifted sequences of transmitting terminal by the upper strata; Its detailed process is as follows:
Cyclically shifted sequences X with this locality
i(n), n=1,2 ..., N
S, with the reference sequences X that receives
r(n), n=1,2 ... N
S, at [W+X
r(n), W+X
r(n)] associative operation that slides in the window, wherein 2W is that sliding window is long:
Wherein conjugate operation/operation is got in the * representative.Here N
SThe length of expression sequence; Sliding window W according to the concrete condition of multipath transmisstion time delay by default, and take chip as unit.Adopting slides is correlated with is prominent directly main in order to find, thereby eliminates the impact of multipath transmisstion, but not as limit, the present invention still can adopt general associative operation.
Then, the position of the appearance of correlation peak is judged.When detecting peak value U
iThe cyclically shifted sequences X of this locality when (j) occurring
i(n) be in sequence X
r(n) in the time of in the detection window, think that then transmitting terminal has adopted reference sequences X
r(n).
And channel estimating and the data recovery module 603d demodulation (with reference to step 404 shown in Figure 4,405) in order to carry out channel estimating and data division, conventional time slot processing module 603 obtains data division on the one hand, determine on the other hand the reference sequences of the sign control information indication in this routine time slot, wherein each control information indication is to the state information of follow-up L subframe that should subframe, as without control information, the control information type when control information is arranged.
Special time slot processing module 604 connects this separator 602, special time slot processing module 604 comprises frequency offset correction device 604a and channel estimating and control information demodulation module 604b, with reference to step 502 shown in Figure 5～504, at first, special time slot is carried out the frequency shift (FS) calibration; Then utilize above-mentioned reference sequences X
r(n) each special time slot is carried out channel estimating; And the configuration parameter that utilizes this channel estimation results and different control information patterns, the value of demodulation control information part.Wherein different control information patterns are according to the different control information types in the control information indication and definite, and the configuration parameter of control information pattern is by upper-layer configured, and by the receiver in broadcast channel or the dedicated signaling reporting system.
Controller 605 obtains the control information indication INS of this follow-up L subframe from conventional time slot processing module 603
L, preserve this control information indication, be used for processing when this L the subframe that arrives later.In addition, this frame control information indication INS that (such as L subframe before this frame) obtains before controller 605 bases
0, produce control signal Con to radio frequency unit, to determine whether to abandon the special time slot in this frame.
Therefore, by above-described embodiment, the present invention's beneficial effect compared to existing technology is:
The inventive method is utilized a plurality of good circulation autocorrelation performances of cyclically shifted sequences with different cyclic shift number of times of same basic sequence, indicates as Downlink Control Information with different reference sequences.The method can be processed receiving equipment to received signal flexibly, has avoided extra energy loss and processing delay.In the situation that do not increase transmitter and receiving equipment complexity, reduced power consumption and the processing expenditure of receiving equipment.In addition, in the situation that keep spectrum efficiency constant, reduced the expense of terminal.
The present invention is not only applicable to the broadcasting services such as mobile TV of TD-SCDMA system, is applicable to the high-speed downstream broadcasting service of general TDD cdma system yet.
Being preferred embodiment of the present invention only in sum, is not to limit practical range of the present invention.Every equivalence that the content of claim is done according to the present invention changes and modifies, and all should be technology category of the present invention.
Claims (14)
1. one kind arranges the method that control information is indicated in the frame structure of time-division system, this frame structure comprises a plurality of subframes, each subframe comprises a plurality of conventional time slots and at least one special time slot, wherein each conventional time slot comprises reference symbol and data division, each reference symbol comprises basic code and Cyclic Prefix, it is characterized in that, the method comprises:
Use a reference sequences as the basic code of the reference symbol at least one conventional time slot of at least one subframe, wherein this reference sequences is a plurality of cyclically shifted sequences with different cyclic shift number of times that are selected from same basic sequence, each cyclically shifted sequences identifies respectively a kind of control information indication, each control information indication is to the state information of follow-up L the subframe of follow-up L frame that should frame or this at least one subframe, and wherein L is positive integer.
2. the method for claim 1 is characterized in that, described each state information comprises: without control information, the type of control information when control information is arranged.
3. the method for claim 1 is characterized in that, this basic sequence is the Zadoff-Chu sequence.
4. the method for claim 1 is characterized in that, this reference symbol is one of them of leading reference symbol, middle reference symbol and rearmounted reference symbol.
5. the method for claim 1 is characterized in that, the interval of the cyclic shift number of times of each cyclically shifted sequences is greater than the length of multidiameter delay.
6. processing method with time division system frame of control information indication, be suitable for obtaining the control information indication from the frame structure that receives, and carry out frame according to the control information indication that obtains and process, this time division system frame has a plurality of subframes, it is characterized in that, the method comprises the following steps:
Receive a wireless signal, obtain its baseband signal through processing;
Each conventional time slot is carried out the frequency shift (FS) calibration;
The basic code based on the reference symbol of a plurality of cyclically shifted sequences of same basic sequence and reception with this locality mates, to determine the reference sequences of the employed sign control information indication of this reference symbol, wherein this control information indication is to the state information of follow-up L the subframe of follow-up L frame that should time division system frame or its subframe, and L is positive integer;
Utilize this reference sequences that each conventional time slot is carried out channel estimating;
Utilize channel estimation results, the value of the data division of each conventional time slot of demodulation;
Receive this wireless signal, according to this frame control information indication that obtains in advance special time slot is processed: if learn this frame without control information by this control information indication, then abandon this special time slot; Otherwise, obtain baseband signal through processing.
7. method as claimed in claim 6 is characterized in that, the step of mating with the basic code of the reference symbol of local a plurality of cyclically shifted sequences and reception comprises:
Respectively with the basic code of the reference symbol of these cyclically shifted sequences and the reception associative operation that slides;
Detect the correlation peak in the described associative operation, the reference sequences that the local cyclically shifted sequences that this peak value is corresponding adopts for the wireless signal that receives.
8. method as claimed in claim 6 is characterized in that, described basic sequence is the Zadoff-Chu sequence.
9. method as claimed in claim 6 is characterized in that, described each state information comprises: without control information, the type of control information when control information is arranged.
10. method as claimed in claim 6 is characterized in that, receives this wireless signal, also comprises the following steps: after according to this frame control information indication that obtains in advance special time slot being processed
Special time slot is carried out the frequency shift (FS) calibration;
Utilize described reference sequences that each special time slot is carried out channel estimating; And
The configuration parameter of the control information pattern of utilizing channel estimation results and determining according to different control information types, the value of demodulation control information part.
11. the treatment facility with time division system frame of control information indication, this time division system frame has a plurality of subframes, it is characterized in that this treatment facility comprises:
Radio frequency unit receives wireless signal, and whether decision abandons special time slot wherein according to a control signal, if wherein learn this frame without control information by this control information indication, then abandons this special time slot; And conventional time slot and the special time slot that is not dropped obtained baseband signal through processing;
Separator connects this radio frequency unit, separates conventional time slot and special time slot;
Conventional time slot processing module, connect this separator, this routine time slot is processed with the acquired information data, and mate with the basic code of the reference symbol of local a plurality of cyclically shifted sequences based on same basic sequence and reception, to determine the reference sequences of the employed sign control information indication of this reference symbol, wherein each control information indication is to the state information of follow-up L the subframe of follow-up L frame that should time division system frame or its subframe, and L is positive integer;
The special time slot processing module connects this separator, this special time slot is processed, with the value of demodulation control information part; And
Controller obtains the control information indication of this subsequent frame from conventional time slot processing module, and this controls signal to this radio frequency unit to indicate output according to the control information of this frame.
12. equipment as claimed in claim 11 is characterized in that, this routine time slot processing module comprises:
Sliding correlation detector is respectively with the basic code based on the reference symbol of a plurality of cyclically shifted sequences of same basic sequence and reception of the described this locality associative operation that slides;
Peak detection block detects the correlation peak in the described associative operation, determines the reference sequences that local cyclically shifted sequences corresponding to this peak value adopts for the wireless signal that receives.
13. such as claim 11 or 12 described equipment, it is characterized in that, described basic sequence is the Zadoff-Chu sequence.
14. equipment as claimed in claim 11 is characterized in that, described each state information comprises: without control information, the type of control information when control information is arranged.
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| WO2016206652A2 (en) * | 2015-06-23 | 2016-12-29 | 中兴通讯股份有限公司 | Wireless signal transmission method and system |
| CN106304357B (en) | 2015-06-23 | 2021-11-09 | 中兴通讯股份有限公司 | Wireless signal transmission method and system |
Citations (3)
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|---|---|---|---|---|
| WO2000060815A2 (en) * | 1999-03-23 | 2000-10-12 | Net Insight Ab | Information transfer in time-multiplexed communication network where an additional bit is used as a flag for indicating the existence of control information regarding a time slot associated with the additional bit |
| CN1607787A (en) * | 2003-07-28 | 2005-04-20 | 凯明信息科技股份有限公司 | Automatic frequency correcting method for time-division wireless communication system |
| CN1725870A (en) * | 2004-07-23 | 2006-01-25 | 华为技术有限公司 | Method of implementing quick paging |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000060815A2 (en) * | 1999-03-23 | 2000-10-12 | Net Insight Ab | Information transfer in time-multiplexed communication network where an additional bit is used as a flag for indicating the existence of control information regarding a time slot associated with the additional bit |
| CN1607787A (en) * | 2003-07-28 | 2005-04-20 | 凯明信息科技股份有限公司 | Automatic frequency correcting method for time-division wireless communication system |
| CN1725870A (en) * | 2004-07-23 | 2006-01-25 | 华为技术有限公司 | Method of implementing quick paging |
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