CN101400120B - Control information mode configuring method for time division system, method and device for processing received frame - Google Patents

Control information mode configuring method for time division system, method and device for processing received frame Download PDF

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CN101400120B
CN101400120B CN2007100465615A CN200710046561A CN101400120B CN 101400120 B CN101400120 B CN 101400120B CN 2007100465615 A CN2007100465615 A CN 2007100465615A CN 200710046561 A CN200710046561 A CN 200710046561A CN 101400120 B CN101400120 B CN 101400120B
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control information
levels
time interval
transmission time
sequence
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CN101400120A (en
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吴涛
师延山
石璟
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Spreadtrum Communications Shanghai Co Ltd
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    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract

The invention relates to a time division system control information mode arrangement method, a frame receiving process method and a device, wherein the arrangement method is used to arrange the control information mode for TTI with a plurality of sub-frames, the method comprises: using a reference sequence as a basic code of a reference mark in at least a routine time slot of each sub-frame in TTI, wherein the reference sequence is selected from a plurality of optional reference sequences mapped into different levels, the reference sequence of each sub-frame in TTI is mapped into each level constituting a level sequence, which identifies control information mode of next L-th TTI, L is an integer. The invention causes the receiving device to perform agile process on the received signals, thereby avoiding extra energy loss and processing delay, to perform TTI synchronization.

Description

Time-division system control information mode configuration method, received frame processing method and equipment
Technical field
The present invention relates to the time division communication system technical field, relate in particular to the collocation method of control information pattern in the time-division system, at processing method and the equipment of receiving terminal received frame with control information pattern.
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, Here it is multiple frequency network, MFN (Multi-Frequency Network, MFN) mode.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.(Single Frequency Network SFN) is meant that the same time of several transmitting stations launch same signal on same frequency, with the reliable covering of realization to certain service area to so-called single frequency network.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 big bandwidth of need, this advantage is more outstanding.The diversity that a plurality of transmitting station synchronous workings are brought makes that also the reliability that receives is enhanced, and obtains better program coverage rate.In addition, by adjustment and optimization to transmit network (as the height of the quantity of transmitter, distribution, individual transmitter, transmitting power etc.), also can reduce total power consumption, alleviate interference, even change the distribution of overlay area as required easily and flexibly near other networks.
The proposition and the multi-carrier modulation of single frequency network interrelate, for example OFDM (Orthogonal Frequency Division Multiplexing, OFDM).(Long Term Evolution LTE) in the standard of being worked out, has introduced OFDM to the Long Term Evolution project of 3GPP normal structure, adopts 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 handle.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 synchronization that sends, 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 sub-districts 100 1-100 Z(being designated as 100) constitutes, and a base station (Node B) 101 is wherein respectively arranged in each sub-district 1-101 Z(being designated as 101), there is the user terminal (UE) 102 of some in the while in this sub-district 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 controlled and is managed by radio network controller (RNC) 103 again.By base station 101, radio network controller 103 and other network element devices together, just constituted land radio access web (UTRAN) 110.
TD-SCDMA is a part of 3G standard.There are a plurality of carrier resources a sub-district 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 (1.28 Mcps) among 3G collaborative project (3GPP) the standard TS 25.221 (Release 4).The spreading rate of TD-SCDMA system is 1.28 Mcps, 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; 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 set up initial uplink and downlink respectively.
TS0～TS6 time slot 202 0-202 6Length is 0.675ms or 864 chips, wherein comprise data segment Data Part1 (208) and Data Part 2 (210) that two segment lengths are 352 chips, and a middle segment length is the reference symbol of 144 chips---in lead sign indicating number (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.
The protection that descending pilot frequency time slot 203 comprises 32 chips at interval 211 and one long be descending synchronous code (SYNC-DL) code word 206 of 64 chips, its effect is cell ID and sets up initial synchronisation; And go up 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.
Broadcast type multimedia services such as mobile TV belong to downlink broadcast class business.In order to provide more multimedia service on a carrier wave, a kind of complete descending special carrier technology is suggested, and promptly all time slots on carrier wave are descending time slot.Special carrier among the TD-SCDMA can be formed 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 (GP) 204 are merged into the crack in short-term 302 that length is 352 chips 1(for sake of convenience, crack 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 crack in short-term of long time slot all is made of leading reference symbol (PreAmble) 309 and data division (Data Part); Wherein the data division of long time slot is (as 308 6) length is 752 chips, the crack 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) (PACode) 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, so that adapt to the big situation of SFN network multi-path time delay.When Cyclic Prefix 313 was usually designed to 32 chips, leading reference symbol 309 can be shorter when being designed to 48 chips, and correspondingly, the data division in the time slot can take more chips.
In addition, by with leading reference symbol 309 separated into two parts, the technical scheme that is put into time slot 302 two ends also is suggested, and changing the distribution of time slot internal reference symbol, and then changes performance for estimating channel in the time slot.
Information exchange between MAC (medium access control) layer and the physical layer is that unit carries out with TTI (Transmission Time Interval).For traditional TD-SCDMA, the common several times that TTI is wireless frame length (10ms).System can be selectively sends control information at the time slot 310 of different subframes, i.e. the 310 transmitting system control informations of time slot in some TTI (comprising dissimilar control informations such as broadcasting, paging), and in other TTI, 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, receiver need be known the type that whether has control information and control information among each TTI.
Therefore, make receiving equipment can obtain indication, each TTI is carried out respective handling according to actual conditions, will handle time-delay and power consumption aspect unnecessary spending for receiving equipment reduces to a certain extent if can design a kind of easy method.In addition, in order correctly to recover control information and the business datum that system sends at receiving terminal, also need TTI is carried out promptly finding each TTI from which radio frames synchronously.
In sum, for the mobile TV class broadcasting service on the special carrier, the TD-SCDMA system need increase a kind of method and solve above-mentioned these two problems: 1. control information type indication, 2.TTI is synchronous.
Summary of the invention
An object of the present invention is to provide a kind of method that in time-division system, disposes the control information pattern, by control information pattern and TTI synchronizing information, receiving equipment can be handled in view of the above to received signal flexibly, avoid extra energy loss and handle time-delay, and the TTI that carries out in case of necessity is synchronous.
Another object of the present invention provides the processing method of received frame in a kind of time-division system, be used for obtaining control information pattern and TTI synchronizing information from received signal, be convenient to that handle flexibly to the special time slot of follow-up each subframe of TTI the back and in case of necessity TTI is synchronous, avoid extra energy loss and handle time-delay.
Another purpose of the present invention provides a kind of method of utilizing the control information mode treatment received frame of acquisition, handles flexibly according to the control information pattern that obtains, and delay time to avoid extra energy loss and processing, and the TTI that carries out in case of necessity is synchronous.
A further object of the present invention provides the receiving equipment in a kind of time-division system, its reception has the signal of control information pattern, the control information pattern that obtains is wherein also handled the special time slot of follow-up each subframe of TTI in view of the above flexibly, avoid extra energy loss and handle time-delay, and the TTI that carries out in case of necessity is synchronous.
For achieving the above object, the invention provides a kind of method that in time-division system, disposes the control information pattern, in order to the Transmission Time Interval configuration control information pattern that has a plurality of subframes to, this method comprises: use the basic code of reference sequences as reference symbol at least one conventional time slot of each subframe in the Transmission Time Interval, this reference sequences is to be selected from a plurality of optional reference sequences that are mapped as varying level, reference sequences in each subframe of this Transmission Time Interval maps to each level of forming a sequence of levels one by one, this sequence of levels identifies the control information pattern of follow-up L the Transmission Time Interval of this Transmission Time Interval, and wherein L is a positive integer.
In the above-mentioned method, these optional reference sequences have good autocorrelation and cross correlation.
In the above-mentioned method, the kind of level can be 2～4.
In the above-mentioned method, the control information pattern comprises: no control information and control information is arranged, the type of control information when perhaps comprising no control information and control information being arranged.
The present invention provides the processing method of received frame in a kind of time-division system in addition, is suitable for obtaining from received signal at receiving terminal the control information pattern of each Transmission Time Interval, and this method may further comprise the steps:
A. obtain the subframe in the Transmission Time Interval;
B. mate with the local a plurality of optional reference sequences and the reference sequences of reception, with the reference sequences of determining that received signal is used;
C. detected this reference sequences of current subframe is mapped as a level, it is N that mapping result is stored in length TTIBuffer memory in;
D. the number of levels when buffer memory reaches N TTIThe time, it is synchronous to judge whether receiving terminal has finished Transmission Time Interval, if it is synchronous to have finished Transmission Time Interval, is N with length in the buffer memory then TTIDetection sequence of levels and one group of predetermined many sequence of levels make simple correlation, if it is synchronous not finish Transmission Time Interval, it is relevant then will to detect many sequence of levels dos slip that sequence of levels and this group be scheduled to; And
E. definite is the control information pattern of follow-up L the Transmission Time Interval of this Transmission Time Interval with these corresponding predetermined many sequence of levels that detect the sequence of levels correlation peak, and L is a positive integer.
Wherein, this step b comprises: with local optional reference sequences and the reference sequences in the current subframe associative operation that slides; Detect maximum slip correlation peak, the sequence of this peak value correspondence is the reference sequences that current subframe adopts; Wherein, reference sequences has good autocorrelation and cross correlation.
In the above-mentioned method, if the number of levels in the buffer memory is less than N TTI, then wait for next subframe of this Transmission Time Interval, carry out restarting from step a.
In the above-mentioned method, also be included in obtain this control information pattern after, empty this buffer memory.
In the above-mentioned method, this control information pattern comprises: no control information and control information is arranged, the type of control information when perhaps comprising no control information and control information being arranged.
In the above-mentioned method, this simple correlation operation is to carry out in accordance with the following methods:
Z k = Σ n = 1 N TTI Y r ( n ) · Y k * ( n )
Wherein, Y r(n) expression detects sequence of levels, Y kRepresent each predetermined many sequence of levels, k=1 ..., K, K are the quantity of control information pattern, * represents Y kGet conjugate operation, detect sequence of levels Y with this r(n) maximum related value Z kThe control information pattern of corresponding corresponding a kind of follow-up L the Transmission Time Interval of predetermined many sequence of levels, wherein L is a positive integer.In the above-mentioned method, this slip associative operation is to carry out in accordance with the following methods:
Z ( q ) k = Σ n = 1 N TTI Y r ( n ) · Y k * [ ( n - q ) mod N TTI ] ,
Wherein, Y r(n) expression detects sequence of levels, Y kRepresent each predetermined many sequence of levels, k=1 ..., K, K are the quantity of control information pattern, * represents Y kGet conjugate operation, correlation peak Z (q) kThe control information pattern of corresponding corresponding a kind of follow-up L the Transmission Time Interval of predetermined many sequence of levels, the displacement number q of this peak value correspondence represents that first subframe of Transmission Time Interval appears at current q the subframe place that receives.
The present invention also provides a kind of method of utilizing the control information mode treatment received frame that obtains above, comprise: at first, receive wireless signal, control information pattern according to this Transmission Time Interval that obtains is before handled the special time slot of each subframe in this Transmission Time Interval: if there is not control information, then abandons described special time slot and do not do any subsequent treatment; Otherwise, obtain baseband signal through handling; Then each special time slot is carried out the frequency shift (FS) calibration; Secondly, utilize the reference sequences that receives that each special time slot is carried out channel estimating; Afterwards, utilize the configuration parameter of channel estimation results and described control information pattern, the value of demodulation control information part; And recover control information in this Transmission Time Interval according to the Transmission Time Interval synchronizing information.
The present invention also provides the receiving equipment in a kind of time-division system, be suitable for the received frame with control information pattern is handled, this equipment comprises: radio frequency unit, receive wireless signal, whether decision abandons the special time slot of each subframe in this Transmission Time Interval according to a control signal, and the conventional time slot of each subframe and the special time slot that is not dropped are obtained baseband signal through handling; Separator connects this radio frequency unit, separates described conventional time slot and special time slot; Conventional time slot processing module, connect this separator, detect the reference sequences that adopts in the conventional time slot of each subframe in this Transmission Time Interval, and it is carried out level mapping respectively obtain one and detect sequence of levels, and export the subsequent transmission time interval controls information pattern that this detection sequence of levels is identified; The special time slot module connects this separator, the special time slot of each subframe in this Transmission Time Interval is handled, with the value of demodulation control information part; And controller, connect this routine time slot processing module and this radio frequency unit, obtain the control information pattern in this subsequent transmission time interval from this routine time slot processing module, and export this according to the control information pattern of this Transmission Time Interval and control signal to this radio frequency unit.
In the above-mentioned equipment, this routine time slot processing module can comprise: sliding correlation detector, with local optional reference sequences and the reference sequences in the current subframe associative operation that slides; And peak detector, detecting maximum slip correlation peak, the sequence of this peak value correspondence is the reference sequences that current subframe adopts; Wherein, reference sequences has good autocorrelation and cross correlation.
In the above-mentioned equipment, this routine time slot processing module further comprises: the level mapping block, connect this peak detector, and the current subframe reference sequences that detects is mapped as a level respectively; Buffer memory is in order to the level that reference sequences shone upon of each subframe of buffer memory; And correlator, connect this buffer memory, when the number of levels of buffer memory reaches buffer storage length, whether having finished Transmission Time Interval according to receiving equipment selects the detection sequence of levels in the buffer memory and one group of predetermined many sequence of levels are made corresponding associative operation synchronously, and determining to detect corresponding one of sequence of levels correlation peak with this, to be scheduled to many sequence of levels be the control information pattern of follow-up L the Transmission Time Interval of this Transmission Time Interval, and L is a positive integer.
In the above-mentioned equipment, this control information pattern comprises no control information and control information is arranged, the type of control information when perhaps comprising no control information and control information being arranged.
In the above-mentioned equipment, if it is synchronous to have finished Transmission Time Interval, this correlator is according to formula
Figure DEST_PATH_GSB00000221561600031
Carry out associative operation, wherein, Y r(n) expression detects sequence of levels, Y kRepresent each predetermined many sequence of levels, k=1 ..., K, K are the quantity of control information pattern, detect sequence of levels Y with this r(n) maximum related value Z kThe control information pattern of corresponding corresponding a kind of follow-up L the Transmission Time Interval of predetermined many sequence of levels, wherein L is a positive integer.
In the above-mentioned equipment, if it is synchronous not finish Transmission Time Interval, then this correlator is according to formula
Figure DEST_PATH_GSB00000221561600032
Carry out the slip associative operation, wherein, Y r(n) expression detects sequence of levels, Y kRepresent each predetermined many sequence of levels, k=1 ..., K, K are the quantity of control information pattern, correlation peak Z (q) kThe control information pattern of corresponding corresponding a kind of follow-up L the Transmission Time Interval of predetermined many sequence of levels, the displacement number q of this peak value correspondence represents that first subframe of Transmission Time Interval appears at current q the subframe place that receives.
Therefore, by such scheme of the present invention, the invention has the beneficial effects as follows:
The present invention utilizes the good autocorrelation performance of reference sequences, as the Downlink Control Information indicator, and distinguishes follow-up TTI inner control pattern and carry out TTI synchronous by the different collating sequences of indicator in the TTI with different reference sequences.The present invention can handle receiving equipment to received signal flexibly, has avoided extra energy loss and processing delay.Under the situation that does not increase transmitter and receiving equipment complexity, reduced the power consumption and the processing expenditure of receiving equipment.In addition, keeping having reduced the expense of terminal under the constant situation of spectrum efficiency.
Description of drawings
Fig. 1 is the rough schematic of typical cell mobile communication systems.
Fig. 2 is a 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 flow chart of the present invention to the processing method of the conventional time slot of each TTI.
Fig. 5 is the flow chart of the present invention to the processing method of the special time slot of each TTI.
Fig. 6 is the structural representation of receiving equipment of the present invention.
Embodiment
Subframe structure for TD-SCDMA special carrier shown in Figure 3.System will send control information at some TTI selectively.Realize simultaneously that in order to allow receiver carry out different processing at different control information patterns neatly TTI is synchronous, need simple and easy to do method of design that receiving equipment is indicated.
Still the subframe structure with TD-SCDMA special carrier shown in Figure 3 is that example describes, but those skilled in the art as can be known, this is an example of TD-SCDMA subframe 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 all arranged, comprise reference symbol part and information data part.Reference symbol generally is made up 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.
At first, because the very high cross-correlation of auto-correlation peak value of reference sequences then is the less random value of similar noise, can be used as the control information indicator with different reference sequences.Particularly, in a subframe, select for use reference symbol in the conventional time slot of N (N＞0) individual regulation as the control information indicator, specifically select which time slot for use, by system's upper strata decision, the selection of time slot is by upper-layer configured, and by the receiver in broadcast channel or the dedicated signaling reporting system.For instance, when selecting a time slot for use, select TS0 time slot 302 for use 0Reference symbol as the control information indicator.In selected time slot (as time slot TS0), the unified basic code of a specific reference sequences as the reference symbol, this specific reference sequences taked is from P (P is a positive integer) of system's regulation optional reference sequences S i(n) select in.
In an embodiment of the present invention, P selected reference sequences S of the basic code of reference symbol i(n) can be pseudo random sequences such as Zadoff-Chu sequence, Gold sequence and M sequence.For instance, can choose P different M sequence as the reference sequence, wherein the generation of these M sequences has been a technique known, does not repeat them here.It will be understood by those skilled in the art that, available reference sequences is not as limit, so long as have the sequence of good autocorrelation and cross correlation, it is very high and cross-correlation and auto-correlation peak value are in a ratio of the sequence of very little value all can use promptly to satisfy the auto-correlation peak value.
Secondly, determine number of reference sequences according to the kind of required state information, and P different reference sequences S i(n) be mapped to the different level of P kind.For example: have under the situation of two optional reference sequences these two sequences are corresponding respectively 0,1 two level; There are under the situation of three optional reference sequences these two sequences are corresponding respectively 0,1,2 three level; There are under the situation of four optional reference sequences these four sequences are corresponding respectively 0,1,2,3 four level.Below only for for example, in fact, when the time slot format that adopts some company to propose exists when sending two kinds of situations with reference to sequence simultaneously, above-mentioned level value can be more.In addition, each level value is an illustrative purposes only also, is not as limiting.
Accept above-mentionedly, can shine upon and become a specific level value owing to be used to refer to reference sequences that the particular time-slot (perhaps particular time-slot collection) of control information adopts in each subframe, and comprise N among the TTI (Transmission Time Interval) TTI(N TTI=TTI/ subframe lengths) individual subframe, just to have constituted a length be N to these level values so TTIMany sequence of levels Y k(n), k=1 ..., K; N=1 ..., N TTI, wherein k represents different many sequence of levels, and different many sequence of levels are respectively in order to represent different control information patterns.By being N to K length K control information pattern TTIThe coding mapping of many-valued sequence, be N with different length TTIThe different control information pattern of K kind of the individual TTI of many sequence of levels sign back L (L＞0).Whether these control information patterns for example comprise 2 kinds of patterns of control information, the type various modes of control information when perhaps comprising no control information and control information being arranged.
Therefore, a kind of method that disposes the control information pattern in time-division system of the present invention is described below: use reference sequences as N among the TTI TTIThe basic code of reference symbol at least one conventional time slot of individual subframe, wherein, this reference sequences is to be selected from a plurality of different optional reference sequences, these optional reference sequences have good autocorrelation and cross correlation to make and can be distinguished mutually between them.In addition, these different optional reference sequences can be mapped as different level.Make the reference sequences in each subframe of a TTI map to each level of forming a sequence of levels one by one, this K length is N TTISequence of levels Y k(n), k=1 ..., K; N=1 ..., N TTIIdentify the K kind control information pattern of follow-up L the TTI of this TTI, wherein L is a positive integer.
Above-mentioned parameter L is a positive integer, its size can be configured according to the system design needs, the disposal ability of main reference receiver, stronger as the receiver disposal ability, then get less value, as L=1, this means that receiving terminal handles the special time slot of next TTI according to the control information pattern of this TTI, otherwise, as the receiver disposal ability a little less than, then get bigger value, to reserve enough buffer time.
In the present invention, sequence of levels Y k(n) coding method of Cai Yonging should be able to guarantee that relative distance is enough big between each sequence of levels, so that can distinguish variant sequence of levels when decoding.These coding methods belong to conventional art, for example adopt the Reed-Solomon coding to wait piece multivalued encoding scheme, and wherein each different sequence of levels can be distinguished with the maximum-likelihood decoding method, and correlation method is a kind of good maximum-likelihood decoding method.If adopt two level codings simply, then can select the Walsh sign indicating number.
Like this, receiving terminal can obtain above-mentioned sequence of levels, this sequence of levels is carried out coherent detection obtain the control information pattern.In addition, when needs carry out TTI when synchronous, testing process is slided relevant to the sequence of levels that detects with local predetermined many sequence of levels, not only can determine the sequence of levels that adopts, and can realize that TTI's is synchronous according to the shift position that peak value occurs.
Be described in the method that receiving terminal is handled the received frame with above sequence of levels feature below with reference to Fig. 4, at first, according to the conventional method, in step 401, receive wireless signal, obtain baseband signal through radio frequency processing, wherein, can obtain each subframe of TTI successively in this step as if being unit with a TTI; And, the conventional time slot of each subframe is carried out the frequency shift (FS) calibration in step 402.Then, execution in step 403 is with local a plurality of optional reference sequences S i(n) with the reference sequences S that receives r(n) mate, with the reference sequences of determining that received signal is used, wherein these optional reference sequences are set by the upper strata, and it is for example identical with transmitting terminal, and this step further comprises:
Step 403a is with local reference sequences S i(n), n=1,2 ..., N S, with the reference sequences S that receives r(n), n=1,2 ..., N S, associative operation slides in the window of [W, W]:
U i ( j ) = Σ i = 1 N s S r ( n ) · S i * ( ( n - j ) mod N S ) , j＝-W，...，-1，0，1，...，W
Wherein *Expression is got conjugate operation/computing to Si, and this is to consider that sequence is the situation of plural number.Here N SThe length of expression reference sequences; Sliding window W by default, and is a unit with the chip according to the concrete condition of multipath transmisstion time delay.Adopt sliding relevant is in order to find prominent main footpath, thereby eliminates the influence of multipath transmisstion, but is not as limiting, promptly carrying out general associative operation also within the scope of the invention at this.
Step 403b detects maximum slip correlation peak U i(j), the local reference sequences S of this peak value correspondence i(n) be the reference sequences that current subframe adopts.
Continuation is with reference to Fig. 4, and then, execution in step 404 is with the detected reference sequences S of current subframe i(n) be mapped as a level, it is N that mapping result is stored in length TTIBuffer memory in.Afterwards, step 405 judges whether the number of levels of buffer memory reaches N TTI, when the number of levels of buffer memory does not reach N TTIThe time, directly execution in step 409 and 410 waits for that then next subframe arrives, to restart execution from step 401.
When the number of levels of buffer memory reaches N TTIThe time, execution in step 406 judges whether TTI is synchronous, if synchronous, then enters step 407, is N with length in the buffer memory TTIDetection sequence of levels Y r(n) with one group of many sequence of levels Y that is scheduled to by system k(n), k=1 ..., K; Do relevant and the searching peak value:
Z k = Σ i = 1 N TTI Y r ( n ) · Y k * ( n )
Wherein *Expression is to Y kGet conjugate operation/computing.Detect sequence of levels Y with this r(n) maximum related value Z kCorresponding predetermined many sequence of levels according to system's regulation corresponding the control information pattern of follow-up L TTI of this TTI, wherein L is a positive integer.This means that L follow-up TTI will take this pattern to send control information.
After step 407, execution in step 408 empties buffer memory.
In addition, according to conventional method, utilize reference sequences S in step 409 i(n) each conventional time slot of current subframe is carried out channel estimating.And step 410, utilize channel estimation results, the value of data division in the conventional time slot of demodulation.
On the other hand, do not obtain to enter step 407a under the TTI synchronous situation at receiving terminal, different with step 407 is, the slip associative operation of Zhi Hanging therefrom can obtain the TTI synchronizing information herein, and detailed process is as follows:
Is length in the buffer memory N TTISequence Y r(n) with one group of predetermined sequence Y k(n) doing slip is correlated with:
Z ( q ) k = Σ i = 1 N TTI Y r ( n ) · Y k * [ ( n - q ) mod N TTI ]
Wherein *Expression is to Y kGet conjugate operation/computing, this is to consider that sequence is the situation of plural number.Detect sequence of levels Y with this r(n) maximum related value Z (q) kCorresponding sequence Y k(n) according to system regulation corresponding the control information state model of follow-up L TTI of this TTI, this means that L follow-up TTI will take this pattern to send control information.Simultaneously, this peak value Z (q) kCorresponding displacement number q has then provided the TTI synchronizing information, and promptly first subframe of TTI should appear at current q the subframe place that receives, thereby it is synchronous to have finished TTI.
After finishing above-mentioned steps 407a, enter the step 408 that empties buffer memory.
Below with reference to Fig. 5 a kind of method of utilizing the control information mode treatment received frame of above-mentioned acquisition is described, at first, execution in step 501, receive wireless signal, control information pattern according to this TTI that obtains is before handled the special time slot of each subframe in this TTI: if there is not control information, then abandons this special time slot and do not do any subsequent treatment; Otherwise, obtain baseband signal through radio frequency processing; Then enter step 502, each special time slot is carried out the frequency shift (FS) calibration; Execution in step 503 then, utilize the reference sequences S that receives i(n) each special time slot is carried out channel estimating; Afterwards, enter step 504, utilize the configuration parameter of channel estimation results and above-mentioned control information pattern, the value of demodulation control information part; When system does not obtain TTI when synchronous as yet, also comprise step 505, recover control information in this TTI according to the TTI synchronizing information.
Fig. 6 illustrates a kind of receiving equipment 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 whether the control signal Con decision of being sent according to controller 605 abandons the special time slot of each subframe among this TTI, and conventional time slot and the special time slot that is not dropped are obtained baseband signal through handling; Wherein control signal Con is the control information pattern output of controller 605 according to this TTI, and the TTI before the control information pattern of this TTI is handled by conventional time slot processing module 603 obtains and export to controller 605 (description).Separator 602 connects radio frequency unit 601, and separates conventional time slot and special time slot (if the words that have).
Conventional time slot processing module 603 connects this separator 602, conventional time slot is wherein handled, it further comprises frequency offset correction device 603a, sliding correlation detector 603b, peak detection block 603c, level mapper 603d, buffer memory 603e, correlator 603f and channel estimating and data recovery module 603g, wherein frequency offset correction device 603a is in order to carry out frequency offset correction (step 402 as shown in Figure 4), 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 local reference sequences S i(n), n=1,2 ..., N S, with the reference sequences S that receives r(n), n=1,2 ..., N S, associative operation slides in the window of [W, W]:
U i ( j ) = Σ i = 1 N s S r ( n ) · S i * ( ( n - j ) mod N S ) , j＝-W?，...，-1，0，1，...，W
Wherein *Expression is to S iGet conjugate operation/computing.Here N SThe length of expression reference sequences; Sliding window W by default, and is a unit with the chip according to the concrete condition of multipath transmisstion time delay.Adopt sliding relevant is in order to find prominent main footpath, thereby eliminates the influence of multipath transmisstion, but is not as limiting, promptly carrying out general associative operation also within the scope of the invention at this.
Then, detect maximum slip correlation peak U i(j), the local reference sequences S of this peak value correspondence i(n) be the reference sequences that current subframe adopts.
Afterwards, level mapper 603d is with the detected reference sequences S of current subframe i(n) be mapped as a level, it is N that mapping result is stored in length TTIBuffer memory 603e in.When the number of levels of buffer memory does not reach N TTIThe time, then carry out channel estimating and data demodulates operation by channel estimating and data recovery module 603g, wait for that then new subframe arrives.
When the number of levels of buffer memory reaches N TTIThe time, synchronous if receiving equipment has obtained TTI, then decoding with correlator 603f in buffer memory 603e in length be N TTIDetection sequence of levels Y r(n) with one group of many sequence of levels Y that is scheduled to by system k(n), k=1 ..., K; Do relevant and the searching peak value:
Z k = Σ i = 1 N TTI Y r ( n ) · Y k * ( n )
Wherein *Expression is to Y kGet conjugate operation/computing.Detect sequence of levels Y with this r(n) maximum related value Z kCorresponding predetermined many sequence of levels according to system's regulation corresponding the control information pattern MOD of follow-up L TTI of this TTI L, wherein L is a positive integer.This control information pattern MOD LBe exported to controller 605.After obtaining the control information pattern, empty buffer memory 603e.
In addition, channel estimating and data recovery module 603g utilize reference sequences S according to conventional method i(n) each conventional time slot of current subframe is carried out channel estimating, and utilize channel estimation results, the value of data division in the conventional time slot of demodulation.
On the other hand, do not obtain under the TTI synchronous situation at receiving terminal, correlator 603f is length in the buffer memory N TTISequence Y r(n) with one group of predetermined sequence Y k(n) doing slip is correlated with:
Z ( q ) k = Σ i = 1 N TTI Y r ( n ) · Y k * [ ( n - q ) mod N TTI ]
Wherein *Expression is to Y kGet conjugate operation/computing.Detect sequence of levels Y with this r(n) maximum related value Z (q) kCorresponding sequence Y k(n) according to system regulation corresponding the control information state model MOD of follow-up L TTI of this TTI LSimultaneously, this peak value Z (q) kCorresponding displacement number q has then provided the TTI synchronizing information, and promptly first subframe of TTI should appear at current q the subframe place that receives, thereby it is synchronous to have finished TTI.After this, empty buffer memory 603e.
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, special time slot according to each subframe in couple TTI of step 502 shown in Figure 5～505 is handled, with the value of demodulation control information part.
Controller 605 obtains the control information pattern MOD of follow-up L TTI from conventional time slot processing module 603 L, preserve this control information pattern, be used for handling as this L the TTI that arrives later.In addition, this TTI control information pattern MOD that (as L TTI before this TTI) obtains before controller 605 bases 0, produce control signal Con and give radio frequency unit 601, whether abandon the special time slot of each subframe among this TTI with decision.
Therefore, by the above embodiment of the present invention, the invention has the beneficial effects as follows:
The present invention utilizes the good autocorrelation performance of reference sequences, as the Downlink Control Information indicator, and distinguishes follow-up TTI inner control pattern and carry out TTI synchronous by the different collating sequences of indicator in the TTI with different reference sequences.The present invention can handle receiving equipment to received signal flexibly, has avoided extra energy loss and processing delay.Under the situation that does not increase transmitter and receiving equipment complexity, reduced the power consumption and the processing expenditure of receiving equipment.In addition, keeping having reduced the expense of terminal under the constant situation of spectrum efficiency.
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 be used for limiting 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 (18)

1. the method for a configuration control information pattern in time-division system disposes the control information pattern in order to the Transmission Time Interval that has a plurality of subframes to, it is characterized in that this method comprises:
Use the basic code of reference sequences as reference symbol at least one conventional time slot of each subframe in the Transmission Time Interval, this reference sequences is to be selected from a plurality of optional reference sequences that are mapped as varying level, reference sequences in each subframe of this Transmission Time Interval maps to each level of forming a sequence of levels one by one, this sequence of levels identifies the control information pattern of follow-up L the Transmission Time Interval of this Transmission Time Interval, and wherein L is a positive integer.
2. the method for claim 1 is characterized in that, described optional reference sequences has good autocorrelation and cross correlation.
3. the method for claim 1 is characterized in that, the kind of described level is 2～4.
4. the method for claim 1 is characterized in that, this control information pattern comprises: no control information and control information is arranged, the type of control information when perhaps comprising no control information and control information being arranged.
5. the processing method of received frame in the time-division system is suitable for obtaining from received signal at receiving terminal the control information pattern of each Transmission Time Interval, it is characterized in that this method may further comprise the steps:
A. obtain the subframe in the Transmission Time Interval;
B. mate with the local a plurality of optional reference sequences and the reference sequences of reception, with the reference sequences of determining that received signal is used;
C. detected this reference sequences of current subframe is mapped as a level, it is N that mapping result is stored in length TTIBuffer memory in;
D. the number of levels when buffer memory reaches N TTIThe time, it is synchronous to judge whether receiving terminal has finished Transmission Time Interval, if it is synchronous to have finished Transmission Time Interval, is N with length in the buffer memory then TTIDetection sequence of levels and one group of predetermined many sequence of levels make simple correlation, if it is synchronous not finish Transmission Time Interval, it is relevant then will to detect many sequence of levels dos slip that sequence of levels and this group be scheduled to; And
E. definite is the control information pattern of follow-up L the Transmission Time Interval of this Transmission Time Interval with these corresponding predetermined many sequence of levels that detect the sequence of levels correlation peak, and L is a positive integer.
6. method as claimed in claim 5 is characterized in that, this step b comprises:
With the optional reference sequences of this locality and the reference sequences in the current subframe associative operation that slides;
Detect maximum slip correlation peak, the local reference sequences of this peak value correspondence is the reference sequences that current subframe adopts; Wherein,
Described reference sequences has good autocorrelation and cross correlation.
7. method as claimed in claim 5 is characterized in that, if the number of levels in the buffer memory is less than N TTI, then wait for next subframe of this Transmission Time Interval, carry out restarting from step a.
8. method as claimed in claim 5 is characterized in that, also be included in obtain this control information pattern after, empty this buffer memory.
9. method as claimed in claim 5 is characterized in that, this control information pattern comprises: no control information and control information is arranged, the type of control information when perhaps comprising no control information and control information being arranged.
10. method as claimed in claim 5 is characterized in that, this simple correlation operation is to carry out in accordance with the following methods:
Z k = Σ n = 1 N TTI Y r ( n ) · Y k * ( n )
Wherein, Y r(n) expression detects sequence of levels, Y kRepresent each predetermined many sequence of levels, k=1 ..., K, K are the quantity of control information pattern, * represents Y kGet conjugate operation, detect sequence of levels Y with this r(n) maximum related value Z kThe control information pattern of corresponding corresponding a kind of follow-up L the Transmission Time Interval of predetermined many sequence of levels, wherein L is a positive integer.
11. method as claimed in claim 5 is characterized in that, this slip associative operation is to carry out in accordance with the following methods:
Z ( q ) k = Σ n = 1 N TTI Y r ( n ) · Y k [ ( n - q ) mod N TTI ] ,
Wherein, Y r(n) expression detects sequence of levels, Y kRepresent each predetermined many sequence of levels, k=1 ..., K, K are the quantity of control information pattern, * represents Y kGet conjugate operation, correlation peak Z (q) kThe control information pattern of corresponding corresponding a kind of follow-up L the Transmission Time Interval of predetermined many sequence of levels, the displacement number q of this peak value correspondence represents that first subframe of Transmission Time Interval appears at current q the subframe place that receives.
12. a method of utilizing the control information mode treatment received frame of each acquisition among the claim 5-11 is characterized in that comprising:
Receive wireless signal, according to the control information pattern of this Transmission Time Interval that obtains before the special time slot of each subframe in this Transmission Time Interval is handled:, then abandon described special time slot and do not do any subsequent treatment if there is not control information; Otherwise, obtain baseband signal through handling;
Each special time slot is carried out the frequency shift (FS) calibration;
Utilize the reference sequences that receives that each special time slot is carried out channel estimating;
Utilize the configuration parameter of channel estimation results and described control information pattern, the value of demodulation control information part; And
Recover control information in this Transmission Time Interval according to the Transmission Time Interval synchronizing information.
13. the receiving equipment in the time-division system is suitable for the received frame with control information pattern is handled, and it is characterized in that this receiving equipment comprises:
Radio frequency unit receives wireless signal, and whether decision abandons the special time slot of each subframe in this Transmission Time Interval according to a control signal, and the conventional time slot of each subframe and the special time slot that is not dropped are obtained baseband signal through handling;
Separator connects this radio frequency unit, separates described conventional time slot and special time slot;
Conventional time slot processing module, connect this separator, detect the reference sequences that adopts in the conventional time slot of each subframe in this Transmission Time Interval, and it is carried out level mapping respectively obtain one and detect sequence of levels, and export the subsequent transmission time interval controls information pattern that this detection sequence of levels is identified;
The special time slot module connects this separator, the special time slot of each subframe in this Transmission Time Interval is handled, with the value of demodulation control information part; And
Controller, connect this routine time slot processing module and this radio frequency unit, obtain the control information pattern in this subsequent transmission time interval from this routine time slot processing module, and export this according to the control information pattern of this Transmission Time Interval and control signal to this radio frequency unit.
14. equipment as claimed in claim 13 is characterized in that, this routine time slot processing module comprises:
Sliding correlation detector is with local optional reference sequences and the reference sequences in the current subframe associative operation that slides; And
Peak detector detects maximum slip correlation peak, and the local reference sequences of this peak value correspondence is the reference sequences that current subframe adopts;
Wherein, described reference sequences has good autocorrelation and cross correlation.
15. equipment as claimed in claim 14 is characterized in that, this routine time slot processing module also comprises:
The level mapping block connects this peak detector, and the current subframe reference sequences that detects is mapped as a level respectively;
Buffer memory is in order to the level that reference sequences shone upon of each subframe of buffer memory;
Correlator, connect this buffer memory, when the number of levels of buffer memory reaches buffer storage length, whether having finished Transmission Time Interval according to receiving equipment selects the detection sequence of levels in the buffer memory and one group of predetermined many sequence of levels are made corresponding associative operation synchronously, and determining to detect corresponding one of sequence of levels correlation peak with this, to be scheduled to many sequence of levels be the control information pattern of follow-up L the Transmission Time Interval of this Transmission Time Interval, and L is a positive integer.
16., it is characterized in that this control information pattern comprises no control information and control information is arranged, the type of control information when perhaps comprising no control information and control information being arranged as claim 13 or 15 described equipment.
17. equipment as claimed in claim 15 is characterized in that, and is synchronous if described receiving equipment has been finished Transmission Time Interval, then this correlator is according to formula
Figure FSB00000281007600041
Carry out associative operation, wherein, Y r(n) expression detects sequence of levels, Y kRepresent each predetermined many sequence of levels, k=1 ..., K, K are the quantity of control information pattern, N TTIBe buffer storage length, * represents Y kGet conjugate operation, detect sequence of levels Y with this r(n) maximum related value Z kThe control information pattern of corresponding corresponding a kind of follow-up L the Transmission Time Interval of predetermined many sequence of levels, wherein L is a positive integer.
18. equipment as claimed in claim 15 is characterized in that, and is synchronous if described receiving equipment is not finished Transmission Time Interval, then this correlator is according to formula
Figure FSB00000281007600042
Carry out the slip associative operation, wherein, Y r(n) expression detects sequence of levels, Y kRepresent each predetermined many sequence of levels, k=1 ..., K, K are the quantity of control information pattern, N TTIBe buffer storage length, * represents Y kGet conjugate operation, correlation peak Z (q) kThe control information pattern of corresponding corresponding a kind of follow-up L the Transmission Time Interval of predetermined many sequence of levels, the displacement number q of this peak value correspondence represents that first subframe of Transmission Time Interval appears at current q the subframe place that receives.
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