CN101572895A - Method and device for down shared channel communication - Google Patents
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Abstract
The invention relates to the field of wireless communication and discloses a method and a device for down shared channel communication. In the invention, an invalid unit is defined as below: data signals are sent according to a previously set sequence, reference signals are sent as usual, and a terminal side can judge whether the received unit is the invalid unit or not by comparing the coherent accumulating result of the data signals with the relative relation of noise width. The judging method of the invalid unit can be easily realized, and compared with an incoherent accumulating method, the judging method of the invalid unit has the advantages of enhancive detection and strong anti-noise ability because a coherent accumulating technique is used. The invalid unit is firstly detected, the searching space of a blind detection coding is optimized according to the detecting situation of the invalid unit, and the blind detection coding is then carried out, thus, the probing times of the blind detection coding of a down physical channel can be effectively reduced, and the processing ability of a terminal and the energy of a battery are saved.
Description
Technical field
The present invention relates to wireless communication field, particularly the communication technology of DSCH Downlink Shared Channel.
Background technology
Follow global system for mobile communications (Global System for Mobile communication, abbreviation " GSM "), code division multiple access (Code Division Multiple Access, be called for short " CDMA ") wait in the past twenty years extensively universal of mobile network, global voice communication service has obtained great success.At present, Quan Qiu mobile voice user has surpassed 1,800,000,000.The user to the demand of data services such as Multimedia Message, game on line, video request program, music download and mobile TV also in rapid enhancing.In order to realize these demands, mobile radio system need develop to broadband, portable direction, and communication terminal has been proposed high data bandwidth, low complex degree, low battery power consumption, and the requirement of spectral efficient.
Implementation complexity for wide-band communication system, industry has proposed OFDM (OrthogonalFrequency Division Multiplexing, be called for short " OFDM ")/OFDM access (Orthogonal Frequency Multiple Access is called for short " OFDMA ") technology.
The OFDM technology has been acknowledged as the first-selected transmission technology of super three generations and four-tape WiMAX mobile communication.Basic enterprising line frequency division multiplexing (Frequency DivisionMultiplexing is called for short " FDM ") at OFDM has just constituted the orthogonal frequency division multiplexing multiple access technology, i.e. the OFDMA technology.In common OFDMA technology, whole communication bandwidth is divided into many subcarriers, it is right that each subcarrier can be distributed to certain sender-receiver separately, can be used for point-to-multipoint (Point-to-MultiPoint, be called for short " PMP ") or the communication system of point-to-point (point to point is called for short " P2P ").Common cellular communication system is a point-to-multipoint communication system, single sender (such as the base station) can be simultaneously to one or more receivers (such as mobile phone) transmission information, one or more senders (such as mobile phone) also can be simultaneously to single receiver (such as the base station) transmission information, wherein a plurality of receivers or a plurality of sender take different subcarrier orthogonal on the frequency domain respectively, become the OFDM/OFDMA system.The down link of Long Term Evolution (Long Term Evolution is called for short " the LTE ") system of typical application such as third generation partner program (3rd GenerationPartnership Project is called for short " 3GPP ").
The LTE system has defined 5 kinds of down channels at present: Physical Downlink Shared Channel PDSCH, Physical Broadcast Channel PBCH, Physical Multicast Channel PMCH, Physical Control Format Indicator Channel PC-FICH, Physical Downlink Control Channel (Physical Downlink Control CHannel is called for short " PDCCH ").
Wherein PDCCH carrying scheduling distributes and other control informations.A PDCCH can launch one or more specific control channel unit (Control Channel Element is called for short " CCE "), and the CCE number is 1,2,4 and 8 at present.PDCCH is shared by a plurality of terminals, and promptly a plurality of terminals are monitored a PDCCH simultaneously, and PDCCH is a terminal emission information in these terminals a time.For the terminal of selecting, network identifies mask on the check digit of information with it, has only the terminal that needs to receive can pass through to detect the information that acquisition needs like this.
So, for a terminal, just need carry out blind Detecting decoding, determine whether information is to oneself CCE number emission and information.Concrete grammar is that every kind of possible CCE form is deciphered, if by verification then stop and carrying out work according to the resource of distributing; Can not think that then these data do not issue this UE by decoding and verification if there is a kind of possible CCE form.
Since PDCCH be share and also not scheduling, so for particular terminal, the probability that its blind check measures own information is limited.Therefore, most of times of terminal need be finished blind Detecting decoding (" blind Detecting decoding " is called " blind Detecting " or " blind decoding " sometimes for short) work of all possible CCE, and the searching times of this moment is very big.Blind Detecting decoding is to be finished by the processor in the terminal, because searching times is very big, thus the too much processor resource of occupied terminal, and too much consume the valuable energy content of battery of terminal.
Except the PDCCH in the LTE system, other communication system down link shared channel based on OFDM also may have the too many problem of similar blind Detecting decoding searching times.
Summary of the invention
The object of the present invention is to provide a kind of DSCH Downlink Shared Channel communication means and device, reduced the exploration number of times of the blind Detecting decoding of down physical channel.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of launching technique of DSCH Downlink Shared Channel, may further comprise the steps:
Data to the DSCH Downlink Shared Channel of needs emissions are modulated, and obtain modulated data signal;
If desired in the emission invalid unit of DSCH Downlink Shared Channel, then with predefined sequence as the modulated data signal corresponding with this invalid unit;
With modulated data signal and reference signal synthetic back emission.
Embodiments of the present invention also provide a kind of detection method of invalid unit when receiving DSCH Downlink Shared Channel, may further comprise the steps:
Carry out demodulation to the received signal, each symbol of controlled Channel Elements correspondence;
Each symbol to control channel unit correspondence carries out coherent accumulation with predefined sequence;
Noise is estimated;
If greater than the product of the noise amplitude and the thresholding factor, then judging, the result of coherent accumulation receives the invalid unit that is.
Embodiments of the present invention also provide a kind of DSCH Downlink Shared Channel method of reseptance, may further comprise the steps:
The DSCH Downlink Shared Channel signal of receiving is carried out demodulation;
Whether to have invalid unit in the signal after the method detection demodulation above;
Signal after the demodulation is carried out the blind decoding of control channel unit;
Wherein, if detect invalid unit in the signal after demodulation, then the removal scope covers the search item of this invalid unit in the search volume of blind decoding.
Embodiments of the present invention also provide a kind of base station equipment, comprising:
Modulation module is used for the data of DSCH Downlink Shared Channel are modulated the output modulation data signal;
The reference signal generation module is used to produce reference signal;
Synthesis module is used for reference signal with the modulated data signal of modulation module output and the output of reference signal generation module and synthesizes and transmit;
Transmitter module, be used to launch transmitting of synthesis module generation, also comprise, be connected the selection module between modulation module and the synthesis module, be used for when DSCH Downlink Shared Channel need be launched invalid unit, exporting predefined sequence to synthesis module, when needing the effective control channel of emission unit to the modulated data signal of synthesis module output from modulation module.
Embodiments of the present invention also provide a kind of checkout gear of invalid unit when receiving DSCH Downlink Shared Channel, comprising:
The coherent accumulation module is used for each symbol corresponding to the control channel unit through the demodulation gained is carried out coherent accumulation with predefined sequence, the output accumulated value;
The Noise Estimation module is used for noise is estimated, the noise amplitude that output is estimated;
Judging module is used to judge accumulated value whether greater than the product of the noise amplitude and the thresholding factor, and the output judged result.
Embodiments of the present invention also provide a kind of terminal, comprising:
Receiver module is used for receiving from signal of base station;
Demodulation module, the DSCH Downlink Shared Channel signal that is used for receiver module is received carries out demodulation;
Blind decoding module is used for the signal through the demodulation module demodulation is carried out the blind decoding of control channel unit, also comprises:
Invalid unit checkout gear as mentioned, whether the signal that is used for detecting through the demodulation module demodulation exists invalid unit;
Control unit is used for after the invalid unit detection module detects invalid unit, indicates blind decoding module removal scope from the search volume of blind decoding to cover the search item of this invalid unit.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
By detecting invalid unit earlier, the search volume of blind Detecting being deciphered according to the detection case of invalid unit is optimized, carry out blind Detecting decoding again, can reduce the exploration number of times of the blind Detecting decoding of down physical channel effectively, saved the disposal ability and the energy content of battery of terminal.
Invalid unit be defined as data-signal by predefined sequence launch, as usual emission of reference signal, the result that end side can be by the comparison data signal coherent accumulation and the relativeness of noise amplitude are judged the whether invalid unit of receiving.The determination methods of this invalid unit implements comparatively simple, because used the coherent accumulation technology, so have the gain of detection for the noncoherent accumulation method, noise resisting ability is stronger.
Description of drawings
Fig. 1 is a DSCH Downlink Shared Channel method of reseptance flow chart in the embodiment of the present invention;
Fig. 2 is that invalid unit detects the example schematic diagram that reduces blind Detecting decoding search in the embodiment of the present invention;
Fig. 3 is a terminal structure schematic diagram in the embodiment of the present invention;
Fig. 4 is an architecture of base station schematic diagram in the embodiment of the present invention;
Fig. 5 is invalid unit testing process figure in the embodiment of the present invention;
Fig. 6 is an invalid unit checkout gear structural representation in the embodiment of the present invention;
Fig. 7 is the structural representation of coherent accumulation module in the embodiment of the present invention.
Embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
The flow process of DSCH Downlink Shared Channel method of reseptance as shown in Figure 1 in the embodiment of the present invention.
In step 101, whether terminal judges arrives the zero hour of regulation, if also be less than, then waits for, arrives until the zero hour.A typical representative of alleged here DSCH Downlink Shared Channel is the PDCCH among the LTE, also can be the DSCH Downlink Shared Channel in other system certainly.
After this enter step 102, by the DSCH Downlink Shared Channel signal that begins to light reception regulation hunting zone of the corresponding search of terminal.
After this enter step 103, carry out demodulation to the received signal.
After this enter step 104, in the detection of in the signal of demodulation, carrying out invalid unit (dummy element).The notion that invalid unit in some standard relevant, may occur with the LTE system, but invalid unit just is defined as the unit that is not used, does not clearly propose how not realize invalid unit.At network side is to know which unit is not used, can know that promptly which unit is an invalid unit, but only know when the blind Detecting decoding of end side whether decoding and verification be successful, if not success, and do not know that this unit is that invalid unit or this unit are to issue other terminal.The present invention defines the implementation of invalid unit, and has proposed corresponding emission and detection technique, and concrete content describes in detail in the execution mode of back.
After this enter step 105, judge whether to detect invalid unit,, otherwise enter step 107 if detect then enter step 106.
In step 106, according to detected invalid unit, the search volume that blind Detecting is deciphered is optimized, and after this enters step 107.The method of optimizing is, for each search item in the search volume of initial blind Detecting decoding, if its scope covers invalid unit then deletes this search item, otherwise inoperation.The production method of the search volume of initial blind Detecting decoding is a prior art, has not described in detail here.The example of an optimization as shown in Figure 2.
The CCE relative position is that the message starting point of L is necessary for the position that can be divided exactly by L according to LTE agreement CCE length shown in (a) among Fig. 2.The counterpart terminal search volume is 8 CCE among the figure, and corresponding may CCE length be 1,2,4,8.The search item of the search volume of initial blind Detecting decoding is:
{0}、{1}、{2}、{3}、{4}、{5}、{6}、{7}
{0，1}、{2，3}、{4，5}、{6，7}
{0，1，2，3}、{4，5，6，7}
{0，1，2，3，4，5，6，7}
If light by beginning, detect position 1 and be invalid unit, shown in Fig. 2 (b), then the search item of the search volume of blind Detecting decoding is:
{0}、{2}、{3}、{4}、{5}、{6}、{7}
{2，3}、{4，5}、{6，7}
{4，5，6，7}
If light by beginning, detect position 1,5 and be invalid unit, shown in Fig. 2 (c), then the search item of the search volume of blind Detecting decoding is:
{0}、{2}、{3}、{4}、{6}、{7}
{2，3}、{6，7}
If light by beginning, detect position 1,3,5 and be invalid unit, shown in Fig. 2 (d), then the search item of the search volume of blind Detecting decoding is:
{0}、{2}、{4}、{6}、{7}
{6，7}
By above-mentioned example as can be seen, detect the search volume that can reduce blind Detecting decoding effectively by invalid unit.
In step 107, the signal after the demodulation is carried out the blind Detecting decoding of CCE.If in step 105, detected invalid unit, then in the search volume after step 106 is optimized, carry out blind Detecting decoding.If in step 105, do not detect invalid unit, then in initial search volume, carry out blind Detecting decoding.By detecting invalid unit earlier, the search volume of blind Detecting being deciphered according to the detection case of invalid unit is optimized, carry out blind Detecting decoding again, can reduce the exploration number of times of the blind Detecting decoding of down physical channel effectively, saved the disposal ability and the energy content of battery of terminal.
The following describes the execution mode of terminal, this terminal structure as shown in Figure 3, comprising:
Receiver module is used for receiving from signal of base station;
Demodulation module, the DSCH Downlink Shared Channel signal that is used for receiver module is received carries out demodulation;
The blind Detecting decoding module is used for the signal through the demodulation module demodulation is carried out the blind Detecting decoding of control channel unit;
The invalid unit detection module, whether the signal that is used for detecting through the demodulation module demodulation exists invalid unit;
Control module is finished the sequential scheduling and the testing result selection function of blind decoding module and invalid unit detection module, and output PDCCH demodulation result is to the upper strata.Control unit is after the invalid unit detection module detects invalid unit, and indication blind Detecting decoding module is optimized from the search volume of blind Detecting decoding, and promptly the removal scope covers the search item of this invalid unit from the search volume.The blind Detecting decoding module is under the signal controlling of control module all possible CCE length at that time to be carried out blind Detecting decoding.
Having defined a kind of length in the embodiment of the present invention is the invalid unit of L (the CCE length of L=1 or minimum prescribed): the emission of the particular sequence that provides in advance for data division, launch according to the requirement of present standard for the reference signal part.Reference signal can be the reference signal that defines in the OFDM/OFDMA system, also can be the signal that plays reference role in other system, for example based on the pilot tone in the communication system of CDMA.
Above alleged particular sequence can be following any one:
Length is the random sequence (as m sequence or its part, Golden sequence or its part) of two-value of the data length of agreement regulation or upper-layer configured.
The random sequence (as m sequence or its part, Golden sequence or its part) of the two-value after the specified modulation (being the QPSK modulation in the LTE), its length is the data length of agreement regulation or upper-layer configured.
Length is the many-valued random sequence (as ZC sequence or its part) of the data length of agreement regulation or upper-layer configured.
Sequences such as Golden sequence, m sequence, ZC sequence can obtain by computing, need not store these sequences in advance, thereby reduce the requirement to memory device, computing is undertaken by general processor, and processor just had in base station or terminal originally, only got final product the operation time that need take seldom.
The following describes the execution mode of the launching technique of invalid unit in the DSCH Downlink Shared Channel.This method may further comprise the steps:
Data to the DSCH Downlink Shared Channel of needs emissions are modulated, and obtain modulated data signal;
If desired in the emission invalid unit of DSCH Downlink Shared Channel, then with predefined sequence as the modulated data signal corresponding with this invalid unit;
With modulated data signal and reference signal synthetic back emission.
The following describes the execution mode of base station equipment, the structure of this base station as shown in Figure 4, comprising:
Modulation module is used for the data of DSCH Downlink Shared Channel are modulated the output modulation data signal;
The reference signal generation module is used to produce reference signal.
Synthesis module is used for reference signal with the modulated data signal of modulation module output and the output of reference signal generation module and synthesizes and transmit.
Select module, be connected between modulation module and the synthesis module, be used for when DSCH Downlink Shared Channel need be launched invalid unit, exporting predefined sequence to synthesis module, when needing the effective control channel of emission unit to the modulated data signal of synthesis module output from modulation module.
Transmitter module is used to launch transmitting of synthesis module generation.
The following describes the execution mode of the detection method of invalid unit when receiving DSCH Downlink Shared Channel, the flow process of this method as shown in Figure 5.
In step 501, terminal demodulates CCE corresponding symbol si.
After this enter step 502, terminal is carried out coherent accumulation to the symbol that demodulates:
Wherein M is a CCE length, and pi is predefined sequence.
After this enter step 503, terminal is carried out noise testing, and obtaining corresponding noise amplitude is n.
After this enter step 504, judge whether s＞n * t,, otherwise be judged to be non-invalid unit in step 506 if then be judged to be invalid unit in step 505.Wherein, t is the thresholding factor, and the thresholding factor can be obtained by emulation or actual measurement.Non-invalid unit refers to other unit outside the invalid unit, may difference according to the difference of standard.
Because invalid unit be defined as data-signal by predefined sequence launch, as usual emission of reference signal, so the relativeness of result that end side can be by the comparison data signal coherent accumulation and noise amplitude is judged the whether invalid unit of receiving.The detection method of this invalid unit implements comparatively simple, because used the coherent accumulation technology, so have the gain of detection for the noncoherent accumulation method, noise resisting ability is stronger.
The following describes the execution mode of the checkout gear of invalid unit when receiving DSCH Downlink Shared Channel.The structure of this device as shown in Figure 6, comprising:
Signal through demodulation is input to Noise Estimation module and coherent accumulation module.
The Noise Estimation module is finished the Noise Estimation function, and the noise amplitude that output is estimated is to judging module.
The coherent accumulation module is finished the coherent accumulation function of CCE data division and predefined sequence, and the output accumulated value is to judging module.
Judging module is judged accumulated value whether greater than the judgement of the product of the noise amplitude and the thresholding factor, the output court verdict.The thresholding factor is obtained by emulation or actual measurement.
Coherent accumulation modular structure wherein as shown in Figure 7, wherein,
Sequence generator is finished predefined sequence systematic function (can be in time to produce according to method for generating sequence, also can store immediately in advance and call), and output sequence is to multiplier.
Multiplier is finished the dry run mutually of input data and the local sequence that produces, and exports coherent value to accumulator.
Accumulator is finished the function of energy accumulation and zero clearing under control, the output accumulation result.
Need to prove, each module of mentioning in the unit execution mode of the present invention all is a logic module, physically, a logic module can be a physical module, it also can be the part of a physical module, can also realize that the physics realization mode of these logic modules itself is not most important with the combination of a plurality of physical modules, the combination of the function that these logic modules realized is the key that just solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, the said equipment of the present invention, device embodiments will not too close module not introduced with solving technical problem relation proposed by the invention, and this does not show that there is not other module in the said equipment execution mode.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. the launching technique of a DSCH Downlink Shared Channel is characterized in that, may further comprise the steps:
Data to the DSCH Downlink Shared Channel of needs emissions are modulated, and obtain modulated data signal;
If desired in the emission invalid unit of described DSCH Downlink Shared Channel, then with predefined sequence as the modulated data signal corresponding with this invalid unit;
With described modulated data signal and reference signal synthetic back emission.
2. the launching technique of DSCH Downlink Shared Channel according to claim 1 is characterized in that, described predefined sequence can be the part of one of following sequence or this sequence:
M sequence, Golden sequence, ZC sequence.
3. the detection method of an invalid unit when receiving DSCH Downlink Shared Channel is characterized in that, may further comprise the steps:
Carry out demodulation to the received signal, each symbol of controlled Channel Elements correspondence;
Each symbol to control channel unit correspondence carries out coherent accumulation with predefined sequence;
Noise is estimated;
If greater than the product of the noise amplitude and the thresholding factor, then judging, the result of described coherent accumulation receives the invalid unit that is.
4. the detection method of invalid unit is characterized in that during reception DSCH Downlink Shared Channel according to claim 3, and the described thresholding factor is obtained by emulation or actual measurement.
5. the detection method of invalid unit is characterized in that described DSCH Downlink Shared Channel can be a Physical Downlink Control Channel during reception DSCH Downlink Shared Channel according to claim 4.
6. a DSCH Downlink Shared Channel method of reseptance is characterized in that, may further comprise the steps:
The DSCH Downlink Shared Channel signal of receiving is carried out demodulation;
Whether to have invalid unit in the signal after the described method detection of claim 3 demodulation;
Signal after the described demodulation is carried out the blind decoding of control channel unit;
Wherein, if detect invalid unit in the signal after described demodulation, then the removal scope covers the search item of this invalid unit in the search volume of described blind decoding.
7. DSCH Downlink Shared Channel method of reseptance according to claim 6 is characterized in that, described invalid unit length is 1 or the control channel element length of minimum prescribed;
Further comprising the steps of: by the DSCH Downlink Shared Channel signal that begins to light reception regulation hunting zone of the corresponding search of terminal.
8. base station equipment comprises:
Modulation module is used for the data of DSCH Downlink Shared Channel are modulated the output modulation data signal;
The reference signal generation module is used to produce reference signal;
Synthesis module is used for reference signal with the modulated data signal of described modulation module output and the output of described reference signal generation module and synthesizes and transmit;
Transmitter module, be used to launch transmitting of described synthesis module generation, it is characterized in that, also comprise, be connected the selection module between described modulation module and the described synthesis module, be used for when described DSCH Downlink Shared Channel need be launched invalid unit, exporting predefined sequence to described synthesis module, when needing the effective control channel of emission unit to the modulated data signal of described synthesis module output from described modulation module.
9. the checkout gear of an invalid unit when receiving DSCH Downlink Shared Channel is characterized in that, comprising:
The coherent accumulation module is used for each symbol corresponding to the control channel unit through the demodulation gained is carried out coherent accumulation with predefined sequence, the output accumulated value;
The Noise Estimation module is used for noise is estimated, the noise amplitude that output is estimated;
Judging module is used to judge described accumulated value whether greater than the product of the noise amplitude and the thresholding factor, and the output judged result.
10. terminal comprises:
Receiver module is used for receiving from signal of base station;
Demodulation module, the DSCH Downlink Shared Channel signal that is used for described receiver module is received carries out demodulation;
Blind decoding module is used for the signal through described demodulation module demodulation is carried out the blind decoding of control channel unit, it is characterized in that, also comprises:
Invalid unit checkout gear as claimed in claim 9, whether the signal that is used for detecting through described demodulation module demodulation exists invalid unit;
Control unit is used for after described invalid unit detection module detects invalid unit, indicates described blind decoding module removal scope from the search volume of blind decoding to cover the search item of this invalid unit.
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| CN101790190A (en) * | 2010-01-08 | 2010-07-28 | 中兴通讯股份有限公司 | Method and device for detecting downlink control information |
| WO2010149106A1 (en) * | 2010-01-08 | 2010-12-29 | 中兴通讯股份有限公司 | Method and device for detecting downlink control infomation |
| US8861500B2 (en) | 2010-01-08 | 2014-10-14 | Zte Corporation | Method and device for detecting downlink control information |
| CN101790190B (en) * | 2010-01-08 | 2014-12-10 | 中兴通讯股份有限公司 | Method and device for detecting downlink control information |
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