CN104125035A - Method and apparatus for DCI false detection screening - Google Patents
Method and apparatus for DCI false detection screening Download PDFInfo
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Abstract
The invention provides a method and apparatus for DCI false detection screening. The method comprises: determining downlink control information (DCI) meeting a first screening condition including at least one of a first condition and a second condition; and determining DCI in a right format based on the DCI meeting the first screening condition. Determination of the DCI meeting the first screening condition is realized by carrying out screening on DCI obtained by blind detection according to a corresponding relation between a route metric value of convolutional code decoding and the DCI obtained by blind detection or the characteristic of the convolutional code decoding process, thereby guaranteeing accuracy of the hard bit of the DCI fundamentally and reducing the false detection rate. Meanwhile, DCI in a right format also can be determined by combining a second screening condition and field parsing examination, thereby furthermore guaranteeing accuracy of uplink and downlink data receiving of the mobile terminal and stability of a long term evolution (LTE) system.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of long evolving system (LTE, Long Term Evolution) in the method and apparatus of DCI error detection examination in the blind detection process of Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channal).
Background technology
In the descending receiving course of LTE mobile terminal, comprise PDCCH is received.That PDCCH carries is the Downlink Control Information (DCI of one or more mobile terminal, Downlink Control Information), comprise that mobile terminal receives Physical Downlink Shared Channel (PDSCH, PhysicalDownlink Shared Channel) demodulation, the descending scheduling assignment information that decoding etc. need, and mobile terminal row shared channel (PUSCH physically, Physical Uplink Shared Channel) when transmission the scheduling authorization such as resource and the transformat information that should use, confirmation and the uplink physical channel power control information of shared channel transmission.Visible, whether mobile terminal can accurately obtain DCI information accurately and will be directly connected to the reception of mobile terminal up-downgoing data, and then affects the performance of LTE terminal.DCI has 10 kinds of forms, wherein form 0 correspondence is the schedule information of PUSCH, what form 1,1A, 1B, 1C, 1D were corresponding is the schedule information of PDSCH, and what form 2,2A were corresponding is some configuration informations of many antennas situation, and what form 3,3A were corresponding is the configuration information of uplink power control.
Mobile terminal is in the time receiving, and what do not know current PDCCH transmission is any information, do not know where own required information is yet, but mobile terminal knows under current state that what information what expect to receive is, such as, if mobile terminal is idle pulley, what expect reception is paging system message; If mobile terminal is random access mode, what expect reception is accidental access response message; If mobile terminal is waited for upstream data transmission, what expect reception is uplink scheduling assignment information etc.Then mobile terminal just can be with corresponding Radio Network Temporary Identifier (RNTI, Radio Network Temporary Identifier) and DCI form do cyclic redundancy check (CRC) (CRC, Cyclic Redundancy Check), if verification is by just confirming that this information is that mobile terminal is needed, just can determine the Format Type of DCI according to message length, then mobile terminal just can further solve the concrete information content from DCI again.Above process is exactly so-called PDCCH blind detection process.
Concrete, blind detection process has comprised the checking procedure of convolution code decoding and 16 CRC.For each subframe, be to the maximum 44 times according to the number of times of the known blind Detecting of agreement, need to carry out at most 16 CRC check 44 times in each subframe.Understandable, the probability that 16 CRC produce collision is 1/65536, that is to say that the situation of an error detection likely appears in every 65536 16 CRC check, to the DCI of original mistake by CRC check.Suppose that a frame has 6 descending sub frames, so every 248.24 frames just there will be DCI flase drop one time, and this is a sizable probability, if this flase drop is not carried out to necessary processing, can cause the descending reception of mobile terminal and uplink feedback all to occur mistake, LTE terminal capabilities is caused to tremendous influence.
In prior art, common DCI error detection screening method mainly contains two kinds, and a kind of method is adjudicated DCI by erroneous judgement rule corresponding to DCI Format Type; Another kind method is the number of times by reducing blind Detecting, reduces the number of times of flase drop.For first method, owing to existing each field of a lot of DCI all to meet call format, but be actually the situation of flase drop, error detection judging nicety rate is not high; For second method, although reduced the number of times of blind Detecting, cannot reduce in essence the probability of flase drop.
The U.S. Patent application that correlation technique can be US2013010724A1 with reference to publication number.
Summary of the invention
What the present invention solved is the high problem of error detection probability of DCI in blind detection process.
For addressing the above problem, the invention provides the method for a kind of DCI error detection examination, comprising:
Determine the DCI that meets the first examination condition, described the first examination condition comprises at least one in first condition and second condition;
Determine the DCI of correct format based on the described DCI that meets the first examination condition; Wherein,
Described first condition is that polymerization grade is that to be less than or equal to Mp_Ali or polymerization grade be that the path metric value of i and corresponding convolution code decoding is greater than Mp_Ali but is less than Mq and M_Average for the path metric value of i and corresponding convolution code decoding; Described Mp_Ali is the path metric value of the convolution code decoding that each subframe polymerization grade p DCI that be i after examination DCI is by described path metric value sequence is corresponding, described Mq is the path metric value of the convolution code decoding that q the DCI of each subframe after examination DCI is by described path metric value sequence is corresponding, described M_Average is the mean value that each subframe is treated the path metric value of the convolution code decoding that examination DCI is corresponding, and described p and q are determined by the quantity of the corresponding PDCCH channel of each subframe;
Described second condition is the path metric value minimum of the convolution code decoding of correspondence in the DCI that Format Type is identical and RNTI value is equal.
What optionally, described each subframe treated that examination DCI and described polymerization grade are i treats that examination DCI is all by the ascending sequence of described path metric value.
Optionally, the span of p is [1,5], and the span of q is [1,11].
Optionally, in the time that the quantity of the corresponding PDCCH channel of each subframe is 1, p=1, q=1.
What optionally, described each subframe treated that examination DCI and described polymerization grade are i treats that examination DCI is all by the descending sequence of described path metric value.
Optionally, describedly determine that based on the described DCI of the first examination condition of meeting the DCI of correct format comprises: the DCI that the DCI that meets the first examination condition is defined as to correct format.
Optionally, describedly determine that based on the described DCI of the first examination condition of meeting the DCI of correct format comprises: will meet the first examination condition and be defined as the DCI of correct format by the DCI that field is resolved inspection.
Optionally, the method for described DCI error detection examination also comprises: will meet the first examination condition but the DCI that do not resolve inspection by field is defined as the DCI of error format.
Optionally, describedly meet the DCI of the first examination condition and determine that the DCI of correct format comprises based on described:
To meet the first examination condition and the second examination condition and be defined as the DCI of correct format by the DCI that field is resolved inspection; Wherein,
Described the second examination condition comprises at least one in Article 3 part and Article 4 part, wherein Article 3 part be Format Type be non-zero and antenna mask be not 1 or Format Type be 0, when described Article 4 part is convolution code decoding, the initial condition of searching route is identical with done state.
Optionally, the method for described DCI error detection examination also comprises: the DCI that the DCI that does not meet the second examination condition is defined as to error format.
Optionally, the method for described DCI error detection examination also comprises:
Determine the DCI that meets the second examination condition; Described the second examination condition comprises at least one in Article 3 part and Article 4 part, wherein, described Article 3 part be Format Type be non-zero and antenna mask be not 1 or Format Type be 0, when described Article 4 part is convolution code decoding, the initial condition of searching route is identical with done state;
The described DCI that determines satisfied the first examination condition refers to definite DCI that meets described the first examination condition the DCI from meeting the second examination condition.
Optionally, the method for described DCI error detection examination also comprises: the DCI that the DCI that does not meet the second examination condition is defined as to error format.
For addressing the above problem, technical solution of the present invention also provides the device of a kind of DCI error detection examination, comprising:
The first examination unit, for determining the DCI that meets the first examination condition, described the first examination condition comprises at least one in first condition and second condition;
Determining unit, for determining the DCI of correct format based on the described DCI that meets the first examination condition; Wherein,
Described first condition is that polymerization grade is that to be less than or equal to Mp_Ali or polymerization grade be that the path metric value of i and corresponding convolution code decoding is greater than Mp_Ali but is less than Mq and M_Average for the path metric value of i and corresponding convolution code decoding; Described Mp_Ali is the path metric value of the convolution code decoding that each subframe polymerization grade p DCI that be i after examination DCI is by described path metric value sequence is corresponding, described Mq is the path metric value of the convolution code decoding that q the DCI of each subframe after examination DCI is by described path metric value sequence is corresponding, described M_Average is the mean value that each subframe is treated the path metric value of the convolution code decoding that examination DCI is corresponding, and described p and q are determined by the quantity of the corresponding PDCCH channel of each subframe;
Described second condition is the path metric value minimum of the convolution code decoding of correspondence in the DCI that Format Type is identical and RNTI value is equal.
Optionally, described determining unit is for being defined as the DCI that meets the first examination condition the DCI of correct format.
Optionally, described determining unit is for meeting the first examination condition and be defined as the DCI of correct format by the DCI that field is resolved inspection.
Optionally, described determining unit is for meeting the first examination condition and the second examination condition and be defined as the DCI of correct format by the DCI that field is resolved inspection; Wherein, described the second examination condition comprises at least one in Article 3 part and Article 4 part, wherein Article 3 part be Format Type be non-zero and antenna mask be not 1 or Format Type be 0, when described Article 4 part is convolution code decoding, the initial condition of searching route is identical with done state.
Optionally, the device of described DCI error detection examination also comprises: the second examination unit, for determining the DCI that meets the second examination condition; Described the second examination unit comprises at least one in Article 3 part and Article 4 part, wherein, described Article 3 part be Format Type be non-zero and antenna mask be not 1 or Format Type be 0, when described Article 4 part is convolution code decoding, the initial condition of searching route is identical with done state;
The DCI that meets described the first examination condition is determined in described the first examination unit for the DCI from meeting the second examination condition.
Compared with prior art, the method of the DCI error detection examination that technical solution of the present invention provides, determine the DCI of correct format based on the first examination condition, particularly, the corresponding relation when DCI obtaining based on blind Detecting and convolution code decoding between path metric value, and the characteristic of convolution code decode procedure, the DCI error detection that may cause decode procedure mistake has been carried out examination, fundamentally reduce the probability of DCI error detection, ensured the correctness of the hard bit information obtaining after convolution code decoding.
In addition, can also resolve inspection in conjunction with the second examination condition and field, DCI is carried out to form examination, further ensure the accuracy of mobile terminal up-downgoing data receiver and the stability of LTE system.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the method for the DCI error detection examination that provides of technical solution of the present invention;
Fig. 2 is the schematic flow sheet of the method for the DCI error detection examination that provides of the embodiment of the present invention one;
Fig. 3 is the schematic flow sheet of the method for the DCI error detection examination that provides of the embodiment of the present invention two;
Fig. 4 is the schematic flow sheet of the method for the DCI error detection examination that provides of the embodiment of the present invention three.
Embodiment
As stated in the Background Art, existing DCI error detection screening method mainly contains two kinds, a kind of is by erroneous judgement rule corresponding to DCI Format Type, DCI to be adjudicated, after PDCCH blind Detecting finishes, preserve by DCI and the format type information corresponding to DCI of convolution code decoding and CRC check, then according to described erroneous judgement rule, Format Type corresponding to DCI judged, and then complete the examination of DCI error detection.For example, judge according to precoding information corresponding to DCI Format Type whether the DCI that blind Detecting obtains is the DCI of correct format.Concrete, in the time of the discontented football association of the represented information of the code bit that prelists corresponding in DCI view regulation, just can determine that this DCI is error format; In the time that the represented information of the code bit that prelists corresponding in DCI meets agreement regulation, just think that this DCI is correct format.Can find out, the method of this DCI error detection examination, the DCI directly blind Detecting being obtained carries out form judgement, shortcoming is not have the issuable error detection of examination DCI decode procedure, cause the DCI of a lot of decoding errors to pass through erroneous judgement rule corresponding to DCI Format Type, error detection examination rate is not high.
The method of another kind of DCI error detection examination, is the number of times by reducing blind Detecting, reduces the number of times of error detection.Such as by the polymerization grade detecting is limited within the specific limits, or the number of candidate PDCCH corresponding each polymerization grade is limited within the specific limits etc. to mode, effectively reduce the number of times of blind Detecting, thereby further reduce the number of times of error detection.But it will be understood by those skilled in the art that the method can not effectively reduce the probability of DCI error detection in essence.
In the time that the DCI of LTE system false detection rate is high, can cause descending reception mistake and uplink feedback mistake, and affect the receiving velocity of LTE terminal system, the performance of LTE mobile terminal is caused to serious impact.
For solving the high problem of DCI false detection rate, inventor has proposed the method for a kind of DCI error detection examination, as shown in Figure 1, comprising:
Step S1: determine the DCI that meets the first examination condition.Described the first examination condition at least comprises at least one in first condition and second condition.
Described first condition is that polymerization grade is that to be less than or equal to Mp_Ali or polymerization grade be that the path metric value of i and corresponding convolution code decoding is greater than Mp_Ali but is less than Mq and M_Average for the path metric value of i and corresponding convolution code decoding; Described Mp_Ali is the path metric value of the convolution code decoding that each subframe polymerization grade p DCI that be i after examination DCI is by described path metric value sequence is corresponding, described Mq is the path metric value of the convolution code decoding that q the DCI of each subframe after examination DCI is by described path metric value sequence is corresponding, described M_Average is the mean value that each subframe is treated the path metric value of the convolution code decoding that examination DCI is corresponding, and described p and q are determined by the quantity of the corresponding PDCCH channel of each subframe;
Described second condition is the path metric value minimum of the convolution code decoding of correspondence in the DCI that Format Type is identical and RNTI value is equal.
Step S2: the DCI that determines correct format based on the described DCI that meets the first examination condition.Concrete, can directly the DCI that meets the first examination condition be determined to the DCI of correct format, also can be defined as the DCI of correct format by meeting the first examination condition and resolving by field the DCI checking, satisfied the first examination condition and the second examination condition and the DCI checking by field can also be defined as to the DCI of correct format.Wherein, described the second examination condition comprises at least one in Article 3 part and Article 4 part, described Article 3 part be Format Type be non-zero and antenna mask be not 1 or Format Type be 0, when described Article 4 part is convolution code decoding, the initial condition of searching route is identical with done state.
Visible, the method of the DCI error detection examination that technical solution of the present invention provides, the corresponding relation when DCI obtaining based on blind Detecting and convolution code decoding between path metric value, and the characteristic of convolution code decode procedure, the DCI error detection that may cause decode procedure mistake has been carried out examination, fundamentally reduce the probability of DCI error detection, ensured the correctness of the hard bit information obtaining after convolution code decoding.In addition, can also resolve inspection in conjunction with the second examination condition and field, DCI is carried out to form examination, further ensure the accuracy of mobile terminal up-downgoing data receiver and the stability of LTE system.
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
Embodiment mono-
The present embodiment is to resolve and check in conjunction with the first examination condition, the second examination condition and field, filters out the DCI of correct format.As shown in Figure 2, it is the schematic flow sheet of the method for the DCI error detection examination that provides of the embodiment of the present invention one, first from meet the second examination condition DCI, determine the DCI that meets the first examination condition, and then resolve and check the final DCI that determines correct format in conjunction with field.Wherein, the first examination condition comprises first condition and second condition, and the second examination condition comprises Article 3 part and Article 4 part.
Step S21: the path metric value M that treats the convolution code decoding that examination DCI is corresponding is sorted.Wherein, the DCI obtaining after the blind Detecting that is each subframe until examination DCI.Because the number of times of each subframe blind Detecting is no more than 44, therefore treat that the number of examination DCI is also no more than 44, in the present embodiment, acquiescence reaches maximum search number of times.Concrete, can treat that to described examination DCI sorts, and can obtain following sequence according to M order from small to large:
M1，M1，M2……M44。
Wherein M1 represents the minimal path metric of the DCI that treats examination, and M44 represents the maximum path metric of the DCI that treats examination.
Step S22: the M that examination DCI is corresponding that treats that is i to polymerization grade sorts.From agreement, the quantity of the control channel unit (CCE, Control Channel Element) that PDCCH can be shared according to it is classified, and is called polymerization grade i, has four kinds of values, is respectively 1,2,4,8.In the time of blind Detecting, carry out successively according to polymerization grade.Search for such as first equaling 1 for i, determine that i equals 1 o'clock corresponding search volume, then carry out RNTI descrambling and CRC check, if verification succeeds receives, saved as the DCI that treats examination.Then successively to i equal 2, i equal 4 and i equal 8 and search for.Concrete blind detection process can be with reference to pertinent literature.After path metric value corresponding DCI being sorted according to polymerization grade corresponding to DCI, to sort from small to large as example, can obtain following sequence matrix:
M1_Al1,M2_Al1,…M12_Al1,
M1_Al2,M2_Al2,…M12_Al2,
M1_Al4,M2_Al4,…M12_Al4,
M1_Al8,M2_Al8,…M7_Al8。
P the path metric value that DCI is corresponding that after Mp_Ali represents to sort, polymerization grade is i, for example, M1_Al1 represents that polymerization grade is path metric value (the 1st path metric value corresponding to DCI) minimum in 1 DCI, and M12_Al1 represents that polymerization grade is maximum path metric value (the 12nd path metric value corresponding to DCI) in 1 DCI.
The sequence of step S21 and step S22, its effect has been mainly for the ease of carrying out follow-up examination determining step.In the specific implementation, can not sort, directly carry out the selection of comparing in follow-up examination step.
Step S23: the Format Type that judges whether described DCI is non-zero and antenna mask is 1.This step is actually and judges whether described DCI meets Article 3 part, if the judged result of step S23, for being, does not meet Article 3 part, if the judged result of step S23 for otherwise meet Article 3 part, Format Type be non-zero and antenna mask be not 1 or Format Type be 0 DCI belongs to the DCI that meets Article 3 part.LTE is in the time of descending transmission, and the DCI that is 0 to form also can do XOR one time with antenna mask in the time of CRC scrambling, and the fixing value of this antenna mask is 1, and the DCI of extended formatting type is not done to this XOR.Therefore after CRC check, for the DCI of form 0, the bit of its antenna mask should be fixed as 1, not should be 1 for the bit of its antenna mask of DCI of non-zero form.If that is to say, the judged result of step S23 is yes, and the antenna mask reading after the DCI decoding of non-zero form is 1 o'clock, with regard to illustrating that the DCI that this decoding obtains is the DCI of error format, should screen out; If the judged result of step S23 is no, Format Type be non-zero and antenna mask be not 1 or Format Type be 0 and antenna mask be 1, can carry out next step judgement, perform step S24.
Step S24: while judging described DCI convolution code decoding, whether the initial condition of searching route and done state equate.This step is to judge whether described DCI meets Article 4 part, if the judged result of step S24, for being, meets Article 4 part.In the time of convolution coding, last 6 bits that can extract information to be encoded are used for 6 shift registers of initialization codes device, while so just having determined coding, encoder has identical initial condition and done state, and while also just having determined convolution code decoding, the initial condition of searching route and done state are for equating simultaneously.That is to say, this characteristic of convolution coding process has just determined to work as initial condition and the unequal situation of done state of the searching route that has occurred DCI, illustrate that mistake appears in decoding, also, with regard to having determined that the DCI that this decoding obtains is the DCI of error format, should be screened out.If the determination result is YES, can carry out next step examination, execution step S25.
In the present embodiment, first the DCI that the judgement of step S23 and step S24 namely obtains for blind Detecting has carried out whether meeting the judgement of the second examination condition, effect is that the DCI that blind Detecting is obtained first carries out a scalping, for the examination step of follow-up relative complex (in the present embodiment, be and judge that whether DCI meets the first examination condition) reduce the quantity of examination object, and then reduce the complexity that follow-up examination step realizes, and can economize on resources for mobile terminal, improve screening efficiency.In other embodiments, to the less demanding application scenarios of resource efficiency, also can judge DCI carries out after whether meeting the first examination condition by judging that whether satisfied the second examination condition of DCI is put into.Meanwhile, in other embodiments, also can be according to examination demand, select any one in this Article 3 part and Article 4 part as the second examination condition.
Step S25: judge whether described DCI is the path metric value minimum of convolution code decoding in the DCI that Format Type is identical and RNTI value is equal.This step namely judges that whether described DCI meets second condition, if the judged result of step S25 is for being, meets second condition.In the time of descending reception, DCI Format Type and RNTI value, for there being relation one to one, have and only have a DCI that Format Type is identical and RNTI value is identical.Meanwhile, the general principle of convolution code encoding and decoding algorithm, is exactly by the burst receiving and likely transmitted signal sequence comparison, selects the sequence that wherein sequence of path metric value minimum is current transmission.That is to say, if exist the identical and RNTI value of multiple Format Types also when identical DCI, according to the characteristic of convolution code encoding and decoding algorithm, should select the DCI of wherein corresponding path metric value minimum, then carry out next step examination, perform step S26.In like manner, the path metric value that DCI is corresponding is not minimum, when judged result is no, can determine that this DCI is the DCI of error format, should screen out.
Step S26: judge whether the M that DCI is corresponding is less than or equal to Mp_Ali, if perform step S28, perform step if not S27.Wherein, Mp_Ali is the path metric value of the convolution code decoding that each subframe polymerization grade p DCI that be i after examination DCI is by described path metric value sequence is corresponding.Such as, set p and equal 3, choose exactly the DCI that in sequence matrix definite in step S22, first three columns DCI is correct format.The span of p determines based on PDCCH channel quantity in each subframe.For example, in the time only having a PDCCH channel in subframe, p=1 just can be set, i.e. a DCI that DCI is correct format to each polymerization grade path selection metric minimum.In actual applications, the value of p can determine according to the result of reality test, should consider in conventional use presumable PDCCH channel quantity in each subframe, also will consider the computational efficiency of mobile terminal, and general span can be [1,5].
Step S27: judge whether the M that DCI is corresponding is less than Mq and M_Average, if perform step S28, determine if not the DCI that this DCI is error format.Wherein M_Average is average path metric, and each subframe is treated the mean value of the corresponding path metric value of examination DCI, and Mq is the path metric value of the convolution code decoding that q the DCI of each subframe after examination DCI is by described path metric value sequence is corresponding.Such as, q is set as to 5, the DCI that the DCI that selects its corresponding path metric value in front 5 DCI in sequence definite in step S21 to be less than M_Average is correct format.Wherein q is the same with p, is that the PDCCH channel quantity comprising based on each subframe determines.For example, in the time only having a PDCCH channel in subframe, q=1 just can be set, the DCI that DCI of path selection metric minimum is correct format.In actual applications, the value of q can determine according to the result of reality test, and general span can be [1,11].
Step S26 and step S27 are and judge whether described DCI meets first condition.S25 is combined with step, and whether the described DCI that is the present embodiment meets the determining step of the first examination condition.In other embodiments, also can only select first condition or second condition as the first examination condition, in ensureing certain Effect of screening, can simplify examination step, save system resource.Also it should be noted that, in other embodiments, according to the difference of convolution code decoding specific implementation process, treat that the DCI of examination and the examination DCI that treats that polymerization grade is i can also sort according to its corresponding path metric value order from big to small, and those skilled in the art can know the value of p and q according to the above description by inference, do not repeat them here.
S28: judge whether DCI resolves inspection by field.Through the examination of preceding step, the error detection that decoding error may have been caused is got rid of substantially, now just can determine according to the length of DCI the Format Type of DCI, then carries out corresponding field and resolves inspection.Concrete, field resolve the condition checking at least comprise following any: Format Type be 0 or the DCI form Warning Mark position information of 1A correct; Format Type be 1 1A or 2 or the DCI of 2A and scrambling mode be that the DCI mixed automatic retransfer request HARQ process number of SPS C_RNTI is correct; Polishing zero-adding bit is 0; Resource block assignments information is correct; Transmission mode and RNTI type are correct.Field is resolved the condition checking and is not limited to that the present embodiment mentions, and can also comprise in other embodiments that other field is resolved inspection condition.After judgement, do not resolve by field the DCI checking, can confirm as the DCI of error format, should screen out; Resolve by field the DCI checking and can confirm as the DCI of correct format.So far, the information that mobile terminal just can be based on parsing in this DCI, carries out the reception of downlink data and the feedback of upstream data.
The method of the DCI error detection examination that the present embodiment provides, the corresponding relation when DCI obtaining based on blind Detecting and convolution code decoding between path metric value, the DCI error detection that may cause convolution code decoding in blind detection process has been done examination, has fundamentally reduced the probability of DCI error detection.
Further, the method for the DCI error detection examination that the present embodiment provides, combines the characteristic of convolution code decoding decode procedure, and hard the DCI after decoding bit has been carried out to examination, has reduced DCI false detection rate.
Further, the method for the DCI error detection examination that the present embodiment provides, also combines field parsing and checks that the DCI to meeting the first examination condition and the second examination condition has done form judgement, the DCI that the DCI that has ensured final acquisition is correct format.
The method of the DCI error detection examination that the present embodiment provides, under identical blind Detecting number of times, can reduce by 66% left and right by the probability of error detection, has significantly improved the performance of mobile terminal and LTE network.Meanwhile, in actual applications, stricter examination thresholding can also be set, make DCI false detection rate reduce at least 95%.
In other embodiments, also can not resolve and check in conjunction with field, directly the DCI that meets the first examination condition and the second examination condition is defined as to the DCI of correct format, also can reduce to a great extent the false detection rate of DCI.
Embodiment bis-
The present embodiment is to meet the first examination condition and to be defined as the DCI of correct format by the DCI that field is resolved inspection.Wherein, the first examination condition comprises first condition and second condition.
As shown in Figure 3, the schematic flow sheet of the method for the DCI error detection examination providing for the embodiment of the present invention two, comprising:
Step S31: will treat that the convolution code decoding path metric value M that examination DCI is corresponding sorts.The step S21 of the concrete enforcement of this step in can reference example one.
Step S32: the M that examination DCI is corresponding that treats that is i to polymerization grade sorts.The step S22 of the concrete enforcement of this step in can reference example one.
Step S33: judge whether the M that DCI is corresponding is less than or equal to Mp_Ali.The step S26 of the concrete enforcement of this step in can reference example one.
Step S34: judge whether the M that DCI is corresponding is less than Mq and M_Average.The step S27 of the concrete enforcement of this step in can reference example one.
Step S35: judge whether DCI resolves inspection by field.The step S28 of the concrete enforcement of this step in can reference example one.
The method of the DCI error detection examination that the present embodiment provides, path metric value based on convolution code decoding carries out examination as examination foundation to DCI error detection, the DCI error detection that may cause convolution code decoding in blind detection process has been done examination, has fundamentally reduced the probability of DCI error detection.
Further, resolve and check in conjunction with field, the format information of the DCI after decoding is checked accordingly, make may further reducing of DCI error detection, ensured the correct reception of mobile terminal up-downgoing data.In other embodiments, the first examination condition can only comprise first condition or second condition.
Embodiment tri-
The present embodiment is the DCI that the DCI that meets the first examination condition is defined as to correct format.Wherein, the first examination condition comprises first condition.
As shown in Figure 4, the schematic flow sheet of the method for the DCI error detection examination providing for the embodiment of the present invention three, comprising:
Step S41: convolution code decoding path metric value M corresponding examination DCI is sorted.The step S21 of the concrete enforcement of this step in can reference example one.
Step S42: the M that examination DCI is corresponding that treats that is i to polymerization grade sorts.The step S22 of the concrete enforcement of this step in can reference example one.
Step S43: judge whether the M that DCI is corresponding is less than or equal to Mp_Ali.The step S26 of the concrete enforcement of this step in can reference example one.
Step S44: judge whether the M that DCI is corresponding is less than Mq and M_Average.The step S27 of the concrete enforcement of this step in can reference example one.
The method of the DCI error detection examination that the present embodiment the present embodiment provides, path metric value based on convolution code decoding carries out examination as examination foundation to DCI error detection, the DCI error detection that may cause convolution code decoding in blind detection process has been done examination, can fundamentally reduce the probability of DCI error detection.In other embodiments, the first examination condition can only comprise first condition and second condition, can also only comprise second condition.
Embodiment tetra-
The present embodiment provides the device of a kind of DCI error detection examination, comprising: the first examination unit, and for determining the DCI that meets the first examination condition, described the first examination condition at least comprises first condition and second condition; Wherein, described first condition is that polymerization grade is that to be less than or equal to Mp_Ali or polymerization grade be that the path metric value of i and corresponding convolution code decoding is greater than Mp_Ali but is less than Mq and M_Average for the path metric value of i and corresponding convolution code decoding; Described Mp_Ali is the path metric value of the convolution code decoding that each subframe polymerization grade p DCI that be i after examination DCI is by described path metric value sequence is corresponding, described Mq is the path metric value of the convolution code decoding that q the DCI of each subframe after examination DCI is by described path metric value sequence is corresponding, described M_Average is the mean value that each subframe is treated the path metric value of the convolution code decoding that examination DCI is corresponding, and described p and q are determined by the quantity of the corresponding PDCCH channel of each subframe; Described second condition is the path metric value minimum of the convolution code decoding of correspondence in the DCI that Format Type is identical and RNTI value is equal.
Determining unit, for determining the DCI of correct format based on the described DCI that meets the first examination condition.
The concrete enforcement of the device of the DCI error detection examination that the present embodiment provides can, with reference to the method for DCI error detection examination described in the embodiment of the present invention one, two or three, not repeat them here.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (17)
1. a method for DCI error detection examination, is characterized in that, comprising:
Determine the DCI that meets the first examination condition, described the first examination condition comprises at least one in first condition and second condition;
Determine the DCI of correct format based on the described DCI that meets the first examination condition; Wherein,
Described first condition is that polymerization grade is that to be less than or equal to Mp_Ali or polymerization grade be that the path metric value of i and corresponding convolution code decoding is greater than Mp_Ali but is less than Mq and M_Average for the path metric value of i and corresponding convolution code decoding; Described Mp_Ali is the path metric value of the convolution code decoding that each subframe polymerization grade p DCI that be i after examination DCI is by described path metric value sequence is corresponding, described Mq is the path metric value of the convolution code decoding that q the DCI of each subframe after examination DCI is by described path metric value sequence is corresponding, described M_Average is the mean value that each subframe is treated the path metric value of the convolution code decoding that examination DCI is corresponding, and described p and q are determined by the quantity of the corresponding PDCCH channel of each subframe;
Described second condition is the path metric value minimum of the convolution code decoding of correspondence in the DCI that Format Type is identical and RNTI value is equal.
2. the method for DCI error detection as claimed in claim 1 examination, is characterized in that, what described each subframe treated that examination DCI and described polymerization grade are i treats that examination DCI is all by the ascending sequence of described path metric value.
3. the method for DCI error detection as claimed in claim 2 examination, is characterized in that, the span of p is [1,5], and the span of q is [1,11].
4. the method for DCI error detection as claimed in claim 3 examination, is characterized in that, in the time that the quantity of the corresponding PDCCH channel of each subframe is 1, and p=1, q=1.
5. the method for DCI error detection as claimed in claim 1 examination, is characterized in that, what described each subframe treated that examination DCI and described polymerization grade are i treats that examination DCI is all by the descending sequence of described path metric value.
6. the method for DCI error detection as claimed in claim 1 examination, is characterized in that, the described DCI based on described satisfied the first examination condition determines that the DCI of correct format comprises: the DCI that the DCI that meets the first examination condition is defined as to correct format.
7. the method for DCI error detection as claimed in claim 1 examination, it is characterized in that, describedly determine that based on the described DCI of the first examination condition of meeting the DCI of correct format comprises: will meet the first examination condition and be defined as the DCI of correct format by the DCI that field is resolved inspection.
8. the method for DCI error detection as claimed in claim 7 examination, is characterized in that, also comprises: will meet the first examination condition but the DCI that do not resolve inspection by field is defined as the DCI of error format.
9. the method for DCI error detection as claimed in claim 1 examination, is characterized in that, the described DCI based on described satisfied the first examination condition determines that the DCI of correct format comprises:
To meet the first examination condition and the second examination condition and be defined as the DCI of correct format by the DCI that field is resolved inspection; Wherein,
Described the second examination condition comprises at least one in Article 3 part and Article 4 part, wherein Article 3 part be Format Type be non-zero and antenna mask be not 1 or Format Type be 0, when described Article 4 part is convolution code decoding, the initial condition of searching route is identical with done state.
10. the method for DCI error detection as claimed in claim 9 examination, is characterized in that, also comprises: the DCI that the DCI that does not meet the second examination condition is defined as to error format.
The method of 11. DCI error detection examinations as described in claim 6 or 7, is characterized in that, also comprises: determine the DCI that meets the second examination condition; Described the second examination condition comprises at least one in Article 3 part and Article 4 part, wherein, described Article 3 part be Format Type be non-zero and antenna mask be not 1 or Format Type be 0, when described Article 4 part is convolution code decoding, the initial condition of searching route is identical with done state;
The described DCI that determines satisfied the first examination condition refers to definite DCI that meets described the first examination condition the DCI from meeting the second examination condition.
The method of 12. DCI error detection as claimed in claim 11 examinations, is characterized in that, also comprises: the DCI that the DCI that does not meet the second examination condition is defined as to error format.
The device of 13. 1 kinds of DCI error detections examination, is characterized in that, comprising:
The first examination unit, for determining the DCI that meets the first examination condition, described the first examination condition comprises at least one in first condition and second condition;
Determining unit, for determining the DCI of correct format based on the described DCI that meets the first examination condition; Wherein,
Described first condition is that polymerization grade is that to be less than or equal to Mp_Ali or polymerization grade be that the path metric value of i and corresponding convolution code decoding is greater than Mp_Ali but is less than Mq and M_Average for the path metric value of i and corresponding convolution code decoding; Described Mp_Ali is the path metric value of the convolution code decoding that each subframe polymerization grade p DCI that be i after examination DCI is by described path metric value sequence is corresponding, described Mq is the path metric value of the convolution code decoding that q the DCI of each subframe after examination DCI is by described path metric value sequence is corresponding, described M_Average is the mean value that each subframe is treated the path metric value of the convolution code decoding that examination DCI is corresponding, and described p and q are determined by the quantity of the corresponding PDCCH channel of each subframe;
Described second condition is the path metric value minimum of the convolution code decoding of correspondence in the DCI that Format Type is identical and RNTI value is equal.
The device of 14. DCI error detection as claimed in claim 13 examinations, is characterized in that, described determining unit is for being defined as the DCI that meets the first examination condition the DCI of correct format.
The device of 15. DCI error detection as claimed in claim 13 examinations, is characterized in that, described determining unit is for meeting the first examination condition and be defined as the DCI of correct format by the DCI that field is resolved inspection.
The device of 16. DCI error detection as claimed in claim 13 examinations, is characterized in that, described determining unit is for meeting the first examination condition and the second examination condition and be defined as the DCI of correct format by the DCI that field is resolved inspection; Wherein, described the second examination condition comprises at least one in Article 3 part and Article 4 part, wherein Article 3 part be Format Type be non-zero and antenna mask be not 1 or Format Type be 0, when described Article 4 part is convolution code decoding, the initial condition of searching route is identical with done state.
The device of 17. DCI error detection examinations as described in claims 14 or 15, is characterized in that, also comprises: the second examination unit, for determining the DCI that meets the second examination condition; Described the second examination unit comprises at least one in Article 3 part and Article 4 part, wherein, described Article 3 part be Format Type be non-zero and antenna mask be not 1 or Format Type be 0, when described Article 4 part is convolution code decoding, the initial condition of searching route is identical with done state;
The DCI that meets described the first examination condition is determined in described the first examination unit for the DCI from meeting the second examination condition.
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