CN102347919B - Blind detection method - Google Patents
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- CN102347919B CN102347919B CN201010246101.9A CN201010246101A CN102347919B CN 102347919 B CN102347919 B CN 102347919B CN 201010246101 A CN201010246101 A CN 201010246101A CN 102347919 B CN102347919 B CN 102347919B
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Abstract
The invention provides a blind detection method, which comprises the following steps: receiving a carrier which carries a physical downlink control channel (PDCCH), and acquiring a carrier indicator field (CIF) corresponding to the carrier from the carrier, wherein the CIF comprises three bits in all; determining the number N of downlink control information (DCI) needed to be detected according to the values of a second bit and a third bit of the acquired CIF; and carrying out blind detection, and ending the process of blind detection after N DCI is detected. With the adoption of the method provided by the invention, the error detection probability and the battery loss can be lowered.
Description
Technical field
The present invention relates to senior Long Term Evolution (LTE-A, Long Term Evolution-Advanced) technology, particularly the blind checking method in a kind of LTE-A technology.
Background technology
LTE-A technology is the follow-up evolution technology of LTE technology.In traditional approach, target peak speed, as the speed of 1Gbits/S can obtain by 100MHz or more continuous bandwidth, but in most of the cases, the competition of frequency spectrum etc. makes to obtain so large continuous bandwidth and becomes unrealistic, for this reason, in LTE technology, propose carrier aggregation technology, by two even more main carriers of polymerization, met larger bandwidth demand.Fig. 1 is existing carrier aggregation mode schematic diagram.
In LTE-A technology, down direction, each user terminal (UE) maximum can be supported 5 member carriers (CC, Component Carrier) (up direction is also 5, and up direction and scheme of the present invention are irrelevant).Wherein, 4 carrier waves (Cross-CC) that member carrier is cross scheduling, its corresponding Downlink Control Information is carried on other member carrier, correspondingly, 1 remaining member carrier is for carrying the Downlink Control Information (DCI of the carrier wave of 4 cross schedulings, Downlink ControlInformation), certainly, also need to carry the DCI of self.Specifically, it is upper that each DCI is carried on Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel), and PDCCH is further carried on member carrier.Common in addition, corresponding 3 DCI of each member carrier, in one of them DCI, be provided with carrier wave indication territory (CIF), comprise altogether 3 bits, according to the difference of the value of each bit (0 or 1), CIF can show as 8 kinds of different values, in actual applications, can pass through 5 kinds of values wherein, indicate above-mentioned 5 different member carriers as 000,001,010,011,100.
In prior art, UE can obtain required DCI by carry out blind Detecting in search volume, described search volume comprises public search space (Common Search Space) and the specific search volume of UE (UE-Specific Search Space), wherein, public search space is for all UE, and the specific search volume of UE is for particular UE.Table one is parameter corresponding to existing public search space and the specific search volume of UE.
Table one
As shown in Table 1, public search space only has 2 kinds of polymerization grades (Aggregation level), 4 and the specific search volume of 8, UE have 4 kinds of polymerization grades, 1,2,4,8.In addition, on PDCCH, the elementary cell of carrying DCI is control channel unit (CCE, Control Channel Element), in each CCE, comprise 9 resource unit group (REG, Resource Element Group), in each REG, comprise 4 RE, that is to say, each CCE is a continuous resource piece that comprises 36 RE.The size of public search space is 16 CCE, and the size of the specific search volume of UE is relevant with polymerization grade, and minimum is 6 CCE, is 16 CCE to the maximum.UE is when carrying out blind Detecting, conventionally do not know use which polymerization grade, therefore all possibilities all can be attempted one time, for example, for public search space, UE need respectively according to polymerization grade be 4 and polymerization grade be 8 to search for, when polymerization grade is 4,16 CCE need to search for 4 times, namely there are 4 PDCCH candidates, when polymerization grade is 8,16 CCE need to search for 2 times, namely have 2 PDCCH candidates.UE can go out required DCI according to PDCCH candidate matches.
LTE-A technology is as the evolution technology of LTE technology, than LTE technology, realize more complicated, such as having introduced upstream multi-antenna transmission, multiplexing to four-level space in up maximum support, for the UE being scheduled, in each uplink member carrier, can transmit 2 transmission block (TB, Transport Block), each TB piece has the modulating-coding grade (MCS of oneself, Multi-Code Scheme), for 2 transmitting antennas and 4 transmitting antennas, use respectively 3bits and 6bits precoding technique, therefore need to increase new DCI form, that is to say, it will be more needing the DCI quantity detecting.
In existing protocol, stipulate, when UE detects required DCI at every turn, can carry out at most A * 60 time (being maximum blind Detecting number of times) blind Detecting, A represents the member carrier number being scheduled, as 5.Due in distributing to the search volume of UE, UE does not also know to need the DCI number of blind Detecting, therefore need to carry out blind Detecting by maximum blind Detecting number of times, blind Detecting number of times is very huge, can increase so undoubtedly the battery loss of UE, and, blind Detecting number of times is more, the possibility of makeing mistakes is also larger, and probability of false detection is larger, because of its performance loss.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of blind checking method, can reduce probability of false detection and battery loss.
For achieving the above object, technical scheme of the present invention is achieved in that
A blind checking method, comprising:
Receive the carrier wave of carrying physical downlink control channel PDCCH, and therefrom obtain the carrier wave indication territory CIF that this carrier wave is corresponding, in described CIF, comprise altogether 3 bits;
According to second of the CIF getting and the value of the 3rd bit determine the quantity N that needs the Downlink Control Information DCI that detects;
Start to carry out blind Detecting, and after detecting N DCI, finish blind detection process.
Describedly obtain the CIF that this carrier wave is corresponding and comprise:
The CIF that is appointment value by the value of the first bit is defined as carrying CIF corresponding to carrier wave of PDCCH.
Described appointment value is 1 or 0;
When described appointment value is 1, the CIF that is 0 by the value of the first bit is defined as the CIF corresponding to carrier wave of cross scheduling;
When described appointment value is 0, the CIF that is 1 by the value of the first bit is defined as the CIF corresponding to carrier wave of cross scheduling;
For CIF corresponding to the carrier wave of cross scheduling, the value of second and the 3rd bit is wherein used to indicate the sequence number of the carrier wave of corresponding cross scheduling.
The value of second and the 3rd bit of the CIF that described basis gets determines that the quantity N of the DCI that needs detection comprises:
According to second of the CIF getting and the value of the 3rd bit determine the quantity M of the carrier wave of cross scheduling; Calculate (M+1) * 3, using result of calculation as N.
Visible, adopt technical scheme of the present invention, according in CIF corresponding to carrier wave of carrying PDCCH the 2nd and the value of the 3rd bit determine the quantity N of the DCI that needs detection, and finishing blind detection process after detecting N DCI, thereby reduced blind Detecting number of times, and then reduced probability of false detection and battery loss.
Accompanying drawing explanation
Fig. 1 is existing carrier aggregation mode schematic diagram.
Fig. 2 is the flow chart of blind checking method embodiment of the present invention.
Embodiment
For problems of the prior art, a kind of brand-new blind checking method is proposed in the present invention, can reduce probability of false detection and battery loss.
For make technical scheme of the present invention clearer, understand, referring to the accompanying drawing embodiment that develops simultaneously, scheme of the present invention is described in further detail.
Fig. 2 is the flow chart of blind checking method embodiment of the present invention.As shown in Figure 2, comprise the following steps:
Step 21: receive the carrier wave of carrying PDCCH, and therefrom obtain the CIF that this carrier wave is corresponding.
Step 22: according to the 2nd of the CIF getting the and the value of the 3rd bit determine the quantity N that needs the DCI that detects.
Introducing before foundation is known, conventionally, corresponding 3 DCI of each member carrier, in one of them DCI, be provided with CIF, comprise altogether 3 bits, according to the difference of the value of each bit (0 or 1), CIF can show as 8 kinds of different values, in actual applications, can represent by 5 kinds of values wherein 5 different member carriers (carries the carrier wave of PDCCH and the carrier wave of 4 cross schedulings).
In scheme of the present invention, the implication of the value of each bit in CIF and expression is modified.Such as, if the value of the first bit in a CIF is 1, represent that this CIF is for CIF corresponding to carrier wave of carrying PDCCH, if 0, represent that this CIF is the CIF corresponding to carrier wave of cross scheduling.
For CIF corresponding to carrier wave of carrying PDCCH, the value of the 2nd and the 3rd bit is wherein used to indicate the quantity M of the carrier wave of cross scheduling; For CIF corresponding to the carrier wave of cross scheduling, the value of the 2nd and the 3rd bit is wherein used to indicate the sequence number of the carrier wave of corresponding cross scheduling.
Table two is the implication of the different value representatives of each bit in CIF.
Table two
It should be noted that, in actual applications, the implication of the different value representatives of above-mentioned each bit can arrange arbitrarily as required, is not limited to shown in table two.Such as also working as when the first bit value in CIF is 0, represent that this CIF is for CIF corresponding to carrier wave of carrying PDCCH, the value of the first bit is to represent that this CIF is the CIF corresponding to carrier wave of cross scheduling at 1 o'clock, and the 2nd and the 3rd bit is also like this.
In actual applications, UE can receive prior to the carrier wave of cross scheduling the carrier wave of carrying PDCCH, after receiving this carrier wave, first according to the value of the first bit, find the CIF that this carrier wave is corresponding, as the value of the first bit CIF that is 1, then, according in CIF the 2nd and the value of the 3rd bit determine the quantity N that needs the DCI that detects, such as, the 2nd and the value of the 3rd bit be 00 (quantity of supposing to represent the carrier wave of cross scheduling is 1), N=(1+1) * 3=6, co-exist in two member carriers (carrier wave of the carrier wave of a cross scheduling and a carrying PDCCH), the quantity of the DCI that each carrier wave is corresponding is 3, therefore need altogether to detect 6 DCI, for another example, the 2nd and the value of the 3rd bit be 11 (quantity of supposing to represent the carrier wave of cross scheduling is 4), N=(4+1) * 3=15.
Step 23: start to carry out blind Detecting, and after detecting N DCI, finish blind detection process.
In this step, if the value of N is 6, after detecting 6 DCI, blind detection process can be finished so, if the value of N is 15, after detecting 15 DCI, blind detection process can be finished so.How carrying out blind Detecting is prior art, repeats no more.
So far, completed the introduction about the method for the invention embodiment.
In a word, adopt technical scheme of the present invention, according in CIF corresponding to carrier wave of carrying PDCCH the 2nd and the value of the 3rd bit determine the quantity N of the DCI that needs detection, and finishing blind detection process after detecting N DCI, thereby reduced blind Detecting number of times, and then reduced probability of false detection and battery loss.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (3)
1. a blind checking method, is characterized in that, the method comprises:
Receive the carrier wave of carrying physical downlink control channel PDCCH, and therefrom obtain the carrier wave indication territory CIF that this carrier wave is corresponding, in described CIF, comprise altogether 3 bits;
According to second of the CIF getting and the value of the 3rd bit determine the quantity N that needs the Downlink Control Information DCI that detects;
Start to carry out blind Detecting, and after detecting N DCI, finish blind detection process;
Wherein, described in, obtaining the CIF that this carrier wave is corresponding comprises:
The CIF that is appointment value by the value of the first bit is defined as carrying CIF corresponding to carrier wave of PDCCH.
2. method according to claim 1, is characterized in that, described appointment value is 1 or 0;
When described appointment value is 1, the CIF that is 0 by the value of the first bit is defined as the CIF corresponding to carrier wave of cross scheduling;
When described appointment value is 0, the CIF that is 1 by the value of the first bit is defined as the CIF corresponding to carrier wave of cross scheduling;
For CIF corresponding to the carrier wave of cross scheduling, the value of second and the 3rd bit is wherein used to indicate the sequence number of the carrier wave of corresponding cross scheduling.
3. method according to claim 1 and 2, is characterized in that, the value of second and the 3rd bit of the CIF that described basis gets determines that the quantity N of the DCI that needs detection comprises:
According to second of the CIF getting and the value of the 3rd bit determine the quantity M of the carrier wave of cross scheduling; Calculate (M+1) * 3, using result of calculation as N.
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| WO2023097178A1 (en) * | 2021-11-24 | 2023-06-01 | Qualcomm Incorporated | Type 3 hybrid automatic repeat request codebook feedback triggering |
| EP3579482B1 (en) * | 2017-03-23 | 2023-06-28 | Huawei Technologies Co., Ltd. | Methods and corresponding devices for improved dci detection |
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| CN109309957B (en) * | 2017-07-26 | 2021-10-01 | 大唐移动通信设备有限公司 | Method, terminal and base station for determining whether to continue detecting downlink control channel |
| CN110831181B (en) * | 2018-08-10 | 2022-09-09 | 华为技术有限公司 | Information detection method, communication device, and computer-readable storage medium |
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| WO2023097178A1 (en) * | 2021-11-24 | 2023-06-01 | Qualcomm Incorporated | Type 3 hybrid automatic repeat request codebook feedback triggering |
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