CN102244885B - Blind detection method and device for control channel - Google Patents
Blind detection method and device for control channel Download PDFInfo
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- CN102244885B CN102244885B CN201010173837.8A CN201010173837A CN102244885B CN 102244885 B CN102244885 B CN 102244885B CN 201010173837 A CN201010173837 A CN 201010173837A CN 102244885 B CN102244885 B CN 102244885B
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Abstract
The invention discloses a blind detection method and device for a control channel. In the method, according to the detected channel quality of a control region, a user terminal determines an Aggregation level corresponding to the channel quality; according to the determined Aggregation level, the user terminal determines the blind detection sequence of the Aggregation level during the blind detection on the control channel; and the user terminal performs blind detection on the control channel according to the determined blind detection sequence of the Aggregation level. By utilizing the method and device disclosed by the invention, the efficiency of blind detection on the control channel can be improved, the frequency of blind detection is reduced, and the consumption of power of the user terminal can be reduced.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of control channel blind checking method and device thereof.
Background technology
In 3GPP LTE Release 8 system, the length of a descending sub frame (subframe) is that 1ms is (when adopting normal cyclic prefix, comprise 14 OFDM symbol, wherein OFDM is the English abbreviation of Orthogonal Frequency Division Multiplexing, i.e. orthogonal frequency division multiplexi), comprise control area (PDCCH, i.e. Physical Downlink Control Channel) and data area (PDSCH, i.e. Physical Downlink Shared Channel), its structure is as shown in Figure 1.
(N can be 1 to the top n of each subframe, 2,3 or 4) symbol can as control area, comprise RE (the Resource Element of PCFICH (Physical Control Format Indicator Channel), PDCCH, PHICH (physical mixed ARQ indicating channel), RS (reference signal) and some skies, Resource Unit, a RE occupies a subcarrier on frequency domain, time domain occupies an OFDM symbol) etc.
Wherein, PDCCH refers to that user is special, and the resource of each PDCCH can be dispersed on the symbol of the whole control area of whole bandwidth sum, can take 1,2,4 or 8 CCE (ControlChannel Element, i.e. control channel unit, each CCE comprises 36 RE).Such as, the CU 1 that channel condition is good or 2 CCE, the CU 4 that channel condition is weaker or 8 CCE.
Current terminal detects one's own PDCCH by detecting the PDCCH meropia of control area, and detailed process is:
1, obtaining the OFDM symbol number of control domain by separating PCFICH, the OFDM symbol number of control domain being multiplied by the number of sub carrier wave of downlink bandwidth and deducting the RE number of reference signal, obtaining the RE total number N_RE_Ctrl of control area;
2, PCFICH and PHICH RE number N _ RE_1 shared in control domain is added up;
3, the RE number leaving PDCCH in control domain for is determined: N_RE_PDCCH=N_RE_Ctrl-N_RE_1;
4, the CCE number N _ CCE_PDCCH=N_RE_PDCCH/36 of PDCCH is calculated;
5, the Aggregation level (polymerization grade) of PDCCH has several possible value of 1,2,4,8CCE.3GPP TS 36.213V9.1.0Table9.1.1-1 (as shown in Figure 2) is looked into respectively to all Aggregation level and determines search volume, obtain so-called PDCCH candidates (can be described as PDCCH position candidate);
6, to each PDCCH candidate, find corresponding CCE group in control area, demodulation decoding, if find CRC after decoding, the match is successful, then this terminal successfully detects one's own PDCCH; Otherwise find next PDCCH candidate demodulation and decoding until this terminal successfully detects one's own PDCCH.
Inventor is realizing in process of the present invention, finds that prior art at least exists following defect:
Existing terminal carries out blind Detecting method to PDCCH region determines search volume owing to will table look-up respectively to all Aggregation level, obtain so-called PDCCH candidates, then demodulation is carried out to each PDCCH candidate and decoding is until find the CRC of certain PDCCH candidate that the match is successful, terminal processes is complicated, the blind Detecting time is longer, also larger to the consumption of end cell.
Summary of the invention
Embodiments provide a kind of control channel blind checking method and device thereof, in order to solve length of existing control channel blind Detecting time, detection problem often.
The control channel blind checking method that the embodiment of the present invention provides, comprising:
User terminal, according to the channel quality of the control area detected, determines the polymerization grade corresponding with described channel quality;
Described user terminal according to the polymerization grade determined, the blind check order of polymerization grade when determining to carry out blind Detecting to control channel;
Described user terminal, according to the blind check order of the polymerization grade determined, carries out blind Detecting to control channel.
The user terminal that the embodiment of the present invention provides, comprising:
First determining unit, for the channel quality according to the control area detected, determines the polymerization grade corresponding with described channel quality;
Second determining unit, for the polymerization grade determined according to described first determining unit, the blind check order of polymerization grade when determining to carry out blind Detecting to control channel;
Blind Detecting unit, for the blind check order of the polymerization grade determined according to described second determining unit, carries out blind Detecting to control channel.
In the above embodiment of the present invention, by the channel quality of user terminal according to the control area detected, determine corresponding polymerization grade, and the blind check order of polymerization grade when determining to carry out blind Detecting to control channel with this, thus the blind check order of rational polymerization grade can be determined according to the quality requirements of control channel, and then first carry out control channel blind Detecting from most possible search volume, carry out compared with control channel blind Detecting with prior art from whole search volume, improve blind detection efficiency, decrease blind Detecting number of times and time.
Accompanying drawing explanation
Fig. 1 is the descending sub frame schematic diagram of LTE R8 system in prior art;
Fig. 2 is 3GPP TS 36.213Table 9.1.1-1 schematic diagram in prior art;
Fig. 3 a is the mapping relations schematic diagram that in the embodiment of the present invention, subscriber terminal side is preserved;
Fig. 3 b is the mapping relations schematic diagram that in the embodiment of the present invention, base station side is preserved;
The terminal that Fig. 4 provides for the embodiment of the present invention carries out the schematic flow sheet of blind Detecting to control channel;
The structural representation of the user terminal that Fig. 5 provides for the embodiment of the present invention.
Embodiment
For the problems referred to above that prior art exists, for reducing the blind Detecting complexity of control channel and reducing blind Detecting time and number of times, the embodiment of the present invention proposes the order determining Aggregation level according to the control channel quality requirements of user, and determine that the technical scheme of control channel blind Detecting is carried out in search volume according to this order, thus the efficiency of control channel blind Detecting can be improved, reduce blind Detecting time or number of times, save terminal power consumption, and reduce blind Detecting complexity.
Below for 3GPP LTE Release 8 system, in conjunction with the accompanying drawing in embodiments of the invention, the technical scheme in embodiments of the invention is clearly and completely described, obviously, the embodiments described below are only the present invention's part embodiments, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of embodiments of the invention protection.
In the embodiment of the present invention, can be previously stored with in user terminal the channel quality of control area and control channel (as PDCCH) the mapping relations table of CCE quantity (or Aggregation level, as follows) that uses.Fig. 3 a shows the mapping relations of the CCE quantity that a kind of channel quality parameter of control area and PDCCH channel use.As shown in the figure, channel quality parameter can be SINR (Signal toInterference plus Noise Ratio, signal interference ratio), also can be that other can reflect the parameter of channel quality, can also be map according to channel quality parameter (as SINR) CQI (Channel QualityIndication, CQI) obtained; CCE quantity can be 1,2,4,8.Wherein, channel quality is higher, then corresponding CCE quantity corresponding to channel quality parameter is less.Certain above-mentioned mapping relations also can be stored by other data structure mode.
See Fig. 4, the user terminal provided for the embodiment of the present invention carries out the schematic flow sheet of blind Detecting to control channel, in this flow process, the channel quality parameter that user terminal detects is SINR.This flow process mainly comprises the following steps:
Step 401, user terminal, according to the channel quality of the control area of this terminal, determine corresponding CCE quantity and position.
In this step, user terminal after the channel SINR of control area being detected, by inquiring about the mapping relations table as shown in Figure 3 a that this terminal stores, can find corresponding CCE quantity.Current search volume can be divided into 3 types, the first kind is the search volume comprising all Aggregation level, Equations of The Second Kind is the search volume only comprising certain Aggregation level, as only comprised the search volume of the Aggregation level of 2 CCE, the 3rd class is the search volume at the PDCCH place of UE.The relation of three is that first kind search volume scope is maximum, Equations of The Second Kind search volume is within the scope of first kind search volume, and the relevant position of Equations of The Second Kind search volume in first kind search volume of different Aggregation level, the 3rd class search volume is within the scope of Equations of The Second Kind search volume.After user terminal determines CCE quantity, due to CCE quantity and Aggregation level one_to_one corresponding, therefore also just define Aggregation level, thus directly can determine position, corresponding Equations of The Second Kind search volume.
Step 402, user terminal, according to the CCE quantity determined, determine the order (or claiming the blind check order of Aggregation level) of Aggregation level when carrying out space search.
In this step, all Aggregation level oneself sort to being least applicable to oneself according to from the most applicable by user terminal.Concrete, Aggregation level corresponding to determined CCE quantity can be come front position, thereafter corresponding Aggregation level is arranged according to the order that the channel quality matching degree detected reduces, preferably, the Aggregation level the poorest with the CCE quantity Matching degree determined can be transitioned into gradually.Such as, if the CCE quantity determined is 2, then the Aggregationlevel after sequence is 2,1,4,8, or 2,4,1,8; If the CCE quantity determined is 8, then the Aggregation level after sequence is 8,4,2,1; If the CCE quantity determined is 4, then the Aggregation level after sequence is 4,2,1,8, or 4,2,8,1, or 4,8,2,1; Wherein 1,2,4,8 represent CCE quantity respectively; If the CCE quantity determined is 1, then the Aggregation level after sequence is 1,2,4,8.
Step 403, user terminal, according to the Aggregation level after sequence, are determined corresponding search volume, obtain its PDCCH candidates, and demodulation coding are until this terminal successfully detects one's own PDCCH.
In this step, for each Aggregation level after sequence, user terminal determines the search volume of each Aggregation level by lookup table mode, as by inquiry 3GPPTS 36.213 Table 9.1.1-1 as shown in Figure 2, determine corresponding search volume and PDCCH candidates.Then, according to the order of the Aggregation level after sequence, to each PDCCH candidate, corresponding CCE group is found in control area, demodulation decoding, if find CRC after decoding, the match is successful, then this terminal successfully detects one's own PDCCH; Otherwise find next PDCCH candidate demodulation and decoding until this terminal successfully detects one's own PDCCH.
First user terminal also can determine search volume according to the Aggregation level ranked the first, and carries out blind Detecting in this search volume; If fail to detect the control channel of this user terminal, then determine search volume according to next Aggregation level, and in this search volume, carry out blind check, by that analogy, until the control channel of this user terminal detected or until reach maximum blind check number of times.
In above-mentioned flow process, user terminal determining the channel quality of control area of CCE quantity time institute foundation, can be the channel quality of present sub-frame or the PDCCH region of subframe in the past.
Under normal circumstances, top n (as N=3) OFDM symbol in the descending sub frame of 3GPP LTE Release 8 system is used for transmitting control channel, and the CCE of control channel is distributed on the full bandwidth of OFDM symbol, therefore, in the present embodiment, user terminal can measure the broadband channel quality of the top n OFDM symbol of descending sub frame.User terminal also can measure indicated by PCFICH N, and (N can be 1,2,3 or 4) individual OFDM symbol but do not comprise the broadband channel quality of the RE shared by PHICH and PCFICH, wherein, PCFICH is 2 bit values, for representing that PDCCH takies several OFDM symbol before a subframe.
User terminal can carry out the channel quality detection of control area according to setting cycle or time, also can carry out the channel quality detection of control area before needing to carry out PDCCH search, thus can obtain the channel quality of the PDCCH region of present sub-frame.
In another embodiment of the invention, user terminal is except can the flow process according to Fig. 4 carry out except PDCCH search, the channel quality information of the control area that measurement can also be obtained (can be channel quality parameter, as SINR, also can be map according to channel quality parameter the PDCCH CQI obtained) report base station.Base station side stores the mapping relations table of channel quality and CCE quantity too, and this mapping relations table can be identical or corresponding with the mapping relations table that end side stores.Base station according to the channel quality information of the control area of user terminal to send up, with reference to corresponding CCE quantity, can send PDCCH to this user terminal.Like this, the CCE quantity that can use compared with the guarantee base station transmission PDCCH of limits is consistent according to channel quality determined CCE quantity with terminal, thus further increase the PDCCH blind detection efficiency of end side, reduce blind Detecting number of times and time, and and then the electrical source consumption of saving user terminal.
With an instantiation, the above embodiment of the present invention is described in detail below.In this example, subscriber terminal side stores mapping relations table as shown in Figure 3 a, and accordingly, base station side also stores mapping relations table, and this table can be as shown in Figure 3 b.
In this example, user terminal, by detecting the channel of control area, obtains channel SINR numerical value, and this SINR numerical value belongs to SINR interval 2 as shown in Figure 3 a, user terminal maps and obtains the PDCCH CQI corresponding with this SINR, and this CQI is reported base station;
Base station receives the CQI of this user terminal to send up, and when sending PDCCH to this user terminal, by inquiry mapping relations table as shown in Figure 3 b, obtaining corresponding CCE quantity is 2, thus uses 2 CCE for this user terminal transmission PDCCH;
This user terminal is by inquiry mapping relations table as shown in Figure 3 a, the CCE quantity corresponding with the SINR detected is found to be 2, therefore sort to Aggregationlevel during PDCCH blind check according to aforesaid mode, the order after sequence is: 2,1,4,8; Then, by inquiry table as shown in Figure 2, search volume and the PDCCH candidates of Aggregation level is obtained.User terminal first Aggregation level be 2 search volume and corresponding PDCCH candidates in blind Detecting PDCCH, if blind check the PDCCH of this user terminal can be measured, then terminate blind Detecting; Otherwise, be the search volume of 1 and blind Detecting PDCCH in corresponding PDCCH candidates at Aggregation level, by that analogy, until blind check is measured the PDCCH of this user terminal or until reached the maximum blind Detecting number of times of regulation.Due in this example, base station side is according to the channel quality of user terminal to send up, corresponding 2 CCE are adopted to send PDCCH, and end side is also according to channel quality, first to Aggregation level be 2 search volume and corresponding PDCCH candidates carry out blind Detecting, thus can go out the PDCCH of this user terminal by direct-detection.
By describing above and can finding out, in the embodiment of the present invention, user terminal is according to the channel condition of control area, the order of Aggregation level when determining to carry out blind Detecting to control channel, thus the Aggregation level mated with channel quality conditions is stood out, first determine search volume with regard to this Aggregation level and carry out the blind Detecting of control channel.Because base station side is when the control channel for terminal distributes Aggregation level, usually also can the channel quality condition of reference terminal, therefore, user terminal is by the way, control channel can be detected comparatively accurately, thus reduce blind Detecting number of times and time.
In prior art, user terminal normally carries out blind check in first kind space, and in the embodiment of the present invention, corresponding Aggregation level can be determined by the channel quality in detection control region, thus first in the search volume that this Aggregation level is corresponding, carry out blind Detecting, compared with prior art, reduce the scope of search volume, blind Detecting can be carried out more targetedly.
Based on identical technical conceive, the embodiment of the present invention additionally provides a kind of user terminal.
As shown in Figure 5, this user terminal can comprise: the first determining unit 501, second determining unit 502, blind Detecting unit 503, wherein:
First determining unit 501, for the channel quality according to the control area detected, determines the Aggregation level corresponding with described channel quality;
Second determining unit 502, for the Aggregationlevel determined according to the first determining unit 501, the blind check order of Aggregation level when determining to carry out blind Detecting to control channel;
Blind Detecting unit 503, for the blind check order of the Aggregation level that determines according to the second determining unit 502, carries out blind Detecting to control channel.
In above-mentioned user terminal, the first determining unit 501, by the inquiry channel quality of control area and the mapping relations table of Aggregation level, determines the Aggregation level corresponding with the channel quality of the control area detected.
In above-mentioned user terminal, the Aggregation level corresponding with the channel quality detected can rank the first by the second determining unit 502, arranges corresponding Aggregation level thereafter according to the order that the channel quality matching degree detected reduces.
In above-mentioned user terminal, first blind Detecting unit 503 can determine search volume according to the Aggregationlevel ranked the first, and carries out blind Detecting in this search volume; If fail to detect the control channel of this user terminal, then determine search volume according to next Aggregation level, and in this search volume, carry out blind check, by that analogy, until the control channel of this user terminal detected or until reach maximum blind check number of times.
Above-mentioned user terminal, also can comprise: channel quality detection unit 504, for measuring the broadband channel quality of the top n orthogonal frequency division multiplex OFDM symbol of descending sub frame; Or, measure the top n OFDM symbol of descending sub frame but do not comprise the broadband channel quality of the Resource Unit RE that physical mixed ARQ indicating channel PHICH and Physical Control Format Indicator Channel PCFICH takies; Wherein, N is indicated by Physical Control Format Indicator Channel PCFICH, and N is 1,2,3 or 4.
Above-mentioned user terminal, also can comprise: report unit 505, for before carrying out blind Detecting, by the information reporting of the channel quality of control area that detects to network side.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required general hardware platform by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform method described in each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (14)
1. a control channel blind checking method, is characterized in that, comprising:
User terminal, according to the channel quality of the control area detected, determines the polymerization grade corresponding with described channel quality;
Described user terminal according to the polymerization grade determined, the blind check order of polymerization grade when determining to carry out blind Detecting to control channel;
Described user terminal, according to the blind check order of the polymerization grade determined, carries out blind Detecting to control channel;
Wherein, the blind check order of described polymerization grade when determining to carry out blind Detecting to control channel, is specially:
The polymerization grade corresponding with the channel quality detected is ranked the first, arranges corresponding polymerization grade according to the order that the channel quality matching degree detected reduces thereafter.
2. the method for claim 1, is characterized in that, described user terminal, according to the channel quality of the control area detected, is determined the polymerization grade corresponding with described channel quality, being comprised:
Described user terminal, by the inquiry channel quality of control area and the mapping relations table of polymerization grade, determines the polymerization grade corresponding with the channel quality of the control area detected.
3. the method for claim 1, is characterized in that, when the polymerization grade determined is 1 control information unit CCE, the blind check order of the polymerization grade determined is 1,2,4,8 CCE;
When the polymerization grade determined is 2 CCE, the blind check order of the polymerization grade determined is 2,1,4,8 CCE, or is 2,4,1,8 CCE, or is 2,4,8,1 CCE;
When the polymerization grade determined is 4 CCE, the blind check order of the polymerization grade determined is 4,8,2,1 CCE, or is 4,2,8,1 CCE;
When the polymerization grade determined is 8 CCE, the blind check order of the polymerization grade determined is 8,4,2,1 CCE.
4. the method for claim 1, is characterized in that, described user terminal, according to the blind check order of the polymerization grade determined, carries out blind Detecting to control channel, is specially:
First described user terminal determines search volume according to the polymerization grade ranked the first, and carries out blind Detecting in this search volume; If fail to detect the control channel of this user terminal, then determine search volume according to next polymerization grade, and carry out blind check in this search volume, by that analogy, until the control channel of this user terminal detected or until reach maximum blind check number of times.
5. the method for claim 1, is characterized in that, the process of the channel quality in described user terminal detection control region, comprising:
Measure the broadband channel quality of the top n orthogonal frequency division multiplex OFDM symbol of descending sub frame;
Or, measure the top n OFDM symbol of descending sub frame but do not comprise the broadband channel quality of the Resource Unit RE that physical mixed ARQ indicating channel PHICH and Physical Control Format Indicator Channel PCFICH takies;
Wherein, N is indicated by Physical Control Format Indicator Channel PCFICH, and N is 1,2,3 or 4.
6. the method for claim 1, is characterized in that, the channel quality of control area, comprising: the channel quality of the control area of present sub-frame or in the past subframe.
7. the method for claim 1, is characterized in that, also comprises:
Described user terminal before carrying out blind Detecting, by the information reporting of the channel quality of control area that detects to network side;
Network side, according to the channel quality of the control area of described user terminal to send up, is determined corresponding polymerization grade, and is sent described control channel according to this polymerization grade to described user terminal.
8. method as claimed in claim 7, is characterized in that, network side, according to the channel quality of the control area of described user terminal to send up, is determined corresponding polymerization grade, is specially:
Network side, by inquiring about the mapping relations table of control area channel quality information and polymerization grade, determines the polymerization grade corresponding with the channel quality information of described user terminal to send up.
9. the method as described in claim 2 or 8, is characterized in that, in described mapping relations table, according to channel quality order from high to low, the CCE quantity of corresponding polymerization grade from small to large.
10. a user terminal, is characterized in that, comprising:
First determining unit, for the channel quality according to the control area detected, determines the polymerization grade corresponding with described channel quality;
Second determining unit, for the polymerization grade determined according to described first determining unit, the blind check order of polymerization grade when determining to carry out blind Detecting to control channel;
Blind Detecting unit, for the blind check order of the polymerization grade determined according to described second determining unit, carries out blind Detecting to control channel;
Wherein, described second determining unit specifically for, the polymerization grade corresponding with the channel quality detected is ranked the first, arranges corresponding polymerization grade according to the order that the channel quality matching degree detected reduces thereafter.
11. user terminals as claimed in claim 10, it is characterized in that, described first determining unit specifically for, by the inquiry channel quality of control area and the mapping relations table of polymerization grade, determine the polymerization grade corresponding with the channel quality of the control area detected.
12. user terminals as claimed in claim 10, is characterized in that, described blind Detecting unit specifically for, first determine search volume according to the polymerization grade that ranks the first, and carry out blind Detecting in this search volume; If fail to detect the control channel of this user terminal, then determine search volume according to next polymerization grade, and carry out blind check in this search volume, by that analogy, until the control channel of this user terminal detected or until reach maximum blind check number of times.
13. user terminals as claimed in claim 10, is characterized in that, also comprise:
Channel quality detection unit, for measuring the broadband channel quality of the top n orthogonal frequency division multiplex OFDM symbol of descending sub frame; Or, measure the top n OFDM symbol of descending sub frame but do not comprise the broadband channel quality of the Resource Unit RE that physical mixed ARQ indicating channel PHICH and Physical Control Format Indicator Channel PCFICH takies; Wherein, N is indicated by Physical Control Format Indicator Channel PCFICH, and N is 1,2,3 or 4.
14. user terminals as claimed in claim 10, is characterized in that, also comprise:
Report unit, for before carrying out blind Detecting, by the information reporting of the channel quality of control area that detects to network side.
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| CN201010173837.8A CN102244885B (en) | 2010-05-10 | 2010-05-10 | Blind detection method and device for control channel |
| PCT/CN2011/073314 WO2011134385A1 (en) | 2010-04-30 | 2011-04-26 | Method for reporting channel quality, method for control channel blind detection and configuration and device therefor |
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| CN201010173837.8A CN102244885B (en) | 2010-05-10 | 2010-05-10 | Blind detection method and device for control channel |
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