CN104734809B - A kind of method for mapping resource and the blind detection method based on the method for mapping resource - Google Patents
A kind of method for mapping resource and the blind detection method based on the method for mapping resource Download PDFInfo
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- CN104734809B CN104734809B CN201510102151.2A CN201510102151A CN104734809B CN 104734809 B CN104734809 B CN 104734809B CN 201510102151 A CN201510102151 A CN 201510102151A CN 104734809 B CN104734809 B CN 104734809B
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Abstract
The present invention discloses a kind of method for mapping resource and the blind detection method based on the method for mapping resource, user is quickly located in the resource location that polymerization grade is R according to the RNTI value of oneself, then detection current information whether be user information, if it is not, traversing the resource information for the other positions that polymerization grade is R again.If do not found yet, the resource information of other polymerization grades is traversed, until finding oneself DCI information；The present invention is mapped by comprehensive resources DCI and blind examination strategy two parts, the location information of user DCI can quickly be positioned, and reduce the blind examination number of user side PDCCH, it can reduce the blind examination number of user side PDCCH by means of the present invention, reduce delay, the processing speed of terminal is improved, is necessary for the system more demanding to time delay this to LTE.
Description
Technical field
The invention belongs to fields of communication technology, and in particular to Downlink Control Information mapping method, PDCCH blind checking method.
Background technique
With the continuous development and evolution of mobile communication technology, 3GPP starts starting in November, 2004, and " third generation is mobile
Communication system long term evolution " LTE project, to realize smooth transition of the 3G technology to 4G.The Further aim of LTE is that realization is higher
Data rate, shorter time delay, lower cost, higher power system capacity and improved coverage area.
In LTE (Long Term Evolution) system, Downlink Control Information (DCI) is mainly used for bearing downlink tune
Spend distribution principle, uplink scheduling request, power control command.DCI can be carried on PDCCH (Physical Downlink
Control Channel, Physical Downlink Control Channel) on.PDCCH can then carry logically continuous L CCE (Control
Channel Element, control channel unit) on.L is polymerization grade.L value can be 8,4,2,1.
LTE system is that each user (UE) defines one group of limited running time-frequency resource position in subframe and carry DCI.Due to upper
The interaction of downlink needs while dispatching multiple UE, i.e. base station and UE is one-to-many relationship, multiple scheduling of whole system
Information (DCI) is issued to each UE by PDCCH channel.Therefore, LTE system must be supported to send multiple scheduling in a subframe
Message (namely DCI).
In existing LTE system, down direction, the wireless communication between base station and UE uses following mode: in downlink
Direction, the wireless sub-frame that base station is sent are divided into control section and data portion, base station be sent to each user DCI and lower line number
It is believed that breath is individually placed to control section and the data portion of wireless sub-frame.In the side UE, user is if it is intended to obtain the data of oneself
Information, it is necessary to the DCI information of oneself is first obtained, because DCI information indicates the storage position of data information.In existing LTE
In system, base station be do not notify UE to issue DCI corresponding to polymerization grade, base station also do not notify carrying DCI CCE above-mentioned
Specific location in one group of limited running time-frequency resource position.Therefore, UE needs logical in public search space and dedicated search space
Blind examination is crossed to attempt to solve DCI information.
In LTE system, the blind examination region of carrying DCI information is public search space and UE dedicated search space, is shown in Table
1.1。
Common search section refers to that all UE require the section monitored, and pages commonly used to send, RAR, system message,
And common uplink power control message of part UE etc..It is 16 that common search section, which is occupied since 0 to maximum number,
CCE, the PDCCH in common search section only have the two kinds of size of 4CCE and 8CCE, and UE needs in common search section,
Since 0, is scanned for 2 times by CCE granularity for 8, be 4 search 4 times by CCE granularity, at most need to carry out searching for 6 PDCCH
Rope, since there are two types of formats for each DCI information, so at most needing to carry out searching for 12 PDCCH in total in public search space
Rope.
UE dedicated search space shares 4, respectively 1 according to polymerization grade, and the search of 2,4,8 this 4 polymerization grades is empty
Between, as shown in table 1.The dedicated search space of UE maps to obtain the initial position under corresponding polymerization grade by HASH, that is, polymerize
The different search space of grade is in different initial positions.Base station side is put into the DCI information of multiple UE of same polymeric grade
In the dedicated search space of corresponding polymerization grade.Therefore in this 4 dedicated search spaces, there are the DCI information of multiple UE, and
The purpose of blind examination is that the DCI information of UE oneself is found in these complicated search spaces.
In terms of blind examination, agreement provides it is the DCI information for successively traversing the different search space of polymerization grade, until finding
The DCI of oneself.In this way if user will obtain DCI information, at most want just obtain for blind examination 44 times, and clock synchronization this for LTE
Prolong more demanding system to be difficult to receive, therefore how to reduce blind examination number, becomes current research hot topic.
Current blind examination technical research primarily focuses on the research of polymerization grade preferentially selected, and basic ideas are UE lateral roots
Speculate that base station may distribute to the size (polymerization grade) of the shared resource of the DCI information of UE according to certain algorithm, then UE
Detection DCI information is gone in the search space of corresponding polymerization grade.But these emphasis are not considered on blind examination strategy
The combination of DCI mapping and blind examination strategy.`
Summary of the invention
For the above-mentioned technical problem of solution, the present invention proposes a kind of method for mapping resource and based on the method for mapping resource
Blind detection method.
The present invention is technical solution used by solving its technical problem are as follows:
A kind of method for mapping resource, the specific steps are as follows:
S01: base station is according to the channel quality indicator CQI of user ii, distribution can bearing resource CCE number, and obtain pair
The polymerization grade R answered；
S02: first mapping, CCE number, polymerization grade R and the correspondence that the user i obtained according to step S01 is distributed
User identifier RNTIi, resource is mapped, specific formula is as follows:
Li=LstartiR+RNTIi modNuersR*R；
Wherein, LiFor the position of the DCI mapping of i-th of user, LstartiRExpression user i is rising on R in polymerization grade
Beginning position, RNTIiFor user's sign value of user i, NuersRThe potential user's number for being R for polymerization grade, R are to distribute to user i
CCE number；
S03: Quadratic Map, when according to formula Li=LstartiR+RNTIi modNuersR* R obtains the money of different user
When source mapping position is identical, new user is saved, polymerization grade correspondence is mapped to according to the corresponding polymerization grade of new user and is searched
The other positions in rope space.
The present invention also provides a kind of blind detection methods based on method for mapping resource, specifically includes the following steps:
S1: the channel quality indicator CQI reported according to user iiObtain polymerization grade R, according to obtained polymerization grade R,
The current location of polymerization grade R is calculated, and current location is scanned for, if finding resource, searches for success, otherwise holds
Row step S2；
S2: the rest position of traversal polymerization grade R searches for success if finding resource, no to then follow the steps S3；
S3: traversal removes the search space of the remaining polymerization grade of polymerization grade R, finds resource.
Further, the step S1 further include: S10: channel quality indicator CQI is establishediWith the mapping of search grade R.
Further, the current location of search grade R described in step S1 is by formula: Li=LstartiR+RNTIi
modNuersR* R is determined.
Beneficial effects of the present invention: a kind of method for mapping resource of the invention and the blind examination based on the method for mapping resource
Method, user are quickly located in the resource location that polymerization grade is R according to the RNTI value of oneself, then whether detect current information
For the information of user, if it is not, traversing the resource information for the other positions that polymerization grade is R again.If do not found yet, time
The resource information for going through other polymerization grades, until finding oneself DCI information；The present invention is mapped and blind by comprehensive resources DCI
Tactful two parts are examined, the location information of user DCI can be quickly positioned, and reduce the blind examination number of user side PDCCH, pass through
Method of the invention can reduce the blind examination number of user side PDCCH, reduces delay, improves the processing speed of terminal, to LTE this
It is necessary for the kind system more demanding to time delay.
Detailed description of the invention
Fig. 1 is the resource impact flow chart of the present invention program.
Fig. 2 is the blind examination flow chart of the present invention program.
Fig. 3 is resource impact detailed step block diagram provided in an embodiment of the present invention.
Fig. 4 is PDCCH blind examination detailed step block diagram provided in an embodiment of the present invention.
Specific embodiment
For convenient for those skilled in the art understand that technology contents of the invention, with reference to the accompanying drawings and examples, to this hair
Bright content is described in further detail.
The solution of the present invention are as follows: a kind of resource (DCI) mapping method and the blind detection method based on the method for mapping resource.
It is as shown in Figure 1 the flow chart of resource impact, DCI mapping scheme of the invention includes:
S01: base station is according to the channel quality indicator CQI of user ii, distribution can bearing resource CCE number；Base station according to
The CQI (Channel Quality Indication) of user to be dispatched, distribution can carry the number of the CCE of DCI information.
It in terms of distributing CCE, can be distributed according to the CQI information of each user, specific distribution is shown in Table 1.2.It is substantially former
Reason is when CQI value is bigger, and corresponding channel quality is better, DCI information can be sent with seldom resource, therefore distribute
It is just few to the CCE number of the user.
S02: first mapping, the CCE number and corresponding user identifier that the user i obtained according to step S01 is distributed
RNTIi, resource is mapped；
Li=LstartiR+RNTIi modNuersR*R；
The number of the CCE distributed according to user and corresponding RNTIiIt is worth (user's mark) and carries out DCI mapping.
Li=LstartiR+RNTIi modNuersR* R formula 1.1
LiFor the position to be put the DCI of i-th of user, LstartiRIndicate user i in the start bit that polymerization grade is on R
It sets, RNTIiFor user's sign value of user i, NuersRThe potential user's number for being R for polymerization grade, R are to distribute to user i
CCE number.Wherein, RNTIi is user's sign value of user i, and each user has the RNTI of oneself, be user and base station into
When row access connection, distribute to each user's by base station；LstartiRSpecific calculation is the RNTI value, poly- by user
It closes grade and subframe numbers is calculated according to certain hash, this is the prior art, due to not being the emphasis of this paper, so only making
Simple declaration.
The DCI mapping position of user i known to formula 1.1.Such as assume that user i is assigned with 2 CCE for its to be corresponding
DCI information, the position of the put resource of user i should be the initial position for the CCE that polymerization grade is 2 plus user RNTIiMould is potential
Number of users multiplied by polymerization grade result.
LstartiRUser i is indicated in the initial position that polymerization grade is on R, regulation is by subframe numbers, polymerization in the protocol
What grade etc. was calculated according to hash, since the present invention lays particular emphasis on blind examination strategy, hash calculating is not just further related to.Pass through formula
The DCI information MAP of user to corresponding position can be completed resource impact by 1.1 base stations.
S03: Quadratic Map, when according to formula Li=LstartiR+RNTIi modNuersR* R obtains the money of different user
When source mapping position is identical, new user is saved, polymerization grade correspondence is mapped to according to the corresponding polymerization grade of new user and is searched
The other positions in rope space.
In the mapping process of DCI, it is possible that two users are mapped to the same resource location, thus generate
Resource contention, when conflict generate when, the new user for generating conflict is preserved.The user for generating conflict in first mapping
Other empty positions of the corresponding search space of the polymerization grade are mapped to according to its corresponding polymerization grade.It completes entirely to reflect with this
Penetrate process.
The division of 1.1 search space LTE of table and detailed description table
The mapping table of table 1.2 CQI and polymerization grade
| User's CQI value | Polymerization grade (number of distribution CCE) |
| 0-3 | 8 |
| 4-7 | 4 |
| 8-11 | 2 |
| 12-15 | 1 |
It is illustrated in figure 3 the detailed step block diagram of resource impact provided in an embodiment of the present invention, it is assumed that user to be dispatched is total
Number is that N corresponds to specific polymerization grade according to mapping relations, pass through formula according to the size of the CQI of each user to be dispatched
1.1 find resource location, check whether resource location is occupied, if unoccupied, the DCI information of user i is put into this
Resource location, continues checking whether i is less than or equal to N, if so then execute i=i+1, continues to reflect next user progress resource
It penetrates, when the resource location that user is found by formula 1.1 is occupied, then the user is put into conflict queue, when having mapped
After having the user of non conflicting, check conflict queue when not being sky, then the user in the queue that conflicts according to its corresponding polymerization grade,
Other positions corresponding to the polymerization grade are mapped to, terminates to map until having mapped all users in conflict queue, works as inspection
Find conflict queue then terminates to map for sky.
On the basis of combining DCI mapping, the embodiment of the present invention provides a kind of blind detection method, as shown in Fig. 2, specifically including
Following steps.
S1: the channel quality indicator CQI reported according to user iiObtain polymerization grade R, according to obtained polymerization grade R,
Current location is calculated, and current location is scanned for, if finding resource, searches for success, it is no to then follow the steps S2；
The searching position of user i carries out blind examination according to polymerization grade, and the size prediction base station of the CQI reported according to oneself can
The size R (R value is 1,2,4,8) that the CCE of oneself can be distributed to, then obtain user's according to polymerization grade R and formula 1.1
Searching position LiIf searching for the resource less than oneself, turns S2, if searched for successfully, terminate blind examination.
S2: the rest position of traversal polymerization grade R searches for success if finding resource, no to then follow the steps S3；
User i searches for the resource of oneself in the other positions of polymerization grade R, terminates if finding, if it can not find
Turn S3.
S3: traversal removes the search space of the remaining polymerization grade of polymerization grade R, finds resource.User i is according to S1, S2
Successively traversal removes other search spaces after polymerization grade R.Terminate blind examination if finding, can not find, continues.
It is illustrated in figure 4 the detailed step block diagram of blind examination provided in an embodiment of the present invention, user is according to the CQI reported first
Determine base station can the space of usable polymerization grade carry corresponding DCI, the search space of user's traversal search polymerization grade
The position for finding oneself finds the position Luser of oneself according to formula 1.1, detects whether the DCI is certainly at the Luser of position
Oneself DCI information, if then terminating to search for, the other positions for otherwise continuing the search space for traversing the polymerization grade are detected whether
There is the DCI information of oneself, if then terminating to search for, otherwise judges to subtract the polymerization grade being searched in the set of search space
Whether the set behind search space is sky, if it is empty then terminates to search for, otherwise takes a smallest polymerization grade in the set
Search space, traversal find the position of oneself, and the position Luser of oneself is found according to formula 1.1, examine at the Luser of position
Survey whether the DCI is the DCI information of oneself, if then terminating to search for, otherwise in other positions of the search space of this polymerization grade
The DCI information for detecting whether oneself is set, if then terminating to search for, otherwise returns to judge to subtract in the set of search space and be searched
Whether be sky, continue searching the search space of other polymerization grades if gathering behind the polymerization grade space of rope.
In blind detection method, user is quickly located in the resource location that polymerization grade is R according to the RNTI value of oneself, then
Detection current information whether be user information, if it is not, traversal polymerization grade be R other positions resource information.
If it is not, then traverse the resource information of other polymerization grades, until finding oneself DCI information.
In summary, the present invention passes through comprehensive DCI mapping and blind examination strategy two parts, proposes a kind of method for mapping resource
And the blind detection method based on the method for mapping resource, it can reduce the blind examination number of the side UE PDCCH by the method, reduction is prolonged
When, the processing speed of terminal is improved, is necessary for the system more demanding to time delay this to LTE.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.For ability
For the technical staff in domain, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should be included within scope of the presently claimed invention.
Claims (2)
1. a kind of blind detection method based on method for mapping resource, which is characterized in that specifically includes the following steps:
S01: base station is according to the channel quality indicator CQI of user ii, distribution can bearing resource CCE number, and obtain it is corresponding gather
Close grade R；
S02: first mapping, CCE number, polymerization grade R and the corresponding use that the user i obtained according to step S01 is distributed
Family identifies RNTIi, resource is mapped, specific formula is as follows:
Li=LstartiR+RNTIimodNuersR*R；
Wherein, LiFor the position of the DCI mapping of i-th of user, LstartiRIndicate user i in the start bit that polymerization grade is on R
It sets, RNTIiFor user's sign value of user i, NuersRThe potential user's number for being R for polymerization grade, R are to distribute to user i
CCE number；
S03: Quadratic Map, when according to formula Li=LstartiR+RNTIimodNuersR* R obtains the resource impact of different user
When position is identical, new user is saved, which is mapped to according to the corresponding polymerization grade of new user and corresponds to search space
Other positions；
S10: channel quality indicator CQI is establishediWith the mapping relations of polymerization grade R；
S1: the channel quality indicator CQI reported according to user iiIt obtains polymerization grade R, according to obtained polymerization grade R, calculates
It is scanned for the current location of polymerization grade R, and to current location, if finding resource, searches for success, it is no to then follow the steps
S2；
The current location of polymerization grade R is by formula described in step S1: Li=LstartiR+RNTIimodNuersR* R is determined；
S2: the rest position of traversal polymerization grade R searches for success if finding resource, no to then follow the steps S3；
S3: traversal removes the search space of the remaining polymerization grade of polymerization grade R, finds resource.
2. the method according to claim 1, wherein the polymerization grade R value be 8 or 4 or 2 or 1, it is each etc.
Grade value indicates the channel quality indicator CQI according to reporting of useriThe CCE number distributed.
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| WO2019136689A1 (en) * | 2018-01-12 | 2019-07-18 | Qualcomm Incorporated | Resolutions for aggregation level ambiguity of physical downlink control channel (pdcch) transmissions |
| CN110149176A (en) * | 2018-02-12 | 2019-08-20 | 普天信息技术有限公司 | A kind of multi-subband down control channel sending method and base station |
| CN112803979B (en) | 2018-05-09 | 2023-01-17 | Oppo广东移动通信有限公司 | Wireless communication method and terminal |
| CN111130694B (en) * | 2019-12-04 | 2022-05-03 | 重庆邮电大学 | PDCCH blind detection method and system for low-delay clustering |
| CN113055123B (en) * | 2019-12-27 | 2022-07-12 | 中国电信股份有限公司 | Blind detection method, system and terminal |
| US20230262527A1 (en) * | 2020-07-28 | 2023-08-17 | Beijing Xiaomi Mobile Software Co., Ltd. | Channel parameter determination method and apparatus, and storage medium |
| CN114079546B (en) * | 2020-08-12 | 2024-05-28 | 深圳市中兴微电子技术有限公司 | Channel information processing method, device, equipment and storage medium |
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| CN102547996B (en) * | 2009-06-16 | 2013-12-04 | 华为技术有限公司 | Method and device for mapping control channels |
| CN101702828B (en) * | 2009-11-03 | 2013-01-02 | 中兴通讯股份有限公司 | Resource distribution method and system, and blind detecting method, base station and user device |
| CN104219036B (en) * | 2014-09-30 | 2017-11-14 | 北京北方烽火科技有限公司 | EPDCCH blind checking methods, method for mapping resource and device |
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