CN105490779B - Physical Downlink Control Channel blind checking method - Google Patents

Physical Downlink Control Channel blind checking method Download PDF

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Publication number
CN105490779B
CN105490779B CN201510926625.5A CN201510926625A CN105490779B CN 105490779 B CN105490779 B CN 105490779B CN 201510926625 A CN201510926625 A CN 201510926625A CN 105490779 B CN105490779 B CN 105490779B
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cce
effective
temporary identifier
network temporary
search space
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CN201510926625.5A
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Chinese (zh)
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CN105490779A (en
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曹慧
陈丽
徐旭东
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上海创远仪器技术股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038Blind format detection

Abstract

The present invention relates to a kind of Physical Downlink Control Channel blind checking methods, wherein the method includes the following steps:(1) effective position CCE of data and the size of effective CCE in Physical Downlink Control Channel are obtained;(2) according to the initial position N of CCE in search spaceCCEstartDetermine the set of radio network temporary identifier RNTI;(3) CRC check is carried out to obtain the value of valid wireless Network Temporary Identifier RNTI to the set of the radio network temporary identifier RNTI.Using the Physical Downlink Control Channel blind checking method of this kind of structure, channel equalization, demodulation descrambling only handle primary, algorithm is realized simple, it is effectively reduced the number of solution rate-matched and folding coding, improve the efficiency of blind examination, candidate RNTI set is determined according to search space CCE initial position, be ensure that CRC check is only handled possible RNTI value, is further improved the efficiency of blind examination.

Description

Physical Downlink Control Channel blind checking method

Technical field

The present invention relates to field of communication technology more particularly to blind examination, in particular to a kind of Physical Downlink Control Channel blind examinations Survey method.

Background technique

In LTE (Long Term Evolution) system, PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) bearing downlink control information (DCI, downlink control information), Such as upstream dispatching instructions, downlink data transmission instruction, common control information, it is correct demodulation and decoding be business datum just True received premise.By the way of multiple users share resource, terminal is needed in entire control area with one for the design of PDCCH Determine rule search control signaling.In a downlink subframe, multiple DCI carry out coding and rate matching procedure, by coded-bit The operation such as scrambled jointly after multiplexing, modulate and interweave.

Current PDCCH blind checking method is for UE (User, user), and this method is by known RNTI (Radio Network Tempory Identity, radio network temporary identifier) calculates the initial position of DCI information, then right All polymerization grade traversals are primary, CRC validation carried out to decoding result using RNTI, to obtain one's own DCI information. The calculation formula of specific search space is as follows:

Wherein L indicates polymerization grade;K indicates the subframe number in a radio frames;NCCE,kIndicate k-th of subframe control zone Total CCE number in domain;M indicates candidate PDCCH set, i=0 ..., L-1.

For public search space Yk=0;For user's dedicated search space, YkIt is relevant to RNTI and subframe number One value, is defined as:Yk=(A × Yk-1) mod D, wherein Y-1=nRNTI, A=39827, D=65537.

In the case where each user RNTI is unknown, if needing that (RNTI range is to all RNTI using existing method It 1-65535) calculates one time, for existing level of hardware, operation time can be considerably long.

Summary of the invention

The purpose of the present invention is overcoming the above-mentioned prior art, provides one kind and be able to solve existing PDCCH The low Physical Downlink Control Channel blind checking method of blind Detecting blind detection efficiency in the case where RNTI is unknown.

To achieve the goals above, Physical Downlink Control Channel blind checking method of the invention has following constitute:

The Physical Downlink Control Channel blind checking method, is mainly characterized by, and the method includes the following steps:

(1) effective position CCE of data and the size of effective CCE in Physical Downlink Control Channel are obtained;

(2) according to the initial position N of CCE in search spaceCCEstartDetermine the set of radio network temporary identifier RNTI;

(3) CRC check is carried out to obtain valid wireless network to the set of the radio network temporary identifier RNTI The value of temporary identifier RNTI.

Further, the step (1) specifically includes following steps:

(1.1) to the data in the Physical Downlink Control Channel of acquisition carry out solution resource impact, solution layer mapping, deinterleave, Demodulation and scramble process, to obtain the multiplexed data of Downlink Control Information DCI;

(1.2) the multiplexed data of Downlink Control Information DCI are handled to obtain effective position CCE and effective CCE Size.

Further, the step (1.2) specifically includes following steps:

(1.2.1) carries out power calculation to the data after descrambling;

(1.2.2) sums up the power of continuous eight data informations, to obtain the general power of a REG;

The general power that (1.2.3) obtains the REG is greater than the position REG of threshold value, and obtains effective REG number NREGuse, effective REG is that the general power of REG is greater than the REG of threshold value.

Still further, the step (2) specifically includes following steps:

(2.1) the initial position N of CCE is obtained in the search space according to effective REGCCEstart

(2.2) set of radio network temporary identifier RNTI is determined according to the initial position of CCE.

Still further, the step (2.1) specifically includes following steps:

(2.1.1) is according to effective REG several NREGuseIt calculates and obtains effective CCE number:

NCCEuse=NREGuse/9

(2.1.2) is defined according to the effective CCE several sizes to the search space;

(2.1.3) determines the initial position N of CCE according to the size of the search spaceCCEstart

Still further, the step (2.1.2) is specially:

When the number of the effective CCE is more than or equal to 8, the search space is [8 42 1];

When the number of the effective CCE is more than or equal to 4 and when less than 8, the search space is [4 2 1];

When the number of the effective CCE is more than or equal to 2 and when less than 4, the search space is [2 1];

When the number of the effective CCE is less than 2, the search space is [1].

Still further, the step (2.2) specifically includes following steps:

(2.2.1) successively carries out blind Detecting to possible search space size;

The initial position N for the CCE that (2.2.2) is determined according to current search spaceCCEstartDetermine possible Yk,tempValue

Wherein,M=0~M(L)-1;L indicates polymerization grade;K expression one is wireless Subframe number in frame, m=0 ..., M-1, M are the number of the Physical Downlink Control Channel candidate monitored in search space, NCCE, k For the CCE total number in the control domain of subframe k;

(2.2.3) basis recycles the value of radio network temporary identifier RNTI and passes through radio network temporary identifier RNTI calculates the value of Yk;

Whether the value of (2.2.4) judgement Yk is equal to Yk,temp

(2.2.5) is if the value of the Yk is equal to Yk,temp, then the value of radio network temporary identifier RNTI is stored in The set of radio network temporary identifier RNTI;

(2.2.6) is if the value of the Yk is not equal to Yk,temp, then the value of radio network temporary identifier RNTI is abandoned.

Still further, the step (3) specifically includes following steps:

(3.1) data in current search space are obtained, and carry out solution rate-matched and decoding processing;

(3.2) value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI is recycled Processing, and radio network temporary identifier RNTI descrambling and CRC check are carried out to decoding treated data;

(3.3) if CRC check is correct, the value and Downlink Control Information of radio network temporary identifier RNTI are exported DCI information, and terminate to recycle the value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI;

(3.4) if CRC check mistake, continue step (3.2).

Using the Physical Downlink Control Channel blind checking method in the invention, compared with prior art, have below Beneficial technical effect:

The present invention is not grouped data, and therefore, channel equalization, demodulation descrambling only handle primary, algorithm realization letter It is single;Solution rate-matched and folding coding operation are carried out according to the data of search space, is effectively reduced solution rate-matched and volume The number of product decoding, improves the efficiency of blind examination;Candidate RNTI set is determined according to search space CCE initial position, ensure that CRC check is only handled possible RNTI value, further improves the efficiency of blind examination.

Detailed description of the invention

Fig. 1 is the step flow chart of Physical Downlink Control Channel blind checking method of the invention.

Fig. 2 is the step flow chart that the method for effective CCE is determined in one embodiment of the invention.

Fig. 3 is the step process that the method for set of radio network temporary identifier RNTI is determined in one embodiment of the invention Figure.

Fig. 4 is to carry out CRC check to the set of the radio network temporary identifier RNTI in one embodiment of the invention Method step flow chart.

Specific embodiment

It is further to carry out combined with specific embodiments below in order to more clearly describe technology contents of the invention Description.

Refering to Figure 1, Physical Downlink Control Channel blind checking method of the invention includes the following steps:

(1) effective position CCE of data and the size of effective CCE in Physical Downlink Control Channel are obtained;

(2) according to the initial position N of CCE in search spaceCCEstartDetermine the set of radio network temporary identifier RNTI;

(3) CRC check is carried out to obtain valid wireless network to the set of the radio network temporary identifier RNTI The value of temporary identifier RNTI.

In a preferred embodiment, it please refers to shown in Fig. 2, the step (1) specifically includes following steps:

(1.1) to the data in the Physical Downlink Control Channel of acquisition carry out solution resource impact, solution layer mapping, deinterleave, Demodulation and scramble process, to obtain the multiplexed data of Downlink Control Information DCI;

(1.2) the multiplexed data of Downlink Control Information DCI are handled to obtain effective position CCE and effective CCE Size.

In a kind of more preferably embodiment, the step (1.2) specifically includes following steps:

(1.2.1) carries out power calculation to the data after descrambling;

(1.2.2) sums up the power of continuous eight data informations, to obtain the general power of a REG;

The general power that (1.2.3) obtains the REG is greater than the position REG of threshold value, and obtains effective REG number NREGuse, effective REG is that the general power of REG is greater than the REG of threshold value.

In a preferred embodiment, it please refers to shown in Fig. 3, the step (2) specifically includes following steps:

(2.1) the initial position N of CCE is obtained in the search space according to effective REGCCEstart

(2.2) set of radio network temporary identifier RNTI is determined according to the initial position of CCE.

In a kind of more preferably embodiment, the step (2.1) specifically includes following steps:

(2.1.1) is according to effective REG several NREGuseIt calculates and obtains effective CCE number:

NCCEuse=NREGuse/9

(2.1.2) is defined according to the effective CCE several sizes to the search space;

(2.1.3) determines the initial position N of CCE according to the size of the search spaceCCEstart

In a kind of more preferably embodiment, the step (2.1.2) is specially:

When the number of the effective CCE is more than or equal to 8, the search space is [8 42 1];

When the number of the effective CCE is more than or equal to 4 and when less than 8, the search space is [4 2 1];

When the number of the effective CCE is more than or equal to 2 and when less than 4, the search space is [2 1];

When the number of the effective CCE is less than 2, the search space is [1].

In a kind of more preferably embodiment, the step (2.2) specifically includes following steps:

(2.2.1) successively carries out blind Detecting to possible search space size;

The initial position N for the CCE that (2.2.2) is determined according to current search spaceCCEstartDetermine possible Yk,tempValue

Wherein,M=0~M(L)-1;L indicates polymerization grade;K expression one is wireless Subframe number in frame, m=0 ..., M-1, M are the number of the Physical Downlink Control Channel candidate monitored in search space, NCCE, k For the CCE total number in the control domain of subframe k;It is that the OFDM symbol number occupied according to PDCCH calculates total RE resource, then subtracts The occupied RE resource of CRS, PCFICH, PHICH is gone, the available RE resource of PDCCH is acquired, RE sum is exactly CCE total divided by 36 Number.

(2.2.3) basis recycles the value of radio network temporary identifier RNTI and passes through radio network temporary identifier RNTI calculates the value of Yk;

Whether the value of (2.2.4) judgement Yk is equal to Yk,temp

(2.2.5) is if the value of the Yk is equal to Yk,temp, then the value of radio network temporary identifier RNTI is stored in The set of radio network temporary identifier RNTI;

(2.2.6) is if the value of the Yk is not equal to Yk,temp, then the value of radio network temporary identifier RNTI is abandoned.

In a preferred embodiment, it please refers to shown in Fig. 3, the step (3) specifically includes following steps:

(3.1) data in current search space are obtained, and carry out solution rate-matched and decoding processing;

(3.2) value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI is recycled Processing, and radio network temporary identifier RNTI descrambling and CRC check are carried out to decoding treated data;

(3.3) if CRC check is correct, the value and Downlink Control Information of radio network temporary identifier RNTI are exported DCI information, and terminate to recycle the value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI;

(3.4) if CRC check mistake, continue step (3.2).

In practical applications, a kind of physical downlink control channel PDCCH blind checking method is present embodiments provided, including:

Step 1 obtains effective position CCE and the size of effective CCE of PDCCH.Received data are reflected by solution resource It penetrates, solve the relevant treatments acquisition multiplexed data of DCI such as layer is mapped, deinterleaved, demodulation descrambles, to the multiplexed data of DCI It carries out judgement and obtains the effective position REG and the size of effective REG.

Step 2 determines candidate RNTI set according to the initial position of possible search space CCE.According to the big of effective REG It is small that possible search space size is defined, so that it is determined that the initial position of possible search space CCE, and it is empty according to search Between calculation formula RNTI value possible under same polymeric grade is defined, determine candidate RNTI gather.

Step 3 gathers candidate RNTI and carries out CRC (Cyclic Redundancy Check, cyclic redundancy check) Verification searches out effective RNTI.Data in search space are handled by solution rate-matched and decoding, then to candidate RNTI collection It closes and carries out blind examination CRC check, effective RNTI value is determined according to CRC check result.

Wherein, the determination method of effective REG is as shown in Figure 2.Steps are as follows:

(a.1) power calculation is carried out to the data after descrambling.Since data are demodulated, each RE resource has two-way Data information;

(a.2) power of continuous 8 data informations is summed up, seeks the general power of a REG, in the money of PDCCH REG is indivisible unit in the distribution of source, therefore calculates the general power of REG;

(a.3) REG power is compared with threshold value, selects effective position REG greater than threshold value, and count effective The number N of REGREGuse

Secondly, determining the method for candidate RNTI set as shown in figure 3, steps are as follows:

(b.1) according to the number N of effective REGREGuseCalculate effective CCE number, NCCEuse=NREGuse/9;

(b.2) according to effective CCE several NCCEuseSize search space size is defined.If being greater than effective CCE number be greater than 8, then search space be [8 42 1];If effective CCE number is [4,8) in, then search is empty Between be [4 2 1];If effective CCE number [2,4) it is interior, then search space is [2 1];If effective CCE number Less than 2, then search space is [1].

(b.3) at the beginning of the CCE for successively carrying out blind examination to possible search space size, and being determined according to current search space Beginning position NCCEstartDetermine the value of possible Yk, formula is as follows

Wherein,M=0~M(L)-1;L indicates polymerization grade;K expression one is wireless Subframe number in frame, m=0 ..., M-1, M are the number of the Physical Downlink Control Channel candidate monitored in search space, NCCE, k For the CCE total number in the control domain of subframe k;;

(b.4) it determines candidate RNTI set, the value of RNTI is recycled, if passing through the value etc. of the calculated Yk of RNTI In Yk,temp, then this RNTI is put into candidate RNTI.

Furthermore RNTI checking process figure is as shown in figure 4, steps are as follows:

(c.1) data in current search space are taken out, and carry out solution rate-matched and decoding processing;

(c.2) circular treatment is carried out to the value in candidate RNTI set, RNTI descrambling and the school CRC is carried out to data after decoding It tests;

(c.3) if verification is correct, effective RNTI value and DCI information, and end loop are exported, if verification is wrong Accidentally, then it returns (c.2), until all candidate RNTI are traversed one time.

Using the Physical Downlink Control Channel blind checking method in the invention, compared with prior art, have below Beneficial technical effect:

The present invention is not grouped data, and therefore, channel equalization, demodulation descrambling only handle primary, algorithm realization letter It is single;Solution rate-matched and folding coding operation are carried out according to the data of search space, is effectively reduced solution rate-matched and volume The number of product decoding, improves the efficiency of blind examination;Candidate RNTI set is determined according to search space CCE initial position, ensure that CRC check is only handled possible RNTI value, further improves the efficiency of blind examination.

In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make Various modifications and alterations are without departing from the spirit and scope of the invention.Therefore, the description and the appended drawings should be considered as illustrative And not restrictive.

Claims (2)

1. a kind of Physical Downlink Control Channel blind checking method, which is characterized in that the method includes the following steps:
(1) effective position CCE of data and the size of effective CCE in Physical Downlink Control Channel are obtained;Including following step Suddenly:
(1.1) to the data in the Physical Downlink Control Channel of acquisition carry out solution resource impact, solution layer mapping, deinterleave,
Demodulation and scramble process, to obtain the multiplexed data of Downlink Control Information DCI;
(1.2.1) carries out power calculation to the data after descrambling;
(1.2.2) sums up the power of continuous eight data informations, to obtain the general power of a REG;
The general power that (1.2.3) obtains the REG is greater than the position REG of threshold value, and obtains effective REG several NREGuse, institute The effective REG stated is that the general power of REG is greater than the REG of threshold value;
(1.2) the multiplexed data of Downlink Control Information DCI are handled to obtain the big of effective position CCE and effective CCE It is small;
(2) according to the initial position N of CCE in search spaceCCEstartDetermine the set of radio network temporary identifier RNTI;Wherein wrap Include following steps:
(2.1) the initial position N of CCE is obtained in the search space according to effective REGCCEstart
(2.1.1) is according to effective REG several NREGuseIt calculates and obtains effective CCE number:
NCCEuse=NREGuse/9
(2.1.2) is defined according to the effective CCE several sizes to the search space;
(2.1.3) determines the initial position N of CCE according to the size of the search spaceCCEstart
(2.2) set of radio network temporary identifier RNTI is determined according to the initial position of CCE;
(2.2.1) successively carries out blind Detecting to possible search space size;
The initial position N for the CCE that (2.2.2) is determined according to current search spaceCCEstartDetermine possible Yk,tempValue
Wherein,M=0~M(L)-1;L indicates polymerization grade;K is indicated in a radio frames Subframe number, m=0 ..., M-1, M are the number of the Physical Downlink Control Channel candidate monitored in search space, NCCE,kFor subframe CCE total number in the control domain of k;
(2.2.3) recycle and count by radio network temporary identifier RNTI according to the value of radio network temporary identifier RNTI Calculate the value of Yk;
Whether the value of (2.2.4) judgement Yk is equal to Yk,temp
(2.2.5) is if the value of the Yk is equal to Yk,temp, then the value of radio network temporary identifier RNTI is stored in wirelessly The set of Network Temporary Identifier RNTI;
(2.2.6) is if the value of the Yk is not equal to Yk,temp, then the value of radio network temporary identifier RNTI is abandoned;
(3) interim to obtain valid wireless network to the set progress CRC check of the radio network temporary identifier RNTI Identify the value of RNTI;Including following steps:
(3.1) data in current search space are obtained, and carry out solution rate-matched and decoding processing;
(3.2) value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI is carried out at circulation Reason, and radio network temporary identifier RNTI descrambling and CRC check are carried out to decoding treated data;
(3.3) if CRC check is correct, the value and Downlink Control Information DCI letter of radio network temporary identifier RNTI are exported Breath, and terminate to recycle the value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI;
(3.4) if CRC check mistake, continue step (3.2).
2. Physical Downlink Control Channel blind checking method according to claim 1, which is characterized in that the step (2.1.2) is specially:
When the number of the effective CCE is more than or equal to 8, the search space is [8 42 1];
When the number of the effective CCE is more than or equal to 4 and when less than 8, the search space is [4 2 1];
When the number of the effective CCE is more than or equal to 2 and when less than 4, the search space is [2 1];
When the number of the effective CCE is less than 2, the search space is [1].
CN201510926625.5A 2015-12-14 2015-12-14 Physical Downlink Control Channel blind checking method CN105490779B (en)

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