CN107623948B - CCE candidate position selection method and device under PDCCH aggregation level - Google Patents

CCE candidate position selection method and device under PDCCH aggregation level Download PDF

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CN107623948B
CN107623948B CN201610562149.8A CN201610562149A CN107623948B CN 107623948 B CN107623948 B CN 107623948B CN 201610562149 A CN201610562149 A CN 201610562149A CN 107623948 B CN107623948 B CN 107623948B
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朱雅琼
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Potevio Information Technology Co Ltd
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Abstract

The invention provides a method and a device for selecting CCE candidate positions under a PDCCH aggregation level, wherein the method comprises the following steps: calculating the total number of CCE (control channel element) of each downlink subframe under the current subframe ratio; traversing all C _ RNTI values, and acquiring the first CCE positions authorized by all available PDCCHs in all downlink subframes under the set subframe ratio according to the CCE total number of all downlink subframes under the current subframe configuration; and screening out the C-RNTI meeting the conditions according to a set principle, and determining the range of CCE candidate positions meeting the limitation under different aggregation levels. According to the method and the device, the limitation of the range of the CCE candidate positions with different aggregation levels is met, and the CCE possibly occupied by the public information is avoided, so that the conflict probability of the CCE candidate positions is reduced, and the resource utilization rate of the system is improved.

Description

CCE candidate position selection method and device under PDCCH aggregation level
Technical Field
The present invention relates to the field of mobile communication technologies, and in particular, to a method and an apparatus for selecting CCE candidate locations in a PDCCH aggregation level.
Background
In an L TE wireless mobile communication system, a Physical Downlink Control Channel (PDCCH) is used to carry Downlink Control Information (DCI), and is shared by uplink and Downlink scheduling, where the DCI Information mainly includes scheduling assignment Information and other Control Information.
The available Orthogonal Frequency Division Multiplexing (OFDM) symbol number of the PDCCH is indicated by a Physical Control Format Indicator Channel (PCFICH), information carried by the PCFICH is a Control Format Indicator (CFI), and the value range of the CFI is 1-3, that is, the CFI is 1,2 or 3; CFI is represented by two bits and CFI 4 is reserved unused.
For downlink system bandwidth
Figure BDA0001051003310000011
The number of OFDM symbols occupied by the control region is 1(CFI ═ 1), 2(CFI ═ 2), or 3(CFI ═ 3), i.e., equal to CFI. For downlink system bandwidth
Figure BDA0001051003310000012
The number of OFDM symbols occupied by the control region is 2(CFI ═ 1), 3(CFI ═ 2), or 4(CFI ═ 3), i.e., equal to CFI + 1.
Wherein, 4 Resource Elements (REs) of the control channel constitute 1 resource element group REG, and 9 REGs constitute one Control Channel Element (CCE). Once the OFDM symbol number of the PDCCH is determined, the reference signals and REs occupied by the PHICH are removed, and the available CCE number of the current cell can be calculated.
Multiple PDCCHs can be transmitted simultaneously in one subframe, one PDCCH consists of N continuous CCEs, the initial CCE index i must satisfy that i modn is 0 and the range of i is 0-NCCE，k-1, wherein NCCE，kThe number of CCEs used for PDCCH in subframe k. That is, in a PDCCH having n CCEs, the CCE number of the starting position must be an integer multiple of n.
There are 4 types (formats) of PDCCH, which are {0, 1,2, 3} respectively, and correspond to Aggregation L evel {1,2,4,8 }. the Aggregation level indicates the number of consecutive CCEs occupied by one PDCCH, i.e., the aforementioned format of n.pdcch is shown in table 1 below.
TABLE 1 PDCCH Format Table
PDCCH type Number of CCEs Number of REGs Number of PDCCH bits
0 1 9 72
1 2 18 144
2 4 36 288
3 8 72 576
During scheduling, a base station (eNodeB, eNB) selects an available PDCCH resource from a PDCCH search space (SearchSpace) for each UE to be scheduled, and schedules the UE if the available PDCCH resource can be allocated, or does not schedule the UE otherwise.
The UE monitors a PDCCH candidate set (candidates set) defined as a Search Space (Search Space) of the UE in the non-DRX subframe, and decodes according to the monitored DCI format.
Search space at convergence level L∈ {1,2,4,8}
Figure BDA0001051003310000031
Defined as PDCCH candidate set (candidates).
Search Space Search
Figure BDA0001051003310000032
CCEs for PDCCH candidate m in the middle part are calculated by the following formula:
Figure BDA0001051003310000033
wherein i is 0, …, L-1 and M is 0, …, M(L)-1。M(L)The PDCCH candidate number of Search Space is obtained from table 2 of L
TABLE 2
Figure BDA0001051003310000034
Wherein the Search Space (Search Space) is divided into a common Space (common Space) for transmitting control information related to Paging (Paging), random access Response (RA Response), Broadcast Control Channel (BCCH), etc., and a UE-specific Space (UE-specific Space) for transmitting control information related to downlink shared channel (D L-SCH), uplink shared channel (U L-SCH), etc., the common Space starts from CCE 0, and the starting position of the UE-specific Space may be calculated by the function given above (i ═ 0).
For common spaces, YkIs 0; for UE specific space
Figure BDA0001051003310000041
(convergence level L), YkIs defined as Yk＝(A·Yk-1)modD。
Wherein Y is-1＝nRNTINot equal to 0, a 39827, D65537 and
Figure BDA0001051003310000042
nsis the slot number (value 0-19) in one frame.
When the cell bandwidth is small and the number of OFDM symbols allocated to the PDCCH is small, the number of available CCEs is small, for example, when the number of available CCEs is greater than 11 and smaller than 16, the user-specific search space and the common search space overlap each other.
In each scheduling subframe, the priority of the common information is higher than the priority of other users. Thus, the common information may preferentially use CCEs, and the aggregation levels of the common search space are 4 and 8, which are generally allocated from CCE number 0. Once the common information is distributed, when scheduling is performed by a user, because the number of the CCEs is small and the space is limited, CCE candidate position conflicts easily occur, and the scheduling cannot be performed. For the above analysis, the positions of CCEs are randomly distributed in the whole available CCE based on the randomization factor in the formula, and planning avoidance cannot be performed when CCE allocation is performed.
Disclosure of Invention
The present invention provides a CCE candidate location selection method at a PDCCH aggregation level that overcomes or at least partially solves the above mentioned problems.
According to an aspect of the present invention, there is provided a CCE candidate location selection method at a PDCCH aggregation level, comprising: step 1, calculating the total number of CCE (control channel element) of each downlink subframe under the current subframe ratio; step 2, performing traversal calculation on all C _ RNTI values, and acquiring first CCE positions authorized by all available PDCCHs in all downlink subframes under the set subframe ratio according to the CCE total number of all downlink subframes under the current subframe configuration; and 4, screening out the C-RNTI meeting the conditions according to a set principle, and determining the range of CCE candidate positions meeting the limitation under different aggregation levels.
Wherein, before step 4, the method also comprises step 3: and for each downlink subframe, determining that the total number of the available CCEs corresponding to the current subframe is more than 11 and less than 16.
Wherein, step 1 further comprises:
and respectively calculating the CCE number used for the PDCCH of each downlink subframe according to the current subframe ratio and the CFI configuration.
In step 1, control resources for transmitting the PCFICH and the PHICH are removed from a given control channel OFDM symbol.
According to another aspect of the present application, there is provided an apparatus for selecting CCE candidate locations in a PDCCH aggregation level, the apparatus comprising: a CCE total number confirmation module used for calculating the total number of CCE of each downlink subframe under the current subframe ratio; a CCE first position acquisition module used for performing traversal calculation on all C _ RNTI values and acquiring the first CCE positions authorized by all available PDCCHs in each downlink subframe under the set subframe ratio according to the CCE total number of each downlink subframe under the current subframe configuration; and the CCE candidate position selection module is used for screening out the C-RNTI meeting the conditions according to a set principle and determining the range of CCE candidate positions meeting the limitation under different aggregation levels.
The device further comprises a CCE total screening module used for determining that the total number of the available CCEs corresponding to the current subframe is more than 11 and less than 16 for each downlink subframe. And the CCE total number confirmation module is further used for respectively calculating the CCE number used for the PDCCH of each downlink subframe according to the current subframe ratio and the CFI configuration.
According to the technical scheme, when the number of available CCEs is small, the cell radio network temporary identifier (C _ RNTI) is screened in advance to meet the requirement of limiting the range of CCE candidate positions with different aggregation levels and avoid the CCEs possibly occupied by public information, so that the conflict probability of the CCE candidate positions is reduced, and the resource utilization rate of the system is improved. In particular, when the number of available CCEs is greater than 11 and less than 16, the effect on the resource utilization rate of the system is more excellent.
Meanwhile, when the number of CCEs is large, the range of CCE candidate positions with different aggregation levels can be limited by screening the cell radio network temporary identifier (C _ RNTI) in advance, and the CCEs possibly occupied by the public information can be avoided, so that the conflict probability of the CCE candidate positions is reduced, and the resource utilization rate of the system is improved.
Drawings
Fig. 1 is a flowchart illustrating a CCE candidate location selection method in a PDCCH aggregation level according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In summary, one embodiment of the present invention provides a CCE candidate location selection method at a PDCCH aggregation level, the method comprising: step 1, calculating the total number of CCE (control channel element) of each downlink subframe under the current subframe ratio; step 2, performing traversal calculation on all C _ RNTI values, and acquiring first CCE positions authorized by all available PDCCHs in each downlink subframe under the set subframe ratio; and 4, screening out the C-RNTI meeting the conditions according to a set principle, and determining the range of CCE candidate positions meeting the limitation under different aggregation levels. Preferably, step 3 is further included before step 4, and for each downlink subframe, it is determined that the total number of available CCEs corresponding to the current subframe is greater than 11 and less than 16.
The method provided by the invention preferably screens the C _ RNTI in advance when the number of the available CCEs is more than 11 and less than 16 so as to meet the requirement of limiting the range of CCE candidate positions with different aggregation levels and avoid the CCEs possibly occupied by the public information.
Specifically, each step is described in detail, wherein in step 1, the total number of CCEs in each downlink subframe under the current subframe ratio is calculated.
Wherein, the concept of the time-frequency unit RE with the minimum control channel is the same as the service channel, 4 REs form a control channel unit REG, and 9 REGs form a PDCCH CCE.
The PDCCH occupies the first OFDM symbols of each downlink subframe slot 0, and the specific number is given by the CFI configuration carried in the PCFICH. The number of REGs NREG _ RB supportable by each RB after subtracting the reference signal from each symbol is shown in table 3 below, where the number of REGs is different due to the difference of port numbers because the reference signal is related to the number of ports.
TABLE 3 number of REGs supportable per RB NREG _ RB
Figure BDA0001051003310000071
Step 1 further comprises: and respectively calculating the number of CCEs used for the PDCCH of each downlink subframe according to the current subframe ratio and the CFI configuration, wherein for a given control channel OFDM symbol, control resources used for transmitting the PCFICH and the PHICH need to be removed. Therefore, the total number of CCEs of the downlink subframe is calculated as:
Figure BDA0001051003310000072
wherein the content of the first and second substances,
NPCFICHfixed occupation of 4 REGs, NPHICHThe number of occupied REGs is calculated by the following formula:
Figure BDA0001051003310000081
wherein, PHICH resource parameter NgFor inputting configuration values, miThe sub-frame ratio and the sub-frame number are obtained by the following table 4.
Table 4 factor m for frame structure type 2i.
Figure BDA0001051003310000082
In step 2, all C _ RNTI values specified in the L TE protocol are calculated in a traversal manner, and first CCE positions authorized by all available PDCCHs in each downlink subframe under the set subframe ratio are calculated.
Specifically, all C-RNTI values (see Table 5 below, where the range 61:65532 of C-RNTI is obtained) specified in the protocol are calculated in a traversing manner, and the first CCE positions of all available PDCCH grants in each downlink subframe under the set subframe ratio are calculated.
TABLE 5 RNTI values (36.321 TABLE 7.1-1)
Figure BDA0001051003310000091
Wherein, for subframe k, the PDCCH CCE starting position is determined by the following formula (see L TE specification 36.2139.1.1 for details):
Figure BDA0001051003310000092
wherein, the available range of the CCE aggregation level L is L∈ {2,4,8}, wherein, the protocol defines L∈ {1,2,4,8}, L ═ 1 of the present application may be reserved for no use, or all use.
Wherein, Yk＝(A·Yk-1)modD，Y-1C-RNTI ≠ 0, a 39827, and D65537. The value is obtained by iterative calculation, and Y of 0-9 sub-frames of the C-RNTI can be calculated in advancek。NCCE，kThe total number of CCEs of the downlink subframe k currently configured.
Wherein M is 0, …, M(L)-1。M(L)Is the number of available candidate locations for a given search space, which may be found by looking up table 6 below according to aggregation level L.
From table 6, it can be seen that L ═ 1,2,4, and 8 can be used for each C-RNTI, so that there are 6+6+2+2 ═ 16 candidate position starting positions for each downlink subframe.
TABLE 6 PDCCH candidate set monitored by user (36.213 TABLE 9.1.1-1)
Figure BDA0001051003310000093
In step 3, for each downlink subframe, judging whether the total number of available CCEs corresponding to the current subframe is greater than 11 and less than 16, and if the total number of available CCEs corresponding to the current subframe meets the condition, turning to step 4; otherwise, the screening is not needed, and the process is finished.
In step 4, screening out the C-RNTI meeting the conditions according to the following principle.
In order to ensure that when the first 4 or 8 CCEs occupying the common search space are broadcasted in the downlink subframe, the user also has available CCE positions for authorization. In the most severe case, the common message occupies the first 8 CCEs, requiring that candidate locations of different aggregation levels partially avoid these occupied CCEs. For smaller available numbers of available CCEs, the rule is as follows:
rule 1, for a CCE aggregation level of 8, there are only 2 candidate locations. However, only one available candidate position CCE number 0-7 may be occupied, so that no limitation is required in screening.
Rule 2, for a CCE aggregation level of 4, there are only 2 candidate locations. At least one of the two available positions is required to be within the range of CCE numbers 8-15, so that the user can be ensured to have available CCE positions for authorization when the first eight CCEs occupying the common search space are broadcasted in the downlink subframe.
Rule 3, for a CCE aggregation level of 2, there are only 6 candidate locations. These 6 available positions must fall partly within the range of CCE numbers 8-15. Therefore, no limitation is required in screening.
Rule 4, for a CCE aggregation level of 1, there are only 6 candidate locations. It is required that at least one of the 6 available positions falls within the range of CCE numbers 8-15.
For larger number of available CCEs, the above rule can be adjusted as:
rule 5, for CCE aggregation levels of 8, 4, specifies that at least one of the two available locations does not fall within the range of CCE numbers 0-15;
rule 6, for CCE aggregation levels of 2, 1, specifies that at least one of the six available locations does not fall within the range of CCE numbers 0-15.
Generally, the number of CCEs is generally 16 as many division lines.
In another embodiment of the present invention, an apparatus for selecting CCE candidate locations in a PDCCH aggregation level is provided, including: a CCE total number confirmation module used for calculating the total number of CCE of each downlink subframe under the current subframe ratio; a CCE first position acquisition module used for performing traversal calculation on all C _ RNTI values and acquiring first CCE positions authorized by all available PDCCHs in each downlink subframe under the set subframe ratio; and the CCE candidate position selection module is used for screening out the C-RNTI meeting the conditions according to a set principle and determining the range of CCE candidate positions meeting the limitation under different aggregation levels. Preferably, the apparatus further includes a CCE total screening module, configured to determine, for each downlink subframe, that the total number of available CCEs corresponding to the current subframe is greater than 11 and less than 16.
For a specific implementation manner of the apparatus, reference may be made to a specific method of the above-mentioned methods, which is not described herein again.

Claims (3)

1. A method for selecting CCE candidate positions under a PDCCH aggregation level is characterized by comprising the following steps:
step 1, calculating the total number of CCE (control channel element) of each downlink subframe under the current subframe ratio;
step 2, performing traversal calculation on all C _ RNTI values, and acquiring first CCE positions authorized by all available PDCCHs in all downlink subframes under the set subframe ratio according to the CCE total number of all downlink subframes under the current subframe configuration;
step 4, screening out C-RNTIs meeting the conditions according to a set principle, and determining the range of CCE candidate positions meeting the limitation under different aggregation levels;
the total number of CCEs of each downlink subframe under the current subframe ratio is calculated, and the CCE number used for the PDCCH of each downlink subframe is calculated according to the current subframe ratio and the CFI configuration, wherein for a given control channel OFDM symbol, control resources used for transmitting PCFICH and PHICH need to be removed, and then the total number of CCEs of the downlink subframe is calculated as follows:
Figure FDA0002482032900000011
wherein the content of the first and second substances,
NPCFICHfixed occupation of 4 REGs, NPHICHThe number of occupied REGs is calculated by the following formula:
Figure FDA0002482032900000012
wherein, PHICH resource parameter NgFor inputting configuration values, miObtaining the sub-frame ratio and the sub-frame number through table look-up;
the setting rule comprises the following steps:
for a CCE aggregation level of 8, no limitation is imposed during screening;
for a CCE aggregation level of 4, it is specified that at least one of the two available locations falls within the range of CCE numbers 8-15;
for CCE aggregation level of 2, no limitation is imposed during screening;
for a CCE aggregation level of 1, it is specified that at least one of the six available locations falls within the range of CCE numbers 8-15;
for CCE aggregation levels of 8, 4, it is specified that at least one of the two available locations does not fall within the range of CCE numbers 0-15;
for CCE aggregation levels of 2, 1, it is specified that at least one of the six available locations does not fall within the range of CCE numbers 0-15;
step 3, before step 4, judging whether the total number of the available CCE corresponding to the current subframe is more than 11 and less than 16 or not for each downlink subframe, and if the total number of the available CCE corresponding to the current subframe is more than 11 and less than 16, turning to step 4; otherwise, the screening is not needed, and the process is finished.
2. The method according to claim 1, wherein, in step 2,
for downlink subframe k, determining the CCE starting position of the PDCCH by the following formula:
Figure FDA0002482032900000021
wherein the available range of the CCE aggregation level L is L∈ {2,4,8}, Yk＝(A·Yk-1)mod D，Y-1＝C-RNTI≠0,A＝39827,D＝65537，NCCE，kThe CCE total number of the downlink subframe k configured currently; m is 0, …, M(L)-1，M(L)Is the number of available candidate locations for a given search space.
3. An apparatus for selecting CCE candidate positions under a PDCCH aggregation level, comprising:
a CCE total number confirmation module used for calculating the total number of CCE of each downlink subframe under the current subframe ratio;
a CCE first position acquisition module used for performing traversal calculation on all C _ RNTI values and acquiring the first CCE positions authorized by all available PDCCHs in each downlink subframe under the set subframe ratio according to the CCE total number of each downlink subframe under the current subframe configuration;
the CCE candidate position selection module is used for screening out the C-RNTI meeting the conditions according to a set principle and determining the range of CCE candidate positions meeting the limitation under different aggregation levels;
the total number of CCEs of each downlink subframe under the current subframe ratio is calculated, and the CCE number used for the PDCCH of each downlink subframe is calculated according to the current subframe ratio and the CFI configuration, wherein for a given control channel OFDM symbol, control resources used for transmitting PCFICH and PHICH need to be removed, and then the total number of CCEs of the downlink subframe is calculated as follows:
Figure FDA0002482032900000031
wherein the content of the first and second substances,
NPCFICHfixed occupation of 4 REGs, NPHICHThe number of occupied REGs is calculated by the following formula:
Figure FDA0002482032900000032
wherein, PHICH resource parameter NgFor inputting configuration values, miObtaining the sub-frame ratio and the sub-frame number through table look-up;
the setting rule comprises the following steps:
for a CCE aggregation level of 8, no limitation is imposed during screening;
for a CCE aggregation level of 4, it is specified that at least one of the two available locations falls within the range of CCE numbers 8-15;
for CCE aggregation level of 2, no limitation is imposed during screening;
for a CCE aggregation level of 1, it is specified that at least one of the six available locations falls within the range of CCE numbers 8-15;
for CCE aggregation levels of 8, 4, it is specified that at least one of the two available locations does not fall within the range of CCE numbers 0-15;
for CCE aggregation levels of 2, 1, it is specified that at least one of the six available locations does not fall within the range of CCE numbers 0-15;
the system also comprises a CCE total screening module used for judging whether the total number of the available CCE corresponding to the current subframe is more than 11 and less than 16 or not for each downlink subframe, if so, screening the C-RNTI meeting the conditions according to a set principle, and determining the range of CCE candidate positions meeting the restriction under different aggregation levels; otherwise, the screening is not needed, and the process is finished.
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