CN109041243B - Sending method and receiving method of physical downlink control channel and related equipment - Google Patents
Sending method and receiving method of physical downlink control channel and related equipment Download PDFInfo
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Abstract
The invention provides a sending method and a receiving method of a physical downlink control channel and related equipment. The sending method comprises the following steps: determining the aggregation level of the physical downlink control channel; selecting a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces with exclusive resources exist in all physical downlink control channel candidate spaces included in any two search space patterns; and transmitting the physical downlink control channel by utilizing the search space corresponding to the target pattern. The sending method of the physical downlink control channel can increase the number of user equipment which can be scheduled by the physical downlink control channel and improve the utilization rate of resources of the physical downlink control channel.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a sending method and a receiving method for a physical downlink control channel, and a related device.
Background
The PDCCH (Physical Downlink Shared Channel) may be used to indicate the PDSCH (Physical Downlink Shared Channel) scheduling corresponding to the UE (User Equipment), or the time-frequency resource and transmission parameter of the PUSCH (Physical Uplink Shared Channel) scheduling to be transmitted, but to obtain the information, the UE needs to detect the PDCCH first.
LTE (Long Term Evolution) adopts a blind detection method to allow UE to acquire its PDCCH, but the control region occupies the entire bandwidth in the Frequency domain, and occupies the first 3 or 4 OFDM (Orthogonal Frequency Division Multiplexing) symbols in the time domain, and if complete blind detection is performed, a Long processing time is required.
The search space can effectively reduce the blind detection range, defines some resource positions, and the PDCCH of the UE can only appear on the limited resource positions, so that the blind detection range can be reduced, the improvement of the PDCCH detection efficiency of the UE is facilitated, and the complexity of the blind detection of the UE is reduced. One PDCCH is transmitted on n consecutive CCEs (Control Channel elements), and the PDCCH has 4 formats, which respectively correspond to aggregation levels {1, 2, 4, 8 }. The aggregation level indicates the number of consecutive CCEs occupied by one PDCCH.
In 5G NR (New Radio, New Radio access), PDCCH candidate spaces of different aggregation levels in a search space adopt a hierarchical design, and compared with the hierarchical search space of LTE in which starting positions of PDCCH candidate spaces of different aggregation levels are independent from each other, in the hierarchical search space of 5G NR, CCE positions of PDCCH candidate spaces of lower aggregation levels need to be included in CCE positions of PDCCH candidate spaces of higher aggregation levels, for example, in a structure in which CCEs are continuously distributed, starting positions of candidate spaces of all aggregation levels (1, 2, 4, 8) are the same. Since the CCE locations of the candidate spaces of different aggregation levels overlap each other, the hierarchical search space may reduce the complexity of blind detection of the UE by multiplexing channel estimation of REs (Resource elements), but may also cause the collision probability between different candidate spaces to be greater than that of LTE.
Specifically, in 5G, a hierarchical search space design manner is adopted for the UE-specific search space, and the CCE location with a low aggregation level (relative to the highest aggregation level) is located within the CCE location with the highest aggregation level. If CCEs in PDCCH candidate spaces of different aggregation levels are continuously distributed, the collision probability between the PDCCH candidate spaces is very high. If CCEs in PDCCH candidate spaces with different aggregation levels are distributed discontinuously, the CCE overlapping probability between the PDCCH candidate spaces is reduced, and the collision probability is reduced. However, since the PDCCH candidate space pattern of the UE-specific search space is the same for all UEs having the same search space starting position, the number of CCEs that can be used in the low aggregation level candidate space is limited, the idle CCE position cannot be used for other data transmission, the number of UEs that can be scheduled by the PDCCH is still low, and the resource utilization rate of the PDCCH is low.
Therefore, no matter whether the CCEs are distributed continuously or discontinuously, the number of UEs that can be scheduled by the PDCCH is limited, and the utilization rate of the PDCCH resources is low. Taking the PDCCH candidate space of aggregation level 4 as an example, when the starting position of the candidate space of the highest aggregation level is fixed, the PDCCH can schedule 2 UEs using aggregation level 4 at most, see fig. 1 and fig. 2. In the PDCCH candidate space pattern of such a fixed search space, the CCE locations of the PDCCH candidate spaces with low aggregation levels are fixed with respect to the candidate space location with aggregation level 8, and when the starting locations of the PDCCH candidate spaces with the highest aggregation level in the specific search spaces of different UEs are the same, the PDCCH can only schedule 2 UEs with aggregation level 4 at most, and meanwhile, the free resources of 8 CCEs cannot be used for the PDCCH to schedule other UEs with aggregation level 4.
As can be seen from the above, no effective solution has been proposed at present for the problem of low resource utilization of the physical downlink control channel.
Disclosure of Invention
Embodiments of the present invention provide a sending method, a receiving method, and related devices for a physical downlink control channel, so as to improve a resource utilization rate of the physical downlink control channel.
In order to achieve the above object, an embodiment of the present invention provides a method for sending a physical downlink control channel, where the method is used in a base station, and the method includes:
determining the aggregation level of the physical downlink control channel;
selecting a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces with exclusive resources exist in all physical downlink control channel candidate spaces included in any two search space patterns;
and transmitting the physical downlink control channel by utilizing the search space corresponding to the target pattern.
The embodiment of the invention also provides a receiving method of the physical downlink control channel, which is used for a mobile communication terminal and comprises the following steps:
determining a target pattern selected from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces for monopolizing resources exist in the physical downlink control channel candidate spaces included in any two search space patterns;
and searching the physical downlink control channel in a search space corresponding to the target pattern.
An embodiment of the present invention further provides a base station, where the base station includes:
a processor, configured to determine an aggregation level of a physical downlink control channel;
the processor is further configured to select a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces with exclusive resources exist in all physical downlink control channel candidate spaces included in any two search space patterns;
and the transmitter is used for transmitting the physical downlink control channel by using the search space corresponding to the target pattern.
An embodiment of the present invention further provides a mobile communication terminal, including:
a processor for determining a target pattern selected from at least two search space patterns corresponding to an aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces for monopolizing resources exist in the physical downlink control channel candidate spaces included in any two search space patterns;
the processor is further configured to search the physical downlink control channel in a search space corresponding to the target pattern.
The embodiment of the present invention further provides a base station, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the sending method of the physical downlink control channel when executing the program.
The embodiment of the invention also provides a mobile communication terminal which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein the processor realizes the receiving method of the physical downlink control channel when executing the program.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the above-mentioned sending method for a physical downlink control channel, or implements the above-mentioned receiving method for the physical downlink control channel.
In the embodiment of the invention, the aggregation level of the physical downlink control channel is determined; selecting a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces with exclusive resources exist in all physical downlink control channel candidate spaces included in any two search space patterns; and transmitting the physical downlink control channel by utilizing the search space corresponding to the target pattern. Because each aggregation level corresponds to at least two search space patterns, in all the physical downlink control channel candidate spaces included in any two search space patterns, at least two physical downlink control channel candidate spaces exclusive of resources exist, so that the number of user equipment which can be scheduled by a physical downlink control channel can be increased, and the resource utilization rate of the physical downlink control channel is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic diagram illustrating a search space pattern provided in the related art;
FIG. 2 is a schematic diagram of another search space pattern provided by the related art;
fig. 3 is a flowchart illustrating a method for transmitting a physical downlink control channel according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a search space pattern according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a search space pattern according to another embodiment of the present invention;
FIG. 6 is a diagram illustrating a search space pattern according to another embodiment of the present invention;
FIG. 7 is a diagram illustrating a search space pattern according to another embodiment of the present invention;
FIG. 8 is a diagram illustrating a search space pattern according to another embodiment of the present invention;
FIG. 9 is a diagram illustrating a search space pattern according to another embodiment of the present invention;
FIG. 10 is a diagram illustrating a search space pattern according to another embodiment of the present invention;
FIG. 11 is a diagram illustrating a search space pattern with an aggregation level of 4 according to an embodiment of the present invention;
fig. 12 is a schematic diagram illustrating user equipment scheduling with aggregation level 4 according to an embodiment of the present invention;
fig. 13 is a schematic diagram illustrating search space patterns when UE search space start positions are different according to an embodiment of the present invention;
fig. 14 is a flowchart illustrating a method for receiving a physical downlink control channel according to an embodiment of the present invention;
fig. 15 is a schematic diagram of a base station according to an embodiment of the present invention;
fig. 16 is a diagram illustrating a mobile communication terminal according to an embodiment of the present invention;
fig. 17 is a schematic diagram of a base station according to another embodiment of the present invention;
fig. 18 is a diagram illustrating a mobile communication terminal according to still another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a method for sending a physical downlink control channel, which is used for a base station. By respectively setting a plurality of search space patterns for each aggregation level, at least two physical downlink control channel candidate spaces which monopolize resources exist in all physical downlink control channel candidate spaces included in any two search space patterns, so that the number of user equipment which can be scheduled by a physical downlink control channel is increased, and the utilization rate of resources of the physical downlink control channel is improved.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for transmitting a physical downlink control channel according to an embodiment of the present invention, and as shown in fig. 3, the method includes the following steps:
In this embodiment, the aggregation level indicates the number of consecutive CCEs (Control Channel elements) occupied by one PDCCH (Physical Downlink Shared Channel). Specifically, the PDCCH may have multiple formats, for example, four formats, which correspond to aggregation levels {1, 2, 4, 8 }.
Specifically, an eNodeB (Evolved Node B) may determine an aggregation level of a certain PDCCH according to factors such as channel quality, for example, if the PDCCH is sent to a UE (User equipment) with good downlink channel quality, 1 CCE may be used to send the PDCCH, that is, it is determined that the PDCCH corresponds to aggregation level 1; if a PDCCH is intended for a UE with poor downlink channel quality, 8 CCEs may be required to be used to transmit the PDCCH to achieve sufficient robustness, i.e., it is determined that the PDCCH corresponds to aggregation level 8.
In this embodiment, the search spaces may be respectively aggregated levels. For example, taking the aggregation level including 1, 2, 4, and 8 as an example, at least one of the aggregation level 1, the aggregation level 2, and the aggregation level 4 sets a plurality of different search space patterns. Specifically, each aggregation level may correspond to at least two search space patterns, and in all the candidate spaces of the physical downlink control channel included in any two search space patterns, at least two candidate spaces of the physical downlink control channel exclusive of resources exist.
It should be noted that, in this embodiment, the number of the physical downlink control channel Candidate spaces (i.e., PDCCH candidates) included in each search space pattern and the size and the position of the included physical downlink control channel Candidate spaces are not limited. In addition, in this embodiment, the first resource set corresponding to each search space pattern corresponding to the aggregation level is a subset of the second resource set of the search space corresponding to the aggregation level with the maximum value, where the search space corresponding to the aggregation level with the maximum value may be one search space or a union of multiple search spaces.
And 303, sending the physical downlink control channel by using the search space corresponding to the target pattern.
In this embodiment, different search space patterns may be configured for different PDCCHs, and the PDCCHs may be transmitted through search spaces corresponding to the different search space patterns, so as to improve the utilization rate of PDCCH resources.
The present embodiment is described below with reference to fig. 4 to 10:
referring to fig. 4, a certain aggregation level corresponds to 3 search space patterns, that is, a search space pattern #1, a search space pattern #2, and a search space pattern #3, resource sets corresponding to the space pattern #1, the search space pattern #2, and the search space pattern #3 are all subsets of resource sets of a search space corresponding to the aggregation level with the largest value, the search space pattern #1, the search space pattern #2, and the search space pattern #3 all include a PDCCH candidate space, PDCCH candidate spaces of the search space pattern #1, the search space pattern #2, and the search space pattern #3 are all non-overlapping, that is, PDCCH candidate spaces all of which are exclusive resources, so that 3 UEs using the aggregation level can be scheduled in the search space.
Referring to fig. 5, a certain aggregation level corresponds to 2 search space patterns, that is, a search space pattern #1 and a search space pattern #2, the search space pattern #1 and the search space pattern #2 both include two PDCCH candidate spaces, and the candidate spaces of the search space pattern #1 and the search space pattern #2 are also not overlapped, that is, are all PDCCH candidate spaces with exclusive resources, so that 4 UEs using the aggregation level can be scheduled in the search space.
Referring to fig. 6, a certain aggregation level corresponds to 2 search space patterns, namely, a search space pattern #1 and a search space pattern #2, and each of the search space pattern #1 and the search space pattern #2 includes two PDCCH candidate spaces, but compared to fig. 5, there is one overlapped PDCCH candidate space in the search space pattern #1 and the search space pattern #2 in fig. 6, so that only 3 UEs using the aggregation level can be scheduled in the search space at most.
Referring to fig. 7, a certain aggregation level corresponds to 2 search space patterns, that is, a search space pattern #1 and a search space pattern #2, each of the search space pattern #1 and the search space pattern #2 includes two PDCCH candidate spaces, and as shown in fig. 6, there is an overlapping PDCCH candidate space in the search space pattern #1 and the search space pattern #2 in fig. 7, so that at most 3 UEs using the aggregation level can be scheduled in the search space.
Referring to fig. 8, a certain aggregation level corresponds to 3 search space patterns, that is, search space pattern #1, search space pattern #2, and search space pattern #3, and each of search space pattern #1, search space pattern #2, and search space pattern #3 includes two PDCCH candidate spaces, where there is one overlapping PDCCH candidate space in search space pattern #1 and search space pattern #3, and search space pattern #2 and search space pattern #3, respectively, so that at most 4 UEs using the aggregation level can be scheduled in the search space.
Referring to fig. 9, a certain aggregation level corresponds to 2 search space patterns, that is, a search space pattern #1 and a search space pattern #2, the search space pattern #1 and the search space pattern #2 both include 3 PDCCH candidate spaces, and the candidate spaces of the search space pattern #1 and the search space pattern #2 are also not overlapped, that is, are all PDCCH candidate spaces with exclusive resources, so that 6 UEs using the aggregation level can be scheduled in the search space.
Referring to fig. 10, a certain aggregation level corresponds to 3 search space patterns, namely, a search space pattern #1, a search space pattern #2, and a search space pattern #3, each of the search space pattern #1, the search space pattern #2, and the search space pattern #3 includes 3 PDCCH candidate spaces, and there is an overlapping PDCCH candidate space in the search space pattern #1 and the search space pattern #2, so that only 5 UEs using the aggregation level can be scheduled in the search space at most.
As can be seen from the above, in the present embodiment, the CCE locations covered by different search space patterns are different, so that the collision probability between PDCCH candidate spaces can be reduced. In addition, compared with fig. 1 and fig. 2, different search space patterns in this embodiment can cover more CCE locations, so that more UEs can be scheduled, and the utilization rate of PDCCH resources is improved.
The sending method of the physical downlink control channel provided by the embodiment of the invention determines the aggregation level of the physical downlink control channel; selecting a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces with exclusive resources exist in all physical downlink control channel candidate spaces included in any two search space patterns; and transmitting the physical downlink control channel by utilizing the search space corresponding to the target pattern. Because each aggregation level corresponds to at least two search space patterns, in all the physical downlink control channel candidate spaces included in any two search space patterns, at least two physical downlink control channel candidate spaces exclusive of resources exist, so that the number of user equipment which can be scheduled by a physical downlink control channel can be increased, and the resource utilization rate of the physical downlink control channel is improved.
Optionally, all the candidate spaces of the physical downlink control channel included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.
In this embodiment, in order to fully utilize PDCCH resources, all physical downlink control channel candidate spaces included in at least two search space patterns corresponding to an aggregation level are exclusive of resources. For example, referring to fig. 5, a certain aggregation level corresponds to search space pattern #1 and search space pattern #2, where 4 PDCCH candidate spaces included in search space pattern #1 and search space pattern #2 both have exclusive resources, so that 4 UEs using the aggregation level can be scheduled in the search space, and the utilization rate of PDCCH resources can be further improved compared to the search space pattern shown in fig. 6.
Optionally, the sending method of the physical downlink control channel further includes: and sending indication information for indicating the target pattern.
In this embodiment, the base station may reduce the complexity of blind detection of the UE by sending indication information for indicating the target pattern. For example, referring to fig. 9, assuming that the target pattern is a search space pattern #1, if indication information indicating the target pattern is not sent, blind detection needs to be performed on 6 PDCCH candidate spaces included in the search space pattern #1 and the search space pattern #2, and if the indication information indicating the target pattern is sent, the UE may only detect the PDCCH candidate spaces included in the target pattern, that is, only needs to perform blind detection on 3 PDCCH candidate spaces included in the search space pattern #1, which may effectively reduce the complexity of blind detection, reduce the time required for blind detection, and improve the blind detection efficiency.
Optionally, the indication information is carried by a radio resource control signaling or downlink control information.
In this embodiment, the base station may send the indication Information to the UE through an RRC (Radio Resource Control) signaling or a DCI (Downlink Control Information) carrying the indication Information.
Specifically, the base station indication period may be a semi-static indication or a dynamic indication, where the semi-static indication of the base station may be indicated by a higher layer signaling, for example, a Radio Resource Control (RRC) signaling; the dynamic indication of the base station may be carried through DCI (Downlink Control Information) in the PDCCH. For example, after the UE decodes the search space pattern selection sequence number indicated in the DCI when receiving the PDCCH in a certain time slot, the UE may select the indicated search space pattern when blindly detecting the PDCCH in the next time slot.
Optionally, in the step of selecting a target pattern from the at least two search space patterns corresponding to the aggregation level, the target pattern is determined according to at least one of the RNTI and the system frame number.
In this embodiment, the target pattern may be determined according to parameters of the UE, for example, RNTI (Radio Network temporary Identity), system frame number, and the like.
For example, the search space pattern may be selected by using a hash function of RNTI, and specifically, the search space pattern may be selected by using the following formula:
wherein,
using the sequence number of the search space pattern with aggregation level L, i is the current subframe number, DLThe number of search space patterns with aggregation level L.
The following describes an embodiment of the present invention with reference to specific examples, where the maximum aggregation level is aggregation level 8:
taking an aggregation level of 4 as an example, in a search space of 16 CCEs, the aggregation level may correspond to 6 different search space patterns, for example, as shown in fig. 11, a search space pattern #1, a search space pattern #2, a search space pattern #3, a search space pattern # 4, a search space pattern #5, and a search space pattern # 6. Referring to the search space pattern with aggregation level 4, the PDCCH may schedule 4 UEs using aggregation level 4 at most, for example, as shown in fig. 12, UE #1, UE #2, UE #3, and UE # 4, which improves resource utilization of the PDCCH. Meanwhile, for each UE, the number of PDCCH candidate spaces with the aggregation level of 4 is still 2, and the PDCCH blind detection complexity is not increased.
In the above, considering that the starting positions of the search spaces of different UEs are the same, a greater number of UEs can be scheduled through the search space pattern, and meanwhile, the collision probability between PDCCH candidate spaces is reduced. When the initial positions of the search spaces of the UEs are different, the maximum number of UEs can be scheduled in the limited PDCCH resources by using the embodiment of the present invention. As shown in fig. 13, the starting positions of the search space #1 and the search space #2 are different by 8 CCEs, and by configuring different UEs into different search space patterns, a maximum of 6 UEs using aggregation level 4 can be scheduled within 24 CCE resources.
As can be seen from the above, in the present embodiment, different search space patterns are designed for low aggregation levels (aggregation levels relative to the maximum value) of the UE-specific search space, that is, the CCE position of the low aggregation level PDCCH candidate space is not fixed relative to the CCE position of the maximum aggregation level PDCCH candidate space. The search space patterns have partial CCE overlapping, different UEs can be configured into different search space patterns, and blind detection is performed in the respective search space patterns correspondingly. Since the CCE positions covered by different search space patterns are different, the collision probability among PDCCH candidate spaces can be reduced.
The embodiment of the invention also provides a receiving method of the physical downlink control channel, which is used for the mobile communication terminal. Fig. 14 is a flowchart illustrating a method for receiving a physical downlink control channel according to an embodiment of the present invention, where as shown in fig. 14, the method for receiving a physical downlink control channel includes the following steps:
1401, determining a target pattern selected from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of the second resource set of the search space corresponding to the aggregation level with the maximum value, and at least two physical downlink control channel candidate spaces with exclusive resources exist in the physical downlink control channel candidate spaces included in any two search space patterns.
In this embodiment, a plurality of different search space patterns may be set for each aggregation level of the search space, for example, at least one of the aggregation level 1, the aggregation level 2, and the aggregation level 4. Specifically, each aggregation level may correspond to at least two search space patterns, and in all the candidate spaces of the physical downlink control channel included in any two search space patterns, at least two candidate spaces of the physical downlink control channel exclusive of resources exist.
It should be noted that, in this embodiment, the number of the physical downlink control channel candidate spaces included in each search space pattern and the size and the position of the included physical downlink control channel candidate spaces are not limited. In addition, in this embodiment, the first resource set corresponding to each search space pattern corresponding to the aggregation level is a subset of the second resource set of the search space corresponding to the aggregation level with the maximum value, where the search space corresponding to the aggregation level with the maximum value may be one search space or a union of multiple search spaces.
Specifically, the base station may select one search space pattern as a target pattern from at least two search space patterns corresponding to the aggregation level of the PDCCH, so as to transmit the PDCCH through a search space corresponding to the target pattern. Accordingly, the mobile communication terminal may determine the target pattern first to search the PDCCH from the search space corresponding to the target pattern.
The embodiment of the invention determines a target pattern selected from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces for monopolizing resources exist in the physical downlink control channel candidate spaces included in any two search space patterns; and searching the physical downlink control channel in a search space corresponding to the target pattern. Because each aggregation level corresponds to at least two search space patterns, in all the physical downlink control channel candidate spaces included in any two search space patterns, at least two physical downlink control channel candidate spaces exclusive of resources exist, so that the number of user equipment which can be scheduled by a physical downlink control channel can be increased, and the resource utilization rate of the physical downlink control channel is improved.
Optionally, all the candidate spaces of the physical downlink control channel included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.
In this embodiment, in order to fully utilize PDCCH resources, all physical downlink control channel candidate spaces included in at least two search space patterns corresponding to an aggregation level are exclusive of resources. For example, referring to fig. 5, a certain aggregation level corresponds to search space pattern #1 and search space pattern #2, where 4 PDCCH candidate spaces included in search space pattern #1 and search space pattern #2 both have exclusive resources, so that 4 UEs using the aggregation level can be scheduled in the search space, and the utilization rate of PDCCH resources can be further improved compared to the search space pattern shown in fig. 6.
Optionally, the receiving method of the physical downlink control channel further includes: receiving indication information for indicating the target pattern; the step of determining a target pattern selected from the at least two search space patterns corresponding to the aggregation level specifically determines the target pattern according to the indication information.
In this embodiment, the mobile communication terminal may reduce the complexity of blind detection of the mobile communication terminal by receiving the indication information for indicating the target pattern to determine the target pattern according to the indication information. For example, referring to fig. 9, assuming that the target pattern is a search space pattern #1, if there is no indication information indicating the target pattern, the mobile communication terminal needs to perform blind detection on 6 PDCCH candidate spaces included in the search space pattern #1 and the search space pattern #2, and if the indication information indicating the target pattern is sent, the UE may only detect the PDCCH candidate spaces included in the target pattern, that is, only need to perform blind detection on 3 PDCCH candidate spaces included in the search space pattern #1, which may effectively reduce the complexity of blind detection, reduce the time required for blind detection, and improve the blind detection efficiency.
Optionally, the indication information is carried by a radio resource control signaling or downlink control information.
In this embodiment, the indication Information may be carried by RRC (Radio Resource Control) signaling or DCI (Downlink Control Information).
Optionally, in the step of determining a target pattern selected from the at least two search space patterns corresponding to the aggregation level, the target pattern is determined according to at least one of an RNTI and a system frame number.
In this embodiment, the target pattern may be determined according to parameters of the UE, for example, RNTI (Radio Network temporary Identity), system frame number, and the like.
For example, the search space pattern may be selected by using a hash function of RNTI, and specifically, the search space pattern may be selected by using the following formula:
wherein,
using the sequence number of the search space pattern with aggregation level L, i is the current subframe number, DLThe number of search space patterns with aggregation level L.
The embodiment of the invention also provides a base station. Fig. 15 is a schematic diagram of a base station according to an embodiment of the present invention, and as shown in fig. 15, the base station 1500 includes a processor 1501 and a transmitter 1502, where:
a processor 1501, configured to determine an aggregation level of the physical downlink control channel;
the processor 1501 is further configured to select a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces with exclusive resources exist in all physical downlink control channel candidate spaces included in any two search space patterns;
a transmitter 1502, configured to transmit the physical downlink control channel using a search space corresponding to the target pattern.
Optionally, all the candidate spaces of the physical downlink control channel included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.
Optionally, the transmitter 1502 is further configured to transmit indication information for indicating the target pattern.
Optionally, the indication information is carried by a radio resource control signaling or downlink control information.
Optionally, the processor 1501 determines the target pattern according to at least one of an RNTI and a system frame number.
In the base station of the embodiment of the present invention, the processor 1501 determines the aggregation level of the physical downlink control channel; selecting a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces with exclusive resources exist in all physical downlink control channel candidate spaces included in any two search space patterns; the transmitter 1502 transmits the physical downlink control channel using the search space corresponding to the target pattern. Because each aggregation level corresponds to at least two search space patterns, in all the physical downlink control channel candidate spaces included in any two search space patterns, at least two physical downlink control channel candidate spaces exclusive of resources exist, so that the number of user equipment which can be scheduled by a physical downlink control channel can be increased, and the resource utilization rate of the physical downlink control channel is improved.
The embodiment of the invention also provides a mobile communication terminal. Fig. 16 is a schematic diagram of a mobile communication terminal according to an embodiment of the present invention, and as shown in fig. 16, the mobile communication terminal 1600 includes a processor 1601 and a receiver 1602, where:
a processor 1601 for determining a target pattern selected from at least two search space patterns corresponding to an aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces for monopolizing resources exist in the physical downlink control channel candidate spaces included in any two search space patterns;
the processor 1601 is further configured to search the physical downlink control channel in a search space corresponding to the target pattern.
Optionally, all the candidate spaces of the physical downlink control channel included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.
Optionally, the mobile communication terminal 1600 further includes: a receiver 1602, configured to receive indication information indicating the target pattern; the processor 1601 specifically determines the target pattern according to the indication information.
Optionally, the indication information is carried by a radio resource control signaling or downlink control information.
Optionally, the processor 1601 determines the target pattern according to at least one of an RNTI and a system frame number.
The mobile communication device of the embodiment of the present invention determines, by the processor 1601, a target pattern selected from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces for monopolizing resources exist in the physical downlink control channel candidate spaces included in any two search space patterns; and searching the physical downlink control channel in a search space corresponding to the target pattern. Because each aggregation level corresponds to at least two search space patterns, in all the physical downlink control channel candidate spaces included in any two search space patterns, at least two physical downlink control channel candidate spaces exclusive of resources exist, so that the number of user equipment which can be scheduled by a physical downlink control channel can be increased, and the resource utilization rate of the physical downlink control channel is improved.
The embodiment of the invention also provides a base station. Fig. 17 is a schematic diagram of a base station according to an embodiment of the present invention, as shown in fig. 17, the base station 1700 includes a memory 1701, a processor 1702 and a computer program 17011 stored in the memory 1701 and executable on the processor 1702, where the processor 1702 executes the computer program 17011 to implement the following steps:
determining the aggregation level of the physical downlink control channel;
selecting a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces with exclusive resources exist in all physical downlink control channel candidate spaces included in any two search space patterns;
and transmitting the physical downlink control channel by utilizing the search space corresponding to the target pattern.
Optionally, all the candidate spaces of the physical downlink control channel included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.
Optionally, the processor 1702 executes the program 17011 to further implement the following steps: and sending indication information for indicating the target pattern.
Optionally, the indication information is carried by a radio resource control signaling or downlink control information.
Optionally, in the step of selecting a target pattern from the at least two search space patterns corresponding to the aggregation level, the target pattern is determined according to at least one of the RNTI and the system frame number.
The base station of the embodiment of the invention determines the aggregation level of the physical downlink control channel; selecting a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces with exclusive resources exist in all physical downlink control channel candidate spaces included in any two search space patterns; and transmitting the physical downlink control channel by utilizing the search space corresponding to the target pattern. Because each aggregation level corresponds to at least two search space patterns, in all the physical downlink control channel candidate spaces included in any two search space patterns, at least two physical downlink control channel candidate spaces exclusive of resources exist, so that the number of user equipment which can be scheduled by a physical downlink control channel can be increased, and the resource utilization rate of the physical downlink control channel is improved.
Referring to fig. 18, an embodiment of the present invention further provides a mobile communication terminal, where the mobile communication terminal 1800 includes a memory 1801, a processor 1802, and a computer program 18011 stored in the memory 1801 and executable on the processor 1802, where the processor 1802 executes the program 18011 to implement the following steps:
determining a target pattern selected from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces for monopolizing resources exist in the physical downlink control channel candidate spaces included in any two search space patterns;
and searching the physical downlink control channel in a search space corresponding to the target pattern.
Optionally, all the candidate spaces of the physical downlink control channel included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.
Optionally, the processor 1802 executing the program 18011 further implements the following steps: receiving indication information for indicating the target pattern; the step of determining a target pattern selected from the at least two search space patterns corresponding to the aggregation level specifically determines the target pattern according to the indication information.
Optionally, the indication information is carried by a radio resource control signaling or downlink control information.
Optionally, in the step of selecting a target pattern from the at least two search space patterns corresponding to the aggregation level, the target pattern is determined according to at least one of the RNTI and the system frame number.
The mobile communication device of the embodiment of the invention determines a target pattern selected from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces for monopolizing resources exist in the physical downlink control channel candidate spaces included in any two search space patterns; and searching the physical downlink control channel in a search space corresponding to the target pattern. Because each aggregation level corresponds to at least two search space patterns, in all the physical downlink control channel candidate spaces included in any two search space patterns, at least two physical downlink control channel candidate spaces exclusive of resources exist, so that the number of user equipment which can be scheduled by a physical downlink control channel can be increased, and the resource utilization rate of the physical downlink control channel is improved.
The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for transmitting a physical downlink control channel according to any of the above method embodiments.
It will be understood by those skilled in the art that all or part of the steps of the method for implementing the above embodiments may be implemented by hardware associated with program instructions, and the program may be stored in a computer readable medium, and when executed, the program includes the following steps:
determining the aggregation level of the physical downlink control channel;
selecting a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces with exclusive resources exist in all physical downlink control channel candidate spaces included in any two search space patterns;
and transmitting the physical downlink control channel by utilizing the search space corresponding to the target pattern.
Optionally, all the candidate spaces of the physical downlink control channel included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.
Optionally, the program further includes the following steps when executed: and sending indication information for indicating the target pattern.
Optionally, the indication information is carried by a radio resource control signaling or downlink control information.
Optionally, in the step of selecting a target pattern from the at least two search space patterns corresponding to the aggregation level, the target pattern is determined according to at least one of the RNTI and the system frame number.
The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for receiving a physical downlink control channel according to any of the above method embodiments.
It will be understood by those skilled in the art that all or part of the steps of the method for implementing the above embodiments may be implemented by hardware associated with program instructions, and the program may be stored in a computer readable medium, and when executed, the program includes the following steps:
determining a target pattern selected from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces for monopolizing resources exist in the physical downlink control channel candidate spaces included in any two search space patterns;
and searching the physical downlink control channel in a search space corresponding to the target pattern.
Optionally, all the candidate spaces of the physical downlink control channel included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.
Optionally, the program further includes the following steps when executed: receiving indication information for indicating the target pattern; the step of determining a target pattern selected from the at least two search space patterns corresponding to the aggregation level specifically determines the target pattern according to the indication information.
Optionally, the indication information is carried by a radio resource control signaling or downlink control information.
Optionally, in the step of selecting a target pattern from the at least two search space patterns corresponding to the aggregation level, the target pattern is determined according to at least one of the RNTI and the system frame number.
The storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (23)
1. A method for transmitting a Physical Downlink Control Channel (PDCCH) is used for a base station, and the method comprises the following steps:
determining the aggregation level of the physical downlink control channel;
selecting a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and in all the physical downlink control channel candidate spaces included in any two search space patterns, at least two physical downlink control channel candidate spaces exclusive of resources exist, wherein the search space corresponding to the aggregation level of the maximum value is one search space or a union of a plurality of search spaces;
and transmitting the physical downlink control channel by utilizing the search space corresponding to the target pattern.
2. The method according to claim 1, wherein all physical downlink control channel candidate spaces included in the at least two search space patterns corresponding to the aggregation level are exclusive resources.
3. The method for transmitting the physical downlink control channel according to claim 1, further comprising:
and sending indication information for indicating the target pattern.
4. The sending method of physical downlink control channel according to claim 3, wherein the indication information is carried by radio resource control signaling or downlink control information.
5. The method according to claim 3, wherein in the step of selecting the target pattern from the at least two search space patterns corresponding to the aggregation level, the target pattern is determined according to at least one of an RNTI and a system frame number.
6. A receiving method of a physical downlink control channel, which is used for a mobile communication terminal, wherein the receiving method comprises:
determining a target pattern selected from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces exclusive of resources exist in the physical downlink control channel candidate spaces included in any two search space patterns, wherein the search space corresponding to the aggregation level of the maximum value is a search space or a union of a plurality of search spaces;
and searching the physical downlink control channel in a search space corresponding to the target pattern.
7. The method for receiving a physical downlink control channel according to claim 6, wherein all physical downlink control channel candidate spaces included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.
8. The method for receiving a physical downlink control channel according to claim 6, further comprising:
receiving indication information for indicating the target pattern;
the step of determining a target pattern selected from the at least two search space patterns corresponding to the aggregation level specifically determines the target pattern according to the indication information.
9. The method of claim 8, wherein the indication information is carried by radio resource control signaling or downlink control information.
10. The method of claim 6, wherein in the step of determining a target pattern selected from the at least two search space patterns corresponding to the aggregation level, the target pattern is determined according to at least one of an RNTI and a system frame number.
11. A base station, comprising:
a processor, configured to determine an aggregation level of a physical downlink control channel;
the processor is further configured to select a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and in all the physical downlink control channel candidate spaces included in any two search space patterns, at least two physical downlink control channel candidate spaces exclusive of resources exist, wherein the search space corresponding to the aggregation level of the maximum value is one search space or a union of a plurality of search spaces;
and the transmitter is used for transmitting the physical downlink control channel by using the search space corresponding to the target pattern.
12. The base station of claim 11, wherein all physical downlink control channel candidate spaces included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.
13. The base station of claim 11, wherein the transmitter is further configured to transmit indication information indicating the target pattern.
14. The base station of claim 13, wherein the indication information is carried by radio resource control signaling or downlink control information.
15. The base station of claim 13, wherein the processor determines the target pattern based on at least one of an RNTI and a system frame number.
16. A mobile communication terminal, comprising:
a processor for determining a target pattern selected from at least two search space patterns corresponding to an aggregation level; the first resource set corresponding to each search space pattern is a subset of a second resource set of a search space corresponding to the aggregation level of the maximum value, and at least two physical downlink control channel candidate spaces exclusive of resources exist in the physical downlink control channel candidate spaces included in any two search space patterns, wherein the search space corresponding to the aggregation level of the maximum value is a search space or a union of a plurality of search spaces;
the processor is further configured to search the physical downlink control channel in a search space corresponding to the target pattern.
17. The mobile communication terminal of claim 16, wherein all the candidate spaces of the physical downlink control channel included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.
18. The mobile communication terminal of claim 16, further comprising:
a receiver for receiving indication information indicating the target pattern;
the processor determines the target pattern according to the indication information.
19. The mobile communication terminal of claim 18, wherein the indication information is carried by radio resource control signaling or downlink control information.
20. The mobile communication terminal of claim 16, wherein the processor determines the target pattern based on at least one of an RNTI and a system frame number.
21. A base station comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for transmitting a physical downlink control channel according to any one of claims 1 to 5 when executing the program.
22. A mobile communication terminal comprising a memory, a processor and a computer program stored on the memory and operable on the processor, wherein the processor executes the program to implement the method for receiving a physical downlink control channel according to any one of claims 6 to 10.
23. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for transmitting the physical downlink control channel according to any one of claims 1 to 5 or implements the method for receiving the physical downlink control channel according to any one of claims 6 to 10.
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| US20230247640A1 (en) * | 2020-05-25 | 2023-08-03 | Beijing Xiaomi Mobile Software Co., Ltd. | Methods and apparatus for sending and receiving physical downlink control channel, and electronic device |
| CN114070512B (en) * | 2020-08-06 | 2023-05-02 | 大唐移动通信设备有限公司 | Information receiving and transmitting method, equipment and storage medium |
| CN111970104A (en) * | 2020-10-22 | 2020-11-20 | 新华三技术有限公司 | Downlink control information transmission method, device and equipment |
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| US8989208B2 (en) * | 2009-04-30 | 2015-03-24 | Qualcomm Incorporated | PDCCH search space design for LTE-A multi-carrier operation |
| CN102056185B (en) * | 2009-10-31 | 2014-12-10 | 华为技术有限公司 | Channel blind detection method, channel assignment method and device |
| CN102843748B (en) * | 2011-06-22 | 2017-09-12 | 中兴通讯股份有限公司 | A kind of method and device of determination search space |
| CN103580838B (en) * | 2012-08-03 | 2016-09-14 | 电信科学技术研究院 | The transmission of Physical Downlink Control Channel strengthened and detection method and equipment |
| CN104717748A (en) * | 2013-12-11 | 2015-06-17 | 北京三星通信技术研究有限公司 | Physical downlink control channel (PDCCH) resource allocation method and device |
| CN106455069B (en) * | 2015-08-11 | 2022-02-01 | 中兴通讯股份有限公司 | Method and device for sending and receiving downlink control channel |
| US10356770B2 (en) * | 2015-10-01 | 2019-07-16 | Qualcomm Incorporated | Techniques for using an enhanced physical control format indicator channel to identify characteristics of a control region including a set of physical downlink control channels |
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