CN109041243B - Sending method and receiving method of physical downlink control channel and related equipment - Google Patents

Abstract

The present invention provides a method for sending a physical downlink control channel, a method for receiving and related equipment. The sending 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; and the first resource set corresponding to each search space pattern is a maximum value In the subset of the second resource set of the search space corresponding to the aggregation level, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources; using the The physical downlink control channel is sent in the search space corresponding to the target pattern. The method for sending the physical downlink control channel provided by the present invention can increase the number of user equipments that can be scheduled by the physical downlink control channel, and improve the utilization rate of the resources of the physical downlink control channel.

Description

A method for sending and receiving a physical downlink control channel, and related equipment

technical field

The present invention relates to the field of communication technologies, and in particular, to a method for sending and receiving a physical downlink control channel and related equipment.

Background technique

PDCCH (Physical Downlink Shared Channel, Physical Downlink Control Channel) can be used to indicate the PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) scheduling corresponding to the UE (User Equipment, user equipment), or the PUSCH (Physical Uplink Shared Channel) to be sent. , physical uplink shared channel) scheduling time-frequency resources and transmission parameters, but to obtain these information, the UE needs to detect the PDCCH first.

LTE (Long Term Evolution) uses blind detection to allow the UE to obtain its own PDCCH, but the control region occupies the entire bandwidth in the frequency domain and the first 3 or 4 OFDM (Orthogonal Frequency Division Multiplexing, orthogonal) in the time domain. Frequency division multiplexing) symbols, if completely blind detection, requires longer processing time.

The search space can effectively narrow the scope of blind detection, which defines some resource locations, and the PDCCH of the UE may only appear in these limited resource locations, which can narrow the scope of blind detection, help the UE to improve the PDCCH detection efficiency, and reduce the UE's PDCCH detection efficiency. The complexity of blind detection. One PDCCH is transmitted on n consecutive CCEs (Control Channel Element, Control Channel Element), and the PDCCH has 4 formats, corresponding to aggregation levels {1, 2, 4, 8} respectively. The aggregation level indicates the number of consecutive CCEs occupied by a PDCCH.

In 5G NR (New Radio, New Radio Access), the PDCCH candidate space of different aggregation levels in the search space adopts a hierarchical design method, and the starting positions of the PDCCH candidate spaces of different aggregation levels in LTE are independent of each other. , In the hierarchical search space of 5G NR, the CCE position of the PDCCH candidate space of the lower aggregation level needs to be included in the CCE position of the PDCCH candidate space of the higher aggregation level. For example, under the structure of continuous distribution of CCEs, all aggregation The starting positions of the candidate spaces of levels (1, 2, 4, 8) are all the same. Since the CCE positions of candidate spaces of different aggregation levels overlap with each other, the hierarchical search space can reduce the complexity of UE blind detection by multiplexing the channel estimation of RE (Resource Element, resource unit), but it will also cause confusion between different candidate spaces. The collision probability is greater than LTE.

Specifically, the UE-specific search space in 5G adopts a hierarchical search space design method, and the CCE positions of the low aggregation level (relative to the highest aggregation level) are located within the CCE positions of the highest aggregation level. If the CCEs in the PDCCH candidate spaces of different aggregation levels are distributed continuously, the collision probability between the PDCCH candidate spaces will be very large. If the CCEs in the PDCCH candidate spaces of different aggregation levels are distributed in a discontinuous manner, the CCE overlap 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 with the same search space starting position, the number of CCEs that can be used in the low aggregation level candidate space is limited, and the idle CCE positions cannot be used for other data transmissions. PDCCH The number of UEs that can be scheduled is still very low, and the resource utilization of 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 PDCCH resource utilization rate 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 at most 2 UEs using aggregation level 4, see Figures 1 and 2 . In the PDCCH candidate space pattern of this fixed search space, the CCE position of the PDCCH candidate space of the low aggregation level is fixed relative to the position of the candidate space of the aggregation level 8. When the PDCCH candidate of the highest aggregation level of the specific search space of different UEs is fixed When the starting position of the space is the same, the PDCCH can only schedule 2 UEs with aggregation level 4 at most, and the resources of the 8 idle CCEs can no longer be used for PDCCH to schedule other UEs with aggregation level 4.

It can be seen from the above that, for the problem of low resource utilization of the physical downlink control channel, no effective solution has been proposed yet.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a method for sending a physical downlink control channel, a method for receiving it, and related equipment, so as to improve the 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, which is used for a base station, and the sending method includes:

determining the aggregation level of the physical downlink control channel;

A target pattern is 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, any In all physical downlink control channel candidate spaces included in the two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources;

The physical downlink control channel is sent using the search space corresponding to the target pattern.

The embodiment of the present invention also provides a method for receiving a physical downlink control channel, which is used for a mobile communication terminal, and the receiving method includes:

Determine 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, In the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources;

The physical downlink control channel is searched in the search space corresponding to the target pattern.

An embodiment of the present invention further provides a base station, the base station includes:

a processor, configured to determine the aggregation level of the 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 the first resource set of the search space corresponding to the aggregation level with the largest value. Two subsets of resource sets, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources;

A transmitter, configured to send the physical downlink control channel by using the search space corresponding to the target pattern.

The embodiment of the present invention also provides a mobile communication terminal, the mobile communication terminal includes:

The processor is configured to determine 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 the second resource of the search space corresponding to the aggregation level with the maximum value In the subset of the set, in the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources;

The processor is further configured to search for 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, including a memory, a processor, and a computer program stored on the memory and running on the processor, where the processor implements the above-mentioned physical downlink control when executing the program The sending method of the channel.

An embodiment of the present invention further provides a mobile communication terminal, including a memory, a processor, and a computer program stored on the memory and running on the processor, where the processor implements the above-mentioned physical system when executing the program. A method of receiving downlink control channels.

Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, implements the above-mentioned method for sending a physical downlink control channel, or implements the above-mentioned method for receiving a physical downlink control channel .

In this embodiment of the present invention, the aggregation level of the physical downlink control channel is determined; a target pattern is selected from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is the maximum In the subset of the second resource set of the search space corresponding to the aggregation level of the value, in all the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources; using The physical downlink control channel is sent in the search space corresponding to the target pattern. Since each aggregation level corresponds to at least two search space patterns, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, so that the physical downlink control channel candidate space can be increased. The number of user equipments that can be scheduled by the downlink control channel improves the utilization rate of the resources of the physical downlink control channel.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

1 shows a schematic diagram of a search space pattern provided by the related art;

FIG. 2 is a schematic diagram of yet another search space pattern provided by the related art;

FIG. 3 shows a flowchart of a method for sending a physical downlink control channel provided by an embodiment of the present invention;

4 is a schematic diagram of a search space pattern provided by an embodiment of the present invention;

FIG. 5 shows a schematic diagram of a search space pattern provided by another embodiment of the present invention;

FIG. 6 shows a schematic diagram of a search space pattern provided by another embodiment of the present invention;

FIG. 7 shows a schematic diagram of a search space pattern provided by another embodiment of the present invention;

FIG. 8 shows a schematic diagram of a search space pattern provided by another embodiment of the present invention;

FIG. 9 shows a schematic diagram of a search space pattern provided by another embodiment of the present invention;

FIG. 10 shows a schematic diagram of a search space pattern provided by another embodiment of the present invention;

11 is a schematic diagram of a search space pattern with an aggregation level of 4 provided by an embodiment of the present invention;

FIG. 12 shows a schematic diagram of user equipment scheduling with an aggregation level of 4 provided by an embodiment of the present invention;

13 shows a schematic diagram of a search space pattern when the starting position of the UE search space is different according to an embodiment of the present invention;

14 shows a flowchart of a method for receiving a physical downlink control channel provided by an embodiment of the present invention;

FIG. 15 shows a schematic diagram of a base station provided by an embodiment of the present invention;

FIG. 16 shows a schematic diagram of a mobile communication terminal provided by an embodiment of the present invention;

FIG. 17 shows a schematic diagram of a base station provided by another embodiment of the present invention;

FIG. 18 is a schematic diagram of a mobile communication terminal according to another embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a method for sending a physical downlink control channel, and the sending method is used for a base station. By setting multiple search space patterns for each aggregation level respectively, in all the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, so as to increase the physical downlink control channel The number of user equipments that can be scheduled by the control channel improves the resource utilization of the physical downlink control channel.

Referring to FIG. 3, FIG. 3 shows a flowchart of a method for sending a physical downlink control channel provided by an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:

Step 301: Determine the aggregation level of the physical downlink control channel.

In this embodiment, the aggregation level indicates the number of continuous CCEs (Control Channel Element, control channel elements) occupied by one PDCCH (Physical Downlink Shared Channel, physical downlink control channel). Specifically, the PDCCH may have multiple formats, such as four formats, corresponding to aggregation levels {1, 2, 4, 8} respectively.

Specifically, the eNodeB (Evolved Node B, Evolved Node B) can determine the aggregation level of a certain PDCCH according to factors such as channel quality. ), then 1 CCE can be used to send the PDCCH, that is, it is determined that the PDCCH corresponds to aggregation level 1; if the PDCCH is sent to a UE with poor downlink channel quality, it may be necessary to use 8 CCEs to send the PDCCH to Sufficient robustness is achieved, that is, it is determined that the PDCCH corresponds to aggregation level 8.

Step 302: 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 sub-set of the second resource set of the search space corresponding to the aggregation level with the largest value. Set, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources.

In this embodiment, the aggregation levels of the search spaces may be respectively. 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 is set with multiple different search space patterns. Specifically, each aggregation level may correspond to at least two search space patterns respectively, and in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources.

It should be noted that this embodiment does not limit the number of physical downlink control channel candidate spaces (ie, PDCCH Candidates) included in each search space pattern, and the size and location of the included physical downlink control channel candidate spaces. 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, wherein the aggregation level with the maximum value The corresponding search space can be one search space or the union of multiple search spaces.

Step 303: Use the search space corresponding to the target pattern to send the physical downlink control channel.

In this embodiment, different search space patterns can be configured for different PDCCHs, and the PDCCHs are sent through the search spaces corresponding to the different search space patterns, so as to improve the utilization rate of PDCCH resources.

The present embodiment will be described below with reference to FIGS. 4 to 10 :

Referring to Figure 4, a certain aggregation level corresponds to three search space patterns, namely search space pattern #1, search space pattern #2 and search space pattern #3, space pattern #1, search space pattern #2 and search space pattern #3 The corresponding resource sets are all subsets of the resource sets of the search space corresponding to the aggregation level with the maximum value. The search space pattern #1, search space pattern #2 and search space pattern #3 all include a PDCCH candidate space, and the search space pattern #1. The PDCCH candidate spaces of search space pattern #2 and search space pattern #3 do not overlap, that is, PDCCH candidate spaces with exclusive resources, so that 3 UEs using this aggregation level can be scheduled in the search space.

Referring to FIG. 5, a certain aggregation level corresponds to two search space patterns, namely search space pattern #1 and search space pattern #2, search space pattern #1 and search space pattern #2 both include two PDCCH candidate spaces, and the search space The candidate spaces of pattern #1 and search space pattern #2 also do not overlap, that is, they are both PDCCH candidate spaces with exclusive resources, so that 4 UEs using this aggregation level can be scheduled in the search space.

Referring to FIG. 6 , a certain aggregation level corresponds to two search space patterns, namely search space pattern #1 and search space pattern #2. Both search space pattern #1 and search space pattern #2 include two PDCCH candidate spaces, but the same as in Fig. In comparison, in FIG. 6 , the search space pattern #1 and the search space pattern #2 have an overlapping PDCCH candidate space, so that only three UEs using this aggregation level can be scheduled in the search space at most.

Referring to FIG. 7 , a certain aggregation level corresponds to two search space patterns, namely search space pattern #1 and search space pattern #2. Both search space pattern #1 and search space pattern #2 include two PDCCH candidate spaces, the same as in FIG. 6 . , there is an overlapping PDCCH candidate space between the search space pattern #1 and the search space pattern #2 in FIG. 7 , so that only 3 UEs using this aggregation level can be scheduled in the search space at most.

Referring to Figure 8, a certain aggregation level corresponds to three search space patterns, namely search space pattern #1, search space pattern #2 and search space pattern #3, search space pattern #1, search space pattern #2 and search space pattern # 3 each includes two PDCCH candidate spaces, in which search space pattern #1 and search space pattern #3, and search space pattern #2 and search space pattern #3 respectively have an overlapping PDCCH candidate space, so that at most the search space can only be used in the search space. 4 UEs using this aggregation level are internally scheduled.

Referring to FIG. 9, a certain aggregation level corresponds to 2 search space patterns, namely search space pattern #1 and search space pattern #2, search space pattern #1 and search space pattern #2 both include 3 PDCCH candidate spaces, and the search space The candidate spaces of pattern #1 and search space pattern #2 also do not overlap, that is, they are both PDCCH candidate spaces with exclusive resources, so that 6 UEs using this aggregation level can be scheduled in the search space.

Referring to Figure 10, a certain aggregation level corresponds to three search space patterns, namely search space pattern #1, search space pattern #2 and search space pattern #3, search space pattern #1, search space pattern #2 and search space pattern # 3 each includes 3 PDCCH candidate spaces, and search space pattern #1 and search space pattern #2 have an overlapping PDCCH candidate space, so that only 5 UEs using this aggregation level can be scheduled in the search space at most.

It can be seen from the above that the CCE positions covered by different search space patterns in this embodiment 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 positions, so that more UEs can be scheduled, and the utilization rate of PDCCH resources is improved.

In the method for sending a physical downlink control channel provided by the embodiment of the present invention, the aggregation level of the physical downlink control channel is determined; a target pattern is selected from at least two search space patterns corresponding to the aggregation level; each search space pattern corresponds to The first resource set is a subset of the second resource set in the search space corresponding to the aggregation level of the maximum value, and in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two exclusive resources. The physical downlink control channel candidate space; the physical downlink control channel is sent by using the search space corresponding to the target pattern. Since each aggregation level corresponds to at least two search space patterns, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, so that the physical downlink control channel candidate space can be increased. The number of user equipments that can be scheduled by the downlink control channel improves the utilization rate of the resources of the physical downlink control channel.

Optionally, all physical downlink control channel candidate spaces included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.

In this embodiment, in order to make full use of PDCCH resources, all physical downlink control channel candidate spaces included in at least two search space patterns corresponding to the aggregation levels have exclusive resources. For example, referring to FIG. 5, a certain aggregation level corresponds to search space pattern #1 and search space pattern #2, wherein the four PDCCH candidate spaces included in search space pattern #1 and search space pattern #2 all occupy resources exclusively, so that in the Four UEs using this aggregation level can be scheduled in the search space. Compared with the search space pattern shown in FIG. 6 , the utilization rate of PDCCH resources can be further improved.

Optionally, the method for sending the physical downlink control channel further includes: sending indication information for indicating the target pattern.

In this embodiment, the base station may reduce the complexity of blind detection by the UE by sending indication information for indicating the target pattern. For example, referring to FIG. 9 , assuming that the target pattern is search space pattern #1, if the indication information indicating the target pattern is not sent, the 6 PDCCH candidate spaces included in search space pattern #1 and search space pattern #2 need to be blinded. Detection, if the indication information for indicating the target pattern is sent, so that the UE can only detect the PDCCH candidate space included in the target pattern, that is, it only needs to perform blind detection on the 3 PDCCH candidate spaces included in the search space pattern #1. Effectively reduce the complexity of blind detection, reduce the time required for blind detection, and improve blind detection efficiency.

Optionally, the indication information is carried by radio resource control signaling or downlink control information.

In this embodiment, the base station may carry the above-mentioned indication information to the UE through RRC (Radio Resource Control, radio resource control) signaling or DCI (Downlink Control Information, downlink control information).

Specifically, the base station indication period may be a semi-static indication or a dynamic indication, wherein the semi-static indication of the base station may be indicated by high-level signaling, for example, RRC (Radio Resource Control, Radio Resource Control) signaling; the dynamic indication of the base station may be indicated by The DCI (Downlink Control Information, downlink control information) in the PDCCH is carried. For example, when the UE receives the PDCCH in a certain time slot, after the UE solves the search space pattern selection sequence number indicated in the DCI, it can select the indicated search space pattern when blindly detecting the PDCCH in the next time slot.

Optionally, in the step of selecting the target pattern from at least two search space patterns corresponding to the aggregation level, the target pattern is specifically determined according to at least one of RNTI and system frame number.

In this embodiment, the target pattern may be determined according to parameters of the UE, for example, RNTI (Radio Network Tempory Identity, wireless network temporary identity), system frame number, and the like.

For example, the hash function of RNTI can be used to select the search space pattern. Specifically, the following formula can be used to select the search space pattern:

是使用聚合等级为L的搜索空间图样的序号，i为当前子帧号，D_L为聚合等级为L的搜索空间图样的个数。in,

is the sequence number of the search space pattern with aggregation level _L , i is the current subframe number, and DL is the number of search space patterns with aggregation level L.

The embodiments of the present invention will be described below with reference to specific examples, wherein the aggregation level of the maximum value is aggregation level 8:

Taking the aggregation level of 4 as an example, in the search space of 16 CCEs, the aggregation level can correspond to 6 different search space patterns. For example, as shown in Figure 11, search space pattern #1, search space pattern #2 , Search Space Pattern #3, Search Space Pattern #4, Search Space Pattern #5, and Search Space Pattern #6. See, in the search space pattern with aggregation level 4, the PDCCH can schedule up to 4 UEs using aggregation level 4. For example, as shown in FIG. 12, UE#1, UE#2, UE#3 and UE#4, increase resource utilization of PDCCH. At the same time, for each UE, the number of PDCCH candidate spaces whose aggregation level is 4 is still 2, which does not increase the complexity of its PDCCH blind detection.

The above is to consider that when the starting positions of the search spaces of different UEs are the same, a larger number of UEs can be scheduled through the search space pattern, and the collision probability between the PDCCH candidate spaces is reduced at the same time. When the starting positions of the UEs in the search space are different, the embodiment of the present invention can also schedule the maximum number of UEs in the limited PDCCH resources. As shown in Figure 13, the starting positions of search space #1 and search space #2 differ by 8 CCEs. By configuring different search space patterns for different UEs, a maximum of 6 CCE resources can be scheduled within the 24 CCE resources using the aggregation level of 4 UEs.

It can be seen from the above that in this embodiment, different search space patterns are designed for the low aggregation level of the UE-specific search space (the aggregation level relative to the maximum value), that is, the CCE position of the low aggregation level PDCCH candidate space is relative to the maximum value. The CCE positions in the aggregation level PDCCH candidate space are not fixed. These search space patterns have partial CCE overlap, and different UEs can be configured with different search space patterns, and correspondingly perform blind detection in their respective search space patterns. Since the CCE positions covered by different search space patterns are different, the collision probability between PDCCH candidate spaces can be reduced.

The embodiment of the present invention also provides a method for receiving a physical downlink control channel, which is used for a mobile communication terminal. FIG. 14 shows a flowchart of a method for receiving a physical downlink control channel provided by an embodiment of the present invention. As shown in FIG. 14 , the method for receiving a physical downlink control channel includes the following steps:

Step 1401: Determine 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 the second resource set of the search space corresponding to the maximum aggregation level. Subset, in the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources.

In this embodiment, a plurality of different search space patterns may be set for the aggregation levels of the search space, for example, at least one of aggregation level 1, aggregation level 2, and aggregation level 4. Specifically, each aggregation level may correspond to at least two search space patterns respectively, and in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources.

It should be noted that this embodiment does not limit the number of physical downlink control channel candidate spaces included in each search space pattern and the size and position of the included physical downlink control channel candidate spaces. 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, wherein the aggregation level with the maximum value The corresponding search space can be one search space or the union of multiple search spaces.

Specifically, the base station may select one search space pattern as the target pattern based on at least two search space patterns corresponding to the aggregation level of the PDCCH, so as to transmit the PDCCH through the search space corresponding to the target pattern. Correspondingly, the mobile communication terminal may first determine the target pattern to search for the PDCCH from the search space corresponding to the target pattern.

Step 1402: Search for the physical downlink control channel in the search space corresponding to the target pattern.

In this embodiment of the present invention, a target pattern selected from at least two search space patterns corresponding to the aggregation level is determined; the first resource set corresponding to each search space pattern is the second resource set corresponding to the search space corresponding to the aggregation level with the largest value. A subset of the resource set, in the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources; searching for the physical downlink control channel candidate space in the search space corresponding to the target pattern Physical downlink control channel. Since each aggregation level corresponds to at least two search space patterns, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, so that the physical downlink control channel candidate space can be increased. The number of user equipments that can be scheduled by the downlink control channel improves the utilization rate of the resources of the physical downlink control channel.

Optionally, all physical downlink control channel candidate spaces included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.

In this embodiment, in order to make full use of PDCCH resources, all physical downlink control channel candidate spaces included in at least two search space patterns corresponding to the aggregation levels have exclusive resources. For example, referring to FIG. 5, a certain aggregation level corresponds to search space pattern #1 and search space pattern #2, wherein the four PDCCH candidate spaces included in search space pattern #1 and search space pattern #2 all occupy resources exclusively, so that in the Four UEs using this aggregation level can be scheduled in the search space. Compared with the search space pattern shown in FIG. 6 , the utilization rate of PDCCH resources can be further improved.

Optionally, the method for receiving the physical downlink control channel further includes: receiving indication information for indicating the target pattern; the step of determining the target pattern selected from at least two search space patterns corresponding to the aggregation level Specifically, the target pattern is determined according to the indication information.

In this embodiment, the mobile communication terminal can reduce the complexity of blind detection by 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 search space pattern #1, if there is no indication information indicating the target pattern, the mobile communication terminal needs to determine the 6 PDCCH candidates included in search space pattern #1 and search space pattern #2 Blind detection of the space is performed. If the indication information for indicating the target pattern is sent, the UE can only detect the PDCCH candidate space included in the target pattern, that is, only the 3 PDCCH candidate spaces included in the search space pattern #1 need to be blindly performed. The detection can effectively reduce the complexity of blind detection, reduce the time required for blind detection, and improve the efficiency of blind detection.

Optionally, the indication information is carried by radio resource control signaling or downlink control information.

In this embodiment, the above-mentioned indication information may be carried through RRC (Radio Resource Control, radio resource control) signaling or DCI (Downlink Control Information, downlink control information).

Optionally, in the step of determining a target pattern selected from at least two search space patterns corresponding to the aggregation level, the target pattern is specifically determined according to at least one of RNTI and system frame number.

In this embodiment, the target pattern may be determined according to parameters of the UE, for example, RNTI (Radio Network Tempory Identity, wireless network temporary identity), system frame number, and the like.

For example, the hash function of RNTI can be used to select the search space pattern. Specifically, the following formula can be used to select the search space pattern:

是使用聚合等级为L的搜索空间图样的序号，i为当前子帧号，D_L为聚合等级为L的搜索空间图样的个数。in,

is the sequence number of the search space pattern with aggregation level _L , i is the current subframe number, and DL is the number of search space patterns with aggregation level L.

The embodiment of the present invention also provides a base station. FIG. 15 is a schematic diagram of a base station provided by an embodiment of the present invention. As shown in FIG. 15 , the base station 1500 includes a processor 1501 and a transmitter 1502, where:

a processor 1501, configured to determine the 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 the search space corresponding to the maximum aggregation level. In the subset of the second resource set, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources;

The transmitter 1502 is configured to use the search space corresponding to the target pattern to send the physical downlink control channel.

Optionally, all physical downlink control channel candidate spaces 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 send indication information for indicating the target pattern.

Optionally, the indication information is carried by radio resource control signaling or downlink control information.

Optionally, the processor 1501 specifically determines the target pattern according to at least one of RNTI and 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; selects a target pattern from at least two search space patterns corresponding to the aggregation level; the first resource corresponding to each search space pattern The set is a subset of the second resource set of the search space corresponding to the aggregation level with the maximum value. In all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channels with exclusive resources. Candidate space; the transmitter 1502 uses the search space corresponding to the target pattern to send the physical downlink control channel. Since each aggregation level corresponds to at least two search space patterns, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, so that the physical downlink control channel candidate space can be increased. The number of user equipments that can be scheduled by the downlink control channel improves the utilization rate of the resources of the physical downlink control channel.

The embodiment of the present invention also provides a mobile communication terminal. FIG. 16 is a schematic diagram of a mobile communication terminal provided by an embodiment of the present invention. As shown in FIG. 16 , the mobile communication terminal 1600 includes a processor 1601 and a receiver 1602, wherein:

The processor 1601 is configured to determine 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 the second resource set corresponding to the search space corresponding to the aggregation level with the maximum value. For a subset of the resource set, in the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources;

The processor 1601 is further configured to search for the physical downlink control channel in the search space corresponding to the target pattern.

Optionally, all physical downlink control channel candidate spaces 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 for indicating the target pattern; the processor 1601 specifically determines the target pattern according to the indication information.

Optionally, the indication information is carried by radio resource control signaling or downlink control information.

Optionally, the processor 1601 specifically determines the target pattern according to at least one of RNTI and system frame number.

In the mobile communication device of the embodiment of the present invention, the processor 1601 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 the aggregation level with the maximum value In the subset of the second resource set of the corresponding search space, in the physical downlink control channel candidate space included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources; in the target pattern corresponding to The physical downlink control channel is searched in the search space of . Since each aggregation level corresponds to at least two search space patterns, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, so that the physical downlink control channel candidate space can be increased. The number of user equipments that can be scheduled by the downlink control channel improves the utilization rate of the resources of the physical downlink control channel.

The embodiment of the present invention also provides a base station. FIG. 17 is a schematic diagram of a base station provided by 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 stored in the memory 1701 and running on the processor 1702 17011, the processor 1702 implements the following steps when executing the program 17011:

determining the aggregation level of the physical downlink control channel;

A target pattern is 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, any In all physical downlink control channel candidate spaces included in the two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources;

The physical downlink control channel is sent using the search space corresponding to the target pattern.

Optionally, all physical downlink control channel candidate spaces 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 step: sending indication information for indicating the target pattern.

Optionally, the indication information is carried by radio resource control signaling or downlink control information.

Optionally, in the step of selecting the target pattern from at least two search space patterns corresponding to the aggregation level, the target pattern is specifically determined according to at least one of RNTI and system frame number.

In the base station of the embodiment of the present invention, the aggregation level of the physical downlink control channel is determined; a target pattern is selected from at least two search space patterns corresponding to the aggregation level; the first resource set corresponding to each search space pattern is the largest In the subset of the second resource set of the search space corresponding to the aggregation level of the value, in all the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources; The physical downlink control channel is sent using the search space corresponding to the target pattern. Since each aggregation level corresponds to at least two search space patterns, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, so that the physical downlink control channel candidate space can be increased. The number of user equipments that can be scheduled by the downlink control channel improves the utilization rate of the resources of the physical downlink control channel.

Referring to FIG. 18 , an embodiment of the present invention further provides a mobile communication terminal. The mobile communication terminal 1800 includes a memory 1801 , a processor 1802 , and a computer program 18011 stored in the memory 1801 and running on the processor 1802 . , the processor 1802 implements the following steps when executing the program 18011:

Determine 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, In the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources;

The physical downlink control channel is searched in the search space corresponding to the target pattern.

Optionally, all physical downlink control channel candidate spaces included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.

Optionally, the processor 1802 executes the program 18011 to further implement the following steps: receiving indication information for indicating the target pattern; the determining is selected from the target in at least two search space patterns corresponding to the aggregation level In the pattern step, the target pattern is specifically determined according to the indication information.

Optionally, the indication information is carried by radio resource control signaling or downlink control information.

Optionally, in the step of selecting the target pattern from at least two search space patterns corresponding to the aggregation level, the target pattern is specifically determined according to at least one of RNTI and system frame number.

The mobile communication device according to the embodiment of the present 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 the search corresponding to the aggregation level with the maximum value. A subset of the second resource set of the space, in the physical downlink control channel candidate space included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources; in the search space corresponding to the target pattern to search for the physical downlink control channel. Since each aggregation level corresponds to at least two search space patterns, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, so that the physical downlink control channel candidate space can be increased. The number of user equipments that can be scheduled by the downlink control channel improves the utilization rate of the resources of the physical downlink control channel.

Embodiments of the present invention further provide a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the method for sending a physical downlink control channel according to any of the foregoing method embodiments.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the methods of the above embodiments can be completed by program instructions related to hardware, and the program can be stored in a computer-readable medium. When the program is executed, the program includes: The following steps:

determining the aggregation level of the physical downlink control channel;

A target pattern is 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, any In all physical downlink control channel candidate spaces included in the two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources;

The physical downlink control channel is sent using the search space corresponding to the target pattern.

Optionally, all physical downlink control channel candidate spaces included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.

Optionally, when the program is executed, the following step is further included: sending indication information for indicating the target pattern.

Optionally, the indication information is carried by radio resource control signaling or downlink control information.

Optionally, in the step of selecting the target pattern from at least two search space patterns corresponding to the aggregation level, the target pattern is specifically determined according to at least one of RNTI and system frame number.

Embodiments of the present invention further provide a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the method for receiving a physical downlink control channel according to any of the above method embodiments.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the methods of the above embodiments can be completed by program instructions related to hardware, and the program can be stored in a computer-readable medium. When the program is executed, the program includes: The following steps:

Determine 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, In the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources;

The physical downlink control channel is searched in the search space corresponding to the target pattern.

Optionally, all physical downlink control channel candidate spaces included in the at least two search space patterns corresponding to the aggregation level have exclusive resources.

Optionally, when the program is executed, the program further includes the following steps: receiving indication information for indicating the target pattern; the step of determining the target pattern selected from the at least two search space patterns corresponding to the aggregation level is specific in the step. The target pattern is determined according to the indication information.

Optionally, the indication information is carried by radio resource control signaling or downlink control information.

Optionally, in the step of selecting the target pattern from at least two search space patterns corresponding to the aggregation level, the target pattern is specifically determined according to at least one of RNTI and system frame number.

The storage medium is, for example, a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk or an optical disk, and the like.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (23)

1. A method for sending a physical downlink control channel, used in a base station, wherein the sending method comprises: determining the aggregation level of the physical downlink control channel; A target pattern is 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, any Among all the physical downlink control channel candidate spaces included in the two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, where the search space corresponding to the aggregation level with the maximum value is a search space, or Union of multiple search spaces; The physical downlink control channel is sent using the search space corresponding to the target pattern. 2 . The method for sending a physical downlink control channel according to claim 1 , wherein all physical downlink control channel candidate spaces included in at least two search space patterns corresponding to the aggregation level occupy exclusive resources. 3 . 3. The method for sending a physical downlink control channel according to claim 1, further comprising: Send indication information for indicating the target pattern. 4 . The method for sending a physical downlink control channel according to claim 3 , wherein the indication information is carried by radio resource control signaling or downlink control information. 5 . 5. The method for sending a physical downlink control channel according to claim 3, wherein in the step of selecting a target pattern from at least two search space patterns corresponding to the aggregation level, specifically according to the RNTI, the system frame number At least one of the target patterns is determined. 6. A method for receiving a physical downlink control channel, used for a mobile communication terminal, wherein the receiving method comprises: Determine 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, In the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, where the search space corresponding to the aggregation level with the maximum value is a search space, or Union of multiple search spaces; The physical downlink control channel is searched in the 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 at least two search space patterns corresponding to the aggregation level occupy exclusive resources. 8 . 8. The method for receiving a physical downlink control channel according to claim 6, further comprising: receiving indication information for indicating the target pattern; In the step of determining a target pattern selected from at least two search space patterns corresponding to the aggregation level, the target pattern is specifically determined according to the indication information. 9 . The method for receiving a physical downlink control channel according to claim 8 , wherein the indication information is carried by radio resource control signaling or downlink control information. 10 . 10. The method for receiving a physical downlink control channel according to claim 6, wherein in the step of determining a target pattern selected from at least two search space patterns corresponding to the aggregation level, specifically according to RNTI, system At least one of the frame numbers determines the target pattern. 11. A base station, comprising: a processor, configured to determine the aggregation level of the 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 the first resource set of the search space corresponding to the aggregation level with the largest value. Two subsets of resource sets, in all physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, among which, the search corresponding to the aggregation level with the largest value The space is a search space, or the union of multiple search spaces; A transmitter, configured to send the physical downlink control channel by using the search space corresponding to the target pattern. 12 . The base station according to claim 11 , wherein all physical downlink control channel candidate spaces included in at least two search space patterns corresponding to the aggregation levels have exclusive resources. 13 . 13. The base station according to claim 11, wherein the transmitter is further configured to send indication information for indicating the target pattern. The base station according to claim 13, wherein the indication information is carried by radio resource control signaling or downlink control information. The base station according to claim 13, wherein the processor specifically determines the target pattern according to at least one of RNTI and system frame number. 16. A mobile communication terminal, comprising: The processor is configured to determine 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 the second resource of the search space corresponding to the aggregation level with the maximum value A subset of the set, in the physical downlink control channel candidate spaces included in any two search space patterns, there are at least two physical downlink control channel candidate spaces with exclusive resources, wherein the search space corresponding to the aggregation level with the maximum value is one The search space, or the union of multiple search spaces; The processor is further configured to search for the physical downlink control channel in a search space corresponding to the target pattern. 17 . The mobile communication terminal according to claim 16 , wherein all physical downlink control channel candidate spaces included in at least two search space patterns corresponding to the aggregation level have exclusive resources. 18 . 18. The mobile communication terminal according to claim 16, further comprising: a receiver, configured to receive indication information for indicating the target pattern; The processor specifically determines the target pattern according to the indication information. The mobile communication terminal according to claim 18, wherein the indication information is carried by radio resource control signaling or downlink control information. 20. The mobile communication terminal according to claim 16, wherein the processor specifically determines the target pattern according to at least one of RNTI and system frame number. 21. A base station, comprising a memory, a processor, and a computer program stored on the memory and running on the processor, characterized in that, when the processor executes the program, the program as claimed in claim 1- The method for sending a physical downlink control channel according to any one of claim 5. 22. A mobile communication terminal, comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements the program as claimed in the claims when executing the program 6 - The method for receiving a physical downlink control channel according to any one of claims 10. 23. A computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, the method for sending a physical downlink control channel according to any one of claims 1 to 5 is implemented , or implement the method for receiving a physical downlink control channel according to any one of claims 6 to 10.

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