CN101699901B - Method and device for optimizing search space of user equipment - Google Patents

Abstract

The embodiment of the present invention discloses a method for optimizing a user equipment search space, including: receiving the UE's physical downlink control channel PDCCH search capability information reported by the user equipment UE; determining the UE based on the PDCCH search capability information reported by the UE The number of PDCCH candidate sets to be detected, and calculate the search space of the UE according to the number of PDCCH candidate sets. The embodiment of the present invention also provides a corresponding device for optimizing the search space of the user equipment and the user terminal equipment. The solution provided by the embodiments of the present invention can improve the success rate of PDCCH resource allocation, improve the UE search efficiency and thereby improve the utilization rate of PDCCH resources, and is beneficial to UE power saving.

Description

Method and device for optimizing user equipment search space

technical field

The present invention relates to the technical field of mobile communication, in particular to a method and device for optimizing a user equipment search space.

Background technique

The Long Term Evolution (LTE, Long Term Evolution) project is an evolution project of 3G, which improves and enhances 3G air access technology, Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) and Multiple Input Multiple Output (MIMO, Multiple Input The combination of MultipleOutput) is the main technical feature of LTE on the physical layer.

The downlink physical channels of LTE include Physical Downlink Shared Channel (PDSCH, PhysicalDownlink Shared Channel) and Physical Downlink Control Channel (PDCCH, PhysicalDownlink Control Channel), among which the Physical Downlink Shared Channel PDSCH is used to transmit shared data, which is the user The data that the equipment (UE) will eventually acquire; and the physical downlink control channel PDCCH is used to transmit uplink scheduling assignment and other control information and downlink scheduling assignment and other control information. That is to say, if the UE wants to obtain the shared data on the PDSCH, it must first obtain the scheduling information on its corresponding PDCCH.

A PDCCH uses a set of one or more Control Channel Elements (CCEs) as a transmission unit. Usually, a PDCCH can be composed of 1, 2, 4 or 8 CCEs.

In the prior art, in each downlink subframe, the PDCCHs of multiple UEs can be transmitted at one time, and the UE needs to analyze all the CCEs in the corresponding search space according to its own transmission mode, that is, perform blind detection, so as to find out whether There are control messages sent to itself.

When the UE blindly detects its own PDCCH, it needs to search in a certain area range according to certain rules, and the search range is defined as a search space. The search space is divided into two categories, that is, the public search space whose space size is fixed at 16CCE and the UE-specific search space whose space size varies according to different aggregation levels. Among them, the public search space only supports PDCCHs with two aggregation levels of 4CCE and 8CCE, that is, for a PDCCH space with a search space size of 16 CCEs, there are two aggregation levels of 4CCE or 8CCE, and the corresponding candidate sets are 4 (0-3 , 4-7, 8-11, 12-15) and 2 (0-7, 8-15); while the UE's dedicated search space can support aggregation levels of 1, 2, 4, and 8 CCE aggregation methods, The size of its space and the number of candidate sets also vary according to different aggregation levels, see Table 1 for details.

Table 1

In the above table, under a certain aggregation level, as long as any one of the search space size or the PDCCH candidate set is determined, the other one can be determined. That is, if the aggregation level and the size of the search space are known, the corresponding number of PDCCH candidate sets can be obtained; otherwise, if the aggregation level and the number of PDCCH candidate sets are known, the corresponding size of the search space can also be obtained.

During blind detection, the UE searches the search space according to the tree structure, so as to find out whether there is a PDCCH resource delivered to itself. For the UE's dedicated search space, the UE will perform blind detection according to each aggregation level in sequence, and the UE will stop blind detection of its dedicated search space until the PDCCH resource of the UE is detected, otherwise, the detection will fail. For the common search space, similarly, the UE needs to perform blind detection according to each aggregation level in order to determine whether there is a PDCCH resource of the UE in the common search space. Regardless of whether the UE detects its own PDCCH resource in the dedicated search space, the UE must detect the common search space.

When researching the subject of the present invention, the inventors found that the processing capabilities of each UE in the actual system are different, and the size of the search space that UEs with different processing capabilities can detect in a certain period of time is different, which may lead to some The search space resources of the UE are occupied by other UEs, which leads to the failure of PDCCH resource allocation of the UE. Especially when the network load is heavy, for those UEs that cannot be allocated to CCE resources due to resource overlap and have strong capabilities, they cannot be allocated resources due to the limitation of search space resources, so that PDCCH resources cannot be fully utilized.

Contents of the invention

Embodiments of the present invention provide a method and device for optimizing a user equipment search space, which can improve UE search efficiency and thereby improve PDCCH resource utilization.

A method for optimizing a user equipment search space provided by an embodiment of the present invention includes:

receiving the physical downlink control channel PDCCH search capability information of the UE reported by the user equipment UE;

The number of PDCCH candidate sets that the UE needs to detect is determined based on the PDCCH search capability information reported by the UE, and the search space of the UE is calculated according to the number of PDCCH candidate sets.

An apparatus for optimizing a user equipment search space provided by an embodiment of the present invention includes:

a UE capability acquisition unit, configured to acquire physical downlink control channel PDCCH search capability information of the user equipment UE;

The search space determination unit determines the number of PDCCH candidate sets that the UE needs to detect based on the acquired PDCCH search capability information, and calculates the search space of the UE.

A user terminal device provided by an embodiment of the present invention includes:

The search space calculation unit determines the number of PDCCH candidate sets according to the PDCCH search capability of the user terminal equipment, and calculates the corresponding search space based on the number of PDCCH candidate sets;

The search unit is used for performing blind detection in the calculated search space.

To sum up, in the technical solution provided by the embodiment of the present invention, the network side obtains the physical downlink control channel PDCCH search capability information of the user equipment UE, and refers to the capability information to determine the number of PDCCH candidate sets that the UE actually needs to detect, And calculate the search space of the UE according to the determined number of candidate sets, and then allocate PDCCH resources for the UE on the search space. When the network side determines the number of PDCCH candidate sets that the UE actually needs to detect, it can directly set the number of candidate sets corresponding to the capability information reported by the UE as the final number of PDCCH candidate sets that the UE needs to detect; Further determination can be made in combination with the capability information reported by the UE and the current load situation on the network side. If the network side further determines the number of PDCCH candidate sets that the UE actually needs to detect, it also needs to notify the UE of the determined number of candidate sets through signaling.

The UE side calculates its corresponding search space according to the number of candidate sets corresponding to the PDCCH search capability information reported by itself, or according to the number of candidate sets received from the network side, and performs blind detection. The solution provided by the embodiments of the present invention can improve the success rate of PDCCH resource allocation, improve the UE search efficiency and thereby improve the utilization rate of PDCCH resources, and is beneficial to UE power saving.

Description of drawings

FIG. 1 is a flowchart of a method for optimizing a search space provided in Embodiment 1 of the present invention;

FIG. 2 is a flowchart of a method for optimizing a search space provided in Embodiment 2 of the present invention;

FIG. 3 is a flowchart of a method for optimizing a search space provided by Embodiment 3 of the present invention;

FIG. 4 is a flowchart of a method for optimizing a search space provided in Embodiment 4 of the present invention;

FIG. 5 is a flowchart of a method for optimizing a search space provided in Embodiment 5 of the present invention;

FIG. 6 is a flowchart of a method for optimizing a search space provided in Embodiment 6 of the present invention;

FIG. 7 is a schematic diagram of an apparatus for optimizing a user equipment search space provided by an embodiment of the present invention;

Fig. 8 is a schematic diagram of user terminal equipment provided by an embodiment of the present invention.

Detailed ways

Aiming at the problem of low utilization efficiency of control channel resources (CCE) existing in the prior art, the embodiment of the present invention provides a method for optimizing the search space of the user equipment, and determines the size of the search space of the UE based on the processing capability of the user equipment UE in the actual system , in the same subframe, a larger search space is allocated to a UE with a stronger capability and a faster processing speed, and a smaller search space is allocated to a UE with a weaker capability and a slower processing speed, so that Improve the utilization efficiency of control channel resource (CCE). In the embodiment of the present invention, it is specifically embodied in determining the number of PDCCH candidate sets at each aggregation level according to the capabilities of the UE, for example, for a UE with strong capabilities, the value of the number of PDCCH candidate sets that may be obtained in one subframe is relatively large, and for a UE with a weaker capability, it may obtain a smaller number of PDCCH candidate sets.

In order to make the principles, characteristics and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with specific embodiments.

Embodiment one

Referring to FIG. 1, a method for optimizing a user equipment (UE) search space provided in this embodiment includes:

S101. The network side receives the physical downlink control channel PDCCH search capability information of the UE reported by the user equipment UE;

S102. Determine the number M ^(L) of PDCCH candidate sets that the UE currently needs to detect based on the reported PDCCH search capability information, and calculate the search space S _k ^(L) of the UE;

S103. Allocate corresponding control channel resources (control channel elements CCE) to the UE from the calculated search space.

In the technical solution provided by this embodiment, the network side obtains the PDCCH search capability information of the user equipment UE, and determines the number of PDCCH candidate sets that the UE needs to detect based on the search capability of the UE, and calculates the search space of the UE ; Allocating corresponding control channel resources to the UE from the calculated search space. In this way, the success rate of PDCCH resource allocation can be improved, the UE search efficiency can be improved, and the UE can save power.

Embodiment two

A method for optimizing a user equipment search space provided in this embodiment includes:

S201, the network side sends a UE capability inquiry message (UECapabilityEnquiry);

When the network side needs to obtain the radio access capability information (including PDCCH search capability) of the UE in the RRC connected state, the process of UE sending capability information is triggered. In order to obtain UE capability information (eg, the maximum number of PDCCH candidate sets that the UE can search), specifically, an inquiry message is sent to the UE, instructing the UE to report its PDCCH search capability information.

S202, the user equipment UE reports the physical downlink control channel PDCCH search capability information of the UE to the network side;

The UE puts the maximum number of PDCCH candidate sets that it can search into the UE Capability RAT-Container and reports it to the network side;

S203, the network side determines the number M ^(L) of PDCCH candidate sets that the UE can actually need to blindly detect in each subframe according to the maximum number of PDCCH candidate sets reported by the UE, and according to M ^(L) Calculating corresponding search space resources, and allocating corresponding PDCCH control channel resources CCE for the UE on the calculated search space resources;

Specifically, the decision may be made based on the PDCCH search capability reported by the UE combined with the current network load situation, and the number of PDCCH candidate sets that the UE currently needs to detect is determined. In another embodiment, when the network load is small, since the probability of search space conflict between UEs is relatively small when the load is large, at this time, the number of PDCCH sets that can be allocated to the UE within the capability of the UE M ^(L) is smaller, that is, M ^(L) ≤ the maximum number of PDCCH candidate sets that can be searched by the UE, so as to reduce the number of blind detections of the UE while allocating PDCCH resources to the UE, so as to improve the search efficiency and benefit The purpose of UE power saving; in another embodiment, when the network load is large, it is necessary to consider assigning a larger number of PDCCH sets M ^(L) to the UE within the capability of the UE, so that it can be used to a certain extent Improve the success rate of resource allocation.

S204, the network side sends the configured number M ^(L) of PDCCH candidate sets to the UE;

Specifically, the network side notifies the UE of the configured number M ^(L) of PDCCH candidate sets through control signaling.

S205, the UE calculates its corresponding search space according to the received M ^(L) , and performs blind detection in the calculated search space.

The formula for calculating M ^(L) according to the number of PDCCH candidate sets to calculate the search space S _k ^(L) of the corresponding UE may be:

where L∈{1, 2, 4, 8} is the aggregation level; i=0,...,L-1; m=0,...,M ^(L) -1, where M ^(L) is the PDCCH Candidate set; N _{CCE, k} is the total number of CCEs in the control domain in subframe k;

n_s为一个无线帧中的时隙号，n_s∈{0，1，...，19}，n_RNTI为对应用户的C-RNTI值。where Y _-1 = n _RNTI ≠ 0, A = 39827, D = 65537,

n _s is the time slot number in a radio frame, n _s ∈ {0, 1, ..., 19}, n _RNTI is the C-RNTI value of the corresponding user.

In order to understand the process of determining the search space more clearly, an example is given below:

N_CCE，k＝50；则分别计算：Assumption: the corresponding M ^(L) corresponding to L=1,2,4,8 is 6,6,2,2 respectively (that is, L=1 corresponds to M ^(L) =6, L=2 corresponds to M ^(L) =6 , L=4 corresponds to M ^(L) =2, L=8 corresponds to M ^(L) =2); n _RNTI =1;

N _{CCE, k} = 50; then calculate respectively:

When the aggregation level is 1, that is, when L=1, i=0, m=0, ..., M ^(L) -1=0, 1, 2, 3, 4, 5, for the UE-specific search space, Y _k ＝Y ₀ ＝(AY _-1 )modD＝(39827*1)mod65537＝39827, then by

The physical meaning of the above parameters can be understood as: the number of candidate sets M ^(L) can be understood as the number of groups that need to be divided into all resources calculated (each group needs to be detected once, so it can be understood as the number of times to be detected ); m represents the number of each group; i is the number of each element in each group. Therefore, the 6 values calculated in the example are the total number of CCEs that need to be detected for users whose aggregation level is 1CCE and C-RNTI is 1, and their numbers are 27, 28, 29, 30, 31, and 32 respectively. These 6 resources are divided into 6 groups (M ^(L) value), each group has only one element, therefore, the resource numbers corresponding to m=0, 1, 2, 3, 4, 5 are {27}, {28 }, {29}, {30}, {31}, {32}.

Similarly, when L=2, i=0, 1, m=0, ..., M ^(L) -1=0, 1, 2, 3, 4, 5, for the UE-specific search space, Y _k = Y ₀ =(A·Y _-1 )modD=(39827*1)mod65537=39827, then by

Same as the previous description, the 12 values obtained above are as follows: for a user whose C-RNTI is 1 with an aggregation level of 2CCE, the resource numbers to be detected are: 4, 5, ..., 15, a total of 6 to be detected The combinations of 2CCEs are respectively {4, 5}, {6, 7}, {8, 9}, {10, 11}, {12, 13}, {14, 15}.

The cases of L=3 and L=4 are analogized.

Afterwards, blind detection is performed in the calculated search space to find out whether there is resource assignment or other control information sent to itself.

During the process of blind detection, the control channel elements CCE in the space can be detected according to the corresponding tree structure.

In the technical solution provided by this embodiment, the network side obtains the physical downlink control channel PDCCH search capability information of the user equipment UE, and determines the PDCCH candidate set that the UE currently needs to detect based on the UE's search capability and the current network load condition and calculate the search space of the UE; allocate corresponding control channel resources to the UE from the calculated search space. The PDCCH resource allocation success rate can be improved, the UE search efficiency can be improved, and the UE can save power.

Embodiment three

The difference between this embodiment and Embodiment 2 is that the network side does not need to notify the UE of the configured number M ^(L) of PDCCH candidate sets, and the UE determines the largest PDCCH candidate set that can be detected by itself according to its own capabilities. number N, and calculate the corresponding search space according to the number N of the PDCCH candidate sets, and perform blind detection in the calculated search space.

Referring to FIG. 3, a method for optimizing a user equipment search space provided in this embodiment includes:

Steps S301-S302 are basically the same as S201-S202 in Embodiment 2, and will not be repeated here;

S303, the network side directly calculates the search space of the UE based on the number of PDCCH candidate sets reported by the UE, the calculation method is the same as step S205, and allocates PDCCH resources to it;

S304, the UE determines the maximum number of PDCCH candidate sets that can be detected by itself according to its own capability, calculates its corresponding search space, and performs blind detection.

Specifically, based on the number of PDCCH candidate sets reported by the UE, the corresponding search space may be calculated using a method similar to that in step S205;

Afterwards, blind detection is performed in the calculated search space to discover whether there is resource assignment or other control information sent to itself.

During the process of blind detection, the control channel elements CCE in the space can be detected according to the corresponding tree structure.

In the technical solution provided by this embodiment, the UE determines the maximum number N of PDCCH candidate sets that can be detected by itself based on its own capabilities, and calculates its corresponding search space according to the number N of PDCCH candidate sets; from the calculated search space Allocate corresponding control channel resources for the UE. The UE search efficiency can be improved and the UE can save power.

Embodiment Four

In this embodiment, the capabilities of the UE are divided into different levels in advance, and each capability level of the UE corresponds to the corresponding number of PDCCH candidate sets. The UE stores the corresponding relationship between each capability level and the number of PDCCH candidate sets, or the corresponding relationship is delivered to the UE through a broadcast message by the network side before.

The UE reports its level to the network side, and the network side allocates the UE search space according to the level reported by the UE, and notifies the UE.

Referring to FIG. 4, a method for optimizing a user equipment search space provided in this embodiment includes:

S401, the network side sends a UE capability inquiry message (UECapabilityEnquiry);

In order to obtain UE capability information, including the maximum number of PDCCH candidate sets that the UE can search, it is necessary to send an inquiry message to request the UE to report the capability information.

S402, the user equipment UE reports to the network side the level of the physical downlink control channel PDCCH search capability of the UE;

The UE puts its own PDCCH search capability level into the UE capability radio access technology container (ueCapabilityRAT-Container), and reports it to the network side;

S403, the network side determines the number of PDCCH candidate sets that the UE can actually detect currently according to the PDCCH search capability level reported by the UE, and calculates the corresponding search space according to the number of the PDCCH candidate sets, and uses the calculated search space resource Allocate the corresponding PDCCH control channel resource CCE for the UE;

Specifically, the decision may be made based on the determined number of PDCCH candidate sets combined with the current network load situation. When the network load is small, the probability of conflict between search spaces between UEs ^is relatively small when the load is large. number) to allocate a smaller PDCCH candidate set M ^(L) to the UE, so as to reduce the number of blind detections of the UE while allocating PDCCH resources to the UE, so as to achieve the purpose of improving search efficiency and benefiting UE power saving; on the contrary Specifically, when the network load is large, it is necessary to consider allocating a large number of PDCCH candidate sets M ^(L) to the UE within the capability of the UE, so as to improve the success rate of resource allocation to a certain extent.

S404, the network side sends the configured number M ^(L) of PDCCH candidate sets to the UE;

Specifically, the eNB on the network side notifies the UE of the configured number M ^(L) of PDCCH candidate sets through control signaling.

S405, the UE calculates its corresponding search space according to the received M ^(L) , and performs blind detection in the calculated search space.

Specifically, a method similar to that in step S205 can be used to calculate the corresponding search space;

Afterwards, blind detection is performed in the calculated search space to discover whether there is resource assignment or other control information sent to itself.

During the process of blind detection, the control channel elements CCE in the space can be detected according to the corresponding tree structure.

In the technical solution provided by this embodiment, the network side determines the number M ^(L) of the corresponding PDCCH candidate sets that the current UE needs to detect according to the capability level reported by the UE, and calculates the search rate of the UE according to the M ^(L) value. space, and allocate corresponding CCE resources to it on the calculated search space. The PDCCH resource allocation success rate can be improved, the UE search efficiency can be improved, and the UE can save power.

Embodiment five

The difference between this embodiment and Embodiment 4 is that the network side directly uses the number of candidate sets corresponding to the capability level reported by the UE as the number M ^(L) of PDCCH candidate sets that the UE needs to detect, and performs Calculation of the UE search space, and further allocation of PDCCH resources for the UE. Therefore, the network side does not need to notify the UE of the number M ^(L) of the configured PDCCH candidate sets, and the UE directly determines the number N of PDCCH candidate sets to be detected according to its own capability level, and according to the PDCCH candidate set The number N calculates its corresponding search space, and performs blind detection in the calculated search space.

Referring to FIG. 5, a method for optimizing a user equipment search space provided in this embodiment includes:

Steps S501-S502 are basically the same as S401-S402 in Embodiment 4, and will not be repeated here;

S503, the network side directly uses the number of candidate sets corresponding to the capability level reported by the UE as the number M ^(L) of PDCCH candidate sets that the UE needs to detect, and calculates the UE search space according to this value, and then allocates PDCCH resources;

S504. Determine the number N of PDCCH candidate sets that you need to detect according to the level of your own capabilities (the value of N at this time is the M ^(L) value on the network side), and calculate its corresponding PDCCH candidate set according to the number N of the PDCCH candidate sets. search space, and perform blind detection in the calculated search space.

Based on the pre-divided correspondence between each capability level and the number of PDCCH candidate sets, the UE determines the number N of PDCCH candidate sets to be detected according to its own capability level;

Specifically, a method similar to that in step S205 can be used to calculate the corresponding search space;

Afterwards, blind detection is performed in the calculated search space to find out whether there is resource assignment or other control information sent to itself.

During the process of blind detection, the control channel elements CCE in the space can be detected according to the corresponding tree structure.

Embodiment six

In this embodiment, based on the number of search channel candidate sets of the UE under each existing aggregation level, the UE capability information reported to the network side is a multiple value of the number of corresponding search channel sets under a certain aggregation level. The number of search channel candidate sets of the UE at the aggregation level is shown in Table 1. The network side calculates the actual number of candidate sets and the corresponding search space resources according to the multiple value reported by the UE, and allocates corresponding CCE resources to them in the determined search space.

Referring to FIG. 6, a method for optimizing a user equipment search space provided in this embodiment includes:

S601, the network side sends a UE capability inquiry message (UECapabilityEnquiry);

In order to obtain UE capability information, including the maximum number of PDCCH candidate sets that the UE can search, it is necessary to send an inquiry message to request the UE to report the capability information.

S602, the user equipment UE reports to the network side the PDCCH search capability of the UE, that is, the multiple value of the number of PDCCH candidate sets under the corresponding aggregation level;

Include a multiple value of the number of corresponding search channel candidate sets under an aggregation level in the UE capability radio access technology container (ueCapabilityRAT-Container), and report to the network side;

S603, the network side determines the number M (L) of the PDCCH candidate sets that the UE can detect according to the multiple value of the number of corresponding search channel candidate sets of the aggregation level reported by the UE, and calculates the corresponding search channel according to M ^{(L )} space, and allocate the corresponding PDCCH control channel resource CCE for the UE on the calculated search space resource;

S604, the UE calculates its corresponding search space according to the multiple value of the number of PDCCH candidate sets that can be searched by itself, and performs blind detection in the calculated search space.

Specifically, a method similar to that in step S205 can be used to calculate the corresponding search space;

Afterwards, blind detection is performed in the calculated search space to discover whether there is resource assignment or other control information sent to itself.

During the process of blind detection, the control channel elements CCE in the space can be detected according to the corresponding tree structure.

In this embodiment, the UE capability information reported to the network side can also be set as a multiple value of the corresponding search space size under each aggregation level based on the size of the UE search space under each existing aggregation level. Each aggregation level The size of the search space of the UE is shown in Table 1. The network side calculates the corresponding search space size according to the multiple value reported by the UE, and then obtains the number of candidate sets and corresponding search space resources, and allocates corresponding CCE resources to them in the determined search space. The specific process of search space allocation is basically the same, and will not be repeated here.

Referring to FIG. 7 , an embodiment of the present invention also provides an apparatus 700 for optimizing a user equipment search space, including:

UE capability information acquiring unit 710, configured to acquire physical downlink control channel PDCCH search capability information of user equipment UE;

The search space determination unit 720 determines the number of PDCCH candidate sets that the UE needs to detect based on the acquired PDCCH search capability information, and calculates the search space of the UE;

The search space determining unit 720 includes:

The PDCCH candidate set determination module 721 selects the number of PDCCH candidate sets that the UE actually needs to detect within the limit of the maximum number of PDCCH candidate sets that the UE can detect based on the PDCCH search capability information reported by the UE.

Specifically, the PDCCH candidate set determination module 721 may make a decision based on the PDCCH search capability reported by the UE and the current network load situation, and determine the number of PDCCH candidate sets that the UE currently needs to detect. In another embodiment, when the network load is small, since the probability of search space conflict between UEs is relatively small when the load is large, at this time, the number of PDCCH sets that can be allocated to the UE within the capability of the UE M ^(L) is smaller, ie

M ^(L) ≤ UE maximum number of PDCCH candidate sets that can be searched

In order to reduce the number of blind detections of the UE while allocating PDCCH resources to the UE, so as to improve the search efficiency and help the UE to save power; in addition, when the network load is large, it needs to be considered within the UE's capability A larger number of PDCCH sets M ^(L) is allocated to the UE, so as to improve the success rate of resource allocation to a certain extent.

The search space calculation module 722 calculates the search space of the UE according to the number of the PDCCH candidate sets.

The apparatus 700 for optimizing the user equipment search space further includes:

The resource allocation unit 730 is configured to allocate control channel resources for the UE.

Control channel resources are selected from the calculated search space and allocated to the UE.

Referring to FIG. 8, the embodiment of the present invention also provides a user terminal device 800, including:

The search space calculation unit 810 determines the number of PDCCH candidate sets according to the PDCCH search capability of the user terminal equipment, and calculates the corresponding search space based on the number of PDCCH candidate sets;

The method for calculating the search space by the search space calculation unit 810 may specifically adopt the method for calculating the search space as described in step S205 in the foregoing method or other methods, which will not be repeated here.

The search unit 820 is configured to perform blind detection in the calculated search space.

To sum up, in the technical solution provided by the embodiments of the present invention, the network side obtains the PDCCH search capability information of the user equipment UE, and determines the search capability information based on the UE's search capability directly or further combined with the current network load. The number of PDCCH candidate sets that the UE currently needs to detect is calculated, and the search space of the UE is calculated; corresponding control channel resources are allocated to the UE from the calculated search space. When the network side judges the number of PDCCH candidate sets that the UE needs to detect in combination with the current load situation, it should also send the judged number of candidate sets to the UE. The UE side either calculates the corresponding search space according to the number of candidate sets corresponding to its own capability information or according to the number of candidate sets sent by the network side, and performs blind detection. The PDCCH resource allocation success rate can be improved, the UE search efficiency can be improved to improve the PDCCH resource utilization rate, and the UE can save power.

Obviously, those skilled in the art should understand that each unit or each step in the above-mentioned embodiments of the present invention can be implemented by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed among multiple computing devices. Optionally, they can be implemented with program codes executable by computing devices, thus, they can be stored in storage devices and executed by computing devices, or they can be made into individual integrated circuit modules, or It is realized by making multiple units or steps among them into a single integrated circuit module. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only exemplary implementations of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims (12)

1. the optimization method in a user equipment searches space is characterized in that, comprising:

Receive the physical downlink control channel PDCCH search capability information of this UE of reported by user equipment UE;

The PDCCH search capability information that reports based on said UE is confirmed the PDCCH Candidate Set number of the required detection of said UE, and calculates the search volume of said UE according to this PDCCH Candidate Set number;

From the search volume that calculates, distribute the control channel resource for said UE.

2. the method for claim 1 is characterized in that, said physical downlink control channel PDCCH search capability information is the maximum PDCCH Candidate Set number that can detect of said UE;

The said PDCCH Candidate Set quantity of confirming the current required detection of said UE specifically comprises:

The PDCCH Candidate Set number of in the maximum PDCCH Candidate Set number limit that can detect of said UE, selecting the UE actual needs to detect.

3. the method for claim 1 is characterized in that, said physical downlink control channel PDCCH search capability information is the PDCCH search capability grade under the said UE, the corresponding corresponding PDCCH Candidate Set number of said ability rating;

The said PDCCH Candidate Set quantity of confirming the current required detection of said UE specifically comprises:

Confirm the PDCCH Candidate Set number that the UE actual needs detects based on the corresponding PDCCH Candidate Set number of said ability rating.

4. the method for claim 1 is characterized in that,

Said physical downlink control channel PDCCH search capability information is the multiple value that converges the corresponding PDCCH Candidate Set of grade number;

The said PDCCH Candidate Set quantity of confirming the current required detection of said UE specifically comprises:

Confirm the PDCCH Candidate Set number that the UE actual needs detects based on the said multiple value that converges the corresponding PDCCH Candidate Set of grade number.

5. the method for claim 1 is characterized in that, the physical downlink control channel PDCCH search capability information of this UE of reported by user equipment UE is the multiple value that converges UE search volume size under the grade; This multiple value is corresponding to a PDCCH Candidate Set number;

The said PDCCH Candidate Set quantity of confirming the current required detection of said UE specifically comprises:

Confirm the PDCCH Candidate Set number that the UE actual needs detects based on the said multiple value that converges the corresponding search volume of grade size.

6. like each described method in the claim 1 to 4, it is characterized in that the said PDCCH Candidate Set number of confirming the required detection of said UE comprises: confirm to be specially the PDCCH Candidate Set number of the required detection of said UE according to the current network loading condition:

Offered load hour is confirmed the PDCCH Candidate Set of lesser amt for said UE;

When offered load is big, confirm the PDCCH Candidate Set of a greater number for said UE.

7. like each described method in the claim 1 to 4, it is characterized in that, also comprise:

The PDCCH Candidate Set number of the required detection of said UE that network side will be confirmed is handed down to UE.

8. the method for claim 1 is characterized in that, also comprises:

UE receives the PDCCH Candidate Set number that network side issues;

UE calculates corresponding search volume according to received Candidate Set number;

Calculate it the search volume carry out blind Detecting.

9. the method for claim 1 is characterized in that, also comprises:

UE calculates corresponding search volume according to the own pairing Candidate Set number of ability information that is reported;

Calculate it the search volume carry out blind Detecting.

10. a device of optimizing the user equipment searches space is characterized in that, comprising:

UE ability acquiring unit is used to obtain the physical downlink control channel PDCCH search capability information of user equipment (UE);

The unit is confirmed in the search volume, confirms the PDCCH Candidate Set number of the required detection of said UE based on the PDCCH search capability information of being obtained, and calculates the search volume of said UE;

Resource allocation unit distributes the control channel resource for said UE from the search volume that calculates.

11. device as claimed in claim 10 is characterized in that, said search volume confirms that the unit comprises:

PDCCH Candidate Set determination module is based on the PDCCH search capability information that said UE reports, the PDCCH Candidate Set number of in the maximum PDCCH Candidate Set number limit that can detect of said UE, selecting the UE actual needs to detect;

The search volume computing module calculates the search volume of said UE according to this PDCCH Candidate Set number.

12. a subscriber terminal equipment is characterized in that, comprising:

The search volume computing unit is used to receive the said network side PDCCH Candidate Set number definite according to the PDCCH search capability of subscriber terminal equipment that network side issues, and calculates corresponding search volume based on this PDCCH Candidate Set number;

Search unit is used for carrying out blind Detecting in the search volume that is calculated.

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