CN101699901A - Method and device for optimizing search space of user equipment - Google Patents
Method and device for optimizing search space of user equipment Download PDFInfo
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- CN101699901A CN101699901A CN200910196886A CN200910196886A CN101699901A CN 101699901 A CN101699901 A CN 101699901A CN 200910196886 A CN200910196886 A CN 200910196886A CN 200910196886 A CN200910196886 A CN 200910196886A CN 101699901 A CN101699901 A CN 101699901A
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Abstract
The embodiment of the invention discloses a method for optimizing the search space of user equipment, which comprises the following steps: receiving the search capability information of a physical downlink control channel (PDCCH) of the user equipment (UE), which is reported by the UE; based on the search capability information of the PDCCH, which is reported by the UE, determining the number of candidate sets of the PDCCH of the UE, which needs to be detected; and according to the number of the candidate sets of the PDCCH, calculating the search space of the UE. The embodiment of the invention also provides a corresponding device for optimizing the search space of the UE, and user terminal equipment. The scheme provided by the embodiment of the invention can increase the success ratio of resource allocation of the PDCCH and increase the search efficiency of the UE, thereby increasing the resource utilization ratio of the PDCCH and being beneficial to power saving of the UE.
Description
Technical field
The present invention relates to the mobile communication technology field, be specifically related to the optimization method and the device in user equipment searches space.
Background technology
Long Term Evolution (LTE, Long Term Evolution) project is the evolution items of 3G, improve and strengthened the aerial access technology of 3G, OFDM (OFDM, Orthogonal FrequencyDivision Multiplexing) combination with multiple-input, multiple-output (MIMO, Multiple Input MultipleOutput) is the major technology characteristics of LTE on physical layer.
The down physical channel of LTE includes Physical Downlink Shared Channel (PDSCH, PhysicalDownlink Shared Channel) and Physical Downlink Control Channel (PDCCH, PhysicalDownlink Control Channel) etc., wherein Physical Downlink Shared Channel PDSCH is used to transmit shared data, and this part data is the data that subscriber equipment (UE) finally will obtain; Physical downlink control channel PDCCH then is used for transmitting uplink scheduling distribution and other control informations and descending scheduling and distributes and other control informations.That is to say that UE wants to obtain the shared data on the PDSCH, at first must obtain the schedule information on its corresponding PDCCH.
PDCCH is a unit of transfer with the set that one or more control channels unit (CCE, Control Channel Element) constituted, and usually, a PDCCH can be by 1,2, and 4 or 8 CCE constitute.
In the prior art, in each descending sub frame, can once transmit the PDCCH of a plurality of UE, UE needs the transmission mode according to oneself, in corresponding search volume, remove to resolve all CCE, promptly carry out blind Detecting, thereby find whether to have the control information that sends to oneself.
UE need search for according to certain rule in certain areal extent when himself PDCCH of blind Detecting, and the scope of this search promptly is defined as the search volume.The search volume is divided into two big classes, and promptly the space size is fixed as the common search space of 16CCE and space size according to different polymerization ranks and the different proprietary search volume of UE.Wherein 4CCE and two kinds of other PDCCH of polymer grade of 8CCE are only supported in the common search space, are the PDCCH space of 16 CCE for the search volume size promptly, and two kinds of polymerization ranks of 4CCE or 8CCE are arranged, its corresponding Candidate Set is respectively 4 (0-3,4-7,8-11,12-15) and 2 (0-7,8-15); And the proprietary search volume of UE can support that the polymerization rank is 1,2,4, the polymerization methods of 8 CCE, and its space size and Candidate Set number are also different according to other difference of polymer grade, see table 1 for details.
Table 1
In the above table, under certain polymerization rank, as long as any one in the middle of definite search volume size or the PDCCH Candidate Set can be determined another one.If promptly known polymerization rank and search volume size can obtain corresponding PDCCH Candidate Set number; Otherwise, if known polymerization rank and PDCCH Candidate Set number can obtain corresponding search volume size equally.
During blind Detecting, UE can carry out the retrieval of search volume according to tree structure, so that find whether to have the PDCCH resource that is handed down to oneself.For the proprietary search volume of UE, UE can carry out blind Detecting according to each polymerization rank successively, and up to the PDCCH resource that detects this UE, UE just can stop the blind Detecting to its proprietary search volume, otherwise, detect failure.For the common search space, same, UE needs to carry out blind Detecting according to each polymerization rank successively, to determine whether to have the PDCCH resource of this UE in the common search space.No matter whether UE has detected the PDCCH resource of oneself in proprietary search volume, UE must go to detect the common search space.
When theme of the present invention is studied, the inventor finds that the disposal ability of each UE is different in the real system, the search volume size that the UE that disposal ability is different can detect in the regular hour is different, may cause the search volume resource of some UE to be occupied thus, thereby cause the PDCCH resource allocation failure of this UE by other UE.When offered load is big, can't be assigned to the CCE resource for those because resource overlaps, and the stronger UE of self-ability owing to the search volume resource limit is distributed less than resource, makes the PDCCH resource for being fully used especially.
Summary of the invention
The embodiment of the invention provides the optimization method and the device in a kind of user equipment searches space, improves the PDCCH resource utilization thereby can improve the UE search efficiency.
The optimization method in a kind of user equipment searches space that the embodiment of the invention provides comprises:
Receive the physical downlink control channel PDCCH search capability information of this UE of reported by user equipment UE;
Determine the PDCCH Candidate Set number of the required detection of described UE based on the PDCCH search capability information that described UE reports, and calculate the search volume of described UE according to this PDCCH Candidate Set number.
A kind of device of optimizing the user equipment searches space that the embodiment of the invention provides comprises:
UE ability acquiring unit is used to obtain the physical downlink control channel PDCCH search capability information of user equipment (UE);
The search volume determining unit is determined the PDCCH Candidate Set number of the required detection of described UE based on the PDCCH search capability information of being obtained, and calculates the search volume of described UE.
A kind of subscriber terminal equipment that the embodiment of the invention provides comprises:
The search volume computing unit is determined PDCCH Candidate Set number according to the PDCCH search capability of subscriber terminal equipment, 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.
In sum, in the technical scheme that the embodiment of the invention provides, network side obtains the physical downlink control channel PDCCH search capability information of user equipment (UE), and with reference to this ability information, determine the PDCCH Candidate Set number of the actual required detection of UE, and the search volume of calculating UE according to the Candidate Set number of determining, and then on this search volume, be this UE distribution PDCCH resource.Wherein network side is in the PDCCH Candidate Set number of determining the actual required detection of UE, and the pairing Candidate Set number of the ability information that can directly UE be reported is made as the PDCCH Candidate Set number of the final required detection of UE; Also can carry out further determining in conjunction with ability information and the current loading condition of network side that UE reports.If network side has done further to determine that it also needs to give UE with the Candidate Set number after determining by signaling to the PDCCH Candidate Set number of the actual required detection of UE.
UE side or according to the pairing Candidate Set number of PDCCH search capability information that self reported, perhaps the Candidate Set number that issues according to the network side that receives calculates its corresponding search volume, and carries out blind Detecting.The scheme that embodiments of the invention provided can improve PDCCH resource allocation success rate, improves the PDCCH resource utilization thereby improve the UE search efficiency, and helps the UE power saving.
Description of drawings
The optimization method flow chart of the search volume that Fig. 1 provides for the embodiment of the invention one;
The optimization method flow chart of the search volume that Fig. 2 provides for the embodiment of the invention two;
The optimization method flow chart of the search volume that Fig. 3 provides for the embodiment of the invention three;
The optimization method flow chart of the search volume that Fig. 4 provides for the embodiment of the invention four;
The optimization method flow chart of the search volume that Fig. 5 provides for the embodiment of the invention five;
The optimization method flow chart of the search volume that Fig. 6 provides for the embodiment of the invention six;
The device schematic diagram in the optimization user equipment searches space that Fig. 7 provides for the embodiment of the invention;
The subscriber terminal equipment schematic diagram that Fig. 8 provides for the embodiment of the invention.
Embodiment
The not high problem of control channel resource (CCE) utilization ratio at the prior art existence, the embodiment of the invention provides the method for optimizing the user equipment searches space, determine the search volume size of UE based on the disposal ability of user equipment (UE) in the real system, strong to ability in same subframe, processing speed is UE faster, for it distributes bigger search volume, and, processing speed slower UE weak to ability, for it distributes less search volume, thereby promote the utilization ratio of control channel resource (CCE).In embodiments of the present invention, be embodied as according to the ability of UE and determine every kind of number that converges the Candidate Set of PDCCH under the grade, for example strong UE to ability, it is bigger that it can an obtainable PDCCH Candidate Set numerical value in a subframe, and the UE more weak to ability, it may obtain less PDCCH Candidate Set number.
For making principle of the present invention, characteristic and advantage clearer, describe the present invention below in conjunction with specific embodiment.
Embodiment one
With reference to Fig. 1, the optimization method of a kind of subscriber equipment (UE) search volume that present embodiment provides comprises:
S101, the physical downlink control channel PDCCH search capability information of this UE that network side to receive user equipment UE reports;
S102 determines the PDCCH Candidate Set number M of the current required detection of described UE based on the PDCCH search capability information that is reported
(L), and calculate the search volume S of described UE
k (L)
S103 distributes control corresponding channel resource (control channel unit CCE) for described UE from the search volume that calculates.
In the technical scheme that present embodiment provides, network side obtains the PDCCH search capability information of user equipment (UE), and determines the PDCCH Candidate Set number that described UE need detect based on the search capability of this UE, and calculates the search volume of described UE; From the search volume that calculates, distribute the control corresponding channel resource for described UE.Can improve PDCCH resource allocation success rate like this, improve the UE search efficiency and help the UE power saving.
Embodiment two
The optimization method in a kind of user equipment searches space that present embodiment provides comprises:
S201, network side issue UE ability apply for information (UECapabilityEnquiry);
The wireless access capability information that need obtain the UE that is under the RRC connected state when network side triggers the flow process of UE transmitting capacity information when (comprising the PDCCH search capability).In order to obtain UE ability information (as the number of the maximum PDCCH Candidate Set that can search for of, UE), specifically pass through the transmission apply for information to described UE, indicate UE to report its PDCCH search capability information.
S202, user equipment (UE) report the physical downlink control channel PDCCH search capability information of this UE to network side;
UE is put the number of the own maximum PDCCH Candidate Set that can search for to UE ability wireless access technology container (ueCapabilityRAT-Container), reports network side;
S203, network side is the maximum PDCCH Candidate Set number that can search for according to UE reported, determine this UE current actual can be in each subframe the number M of the PDCCH Candidate Set of required blind Detecting
(L), and according to M
(L)Calculate corresponding search volume resource, and on the search volume resource that calculates, distribute corresponding PDCCH control channel resource CCE for this UE;
Particularly, can choose in conjunction with current network load condition, determine the PDCCH Candidate Set number of the current required detection of described UE based on the PDCCH search capability that described UE reports.In another embodiment, when offered load hour because little when the relative load of the conflicting probability in search volume is big between the UE, at this moment, can be in the limit of power of UE be the PDCCH collection numerical value M of this UE distribution
(L)Smaller, i.e. M
(L)The maximum PDCCH Candidate Set number that can search for of≤UE so that can reduce the blind Detecting number of times of UE when distributing to this UE PDCCH resource, improves search efficiency and helps the UE purpose of power saving thereby reach; In another embodiment, when offered load is big, just need to consider in the limit of power of UE, to distribute bigger PDCCH collection number M for this UE
(L), so that can improve the resource allocation success rate to a certain extent.
S204, network side is with the PDCCH Candidate Set number M of configuration
(L)Send to described UE;
Particularly, network side is by the PDCCH Candidate Set number M of control signaling with configuration
(L)Value is notified to UE.
S205, UE is according to received M
(L)Calculate its corresponding search volume, and calculate it the search volume carry out blind Detecting.
Calculate M according to PDCCH Candidate Set number
(L)Calculate the search volume S of corresponding UE
k (L)Formula can for:
Wherein { 1,2,4,8} is the polymerization rank to L ∈; I=0 ..., L-1; M=0 ..., M
(L)-1, M wherein
(L)Be the PDCCH Candidate Set; N
CCE, kTotal CCE number for control domain among the subframe k;
Y wherein
-1=n
RNTI≠ 0, A=39827, D=65537,
n
sBe a timeslot number in the radio frames, n
s∈ 0,1 ..., 19}, n
RNTIC-RNTI value for respective user.
In order more to be expressly understood definite process of this search volume, illustrate below:
Suppose: corresponding L=1,2,4,8 corresponding M
(L)Being respectively 6,6,2,2 (is the corresponding M of L=1
(L)=6, the corresponding M of L=2
(L)=6, the corresponding M of L=4
(L)=2, the corresponding M of L=8
(L)=2); n
RNTI=1;
N
CCE, k=50; Then calculate respectively:
The polymerization rank is 1 o'clock, promptly during L=1, and i=0, m=0 ..., M
(L)-1=0,1,2,3,4,5, to the proprietary search volume of UE, Y
k=Y
0=(AY
-1) modD=(39827*1) mod65537=39827, then by
The physical meaning of above-mentioned each parameter can be regarded as: the Candidate Set number M
(L)Value can be regarded as the group number that needs in all resources that calculate to be divided into (every group of needs detect once, thus it can be regarded as again need the number of times that detects); M represents the numbering of concrete each group; I is the numbering of each element in the middle of each group.So it is 1CCE that 6 values calculating in the example are the polymerization rank, C-RNTI is 1 user, total CCE number that it need detect, and its numbering is respectively 27,28,29,30,31,32, and these 6 resources are divided into 6 groups of (M
(L)Value), have only an element in the middle of every group, therefore, corresponding m=0,1,2,3,4,5 resource number is respectively { 27}, { 28}, { 29}, { 30}, { 31}, { 32}.
In like manner during L=2, i=0,1, m=0 ..., M
(L)-1=0,1,2,3,4,5, to the proprietary search volume of UE, Y
k=Y
0=(AY
-1) modD=(39827*1) mod65537=39827, then by
With aforesaid explanation, above-mentioned 12 values that draw are: for the polymerization rank is that the C-RNTI of 2CCE is 1 user, and its resource number that need detect is: 4,5 ..., 15, need to detect the combination of 6 2CCE altogether, be respectively 4,5}, and 6,7}, 8,9}, 10,11}, 12,13}, 14,15}.
Situation when L=3 and L=4 is analogized.
Afterwards, calculate it the search volume carry out blind Detecting, to find whether to exist resource assignation or other control informations that sends to oneself.
In the process of carrying out blind Detecting, can detect the control channel unit CCE in the described space according to corresponding tree structure.
In the technical scheme that present embodiment provides, network side obtains the physical downlink control channel PDCCH search capability information of user equipment (UE), and the PDCCH Candidate Set number of determining the current required detection of described UE based on search capability and the current loading condition of network of this UE, and calculate the search volume of described UE; From the search volume that calculates, distribute the control corresponding channel resource for described UE.Can improve PDCCH resource allocation success rate, improve the UE search efficiency and help the UE power saving.
Embodiment three
The difference of present embodiment and embodiment two is that network side does not need the PDCCH Candidate Set number M with configuration
(L)Notify described UE, UE is according to the ability of self, determines the own maximum PDCCH Candidate Set number N that can detect, and calculates its corresponding search volume according to this PDCCH Candidate Set number N, and calculate it the search volume carry out blind Detecting.
With reference to Fig. 3, the optimization method in a kind of user equipment searches space that present embodiment provides comprises:
Step S301-S302, basic identical with the S201-S202 among the embodiment two, no longer repeat at this;
The PDCCH Candidate Set number that S303, network side directly report up with UE is calculated the search volume of UE, and computational methods are with step S205, and is its distribution PDCCH resource;
S304, UE determines the own maximum PDCCH Candidate Set number that can detect according to the ability of self, and calculates its corresponding search volume, and carries out blind Detecting.
Specifically, can adopt the method that is similar among the step S205 to calculate corresponding search volume based on the PDCCH Candidate Set number that UE reported;
Afterwards, carry out blind Detecting, to find whether to exist resource assignation or other control informations that sends to oneself in the search volume that is calculated.
In the process of carrying out blind Detecting, can detect the control channel unit CCE in the described space according to corresponding tree structure.
In the technical scheme that present embodiment provides, UE determines the own maximum PDCCH Candidate Set number N that can detect based on the ability of self, and calculates its corresponding search volume according to this PDCCH Candidate Set number N; From the search volume that calculates, distribute the control corresponding channel resource for described UE.Can improve the UE search efficiency and help the UE power saving.
Embodiment four
In the present embodiment, the ability with UE is divided into different grades in advance, and each ability rating of UE is corresponded respectively to corresponding PDCCH Candidate Set number.UE preserves each ability rating and its PDCCH Candidate Set number corresponding relation, perhaps is handed down to UE by network side by broadcast before this corresponding relation.
UE reports network side with own affiliated grade, and the grade that network side reports up according to UE is again carried out the distribution of UE search volume, and it is notified to UE.
With reference to Fig. 4, the optimization method in a kind of user equipment searches space that present embodiment provides comprises:
S401, network side issue UE ability apply for information (UECapabilityEnquiry);
In order to obtain the UE ability information, comprise the number of the maximum PDCCH Candidate Set that can search for of UE, need to send apply for information request UE and report this ability information.
S402, user equipment (UE) report grade under the physical downlink control channel PDCCH search capability of this UE to network side;
UE is put own affiliated PDCCH search capability grade to UE ability wireless access technology container (ueCapabilityRAT-Container), and reports network side;
S403, network side is according to PDCCH search capability grade that UE reported, determine the PDCCH Candidate Set number that the current reality of this UE can detect, and calculate corresponding search volume, and on the search volume resource that calculates, distribute corresponding PDCCH control channel resource CCE for this UE according to this PDCCH Candidate Set number;
Particularly, can choose in conjunction with current network load condition based on the PDCCH Candidate Set number of determining.When offered load hour because little when the relative load of the conflicting probability in search volume is big between the UE, at this moment, can in the limit of power of UE, (be M
(L)The maximum PDCCH Candidate Set number that can search for of≤UE) distributes less PDCCH Candidate Set M for this UE
(L),, improve search efficiency and help the UE purpose of power saving thereby reach so that can when distributing to this UE PDCCH resource, reduce the blind Detecting number of times of UE; On the contrary, when offered load is big, just need be thought of as in the limit of power of UE and distributes bigger PDCCH Candidate Set number M for this UE
(L), so that can improve the resource allocation success rate to a certain extent.
S404, network side is with the PDCCH Candidate Set number M of configuration
(L)Send to described UE;
Particularly, network side eNB is by the PDCCH Candidate Set number M of control signaling with configuration
(L)Value is notified to UE.
S405, UE is according to received M
(L)Calculate its corresponding search volume, and carry out blind Detecting in the search volume that is calculated.
Specifically can adopt the method that is similar among the step S205 to calculate corresponding search volume;
Afterwards, carry out blind Detecting, to find whether to exist resource assignation or other control informations that sends to oneself in the search volume that is calculated.
In the process of carrying out blind Detecting, can detect the control channel unit CCE in the described space according to corresponding tree structure.
In the technical scheme that present embodiment provides, the ability rating that network side reports according to UE is determined the number M of the corresponding PDCCH Candidate Set of the required detection of current UE
(L), and according to M
(L)Value calculates the search volume of this UE, and distributes corresponding CCE resource for it on the search volume that calculates.Can improve PDCCH resource allocation success rate, improve the UE search efficiency and help the UE power saving.
Embodiment five
The difference of present embodiment and embodiment four is, the pairing Candidate Set number of ability rating that network side directly reports with UE is as the PDCCH Candidate Set number M of the required detection of UE
(L), and carry out the calculating of UE search volume according to this value, and then be that this UE distributes the PDCCH resource.Therefore network side does not need the PDCCH Candidate Set number M with configuration
(L)Reinform to described UE, UE directly determines the own PDCCH Candidate Set number N that needs detection according to grade under the ability of self, and calculates its corresponding search volume according to this PDCCH Candidate Set number N, and calculate it the search volume carry out blind Detecting.
With reference to Fig. 5, the optimization method in a kind of user equipment searches space that present embodiment provides comprises:
Step S501-S502, basic identical with the S401-S402 among the embodiment four, no longer repeat at this;
The pairing Candidate Set number of ability rating that S503, network side directly report with UE is as the PDCCH Candidate Set number M of the required detection of UE
(L), and carry out the calculating of UE search volume according to this value, and then be that this UE distributes the PDCCH resource;
S504, (the N value of this moment is the M of network side according to the definite PDCCH Candidate Set number N that oneself need detect of grade under the ability of self
(L)Value), and calculate its corresponding search volume according to this PDCCH Candidate Set number N, and calculate it the search volume carry out blind Detecting.
Based on each ability rating and its PDCCH Candidate Set number corresponding relation divided in advance, UE determines that according to grade under the ability of self oneself needs the PDCCH Candidate Set number N of detection;
Specifically can adopt the method that is similar among the step S205 to calculate corresponding search volume;
Afterwards, calculate it the search volume carry out blind Detecting, to find whether to exist resource assignation or other control informations that sends to oneself.
In the process of carrying out blind Detecting, can detect the control channel unit CCE in the described space according to corresponding tree structure.
Embodiment six
In the present embodiment, with existing every kind search channel Candidate Set number that converges UE under the grade is benchmark, the UE ability information that reports network side is the multiple value that converges the corresponding search channel collection number under the grade, respectively converges the search channel Candidate Set number of UE under the grade, and is as shown in table 1.The multiple value that network side reports according to UE is calculated actual Candidate Set number and corresponding search volume resource, and distributes corresponding C CE resource for it on determined search volume.
With reference to Fig. 6, the optimization method in a kind of user equipment searches space that present embodiment provides comprises:
S601, network side issue UE ability apply for information (UECapabilityEnquiry);
In order to obtain the UE ability information, comprise the number of the maximum PDCCH Candidate Set that can search for of UE, need to send apply for information request UE and report this ability information.
S602, the PDCCH search capability that user equipment (UE) reports this UE to have to network side is the corresponding multiple value that converges PDCCH Candidate Set number under the grade;
In UE ability wireless access technology container (ueCapabilityRAT-Container), comprise the multiple value that converges the corresponding search channel Candidate Set number under the grade, and report network side;
S603, network side determine the number M of the PDCCH Candidate Set that this UE can detect according to the multiple value of the corresponding search channel Candidate Set number that converges grade that UE reported
(L), and according to M
(L)Calculate corresponding search volume, and on the search volume resource that calculates, distribute corresponding PDCCH control channel resource CCE for this UE;
S604, UE calculates its corresponding search volume according to the multiple value of the PDCCH Candidate Set number that self can search for, and calculate it the search volume carry out blind Detecting.
Specifically can adopt the method that is similar among the step S205 to calculate corresponding search volume;
Afterwards, carry out blind Detecting, to find whether to exist resource assignation or other control informations that sends to oneself in the search volume that is calculated.
In the process of carrying out blind Detecting, can detect the control channel unit CCE in the described space according to corresponding tree structure.
In the present embodiment, can also existing every kind of search volume size that converges UE under the grade be benchmark, the UE ability information that reports network side is set to respectively converge the multiple value of the corresponding search volume size under the grade, respectively converges the search volume size of UE under the grade, and is as shown in table 1.Network side calculates corresponding search volume size according to the multiple value that UE reports, and then obtains Candidate Set number and corresponding search volume resource, and distributes corresponding C CE resource for it on determined search volume.The idiographic flow that the search volume is distributed is basic identical, does not repeat them here.
With reference to Fig. 7, the embodiment of the invention also provides a kind of device 700 of optimizing the user equipment searches space, comprising:
UE ability information acquiring unit 710 is used to obtain the physical downlink control channel PDCCH search capability information of user equipment (UE);
Search volume determining unit 720 is determined the PDCCH Candidate Set number of the required detection of described UE based on the PDCCH search capability information of being obtained, and calculates the search volume of described UE;
Described search volume determining unit 720 comprises:
PDCCH Candidate Set determination module 721 is based on the PDCCH search capability information that described UE reports, the PDCCH Candidate Set number of selecting the UE actual needs to detect in the maximum PDCCH Candidate Set number limit that can detect of described UE.
Particularly, PDCCH Candidate Set determination module 721 can be chosen in conjunction with current network load condition based on the PDCCH search capability that described UE reports, and determines the PDCCH Candidate Set number of the current required detection of described UE.In another embodiment, when offered load hour because little when the relative load of the conflicting probability in search volume is big between the UE, at this moment, can be in the limit of power of UE be the PDCCH collection numerical value M of this UE distribution
(L)Smaller, promptly
M
(L)The maximum PDCCH Candidate Set number that can search for of≤UE
So that can when distributing to this UE PDCCH resource, reduce the blind Detecting number of times of UE, improve search efficiency and help the UE purpose of power saving thereby reach; In addition, when offered load is big, just need to consider in the limit of power of UE, to distribute bigger PDCCH collection number M for this UE
(L), so that can improve the resource allocation success rate to a certain extent.
Search volume computing module 722 calculates the search volume of described UE according to this PDCCH Candidate Set number.
The device 700 that this optimizes the user equipment searches space also comprises:
From the search volume that calculates, select the control channel resource, and distribute described UE.
With reference to Fig. 8, the embodiment of the invention also provides a kind of subscriber terminal equipment 800, comprising:
Search volume computing unit 810 is determined PDCCH Candidate Set number according to the PDCCH search capability of subscriber terminal equipment, and calculates corresponding search volume based on this PDCCH Candidate Set number;
The method that search volume computing unit 810 calculates search volumes specifically can adopt the method or the additive method of the calculating search volume that step S205 describes in the method as described above, does not repeat them here.
Search unit 820 is used for carrying out blind Detecting in the search volume that is calculated.
In sum, in the technical scheme that the embodiment of the invention provides, network side obtains the physical downlink control channel PDCCH search capability information of user equipment (UE), and or directly determine the PDCCH Candidate Set number of the current required detection of described UE based on the search capability of this UE or further combined with the current loading condition of network, and calculate the search volume of described UE; From the search volume that calculates, distribute the control corresponding channel resource for described UE.When network side combines current loading condition the PDCCH Candidate Set number of the required detection of UE has been carried out judgement, it also should be handed down to UE with the Candidate Set number after the judgement.UE side or calculate corresponding search volume according to the pairing Candidate Set number of the ability information of self or according to the Candidate Set number that network side issues, and carry out blind Detecting.Can improve PDCCH resource allocation success rate, improve the PDCCH resource utilization thereby improve the UE search efficiency, and help the UE power saving.
Obviously, those skilled in the art should be understood that, each unit in the above-mentioned embodiment of the invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of unit in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is an exemplary embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (14)
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;
Determine the PDCCH Candidate Set number of the required detection of described UE based on the PDCCH search capability information that described UE reports, and calculate the search volume of described UE according to this PDCCH Candidate Set number.
2. the method for claim 1 is characterized in that, also comprises:
From the search volume that calculates, distribute the control channel resource for described UE.
3. the method for claim 1 is characterized in that, described physical downlink control channel PDCCH search capability information is the maximum PDCCH Candidate Set number that can detect of described UE;
The described PDCCH Candidate Set quantity of determining the current required detection of described UE specifically comprises:
The PDCCH Candidate Set number of in the maximum PDCCH Candidate Set number limit that can detect of described UE, selecting the UE actual needs to detect.
4. the method for claim 1 is characterized in that, described physical downlink control channel PDCCH search capability information is the PDCCH search capability grade under the described UE, the corresponding corresponding PDCCH Candidate Set number of described ability rating;
The described PDCCH Candidate Set quantity of determining the current required detection of described UE specifically comprises:
Determine the PDCCH Candidate Set number that the UE actual needs detects based on the PDCCH Candidate Set number of described ability rating correspondence.
5. the method for claim 1 is characterized in that,
Described physical downlink control channel PDCCH search capability information is the multiple value that converges the corresponding PDCCH Candidate Set of grade number;
The described PDCCH Candidate Set quantity of determining the current required detection of described UE specifically comprises:
Determine the PDCCH Candidate Set number that the UE actual needs detects based on the described multiple value that converges the corresponding PDCCH Candidate Set of grade number.
6. 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 described PDCCH Candidate Set quantity of determining the current required detection of described UE specifically comprises:
Determine the PDCCH Candidate Set number that the UE actual needs detects based on the described multiple value that converges the corresponding search volume of grade size.
7. as each described method in the claim 1 to 5, it is characterized in that the described PDCCH Candidate Set number of determining the required detection of described UE comprises: determine to be specially the PDCCH Candidate Set number of the required detection of described UE according to the current network loading condition:
Offered load hour is determined the PDCCH Candidate Set of lesser amt for described UE;
When offered load is big, determine the PDCCH Candidate Set of a greater number for described UE.
8. as each described method in the claim 1 to 5, it is characterized in that, also comprise:
The PDCCH Candidate Set number of the required detection of described UE that network side will be determined is handed down to UE.
9. 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.
10. 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.
11. 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 search volume determining unit is determined the PDCCH Candidate Set number of the required detection of described UE based on the PDCCH search capability information of being obtained, and calculates the search volume of described UE.
12. device as claimed in claim 11 is characterized in that, also comprises:
Resource allocation unit distributes the control channel resource for described UE from the search volume that calculates.
13., it is characterized in that described search volume determining unit comprises as claim 11 or 12 described devices:
PDCCH Candidate Set determination module is based on the PDCCH search capability information that described UE reports, the PDCCH Candidate Set number of selecting the UE actual needs to detect in the maximum PDCCH Candidate Set number limit that can detect of described UE;
The search volume computing module calculates the search volume of described UE according to this PDCCH Candidate Set number.
14. a subscriber terminal equipment is characterized in that, comprising:
The search volume computing unit is determined PDCCH Candidate Set number according to the PDCCH search capability of subscriber terminal equipment, 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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