CN101998429A - Method and equipment for indicating and acquiring CCE (Control Channel Element) aggregation length in carrier aggregation system - Google Patents
Method and equipment for indicating and acquiring CCE (Control Channel Element) aggregation length in carrier aggregation system Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and equipment for indicating and acquiring CCE (Control Channel Element) aggregation length in a carrier aggregation system. The method comprises the steps of: generating a L1/L2 control signaling, wherein the L1/L2 control signaling carries an indication to the CCE aggregation length of a currently-scheduled user terminal; and sending the L1/L2 control signaling to the currently-scheduled user terminal. By using the invention, the L1/L2 control signaling sent from a network side to the user terminal carries the indication to the CCE aggregation length so as to ensure that the user terminal can acquire the CCE aggregation length, and thus, the complexity of PDCCH (Physical Downlink Control Channel) blind detection in the carrier aggregation system is reduced.
Description
Technical field
The present invention relates to communication technical field, relate in particular to control channel cell CCE polymerization Length Indication method, acquisition methods and equipment in a kind of carrier aggregation system.
Background technology
At LTE (Long Term Evolution, Long Term Evolution) in the system, terminal need be to common search space and UE (User Equipment, user terminal) PDCCH of exclusive search volume (Physical Downlink Control Channel, Physical Downlink Control Channel) carries out blind Detecting simultaneously, the CCE of PDCCH (Control Channel Elements, control channel cell) polymerization grade can be 1,2,4,8.Under every kind of CCE polymerization grade, it is different needing the number of the candidate PDCCH of blind check, has provided description in the 9.1.1 of 3GPPTS36.213, specifically as shown in table 1:
Table 1.PDCCH candidates monitored by a UE
Simultaneously need the different DCI of two kinds of length of blind check (Downlink Control Information, Downlink Control Information) form for every kind of transmission mode, thus terminal to need the number of times of blind check be 44 times.
At LTE-Advanced (Long Term Evolution-Advanced, advanced Long Term Evolution, hereinafter to be referred as LTE-A) in the system, in order to support the system bandwidth wideer than LTE system, such as 100MHz, need by the resource of a plurality of LTE carrier waves (claiming member carrier again) is carried out using after the polymerization.Concrete polymerization methods comprises followingly having two kinds:
(1) a plurality of continuous LTE carrier waves is carried out polymerization, for LTE-A provides bigger transmission bandwidth.
(2) a plurality of discontinuous LTE carrier waves are carried out polymerization, for LTE-A provides bigger transmission bandwidth.The discontinuous carrier polymerization has more polymerization flexibility.One example of discontinuous carrier polymerization as shown in Figure 1.
In the prior art, method for the carrier aggregation system design is to keep and LTE Release 8 (LTE version 8 in the design of each carrier wave, hereinafter to be referred as LTE R8) as far as possible consistent, thereby guarantee the terminal of LTE R8 can be on each member carrier operate as normal.
During the standard of current LTE-A is discussed, consider the complexity of PDCCH design, the flexibility of scheduling, and the asymmetric carrier wave of up-downgoing (referring to that uplink and downlink have different number of carriers) polymerization situation, the design of the PDCCH of carrier aggregation system there are following two kinds of candidate schemes:
Scheme one: each carrier wave independently sends PDCCH, and this PDCCH only can dispatch the physical resource of this carrier wave, shown in Fig. 2 A.
Scheme two: use a plurality of independent PDCCH that is carried on a certain carrier wave to dispatch a plurality of carrier resources, this scheme is the improvement to scheme one, and in this case, each PDCCH can only dispatch the resource of a carrier wave, shown in Fig. 2 B.
In the PDCCH of R8 design, be to distinguish between the different DCI by length, at user side according to different polymerization grades, the maximum blind checks of DCI format 44 times, wherein the common search space is 12 times, user-specific search volume 32 times.
In the design of LTE-A, along with the increase of bandwidth, the length of DCI also will increase accordingly, and consider simultaneously in LTE-A and may support more transmission mode, such as CoMP, 8 antennas, multiuser MIMOs etc. are so the number of times of blind check can increase.
In the discussion of LTE, proposed multiple reduction blind Detecting complexity, mainly comprised:
(1) form of the current DCI of prompting promptly is to indicate the DCI form that is transmitted by increasing a form indication FI (Format Indication).As shown in Figure 3, FI and DCI absolute coding, like this at receiving terminal, UE at first deciphers FI, thereby judges that whether current DCI form is the current DCI form that detects of needing, and if not then DCI not being carried out folding coding, thereby reduces the complexity of blind check.
(2) increase mask (mask-CRC) by CRC, under the situation that does not change DCI length, can indicate plurality of application scenes, be equivalent to reduce the number of times of folding coding like this, can distinguish plurality of application scenes by a folding coding to DCI.It is that a user has distributed a plurality of RNTI (Radio Network Temporary Identity, Radio Network Temporary Identifier) that this method is equivalent to, and can increase the probability of CRC flase drop.This mode as shown in Figure 4, wherein
Expression mould 2 adds.
(3) pass through the CCE polymerization length of RRC (Radio Resource Control, radio resource control) signaling and MAC CE signaling terminal PDCCH, thereby reduce the number of times of UE blind check PDCCH.
The inventor is in realizing process of the present invention, find that there is following problem in implementation of the prior art: during by high-level signaling and MAC CE signaling user terminal CCE polymerization length, because the method for the notice of the Signalling exchange between network side and the terminal can cause the notice time delay of CCE polymerization length bigger.
Summary of the invention
Embodiments of the invention provide CCE polymerization Length Indication method, acquisition methods and equipment in a kind of carrier aggregation system, are used to make user terminal can know CCE polymerization length easily, thereby reduce the complexity of PDCCH blind check in the carrier aggregation system.
For achieving the above object, embodiments of the invention provide the indicating means of control channel cell CCE polymerization length in a kind of carrier aggregation system, comprising:
Generate L1/L2 control signaling, carry indication in the described L1/L2 control signaling the CCE polymerization length of the user terminal of current scheduling;
Described L1/L2 control signaling is sent to the user terminal of described current scheduling.
Wherein, described generation L1/L2 control signaling is carried the indication to the CCE polymerization length of the user terminal of current scheduling in the described L1/L2 control signaling, comprising:
The indication of the CCE polymerization length of described user terminal to current scheduling is carried among the Downlink Control Information DCI, the CRC of the Downlink Control Information DCI of the CCE polymerization length of indicating user terminal is carried out XOR by a predefined RNTI; Described DCI is put into predefined search volume.
Wherein, the described information bit that carries the DCI of the indication of the CCE polymerization length of the user terminal of current scheduling is identical with the information bit of one or more other DCI in the system.
Wherein, described predefined search volume comprises: common search space or the search volume of indicating by described predefined RNTI.
Wherein, also comprise:
For a plurality of user terminals, the indication of the CCE polymerization length of pre-configured each user terminal and the corresponding relation of the information field among the described DCI; Or
For the user terminal of multicarrier, the indication of a plurality of CCE polymerization length of pre-configured described user terminal and the corresponding relation of the information field among the described DCI; Or
When the CCE of current one or more user terminals polymerization length does not change, do not transmit the L1/L2 control signaling of the indication of carrying CCE polymerization length, adopt the last CCE polymerization length of using to carry out the transmission of PDCCH; When relevant user terminals did not receive the L1/L2 control signaling of the indication of carrying CCE polymerization length, it was identical with last CCE polymerization length to give tacit consent to current CCE polymerization length.
Embodiments of the invention also provide the acquisition methods of control channel cell CCE polymerization length in a kind of carrier aggregation system, comprising:
Receive the L1/L2 control signaling that network side sends, carry indication in the described L1/L2 control signaling CCE polymerization length;
Obtain CCE polymerization length according to described L1/L2 control signaling.
Wherein, describedly obtain CCE polymerization length according to described L1/L2 control signaling and comprise:
Obtain the Downlink Control Information DCI that carries in the described L1/L2 control signaling;
Bit length and predefined RNTI according to described DCI, DCI to indication CCE polymerization length in predefined search volume carries out blind check, and, obtain the CCE polymerization length of network side indication according to the indication of the corresponding relation of the indication of the CCE polymerization length of each pre-configured user terminal and the information field among the described DCI or pre-configured a plurality of CCE polymerization length and the corresponding relation of the information field among the described DCI.
Wherein, described predefined search volume comprises: common search space or the search volume of indicating by described predefined RNTI.
Wherein, also comprise:
When described user terminal did not receive the L1/L2 control signaling of the indication of carrying CCE polymerization length, it was identical with the CCE polymerization length that gets access to by last L1/L2 control signaling to give tacit consent to current CCE polymerization length.
Wherein, also comprise:
In the exclusive search volume of user terminal, the candidate PDCCH of described CCE polymerization length is carried out blind check.
Embodiments of the invention also provide a kind of base station, are used for the indication of carrier aggregation system CCE polymerization length, it is characterized in that, comprising:
Control signaling generation unit is used to generate L1/L2 control signaling, carries the indication to the CCE polymerization length of the user terminal of current scheduling in the described L1/L2 control signaling;
Control signaling transmitting element, the L1/L2 control signaling that is used for described control signaling generation unit is generated sends to the user terminal of described current scheduling.
Wherein, described control command generation unit specifically is used for:
The indication of the CCE polymerization length of described user terminal to current scheduling is carried among the DCI, the CRC of the Downlink Control Information DCI of the CCE polymerization length of indicating user terminal is carried out XOR by a predefined RNTI; Described DCI is put into predefined search volume.
Wherein, the described information bit that carries the DCI of the indication of the CCE polymerization length of the user terminal of current scheduling is identical with the information bit of one or more other DCI in the system.
Wherein, described predefined search volume comprises: common search space or the search volume of indicating by described predefined RNTI.
Wherein, it is characterized in that, also comprise: the corresponding relation dispensing unit is used for:
For a plurality of user terminals, the indication of the CCE polymerization length of pre-configured each user terminal and the corresponding relation of the information field among the described DCI; Or
For the user terminal of multicarrier, the indication of a plurality of CCE polymerization length of pre-configured described user terminal and the corresponding relation of the information field among the described DCI; Or
When the CCE of current one or more user terminals polymerization length does not change, do not transmit the L1/L2 control signaling of the indication of carrying CCE polymerization length, adopt the last CCE polymerization length of using to carry out the transmission of PDCCH; When described user terminal did not receive the L1/L2 control signaling of the indication of carrying CCE polymerization length, it was identical with last CCE polymerization length to give tacit consent to current CCE polymerization length.
Embodiments of the invention also provide a kind of user terminal, comprising:
Control signaling receiving element is used to receive the L1/L2 control signaling that network side sends, and carries the indication to CCE polymerization length in the described L1/L2 control signaling;
Polymerization length acquiring unit, the L1/L2 control signaling that is used for receiving according to described control signaling receiving element is obtained CCE polymerization length.
Wherein, described polymerization length acquiring unit specifically is used for:
Obtain the Downlink Control Information DCI that carries in the described L1/L2 control signaling;
Bit length and predefined RNTI according to described DCI, DCI to indication CCE polymerization length in predefined search volume carries out blind check, and, obtain the CCE polymerization length of network side indication according to the indication of the corresponding relation of the indication of the CCE polymerization length of each pre-configured user terminal and the information field among the described DCI or pre-configured a plurality of CCE polymerization length and the corresponding relation of the information field among the described DCI.
Wherein, described predefined search volume comprises: common search space or the search volume of indicating by described predefined RNTI.
Wherein, described polymerization length acquiring unit also is used for when not receiving the L1/L2 control signaling of the indication of carrying CCE polymerization length, and it is identical with the CCE polymerization length that gets access to by last L1/L2 control signaling to give tacit consent to current CCE polymerization length.
Wherein, also comprise:
The blind check unit is used in the exclusive search volume of user terminal, and the candidate PDCCH of the CCE polymerization length that described polymerization length acquiring unit is obtained carries out blind check.
Embodiments of the invention also provide a kind of communication system, are used for the indication of carrier aggregation system CCE polymerization length, comprising:
The base station is used to generate L1/L2 control signaling, carries the indication to the CCE polymerization length of the user terminal of current scheduling in the described L1/L2 control signaling; Described L1/L2 control signaling is sent to the user terminal of described current scheduling;
User terminal is used to receive the L1/L2 control signaling that described base station sends, and obtains CCE polymerization length according to described L1/L2 control signaling.
The embodiment of the application of the invention, control the indication of carrying in the signaling at the L1/L2 that sends to user terminal by network side to CCE polymerization length, make user terminal can know CCE polymerization length easily, thereby reduced the complexity of PDCCH blind check in the carrier aggregation system.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a schematic diagram of discontinuous carrier polymerization in the prior art;
Fig. 2 A is to the schematic diagram of the design one of the PDCCH of carrier aggregation system in the prior art;
Fig. 2 B is to the schematic diagram of the design two of the PDCCH of carrier aggregation system in the prior art;
Fig. 3 is by increasing the schematic diagram that a form indication FI indicates the DCI form that is transmitted in the prior art;
Fig. 4 is the schematic diagram that in the prior art CRC of DCI is increased mask;
Fig. 5 is the indicating means flow chart of control channel cell CCE polymerization length in the carrier aggregation system that provides in the embodiment of the invention;
Fig. 6 is the acquisition methods flow chart of control channel cell CCE polymerization length in the carrier aggregation system that provides in the embodiment of the invention;
Fig. 7 is the structural representation of the base station that provides in the embodiment of the invention;
Fig. 8 is the structural representation of the user terminal that provides in the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiments of the invention provide the indicating means of control channel cell CCE polymerization length in a kind of carrier aggregation system, as shown in Figure 5, comprising:
Step s501, generate L1/L2 control signaling, carry indication in the described L1/L2 control signaling the CCE polymerization length of the user terminal of current scheduling; This L1/L2 control signaling can be the signaling that produces by MAC layer or physical layer.
Step s502, the L1/L2 control signaling that generates is sent to the user terminal of current scheduling.
Embodiments of the invention also provide the acquisition methods of control channel cell CCE polymerization length in a kind of carrier aggregation system, as shown in Figure 6, comprising:
The L1/L2 control signaling that step s601, reception network side send is carried the indication to CCE polymerization length in this L1/L2 control signaling;
Step s602, obtain CCE polymerization length according to this L1/L2 control signaling.
The embodiment of the indicating means of CCE polymerization length in the carrier aggregation system provided by the invention is described below in conjunction with concrete application scenarios.
In the prior art, do not set up RRC (Radio Resource Control in terminal with the base station, Radio Resource control) before the connection, terminal is only monitored a member carrier in the IDLE state, and according to DCI form of the prior art PDCCH is carried out blind check.Terminal is that to the reason that PDCCH carries out blind check what terminal can't be known current DCI transmission is the information of what format, and the information of oneself need also not knowing is in which position.
The information that generally includes among the DCI comprises
UL Grant (uplink authorization)
DL Assignment (downlink resource distribution)
Paging (paging)
RACH Response (RACH response)
System Information (system information)
MIMO Downlink Assignment (distribution of MIMO downlink resource)
Power Control Command (power control command)
…
The form of information comprises format 0, format 1, format 1a, format 1b, format1c, format 1d, format 2a, format 3, format 3a etc. among the DCI, can be referring to the 3GPP document about the explanation of each format among the DCI.
Terminal knows that according to current state self is current in what information of expectation, for example:
Terminal is when the IDLE state, and the information of expectation is Paging and System Information;
After terminal is initiated Random Access, expectation be RACH Response;
Terminal when having upstream data etc. to be sent, expectation UL Grant; Or the like.
For different expectation information, terminal with corresponding RNTI go with DCI in CCE (Control Channel Elements, control channel) information is CRC (Cyclic Redundancy Check, cyclic redundancy check (CRC) code) verification, if CRC check success, UE just knows that this CCE information is oneself needs so, also knows corresponding D CI format and modulation system, thereby further solves the DCI content.Promptly so-called " blind check " process.
Consider some information such as paging, SI, RACH response are that all UE will go to monitor, and some are arranged then is with the relevant as above descending scheduling instruction of particular UE.In order to improve the blind check efficient of UE, in the prior art CCE among the DCI has been divided CCE common search space (Common Search Space) and UE particular search space (UE-Specific Search Space), in different spaces, searched for for different information.Wherein the common search space is top 16 CCE.The original position in UE particular search space is according to 3GPP TS 36.213 documents.
For the information of some format, a CCE is not enough carrying, may need a plurality of CCE in addition, so agreement stipulated so-called CCE Aggregation Level, and value is 1,2,4,8.For example have only 4,8 two kinds of values for the information A ggregation Level that is positioned in the public space.UE does not generally know use the sort of Aggregation Level, so UE need attempt all possibilities one time.For example for Common Search Space, UE needs to search for by Aggregation Level=4 and Aggregation Level=8 respectively.When pressing the AL=4 search, 16 CCE need search for 4 times, and 4 Control Channel Candidates are just arranged; When pressing the AL=8 search, 16 CCE need search for 2 times, and 2 CCH Candidates are just arranged; So for public space one total 4+2=6 CCH Candidates.For UE Specific, corresponding to Aggregation Level=1,2,4,8 have 6,6,2,2 CCH Candidates respectively, and one has 16.
In the embodiments of the invention, in order to reduce the complexity of PDCCH blind check in the carrier aggregation system, network side is at first by L1/L2 control signaling, the CCE polymerization length of informing user terminal PDCCH, thereby reduce the number of times of UE blind check PDCCH, reduce the complexity of PDCCH blind check.Concrete:
The base station is by the current CCE polymerization length that needs the user terminal of scheduling of L1/L2 control signaling indication.Concrete, in the DCI of L1/L2 control signaling, carry the indication bit information of CCE polymerization length, different indication bit information is used to identify CCE polymerization length, and this indication bit information is pre-configured according to the kind of CCE polymerization length.For example, for the situation of N kind CCE polymerization length, the number of bits of CCE polymerization Length Indication is ceil (log
2N), wherein round in the ceil () expression.For example for 4 kinds of CCE polymerization length that define among the LTE, the length of the indication bit information of CCE polymerization length is 2bit.4 kinds of CCE polymerization length with LTE are example, and the indication bit information indication of the CCE polymerization length that it is concrete is as shown in table 2.By the employed different CCE polymerization length of 00,01,10,11 expressions.The indication bit information of table 2:CCE polymerization length and the corresponding relation of CCE polymerization length
| The indication bit information of CCE polymerization length | Corresponding CCE polymerization length |
| 00 | 1 |
| 01 | 2 |
| 10 | 4 |
| 11 | 8 |
If the kind to CCE polymerization length in the LTE-A system further expands, then corresponding indication bit information is also expanded accordingly.For example, in the LTE-A system, when the kind of CCE polymerization length was the N=8 kind, the length of the indication bit information of CCE polymerization length was 3bit, by the employed different CCE polymerization length of 000,001,010,011,100,101,110,111 expressions.When the kind of CCE polymerization length was the N=5 kind, the length of the indication bit information of CCE polymerization length was similarly 3bit, by the employed different CCE polymerization length of different indication bit information representations.
In the application scenarios of the present invention, a kind of optional mode of the indicating means by L1/L2 control signaling is: the method indication of continuing to use the multicast of format3 and format 3A in the DCI form, by a predefined CCE-RNTI CRC of the DCI form of the CCE polymerization length of indicating one group of user is carried out mould 2 and add (promptly carrying out XOR), the DCI form that is used for CCE polymerization Length Indication can be put into predefined search volume simultaneously.This predefined search volume can be the common search space, or the search volume by CCE-RNTI indication.
For the bit number among the DCI that simplifies the complexity of blind check, make the indication bit information of carrying CCE polymerization length equates that with the bit number of the original DCI of system for example the bit number with DCI form 1A equates as far as possible.
Kind with the CCE polymerization length among the LTE is an example, the information field definition of the form of its DCI as shown in Table 3, wherein for a plurality of user terminals, each user terminal is high-rise configuration (for example similar to configuration mode among DCI form format3 or the format3A among the LTE R8) to the corresponding relation of information field CCE polymerization Length Indication n in the DCI form.Simultaneously, for the situation of user terminal use multicarrier, also can use a plurality of CCE polymerization Length Indication information fields to be used to refer to a plurality of CCE polymerization length of a user terminal.
Table 3: the information field of the DCI form of indication CCE polymerization length
| Information field | Bit number |
| CCE |
2 |
| CCE |
2 |
| ........... | |
| CCE polymerization |
2 |
Network side is except using above-mentioned generation L1/L2 control signaling, and outside L1/L2 controls the employed CCE polymerization of the mode informing user terminal length of the indication of carrying CCE polymerization length in the signaling, when can also not change in the CCE polymerization length that current one or more user terminals use, do not transmit the L1/L2 control signaling of the indication of carrying CCE polymerization length, promptly give tacit consent to this user terminal and adopt the last CCE polymerization length of using to carry out the transmission of PDCCH.For user terminal, when not receiving the L1/L2 control signaling of the indication of carrying CCE polymerization length, it is identical with last CCE polymerization length to give tacit consent to current CCE polymerization length, still uses the CCE polymerization length of obtaining the indication of the CCE polymerization length of carrying from last L1/L2 control signaling.
For user terminal, user terminal obtains the indication of the CCE polymerization length of PDCCH after receiving L1/L2 control signaling.Concrete, user terminal is according to bit length and the predefined CCE-RNTI of DCI, new DCI form to indication CCE polymerization length in predefined search volume carries out blind check, thereby obtains CCE polymerization length, the i.e. size of the polymerization grade of PDCCH in the exclusive search volume of UE.This predefined search volume can be the common search space, or the search volume by CCE-RNTI indication.
After UE got access to the indication of network side for CCE polymerization length, according to the indication of the CCE polymerization length of the PDCCH that obtains, the candidate PDCCH to corresponding C CE polymerization length in the exclusive search volume of UE carried out blind check.Need the number of DCI form of blind Detecting relevant under concrete blind check number of times and the residing transmission mode of current terminal and the every kind of transmission mode.
For UE, when not when network side receives the L1/L2 control signaling of the indication of carrying CCE polymerization length, it is identical with last CCE polymerization length to give tacit consent to current CCE polymerization length, still uses the CCE polymerization length of obtaining the indication of the CCE polymerization length of carrying from last L1/L2 control signaling.
The method that the embodiment of the application of the invention provides, control the indication of carrying in the signaling at the L1/L2 that sends to user terminal by network side to CCE polymerization length, make user terminal can know CCE polymerization length, thereby reduced the complexity of PDCCH blind check in the carrier aggregation system.Compare with the method for MAC CE signaling user terminal CCE polymerization length with use RRC signaling in the prior art, because the Signalling exchange flow process of using RRC signaling and MAC CE signaling to need is complicated, and L1/L2 control signaling can directly come into force after user terminal receives, and therefore can effectively reduce the notice time delay of CCE polymerization length.
Embodiments of the invention also provide a kind of communication system, are used for the indication of carrier aggregation system CCE polymerization length, comprising:
The base station is used to generate L1/L2 control signaling, carries the indication to the CCE polymerization length of the user terminal of current scheduling in this L1/L2 control signaling; This L1/L2 control signaling is sent to the user terminal of current scheduling;
User terminal is used to receive the L1/L2 control signaling that the base station sends, and obtains CCE polymerization length according to L1/L2 control signaling.
Embodiments of the invention also provide a kind of base station, are used for the indication of carrier aggregation system CCE polymerization length, as shown in Figure 7, comprising:
Control signaling generation unit 10 is used to generate L1/L2 control signaling, carries the indication to the CCE polymerization length of the user terminal of current scheduling in this L1/L2 control signaling; This control command generation unit 10 specifically is used for:
(1) will the indication of the CCE polymerization length of the user terminal of current scheduling be carried among the DCI, in order to simplify the complexity of blind check, the information bit of this DCI can be identical with the information bit of one or more other DCI such as format 1a in the system.
(2) by a predefined RNTI CRC of the Downlink Control Information DCI of the CCE polymerization length of indicating user terminal is carried out XOR.
(3) DCI is put into predefined search volume.Wherein, predefined search volume comprises: common search space or the search volume of indicating by above-mentioned predefined RNTI.
Control signaling transmitting element 20, the L1/L2 control signaling that is used for described control signaling generation unit is generated sends to the user terminal of described current scheduling.
This base station can also comprise:
Corresponding relation dispensing unit 30 is used for:
For a plurality of user terminals, the indication of the CCE polymerization length of pre-configured each user terminal and the corresponding relation of the information field among the DCI; Or
For the user terminal of multicarrier, the indication of a plurality of CCE polymerization length of pre-configured user terminal and the corresponding relation of the information field among the DCI; Or
When the CCE of current one or more user terminals polymerization length does not change, do not transmit the L1/L2 control signaling of the indication of carrying CCE polymerization length, adopt the last CCE polymerization length of using to carry out the transmission of PDCCH; When described user terminal did not receive the L1/L2 control signaling of the indication of carrying CCE polymerization length, it was identical with last CCE polymerization length to give tacit consent to current CCE polymerization length.
Embodiments of the invention also provide a kind of user terminal, as shown in Figure 8, comprising:
Control signaling receiving element 50 is used to receive the L1/L2 control signaling that network side sends, and carries the indication to CCE polymerization length in this L1/L2 control signaling;
Polymerization length acquiring unit 60 is used for obtaining CCE polymerization length according to the L1/L2 control signaling that control signaling receiving element 50 receives.This polymerization length acquiring unit 60 specifically is used for:
(1) obtains the Downlink Control Information DCI that carries in the L1/L2 control signaling of control signaling receiving element 50 receptions; In order to simplify the complexity of blind check, the information bit of this DCI can system in the information bit of one or more other DCI such as format 1a identical.
(2) according to bit length and the predefined RNTI of DCI, DCI to indication CCE polymerization length in predefined search volume carries out blind check, and, obtain the CCE polymerization length of network side indication according to the indication of the corresponding relation of the indication of the CCE polymerization length of each pre-configured user terminal and the information field among the DCI or pre-configured a plurality of CCE polymerization length and the corresponding relation of the information field among the DCI.Predefined search volume comprises: common search space or the search volume of indicating by described predefined RNTI.
Polymerization length acquiring unit 60 can also be used for: when not receiving the L1/L2 control signaling of the indication of carrying CCE polymerization length, it is identical with the CCE polymerization length that gets access to by last L1/L2 control signaling to give tacit consent to current CCE polymerization length.
This user terminal can also comprise:
System that the embodiment of the application of the invention provides and equipment, control the indication of carrying in the signaling at the L1/L2 that sends to user terminal by network side to CCE polymerization length, make user terminal can know CCE polymerization length, thereby reduced the complexity of PDCCH blind check in the carrier aggregation system.Compare with the method for MAC CE signaling user terminal CCE polymerization length with use RRC signaling in the prior art, because the Signalling exchange flow process of using RRC signaling and MAC CE signaling to need is complicated, and L1/L2 control signaling can directly come into force after user terminal receives, and therefore can effectively reduce the notice time delay of CCE polymerization length.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, unit in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the unit in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.A unit can be merged in the unit of the foregoing description, also can further split into a plurality of subelements.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
Claims (21)
1. the indicating means of control channel cell CCE polymerization length in the carrier aggregation system is characterized in that, comprising:
Generate L1/L2 control signaling, carry indication in the described L1/L2 control signaling the CCE polymerization length of the user terminal of current scheduling;
Described L1/L2 control signaling is sent to the user terminal of described current scheduling.
2. the method for claim 1 is characterized in that, described generation L1/L2 control signaling is carried the indication to the CCE polymerization length of the user terminal of current scheduling in the described L1/L2 control signaling, comprising:
The indication of the CCE polymerization length of described user terminal to current scheduling is carried among the Downlink Control Information DCI, the CRC of the Downlink Control Information DCI of the CCE polymerization length of indicating user terminal is carried out XOR by a predefined RNTI; Described DCI is put into predefined search volume.
3. method as claimed in claim 2 is characterized in that, the described information bit that carries the DCI of the indication of the CCE polymerization length of the user terminal of current scheduling is identical with the information bit of one or more other DCI in the system.
4. method as claimed in claim 2 is characterized in that, described predefined search volume comprises: common search space or the search volume of indicating by described predefined RNTI.
5. method as claimed in claim 1 or 2 is characterized in that, also comprises:
For a plurality of user terminals, the indication of the CCE polymerization length of pre-configured each user terminal and the corresponding relation of the information field among the described DCI; Or
For the user terminal of multicarrier, the indication of a plurality of CCE polymerization length of pre-configured described user terminal and the corresponding relation of the information field among the described DCI; Or
When the CCE of current one or more user terminals polymerization length does not change, do not transmit the L1/L2 control signaling of the indication of carrying CCE polymerization length, adopt the last CCE polymerization length of using to carry out the transmission of PDCCH; When relevant user terminals did not receive the L1/L2 control signaling of the indication of carrying CCE polymerization length, it was identical with last CCE polymerization length to give tacit consent to current CCE polymerization length.
6. the acquisition methods of control channel cell CCE polymerization length in the carrier aggregation system is characterized in that, comprising:
Receive the L1/L2 control signaling that network side sends, carry indication in the described L1/L2 control signaling CCE polymerization length;
Obtain CCE polymerization length according to described L1/L2 control signaling.
7. method as claimed in claim 6 is characterized in that, describedly obtains CCE polymerization length according to described L1/L2 control signaling and comprises:
Obtain the Downlink Control Information DCI that carries in the described L1/L2 control signaling;
Bit length and predefined RNTI according to described DCI, DCI to indication CCE polymerization length in predefined search volume carries out blind check, and, obtain the CCE polymerization length of network side indication according to the indication of the corresponding relation of the indication of the CCE polymerization length of each pre-configured user terminal and the information field among the described DCI or pre-configured a plurality of CCE polymerization length and the corresponding relation of the information field among the described DCI.
8. method as claimed in claim 6 is characterized in that, described predefined search volume comprises: common search space or the search volume of indicating by described predefined RNTI.
9. method as claimed in claim 6 is characterized in that, also comprises:
When described user terminal did not receive the L1/L2 control signaling of the indication of carrying CCE polymerization length, it was identical with the CCE polymerization length that gets access to by last L1/L2 control signaling to give tacit consent to current CCE polymerization length.
10. as each described method in the claim 6 to 9, it is characterized in that, also comprise:
In the exclusive search volume of user terminal, the candidate PDCCH of described CCE polymerization length is carried out blind check.
11. a base station is characterized in that, is used for the indication of carrier aggregation system CCE polymerization length, it is characterized in that, comprising:
Control signaling generation unit is used to generate L1/L2 control signaling, carries the indication to the CCE polymerization length of the user terminal of current scheduling in the described L1/L2 control signaling;
Control signaling transmitting element, the L1/L2 control signaling that is used for described control signaling generation unit is generated sends to the user terminal of described current scheduling.
12. base station as claimed in claim 11 is characterized in that, described control command generation unit specifically is used for:
The indication of the CCE polymerization length of described user terminal to current scheduling is carried among the DCI, the CRC of the Downlink Control Information DCI of the CCE polymerization length of indicating user terminal is carried out XOR by a predefined RNTI; Described DCI is put into predefined search volume.
13. base station as claimed in claim 11 is characterized in that, the described information bit that carries the DCI of the indication of the CCE polymerization length of the user terminal of current scheduling is identical with the information bit of one or more other DCI in the system.
14. base station as claimed in claim 11 is characterized in that, described predefined search volume comprises: common search space or the search volume of indicating by described predefined RNTI.
15. as claim 11 or 12 described base stations,, it is characterized in that also comprise: the corresponding relation dispensing unit is used for:
For a plurality of user terminals, the indication of the CCE polymerization length of pre-configured each user terminal and the corresponding relation of the information field among the described DCI; Or
For the user terminal of multicarrier, the indication of a plurality of CCE polymerization length of pre-configured described user terminal and the corresponding relation of the information field among the described DCI; Or
When the CCE of current one or more user terminals polymerization length does not change, do not transmit the L1/L2 control signaling of the indication of carrying CCE polymerization length, adopt the last CCE polymerization length of using to carry out the transmission of PDCCH; When described user terminal did not receive the L1/L2 control signaling of the indication of carrying CCE polymerization length, it was identical with last CCE polymerization length to give tacit consent to current CCE polymerization length.
16. a user terminal is characterized in that, comprising:
Control signaling receiving element is used to receive the L1/L2 control signaling that network side sends, and carries the indication to CCE polymerization length in the described L1/L2 control signaling;
Polymerization length acquiring unit, the L1/L2 control signaling that is used for receiving according to described control signaling receiving element is obtained CCE polymerization length.
17. user terminal as claimed in claim 16 is characterized in that, described polymerization length acquiring unit specifically is used for:
Obtain the Downlink Control Information DCI that carries in the described L1/L2 control signaling;
Bit length and predefined RNTI according to described DCI, DCI to indication CCE polymerization length in predefined search volume carries out blind check, and, obtain the CCE polymerization length of network side indication according to the indication of the corresponding relation of the indication of the CCE polymerization length of each pre-configured user terminal and the information field among the described DCI or pre-configured a plurality of CCE polymerization length and the corresponding relation of the information field among the described DCI.
18. user terminal as claimed in claim 17 is characterized in that, described predefined search volume comprises: common search space or the search volume of indicating by described predefined RNTI.
19. user terminal as claimed in claim 16, it is characterized in that, described polymerization length acquiring unit, also be used for when not receiving the L1/L2 control signaling of the indication of carrying CCE polymerization length, it is identical with the CCE polymerization length that gets access to by last L1/L2 control signaling to give tacit consent to current CCE polymerization length.
20. as each described user terminal in the claim 16 to 19, it is characterized in that, also comprise:
The blind check unit is used in the exclusive search volume of user terminal, and the candidate PDCCH of the CCE polymerization length that described polymerization length acquiring unit is obtained carries out blind check.
21. a communication system is used for the indication of carrier aggregation system CCE polymerization length, it is characterized in that, comprising:
The base station is used to generate L1/L2 control signaling, carries the indication to the CCE polymerization length of the user terminal of current scheduling in the described L1/L2 control signaling; Described L1/L2 control signaling is sent to the user terminal of described current scheduling;
User terminal is used to receive the L1/L2 control signaling that described base station sends, and obtains CCE polymerization length according to described L1/L2 control signaling.
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