CN102957497A - Method and equipment for sending and blind detection of physical downlink control channel - Google Patents
Method and equipment for sending and blind detection of physical downlink control channel Download PDFInfo
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- CN102957497A CN102957497A CN2011102399845A CN201110239984A CN102957497A CN 102957497 A CN102957497 A CN 102957497A CN 2011102399845 A CN2011102399845 A CN 2011102399845A CN 201110239984 A CN201110239984 A CN 201110239984A CN 102957497 A CN102957497 A CN 102957497A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
An embodiment of the invention discloses a method and equipment for sending and blind detection of a physical downlink control channel, and belongs to the technical field of communication. The blind detection method includes that UE (unified equipment) only performs blind detection to one control channel of the physical downlink control channel (PDCCH) and an enhanced physical downlink control channel (ePDCCH) in one subframe to obtain scheduling information of the UE, and the UE communicates with a base station based on the scheduling information. By adopting the technical scheme, complexity of the blind detection of the UE is lowered, so that power consumption of the UE is reduced.
Description
Technical field
The embodiment of the invention relates to communication technical field, relates in particular to a kind of Physical Downlink Control Channel transmission and blind checking method, equipment.
Background technology
At Long Term Evolution (Long Term Evolution, LTE) in the communication system, Physical Downlink Control Channel (Physical Downlink Control Channel, PDCCH) be generally used for sending Downlink Control Information (Downlink Control information, DCI).A plurality of user's equipment (User Equipment, UE) in residential quarter can the dynamic multiplexing running time-frequency resource, and the running time-frequency resource that one of them UE takies is indicated by PDCCH corresponding to this UE.Usually a subframe on the time domain contains 14 OFDM symbols (OFDM Symbol) altogether, and the duration of this subframe is 1ms.PDCCH generally is arranged in front 1 to 3 OFDM Symbol of a subframe, be used to indicate Physical Downlink Shared Channel (the Physical Downlink Shared Channel of each UE in current subframe, the information of PDSCH) and other signaling, distributing as being used for ascending resource.
UE normally intercepts the PDCCH information that obtains in the PDCCH resource.Because the PDCCH resource that each UE need to intercept is dynamic change, therefore UE and unclear this variation will be adopted multiple possible form to carry out PDCCH and intercept, namely carry out the PDCCH blind Detecting.Each UE need to carry out the most nearly that 44 times PDCCH blind Detecting obtains the PDCCH information of corresponding this UE, thereby obtains the schedule information of corresponding this UE by described PDCCH information, such as the schedule information of the PDSCH of this UE and the schedule information of other signaling.In blind Detecting, the search volume at PDCCH place is divided into two large classes, i.e. public search space CSS and dedicated search space DSS two classes.In above-mentioned two search volumes, carry out blind Detecting and all may cause larger PDCCH blind Detecting operand.At first, PDCCH has nearly 10 multiple formats, is called the DCI form, and wherein the raw information length of some DCI form is identical, such as form 0, and 1A, the raw information length of 3,3A is identical, and these four kinds of forms just can detect with a Viterbi Viterbi decoding.The raw information length of some form is then different, and at this moment UE just need to carry out the information that repeatedly Viterbi decoding just can detect needs.And for the PDCCH in the DSS space, length behind four kinds of possible codings is arranged at most, be respectively 1,2,4,8 control channel elements (CCE), as shown in Figure 1.These length are the corresponding different grade AL that converges respectively.And for CSS, length only has these two kinds possibilities of 4 and 8 CCE behind the coding.UE need to carry out respectively Viterbi decoding by these length.Under length behind every kind of coding, the original position of PDCCH may have a plurality of, and as shown in Figure 1, UE needs to decipher to detect as Viterbi for the data of these positions respectively.In Fig. 1, for the specific space of UE, i.e. DSS, when message length was a CCE behind the coding, the corresponding CCE number that can place PDCCH was 6, the PDCCH position may have 6 kinds; For public space, i.e. CSS, when message length was 4 CCE behind the coding, the corresponding CCE number that can place PDCCH was 16, the PDCCH position may have 4 kinds.After classifying according to different DCI forms, the needed blind Detecting number of times of different DCI Format Types as shown in Figure 2.Under extreme case, need to carry out at most all possible configuration that 44 times Viterbi decoding just can detect PDCCH.
Because channel condition can change, the DCI form that use UE and base station also can change, and in order to realize the switching of DCI form, prior art has been introduced a kind of fall-back mode, under this pattern, UE also needs to detect another kind of extra DCI form except detecting current DCI form.For example in a subframe, when UE carries out the PDCCH blind Detecting, generally need to carry out blind Detecting for two kinds of possible DCI forms that are used to indicate the downlink configuration, one is DCI form corresponding to current sending mode (Tx mode), and one is DCI form corresponding to fall-back mode.When the channel condition of UE changed, Txmode also should carry out respective change, the pattern that sends PDCCH this moment need can be level and smooth be transitioned into again new Tx mode by former Txmode through fall-back mode.As shown in Figure 3, before switching generation, suppose that the current sending mode that current UE is in is Tx mode 4, the base station adopts the DCI form 2 of Tx mode 4 correspondences to carry out the transmission of Downlink Control Information.Then UE is when carrying out the PDCCH blind Detecting, this UE can carry out blind Detecting for two kinds of DCI forms that are used to indicate the downlink configuration, one is the DCI form 2 of Tx mode 4 correspondences, another is DCI form 1A corresponding to fall-back mode, and when adopting DCI form 2 to detect the controlled information of success.When channel changes, the DCI form switches generation, need this moment current sending mode is switched to Tx mode 7, the base station switches to form DCI_1A from the form DCI_2 of Tx Mode 4 correspondences first, be that the base station can use the DCI_1A form to send Downlink Control Information in transition stage, UE this moment still use DCI form 2 and two kinds of forms of DCI form 1A to do blind Detecting, and when adopting DCI form 1A to detect the controlled information of success.The base station is used high-level signaling notice UE sending mode and is switched to Tx mode 7 in switching, and UE carries out switching after receiving this high-level signaling.After switching was finished, UE used form DCI_1 and the form DCI_1A corresponding to fall-back mode of Tx mode 7 correspondences to carry out blind Detecting, and the base station then uses the DCI_1 form of Tx mode 7 correspondences to issue control information.By introducing fall-back mode, prior art can be finished taking over seamlessly of sending mode.
In the scenes such as multipoint cooperative communication CoMP and multi-user's multiple-input and multiple-output MU-MIMO enhancing, the capacity of PDCCH becomes the bottleneck that the restriction system throughput improves.For further strengthening the capacity of PDCCH, prior art has proposed a kind of scheme that the PDCCH channel is strengthened, in this scheme, expand by sending newly-increased PDCCH in the resource that originally belongs to PDSCH, the PDCCH channel that newly increases is called and strengthens Physical Downlink Control Channel (ePDCCH).Figure 4 shows that the example of a kind of newly-increased ePDCCH, ePDCCH takies a part of resource of former PDSCH, takies resource take Resource Block RB as base unit, adopts the mode of frequency division multiplexing to work between ePDCCH and the PDSCH.Similar with PDSCH, ePDCCH adopts the demodulation such as demodulated reference signal DMRS, to improve the performance of ePDCCH, improves the capacity of ePDCCH.By this expansion, the resource of the PDCCH that the base station can be used will increase to some extent, thereby so that the capacity of PDCCH has obtained expansion.
After system introduced ePDCCH, the base station can send schedule information to one or more UE in ePDCCH and these two control channels of PDCCH, thereby had expanded the resource of base station down control channel.But the blind Detecting operand of this UE also can increase thereupon.Because a UE is also needing among the ePDCCH as carry out blind Detecting for the DCI form of two kinds of possible downlink configurations among the PDCCH, therefore the channel after this expansion to down control channel can cause this UE to expansion carries out more blind Detecting, and the increase of this blind Detecting operand can improve the power consumption of UE.
Summary of the invention
The embodiment of the invention provides a kind of Physical Downlink Control Channel transmission and blind checking method, equipment, with in the situation that the down control channel capacity extension reduces the complexity of blind Detecting.
According to one embodiment of the invention, a kind of physical downlink control channel PDCCH blind checking method is provided, comprising:
User equipment (UE) only carries out blind Detecting to obtain the schedule information of described UE to a control channel among physical downlink control channel PDCCH and the enhancing Physical Downlink Control Channel ePDCCH in a subframe;
Described UE communicates based on described schedule information and base station.
According to another embodiment of the present invention, provide a kind of physical downlink control channel PDCCH sending method, comprising:
Generate the schedule information of user equipment (UE);
In a subframe, only on a control channel among physical downlink control channel PDCCH and the enhancing Physical Downlink Control Channel ePDCCH, send described schedule information to described UE.
According to another embodiment of the present invention, provide a kind of subscriber equipment, comprising:
The blind Detecting unit is used for only a control channel among physical downlink control channel PDCCH and the enhancing Physical Downlink Control Channel ePDCCH being carried out blind Detecting to obtain the schedule information of described UE a subframe;
Communication unit is used for communicating based on described schedule information and base station.
According to another embodiment of the present invention, provide a kind of base station, comprising:
Generation unit is for the schedule information that generates user equipment (UE);
Transmitting element is used for only sending described schedule information to described UE on a control channel among physical downlink control channel PDCCH and the enhancing Physical Downlink Control Channel ePDCCH a subframe.
According to the description to technique scheme, the embodiment of the invention has the following advantages: the base station only sends schedule information to a UE on the control channel in PDCCH and ePDCCH in a subframe, so that described UE can only carry out blind Detecting at a described control channel, the complexity of UE blind Detecting can be reduced, and can save the power consumption of UE.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the below will do to introduce simply to the accompanying drawing that embodiment need to use, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram that a kind of UE needs the PDCCH position candidate situation of blind Detecting;
Fig. 2 is a kind of schematic diagram that carries out blind Detecting classification and every type of required blind Detecting quantity for the DCI form;
Fig. 3 is that a kind of channel condition sends the schematic diagram that the DCI form of PDCCH control information switches when changing;
Fig. 4 is a kind of schematic diagram of PDCCH design;
The schematic diagram of a kind of PDCCH blind checking method that Fig. 5 provides for the embodiment of the invention;
The schematic diagram of a kind of PDCCH sending method that Fig. 6 provides for the embodiment of the invention;
The structural representation of a kind of subscriber equipment 70 that Fig. 7 provides for the embodiment of the invention;
The structural representation of a kind of base station 80 that Fig. 8 provides for 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 the present invention's part embodiment, 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 obtains under the creative work prerequisite.
The schematic diagram of a kind of PDCCH blind checking method that Fig. 5 provides for the embodiment of the invention, the method comprises:
S51:UE only carries out blind Detecting to obtain the schedule information of described UE to a control channel among PDCCH and the ePDCCH in a subframe;
S52: described UE communicates based on described schedule information and base station.Described schedule information can be the control information except user face data.This control information can be used for assisting control UE behavior, so that UE can realize communicating by letter based on this control information and base station.The present embodiment does not limit the kind of described schedule information.For example, described schedule information can be used for to the running time-frequency resource of described UE indicating downlink use, described UE can communicate with the base station on the running time-frequency resource of described schedule information indication, as described in running time-frequency resource receive from as described in out of Memory or the data of base station.
In embodiments of the present invention, blind Detecting for a described control channel can be selected as PDCCH or ePDCCH.UE can realize by the indication of base station described selection.For example, alternatively, before S51, this method also can comprise S50: receive the notice signaling from described base station, described notice signaling is used for notice UE only to carrying out blind Detecting on the described control channel.Alternatively, UE only carries out blind Detecting to a described control channel also according to preset configuration in a subframe.For example, described preset configuration can be stipulated by communication protocol, also can be inner at UE by system manufacturer or equipment manufacturer configures, also can be configured in UE inside by service provider, thereby so that UE need not through the notice of base station or triggers the method that can carry out the present embodiment, reach the purpose that reduces the blind Detecting complexity.
Because UE only does blind Detecting to one of them of PDCCH and ePDCCH, even if on the basis of introducing the control channel capacity that the ePDCCH extended base station can use, the complexity of the blind Detecting of UE can significantly not improve, and can save the power consumption of UE.
Corresponding with above-described embodiment, the schematic diagram of a kind of PDCCH sending method that Fig. 6 provides for the embodiment of the invention, the method comprises:
S61: the schedule information that generates UE;
S62: in a subframe, only on a control channel among PDCCH and the ePDCCH, send described schedule information to described UE.Described schedule information can be the control information except user face data.This control information can be used for assisting control UE behavior.For example, described schedule information can be used for to the running time-frequency resource of described UE indicating downlink use, and the present embodiment does not limit the concrete kind of schedule information.A described control channel can be selected as PDCCH or ePDCCH.This selection can realize by the indication signaling of base station.For example, before S61, this method also can comprise S60: the base station can send notice signaling to described UE, and described notice signaling is used to indicate described UE and only a described control channel is carried out blind Detecting.Certainly, aforesaid operations can not triggered by signaling in the base station yet, and automatically performs described operation by UE and base station according to preset configuration.Above-mentioned configuration can arrange by the communication protocol regulation or by goods producer or operator, and the present embodiment does not limit this.
The structural representation of a kind of subscriber equipment 70 that Fig. 7 provides for the embodiment of the invention comprises:
Detecting unit 71 is used for only a control channel among PDCCH and the ePDCCH being carried out blind Detecting to obtain the schedule information of described UE a subframe;
Communication unit 72 is used for communicating based on described schedule information and base station.
In a kind of concrete application, described detecting unit 71 can be a processor, is used for obtaining schedule information by blind Detecting.Described communication unit 72 can be a port, is used for for example receiving out of Memory or data from described base station based on described schedule information and base station executive communication operation.The described user equipment (UE) of mentioning in the present embodiment can include but not limited to all kinds of terminal equipments such as mobile phone, kneetop computer and panel computer.Further, described subscriber equipment 70 can comprise: receiving element 73 is used for receiving the notice signaling from described base station; Then described detecting unit 71 only carries out blind Detecting to a described control channel based on described notice signaling in a subframe.Certainly under another kind of application scenarios, receiving element 73 can not exist.Described blind Detecting unit 71 can only carry out blind Detecting to a described control channel according to preset configuration in a subframe at this moment, and need not the triggering of other unit.
The structural representation of a kind of base station 80 that Fig. 8 provides for the embodiment of the invention comprises:
Transmitting element 82 is used for only sending described schedule information to described UE on a control channel among PDCCH and the ePDCCH a subframe.
Can be referring to embodiment of the method about subscriber equipment 70 and base station 80 more behaviors.The UE of the embodiment of the invention and base station can only with a transmission that realizes down dispatch information in two parts control channel in a subframe, reduce the blind Detecting complexity of UE.Certainly, base station or UE both sides can all carry out described operation in a plurality of subframes.For example, the base station can be in all subframes, and namely all on time domain all only send schedule information to a UE with a control channel among PDCCH and the ePDCCH constantly.Corresponding, described UE can in described all subframes, all only do blind Detecting to the described control channel among PDCCH and the ePDCCH.
For described base station, when it served a plurality of UE, through the expansion of ePDCCH, the control channel capacity that can use promoted to some extent.For among described a plurality of UE some, the base station can use PDCCH to dispatch.For other UE, ePDCCH can be used in the base station.But the base station can not send schedule information to single UE simultaneously on PDCCH and ePDCCH.For this single UE, it can not do blind Detecting at two parts control channel, so that the blind Detecting complexity of each UE can both be reduced, thereby reduces power consumption and the false-alarm that is caused by blind Detecting.Certainly, the method that the present embodiment provides can combine with prior art, and for example, when a plurality of UE was served in the base station, wherein part UE can adopt the method that the embodiment of the invention adopts, and namely only in PDCCH and ePDCCH does blind Detecting.A part of UE can adopt the method for prior art to carry out blind Detecting in addition, namely detects PDCCH and ePDCCH.Which UE carries out and can be determined or be determined based on the notice of base station by preset configuration with reference to the scheme of the present embodiment.In the situation of or power limited limited when the blind Detecting number of times of a UE, this UE can carry out with reference to the method that the present embodiment provides.
One of ordinary skill in the art will appreciate that all or part of flow process among the said method embodiment, can come the instruction related hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process such as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
The above only is several embodiments of the present invention, and those skilled in the art can carry out various changes or modification to the present invention according to the disclosed content of application documents and not break away from the spirit and scope of the present invention.One of ordinary skill in the art will appreciate that between described embodiment or between the feature of different embodiment in the situation that do not clash to interosculate and form new embodiment.
Claims (12)
1. a physical downlink control channel PDCCH blind checking method is characterized in that, comprising:
User equipment (UE) only carries out blind Detecting to obtain the schedule information of described UE to a control channel among physical downlink control channel PDCCH and the enhancing Physical Downlink Control Channel ePDCCH in a subframe;
Described UE communicates based on described schedule information and base station.
2. the method for claim 1 is characterized in that, also comprises: receive the notice signaling from described base station;
Described UE only carries out blind Detecting to a described control channel and comprises in a subframe:
Described UE only carries out blind Detecting to a described control channel based on described notice signaling in a subframe.
3. the method for claim 1 is characterized in that, described UE only carries out blind Detecting to a described control channel and comprises in a subframe:
Described UE only carries out blind Detecting to a described control channel according to preset configuration in a subframe.
4. a physical downlink control channel PDCCH sending method is characterized in that, comprising:
Generate the schedule information of user equipment (UE);
In a subframe, only on a control channel among physical downlink control channel PDCCH and the enhancing Physical Downlink Control Channel ePDCCH, send described schedule information to described UE.
5. method as claimed in claim 4 is characterized in that, also comprises:
Send notice signaling to described UE, described notice signaling is used to indicate described UE and only a described control channel is carried out blind Detecting.
6. method as claimed in claim 4 is characterized in that, describedly only sends described schedule information to described UE on a described control channel comprise in a subframe:
According to preset configuration, in a subframe, only on a described control channel, send described schedule information to described UE.
7. a user equipment (UE) is characterized in that, comprising:
The blind Detecting unit is used for only a control channel among physical downlink control channel PDCCH and the enhancing Physical Downlink Control Channel ePDCCH being carried out blind Detecting to obtain the schedule information of described UE a subframe;
Communication unit is used for communicating based on described schedule information and base station.
8. UE as claimed in claim 7 is characterized in that, also comprises:
Receiving element is used for receiving the notice signaling from described base station;
Then described blind Detecting unit is used for based on described notice signaling, only a described control channel is carried out blind Detecting in a subframe.
9. UE as claimed in claim 7 is characterized in that, described blind Detecting unit is used for according to preset configuration, only a described control channel is carried out blind Detecting in a subframe.
10. a base station is characterized in that, comprising:
Generation unit is for the schedule information that generates user equipment (UE);
Transmitting element is used for only sending described schedule information to described UE on a control channel among physical downlink control channel PDCCH and the enhancing Physical Downlink Control Channel ePDCCH a subframe.
11. base station as claimed in claim 10 is characterized in that, also comprises: notification unit, be used for sending notice signaling to described UE, described notice signaling is used to indicate described UE and only a described control channel is carried out blind Detecting.
12. base station as claimed in claim 10 is characterized in that, described transmitting element is used for according to preset configuration, only sends described schedule information to described UE on a described control channel in a subframe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102399845A CN102957497A (en) | 2011-08-19 | 2011-08-19 | Method and equipment for sending and blind detection of physical downlink control channel |
| PCT/CN2012/079293 WO2013026345A1 (en) | 2011-08-19 | 2012-07-27 | Sending and blind detection method and device for physical downlink control channel |
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| CN2011102399845A CN102957497A (en) | 2011-08-19 | 2011-08-19 | Method and equipment for sending and blind detection of physical downlink control channel |
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| WO (1) | WO2013026345A1 (en) |
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| CN108632789A (en) * | 2017-03-24 | 2018-10-09 | 中兴通讯股份有限公司 | Transmission method, device, base station and the user equipment of down control channel |
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| EP3031264B1 (en) | 2013-08-07 | 2018-12-26 | Sun Patent Trust | Base station apparatus, terminal apparatus, transmitting method, and receiving method |
| US10420089B2 (en) | 2017-08-10 | 2019-09-17 | At&T Intellectual Property I, L.P. | Adaptive two-stage downlink control channel structure for code block group based fifth generation (5G) or other next generation systems |
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| US8363593B2 (en) * | 2002-11-06 | 2013-01-29 | Alcatel Lucent | Method for carrying downlink control information for an enhanced uplink dedicated channel |
| CN101925111A (en) * | 2009-06-16 | 2010-12-22 | 中兴通讯股份有限公司 | Method and device for determining scheduling strategy |
| CN101699901B (en) * | 2009-09-28 | 2012-08-08 | 上海华为技术有限公司 | Method and device for optimizing search space of user equipment |
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| WO2009086859A1 (en) * | 2008-01-05 | 2009-07-16 | Panasonic Corporation | Control channel signaling using code points for indicating the scheduling mode |
| CN101877621A (en) * | 2009-04-30 | 2010-11-03 | 三星电子株式会社 | Sending method and sending device used for physical downlink control channel (PDCCH) in LTE-A system |
| CN102035807A (en) * | 2009-09-30 | 2011-04-27 | 中兴通讯股份有限公司 | Method and system for transmitting multimedia broadcast multicast service notice information |
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