CN107046713A

CN107046713A - The determination method and device of down control channel, terminal, base station

Info

Publication number: CN107046713A
Application number: CN201610082245.2A
Authority: CN
Inventors: 石靖; 夏树强; 张雯; 韩祥辉; 任敏; 张文峰
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-02-05
Filing date: 2016-02-05
Publication date: 2017-08-15
Anticipated expiration: 2036-02-05
Also published as: WO2017133340A1; CN107046713B

Abstract

The invention provides a kind of determination method and device of down control channel, terminal, base station, wherein, the determination method of the down control channel includes：Terminal receives the down control channel of bearing downlink control information in short TTI, wherein, down control channel is located at the first control area or the second control area, when down control channel is located at the first control area, Candidate Set quantity of the down control channel in short TTI is less than or equal to the Candidate Set quantity of subframe in LTE, or each the short TTI Candidate Set quantity sum that is included in X subframe of down control channel is less than or equal to the Candidate Set quantity of X subframe in LTE, wherein X is positive integer, when down control channel is located at the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1.The technical scheme provided using the present invention, low time delay demand can not be supported well by solving existing down control channel.

Description

The determination method and device of down control channel, terminal, base station

Technical field

The present invention relates to the communications field, in particular to the determination method and device, terminal, base of a kind of down control channel Stand.

Background technology

As forth generation mobile communication technology (4G, the 4th Generation mobile communication technology) is long-term Evolution (LTE, Long-Term Evolution)/senior long term evolution (LTE-Advance/LTE-A, Long-Term Evolution Advance) system commercialization is increasingly perfect, is the 5th third-generation mobile communication technology (5G, the 5th to next generation mobile communication technology Generation mobile communication technology) technical requirement also more and more higher.In the industry it is believed that under One Generation Mobile Communication System should have the features such as superelevation speed, ultra-high capacity, ultrahigh reliability and ultralow delay transport characteristic. Index for ultralow time delay in the 5G systems order of magnitude for the time delay about 1ms that eats dishes without rice or wine generally acknowledged at present.

In correlation technique, exist a kind of method for realizing ultralow time delay be by reduce the transmission time interval of LTE system (TTI, Transmission Time Interval), fully shorten processing delay unit, to support above-mentioned 1ms to eat dishes without rice or wine the property requirements of time delay. The method that presently, there are two kinds of diminution TTI, one kind is by expanding OFDM (OFDM, Orthogonal Frequency Division Multiplexing) subcarrier spacing of system reduces the duration of single OFDM symbol, height of this method in 5G Related in frequency communication system and super-intensive network；Another method is current third generation partner program (3rd Generation Partnership Project, 3GPP) discussed reduce TTI length by reducing the quantity of OFDM symbol in single TTI, The benefit of this method is can be completely compatible with existing LTE system.

Down control channel (PDCCH, Physical Downlink Control Channel) takes system in existing LTE system The resource area of 0-4 OFDM symbol before in bandwidth, enhancing down control channel (EPDCCH, Enhanced Physical Downlink Control Channel) use downstream data traffic channel (PDSCH, Physical Downlink Shared Channel) Middle part PRB resource areas.Relative to the subframe of existing 1ms TTI length, the shortening TTI containing less OFDM symbol As a kind of TTI of new granularity, existing down control channel can not support new granularity TTI well.

For in correlation technique, the problem of existing down control channel can not support low time delay demand well not yet proposes have The solution of effect.

The content of the invention

In order to solve the above-mentioned technical problem, the embodiments of the invention provide a kind of determination method and device of down control channel, end End, base station.

According to an aspect of the invention, there is provided a kind of determination method of down control channel, including：

Terminal receives the down control channel of bearing downlink control information in short transmission time interval TTI, wherein, the descending control Channel processed is located at the first control area or the second control area, when the down control channel is located at first control area, Candidate Set quantity of the down control channel in short TTI is less than or equal to the Candidate Set of subframe in long evolving system LTE Quantity, or each the short TTI Candidate Set quantity sum that the down control channel is included in X subframe are less than or equal to The Candidate Set quantity of X subframe in LTE, wherein X is positive integer, when the down control channel is located at the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1.

Further, the terminal is received in short transmission time interval TTI before the down control channel of bearing downlink control information, Methods described also includes：

The down control channel of the control area detection carrying Downlink Control Information in short TTI, wherein, the control zone Domain includes at least one of：Contain multiple candidate bits in first control area, the second control area, first control area Put, described secondControlOnly containing a position candidate in region.

Further, the down control channel of bearing downlink control information is detected in the control area in short TTI, including：

By detecting that multiple position candidates receive the down control channel in first control area；Or

The position candidate determined in second control area by detecting receives the down control channel.

Further, the down control channel of the control area detection carrying Downlink Control Information in short TTI, including：

Detected in all short TTI control area；Or

Detected in the short TTI in part control area, wherein, the short TTI in the part is determined in the following manner：Pass through base station Configuration determines the short TTI in part, wherein, the configuration signal configured by base station includes at least one of：System message Block SIB, radio resource control RRC, Downlink Control Information DCI；Preset the short TTI in the part；According to cell ID ID Or the implicit short TTI for determining detection of terminal iidentification UE ID or Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI.

Further, methods described also includes：

When being detected in the second control area, short PDCCH positions in short TTI test position and short TTI by least through with One of under type is determined：Determined by UE ID or C-RNTI；Indicate that DCI or RRC is indicated by descending control.

Further, when being indicated using DCI, indicated by the first order in the DCI two-stages, wherein, institute Stating the first order includes：Publicly-owned or unchanged signaling bit domain, and second level DCI test position, the first order DCI Positioned at the first control area, the second level DCI is located at the second control area.

Further, the first order DCI is located in the first short TTI in one group of short TTI, and the second level DCI is according to the One-level DCI determines that second level DCI is located at wherein one or more short TTI in one group of short TTI.

Further, the control area takes short TTI resources at least through one of in the following manner：

The control area is time-multiplexed with short Physical Downlink Shared Channel PDSCH, and takes X independent OFDM OFDM symbol, wherein, short TTI includes N number of OFDM symbol, and X and N are positive integer, and X is less than or equal to N；

The control area takes the part resource of X OFDM symbol, wherein, take OFDM symbol part resource position It is determined by the configuration signal being pre-configured with or base station is issued, the configuration signal includes：High-level signaling System information block SIB Or short control format indicates SCFI information in physical layer signaling；

The control area and short Physical Downlink Shared Channel PDSCH frequency division multiplexings, and take the short Physical Resource Block PRB in part Resource；Wherein, take the short PRB resource locations in part be pre-configured with or configuration signal that base station is issued by way of determine, match somebody with somebody Confidence order includes at least one of：The proprietary signaling radio resource control RRC of publicly-owned signaling SIB, UE of cell.

Further, the control area takes the part resource of X OFDM symbol, including：

Part frequency domain resource is taken according to specified order to one of at least following frequency domain resource：Short PRB, XPRB, resource block group RBG, wherein, the specified order includes：Taken since the appointed sequence number of the frequency domain resource to the frequency domain resource sequence of configuration Number, the XPRB is, with PRB composition XPRB M short, M is positive integer in short TTI；

One is selected in predefined S resource area by base station, and the resource area selected is configured to the control Region, wherein, each resource area includes multiple short PRB continuously or discontinuously, resource area in the S resource area Number S includes：2 E powers, wherein, E is positive integer.

Further, the short CFI information is by short Physical Control Format Indicator Channel PCFICH channel bearings, short PCFICH The mode of channel occupancy resource location includes：In the first OFDM symbol in whole or first short TTI in one group of short TTI, Punching transmission and the control channel unit CCE or set of resource elements REG or resource block RE for using fixed position.

Further, the control area takes the quantity of following resource for fixed value or by base station by specifying signaling to be configured： XPRB, short PRB, RBG, wherein, the specified signaling includes：SIB, RRC, short CFI.

Further, the short CCE that the short PDCCH is used is included：2 short REG, or 4 short REG, or it is 8 short REG, or 16 short REG, when short CCE is made up of short REG, the short REG for choosing same intervals constitutes short CCE, Or, the short CCE takes one or more short PRB.

Further, the short REG to the RE of occupancy using the serial number of frequency domain after time domain after first frequency domain or first time domain as 0 To i, numbering identical resource block is chosen as a short REG, wherein, the short REG is described to the RE of occupancy In short PRB or described XPRB, remaining RE in addition to the RE that pilot tone takes.

Further, when the down control channel is located at first control area, each short TTI Candidate Set quantity is determined Mode at least includes one below：

In one group of short TTI, Candidate Set quantity is identical in each short TTI, and total Candidate Set quantity of the X subframe according to division It is determined that；

Candidate Set quantity described in the OFDM number pro rates that duration ratio or one group of short TTI according to one group of short TTI are included；

In one group of short TTI, the Candidate Set quantity in one or more short TTI is more than the Candidate Set quantity in remaining short TTI.

Further, when the down control channel is located at second control area, according to UE ID or C-RNTI in short TTI Short PDCCH test position is determined, wherein, determine the test position at least through one of in the following manner：

Determine first Candidate Set as unique test position in search space in short TTI；

First Candidate Set is determined in search space in short TTI as unique test position, and in one group of short TTI The first Candidate Set position determined is identical；

The short PDCCH takes the resource of fixed size as the test position, wherein, the test position is predefined or logical Cross RRC signaling determination.

Further, the short TTI of different terminals takes different short PRB or different OFDM symbols.

Further, the corresponding polymerization grade of the down control channel includes：Fixed one or more polymerization grades, by base Stand configuration one or more polymerization grades, wherein, the polymerization grade be selected from set L={ 1,2,4,8,16,24,32 }.

Further, when the down control channel is multiplexed and scrambled in short TTI, scramble sequence initial value is at least through short TTI Sequence number is determined, wherein, short TTI sequence numbers at least include one below：Sequence number in sequence number in 1ms subframes, radio frames.

According to another aspect of the present invention, a kind of determination method of down control channel is additionally provided, including：

Base station by the down control channel in short transmission time interval TTI to terminal transmission Downlink Control Information, wherein, it is described Down control channel is located at the first control area or the second control area, is located at first control zone in the down control channel During domain, Candidate Set quantity of the down control channel in short TTI is less than or equal to subframe in long evolving system LTE Candidate Set quantity, or each the short TTI Candidate Set quantity sum that is included in X subframe of the down control channel be less than or Person is equal to the Candidate Set quantity of X subframe in LTE, and wherein X is positive integer, is located at the second control in the down control channel During region, Candidate Set quantity of the down control channel in short TTI is equal to 1.

According to another aspect of the present invention, a kind of determining device of down control channel is additionally provided, applied to terminal, including：

Receiving module, the down control channel for receiving bearing downlink control information in short transmission time interval TTI, wherein, The down control channel is located at the first control area or the second control area, is located at the described first control in the down control channel During region processed, Candidate Set quantity of the down control channel in short TTI is less than or equal to long evolving system LTE neutrons The Candidate Set quantity of frame, or each the short TTI Candidate Set quantity sum that the down control channel is included in X subframe are small In or equal in LTE X subframe Candidate Set quantity, wherein X is positive integer, is located at second in the down control channel During control area, Candidate Set quantity of the down control channel in short TTI is equal to 1.

According to another aspect of the present invention, a kind of determining device of down control channel is additionally provided, applied to base station, including：

Transport module, for by the down control channel in short transmission time interval TTI to terminal transmission Downlink Control Information, Wherein, the down control channel is located at the first control area or the second control area, is located in the down control channel described During the first control area, Candidate Set quantity of the down control channel in short TTI is less than or equal to long evolving system LTE The Candidate Set quantity of middle subframe, or each the short TTI Candidate Set quantity that is included in X subframe of the down control channel it With the Candidate Set quantity less than or equal to X subframe in LTE, wherein X is positive integer, is located in the down control channel During the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1.

According to another aspect of the present invention, a kind of terminal is additionally provided, includes the determination dress of above-described down control channel Put.

According to another aspect of the present invention, a kind of base station is additionally provided, includes the determination dress of above-described down control channel Put.

By the present invention, the first control area or the second control area are determined as the down control channel for sending Downlink Control Information, When the down control channel is located at first control area, the short TTI of down control channel Candidate Set quantity is small In or equal in LTE subframe Candidate Set quantity, or each short TTI that the down control channel is included in X subframe Candidate Set quantity sum be less than or equal to LTE in X subframe Candidate Set quantity, down control channel be located at second control During region processed, Candidate Set quantity of the down control channel in short TTI is equal to 1, using above-mentioned technical proposal, solves related skill In art, existing down control channel can not support the problem of low time delay demand that there is provided one kind new granularity can be supported well TTI down control channel, at the same time, additionally it is possible to reduce the blind check complexity in TTI.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, of the invention shows Meaning property embodiment and its illustrate be used for explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：

Fig. 1 is the flow chart of the determination method of the down control channel according to the embodiment of the present invention；

Fig. 2 is independently to take OFDM with short PDSCH time division multiplexings in short TTI according to the short PDCCH of the embodiment of the present invention The schematic diagram of symbol；

Fig. 3 is the schematic diagram for taking OFDM symbol part resource in short TTI according to the short PDCCH of the embodiment of the present invention；

Fig. 4 takes the schematic diagram of resource for short REG in the short TTI according to the embodiment of the present invention；

Fig. 5 takes the schematic diagram of resource for short CCE in the short TTI according to the embodiment of the present invention；

Fig. 6 is another flow chart of the determination method of the down control channel of basic inventive embodiments；

Fig. 7 is the structured flowchart of the determining device of the down control channel according to the embodiment of the present invention；

Fig. 8 is another structured flowchart of the determining device of the down control channel according to the embodiment of the present invention；

Fig. 9 is the another structured flowchart of the determining device of the down control channel according to the embodiment of the present invention；

Figure 10 is to be shown according to the short PDCCH of the preferred embodiment of the present invention part resource that OFDM symbol is taken in short TTI It is intended to；

Figure 11 is to take part with short PDSCH frequency division multiplexings in short TTI according to the short PDCCH of the preferred embodiment of the present invention The schematic diagram of short PRB resources.

Embodiment

Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that in the case where not conflicting, The feature in embodiment and embodiment in the application can be mutually combined.

Other features and advantages of the present invention will be illustrated in the following description, also, partly become from specification it is aobvious and It is clear to, or is understood by implementing the present invention.The purpose of the present invention and other advantages can be by the specifications, right write Specifically noted structure is realized and obtained in claim and accompanying drawing.

In order that those skilled in the art more fully understand the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, Technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention The embodiment of a part, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having There is the every other embodiment made and obtained under the premise of creative work, should all belong to the scope of protection of the invention.

In embodiments of the present invention, a kind of determination method of down control channel is additionally provided, Fig. 1 is according to the embodiment of the present invention Down control channel determination method flow chart, as shown in figure 1, comprising the following steps：

Step S102, terminal receives the down control channel transmission of bearing downlink control information in short TTI, wherein, it is described descending Control channel is located at the first control area or the second control area, when the down control channel is located at first control area, Candidate Set quantity of the down control channel in short TTI is less than or equal to the Candidate Set of subframe in long evolving system LTE Quantity, or each the short TTI Candidate Set quantity sum that the down control channel is included in X subframe are less than or equal to The Candidate Set quantity of X subframe in LTE, wherein X is positive integer, when the down control channel is located at the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1.

By the interaction between terminal and base station, determine the first control area or the second control area as the descending control of transmission The down control channel of information, when the down control channel is located at first control area, the down control channel Short TTI Candidate Set quantity is less than or equal to the Candidate Set quantity of subframe in LTE, or the down control channel in X son Each the short TTI included in frame Candidate Set quantity sum is less than or equal to the Candidate Set quantity of X subframe in LTE, under When row control channel is located at the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1, using above-mentioned skill Art scheme, is solved in correlation technique, the problem of existing down control channel can not support low time delay demand well there is provided It is a kind of to support new granularity TTI down control channel, at the same time, additionally it is possible to reduce the blind check complexity in TTI.

Alternatively, before the Downlink Control Information for receiving down control channel transmission of the base station in short transmission time interval TTI, It can also carry out following technical scheme：The down control channel of bearing downlink control information is detected in control area in short TTI, Wherein, above-mentioned control area includes at least one of：First control area, the second control area, wherein, the first control zone Contain in domain only containing a position candidate in multiple position candidates, second area, the control area detection carrying in short TTI The down control channel of Downlink Control Information, is primarily present following two situations：By detecting multiple times in the first control area Bit selecting puts the above-mentioned down control channel of reception；Or the descending control of position candidate reception in the second control area by determination Channel；Or the down control channel of bearing downlink control information is detected in the control area in short TTI, following two can also be included The situation of kind：Detected in all short TTI control area；Or detected in the short TTI in part control area, wherein, pass through In the following manner determines the short TTI in part：The short TTI in above-mentioned part is determined by the configuration of base station, wherein, configured by base station Configuration signal includes at least one of：System information block SIB, radio resource control RRC, Downlink Control Information DCI；In advance First set the short TTI in the part；According to cell ID ID or terminal iidentification UE ID or Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI The implicit short TTI for determining detection, specifically, can be configured by SIB or RRC or DCI, when using DCI configurations, DCI Transmitted in specific TTI transmission, the first short TTI such as in one group of short TTI, when being detected in the second control area, short TTI Test position and short TTI in short PDCCH positions by least through one of in the following manner determine：By UE ID or C-RNTI is determined；Indicate that DCI or RRC is indicated by descending control.

In the optional example of the embodiment of the present invention, control area takes short TTI resources at least through one of in the following manner：Control Region is time-multiplexed with short PDSCH, and takes X independent orthogonal frequency division multiplex OFDM symbol, wherein, short TTI bags N number of OFDM symbol is included, X and N are positive integer, and X is less than or equal to N；Control area takes X OFDM symbol Number part resource, wherein, take OFDM symbol part resource position entered by the configuration signal being pre-configured with or base station is issued Row determines that configuration signal includes：Short CFI information in high-level signaling System information block SIB or physical layer signaling；Control area with Short PDSCH frequency division multiplexings, and take the short Physical Resource Block PRB resources in part；Wherein, the short PRB resource locations in part are taken Be pre-configured with or configuration signal that base station is issued by way of determine, configuration signal includes at least one of：The publicly-owned letter of cell Make the proprietary signaling RRC of SIB, UE.

Further, control area takes the part frequency domain resource of X OFDM symbol, can be achieved through the following technical solutions： Part frequency domain resource is taken according to specified order to one of at least following frequency domain resource：Short PRB, XPRB, resource block group RBG, Wherein, above-mentioned specified order includes：Taken since the appointed sequence number of above-mentioned frequency domain resource to the frequency domain resource sequence number of configuration, on XPRB is stated for, with PRB composition XPRB M short, M is positive integer in short TTI；By base station in predefined S money One is selected in source region, and the resource area selected is configured to above-mentioned control area, wherein, above-mentioned S resource area In each resource area include multiple short PRB continuously or discontinuously, resource area number S includes：2 E powers, E is just Integer, i.e. S include 2,4,8,16 ... 128.

Above-mentioned technical proposal is illustrated below in conjunction with an example, terminal detection bearing downlink control in control area in short TTI Info Down control channel, detection includes at least one of：The descending control letter of blind Detecting in the control area that multiple terminals is shared Road；Detection down control channel is received in the control area that terminal is used alone.

It should be noted that the first alphabetical S of the English abbreviation in the embodiment of the present invention can be understood as short abbreviation again, But the understanding situation of all English abbreviations is not limited.

Wherein, down control channel can be described as SPDCCH (Short PDCCH) again, and above-mentioned short TTI is to be less than 1ms on the time TTI, for applied to LTE system, short TTI is made up of N number of OFDM symbol, comprising OFDM symbol number Mesh N is at least one of { 1,2,3,4,5,6,7 }.

Further, bearing downlink control information down control channel is detected in terminal control area in short TTI, can be by following Scheme is realized：Detected in all short TTI；Detect, specifically include in the short TTI in part：(1) the short TTI configured in base station Middle detection；Above-mentioned base station configuration is configured including the use of SIB or RRC signaling, is appointed in the cycle with some cycles configurating terminal Perform detection in the short TTI of quantity of anticipating or finite aggregate quantity.(2) detected in predefined or fixed short TTI.For example, Short TTI is divided with 2 OFDM symbols, base station configures 70 short TTI in the 10ms cycles by RRC signaling using 70bit In which TTI need some terminal detect.

Above-mentioned SPDCCH in short TTI resource using mode include time division multiplexing (Time Division Multiplexing, TDM) time division multiplexing, frequency division multiplexing pattern (Frequency Division Multiplexing, FDM) frequency division multiplexing mode, its Middle FDM modes configure the short PRB in part taken by eNB, and TDM modes take independent OFDM symbol or occupancy The part resource of OFDM symbol, takes the band position that OFDM symbol part resource notifies SPDCCH to take by CFI.

When taking TDM：When above-mentioned SPDCCH uses resource in a tdm fashion in short TTI, SPDCCH regions X OFDM symbol before taking in system bandwidth, or for the preceding X OFDM in short TTI bandwidth (being less than system bandwidth) Symbol.Wherein, if short TTI include N number of OFDM symbol, X≤N, the preferred values of X are 1.X values can be fixed Or configured by base station, Fig. 2 is to be time-multiplexed independently with short PDSCH in short TTI according to the short PDCCH of the embodiment of the present invention Take the schematic diagram of OFDM symbol；As shown in Fig. 2 in the bandwidth that short TTI take, SPDCCH regions take short First OFDM symbol in TTI.When resource is overlapping with Legacy PDCCH regions in short TTI simultaneously, preferential Legacy PDCCH transmission (less preferred destroy in the Legacy PDCCH of part in resource transmission short TTI control channel or Traffic Channel).

In embodiments of the present invention, above-mentioned short CFI information is short by short Physical Control Format Indicator Channel PCFICH channel bearings The mode of PCFICH channel occupancy resource locations includes：The first OFDM in whole or first short TTI in one group of short TTI In symbol, punching transmission and the control channel unit CCE or set of resource elements REG or resource block RE for using fixed position, Above-mentioned control area takes the quantity of following resource for fixed value or by base station by specifying signaling to be configured：X PRB, short PRB, RBG, wherein, above-mentioned specified signaling includes：SIB, RRC, short CFI；The short CCE that above-mentioned short PDCCH is used is included： 2 short REG, 4 short REG, 8 short REG, 16 short REG, or, above-mentioned short CCE take the RE of specified quantity Resource, when short CCE is made up of short REG, the short REG for choosing same intervals constitutes short CCE, or, above-mentioned short CCE Take one or more short PRB.

Further, above-mentioned short REG be to the numbering of time domain after time domain after the first frequency domain of the RE of occupancy or first frequency domain 0 to i, it is right Numbering identical resource block is chosen as a short REG, wherein, above-mentioned short REG be to the RE of occupancy in above-mentioned short PRB or In above-mentioned XPRB, remaining RE in addition to the RE that pilot tone takes.

The embodiment of the present invention to above-mentioned technical proposal further improvement is that, above-mentioned down control channel be located at above-mentioned first control During region, each short TTI Candidate Set quantity determination mode at least includes one below：In one group of short TTI, each short TTI Interior Candidate Set quantity is identical, and is determined according to total Candidate Set quantity of X subframe of division；According to one group of short TTI difference when The long above-mentioned Candidate Set quantity of pro rate；In one group of short TTI, the Candidate Set quantity in one or more short TTI is short more than remaining Candidate Set quantity in TTI.

Wherein, when above-mentioned down control channel is located at above-mentioned second control area, according to customer equipment identification UE ID in short TTI Or Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI determines short PDCCH test position, wherein, at least through one of in the following manner Determine above-mentioned test position：Determine first Candidate Set as unique above-mentioned test position in search space in short TTI； First Candidate Set is determined in search space in short TTI as unique above-mentioned test position, and determined in one group of short TTI First Candidate Set position is identical；Short PDCCH takes the resource of fixed size as above-mentioned test position, wherein, test position is pre- Definition is determined by RRC signaling.

Short TTI tim e- domain detection position can be determined by the following technical programs：All short TTI, the monitoring determined is configured by base station Position, the test position being determined according to UE ID or C-RNTI, wherein, the configuration signal of above-mentioned base station configuration is at least wrapped Include one below：RRC or SIB, when using DCI configurations, DCI is transmitted in specific TTI, such as in one group of short TTI First short TTI in transmit.Wherein, when using non-blinded fashion, the short PDCCH in short TTI test position and short TTI Position at least through one of in the following manner by determining：Determined by UE ID or C-RNTI；DCI or RRC is indicated by descending control Indicate.

In embodiments of the present invention, when being indicated using DCI, indicated by the first order in above-mentioned DCI two-stages, Wherein, the above-mentioned first order includes：Publicly-owned or unchanged signaling bit domain, and second level DCI test position, it is above-mentioned The first order carries out blind check, and the above-mentioned second level is without blind check, in order to adapt to the delay requirement of different priorities, different terminals it is short TTI takes different short PRB, or takes different OFDM symbols, specifically, can be two-stage DCI when using DCI In the first order, the first order includes publicly-owned/unchanged signaling bit domain and second level DCI specific test position, second Level DCI includes UE-specific PDSCH scheduling parameters.

Wherein first order DCI stills need blind check, second level DCI without blind check, therefore can will likely blind Detecting number of times/candidate Collection is fully allocated to first order DCI detection.Second level DCI position is located among the PDSCH positions of scheduling.Do not surpass The position of PDSCH occupancy is crossed, first order DCI is located at first TTI in one group of short TTI, or positioned at Legacy PDCCH Region.Second level DCI is located in the short TTI in part in one group of short TTI.

Further, X OFDM symbol part frequency domain resource before short PDCCH region takes, the frequency domain resource position specifically taken Put and configured by base station, it can be understood as be independent to take X OFDM symbol, continuous first X are taken preferably in short TTI OFDM symbol, but be also not excluded for taking continuous rear X OFDM symbol, the present invention implements to be not construed as limiting this.

Specifically, before in base station configuration system bandwidth X OFDM symbol part frequency domain resource, or be configured to short TTI The part frequency domain resource of preceding X OFDM symbol in bandwidth (being less than system bandwidth), Fig. 3 is according to the embodiment of the present invention SPDCCH takes the schematic diagram of the part resource of OFDM symbol in short TTI, as shown in figure 3, base station use match somebody with somebody confidence Order is carried by SPCFICH, or is carried by MIB, SIB, RRC signaling.

Wherein, X OFDM symbol part frequency domain resource before short PDCCH region takes, including at least one of in the following manner：

(1) since sPRB/XPRB/RBG (subsequent descriptions are by taking sPRB as an example) sequence number is minimum or highest, take to base station The sPRB sequence numbers of configuration, the sPRB sequence numbers of configuration preferably select it from set { sPRB i1, sPRB i2 ..., sPRB ix } One, element number preferably 2 or 4 or 8 or 16 in set.

(2) base station selects one to be configured in SPDCCH regions, x resource area often in predefined x resource area Individual resource area includes the sPRB, resource area number x preferably 2 or 4 or 8 or 16 of continuous (or discontinuous --- less preferred) It is individual.SPRB quantity that each resource area is included is identical (or different --- less preferred).The sPRB that each resource area is included Not overlapping (or overlapping --- it is less preferred).

Wherein, the part frequency domain resource of X OFDM symbol, the channel before short PCFICH channel bearings SCFI information is notified Taking the mode of resource location includes：In the first OFDM symbol in whole or first short TTI in one group of short TTI Punching transmission, uses CCE or REG or the RE resource of fixed position.In wherein first OFDM symbol middle finger system bandwidth Whole OFDM symbol, or the OFDM symbol being configured in short TTI bandwidth (be less than system bandwidth) (truncates OFDM symbol).Wherein fixed position is CCE or REG or the RE resource of continuous on frequency domain or discrete selection.Wherein, Above-mentioned one group of short TTI refers to the one group of short TTI gone out with X 1ms subframe according to short TTI granularity division.Here, it is above-mentioned One group of short TTI particular number specifically divides relevant with short TTI, in X 1ms subframe with identical it is N number of or different N1, N2 ... individual OFDM symbol number divides several short TTI, wherein X is positive integer, N and { N1, N2 ... } for 1 to 7 integer；One group of short TTI is for example divided in 1ms subframes, such as at conventional cyclic prefix (Normal Cyclic Prefix, NCP) When to 14 OFDM symbols with 4,3,4,3 OFDM symbols be divided into 4 short TTI altogether, or with 2 OFDM Symbol is divided into 7 short TTI altogether；Or one group of short TTI is divided in 2ms subframes, to 28 OFDM such as in NCP Symbol is divided into 7 short TTI by granularity order of 4 OFDM symbols.

Continuously choose preferably from system bandwidth or numbered for short TTI bandwidth frequency domains position CCE or REG or RE minimum Or highest starts continuous selection.Discrete selection is preferably from system bandwidth or for short TTI bandwidth frequency domains position equal intervals Choose CCE or REG or the RE resource of fixed qty.

Above-mentioned short PDCCH uses CCE as control channel unit, and the polymerization grade used includes AL=1,2,4,8CCE At least one, during FDM：When above-mentioned SPDCCH uses resource in short TTI in FDM modes, short TTI are used Middle part sPRB resources.Used sPRB resource locations determination mode includes：(1) the part sPRB taken is configured by eNB； (2) fixed or predefined sPRB positions.Wherein, sPRB implications can be construed to：LTE is truncated in units of short TTI The base unit obtained in system after PRB pair.For example in N=2, sPRB includes 12 subcarriers, time domain on frequency domain It is upper to include 2 OFDM symbols.

It should be noted that the corresponding polymerization grade of above-mentioned down control channel includes：Fixed one or more polymerization grades, The one or more polymerization grades configured by base station, wherein, above-mentioned polymerization grade be selected from set L=1,2,4,8,16,24, 32}。

Above-mentioned short PDCCH region uses part sPRB resources in short TTI, and it is 1 XPRB or sPRB that minimum, which takes unit, Or RBG, it is actual to take Y XPRB or sPRB or RBG.Wherein, XPRB implications are explained：With M in short TTI SPRB constitutes XPRB, and XPRB occupancy resource sizes are identical with LTE PRB pair resource sizes, such as contain 168RE (normal During CP), i.e., M value is inversely proportional with short TTI length.For example：During N=2, now M=7 sPRB constitutes 1 XPRB.RBG is resource block group, and different system bandwidth value is different.

Short TTI positions where above-mentioned SPDCCH are all short TTI or part short TTI, which part short TTI Position is configured by base station and determined, i.e., configuration section short TTI just have SPDCCH.Configuration signal includes SIB or RRC.

Frequency domain position where above-mentioned SPDCCH is that fixed position or base station are configured using XPRB or sPRB or RBG set, tool Body quantity is fixed or base station configuration.Wherein fixed form includes all TTI using identical frequency domain position or according to short TTI Frequency domain position where the implicit SPDCCH determined in short TTI of index.Base station configuration mode can be according to different short TTI Configure different frequency domain positions, or configuration identical frequency domain position.XPRB or sPRB that XPRB or sPRB or RBG set are included Or RBG quantity is fixed or configured by base station, quantity is preferably gathered at least one of { 1,2,4,6,8,10 }.Configuration signal Including RRC or SIB；Above-mentioned SPDCCH uses SCCE as control channel unit, SCCE comprising 24 or 8 or 16 SREG, or SCCE directly use a number of RE resources.SREG is accounted in sPRB or XPRB in pilot tone Field Number 0-i during with after first frequency domain in the RE beyond RE, numbering identical as a SREG, i values to gather 1,3, At least one of 7th, 15 }.When SCCE is made up of SREG, SREG compositions SCCE, such as SREG are preferably chosen at equal intervals There are 8, SCCE is made up of 2 SREG, then SCCE index 0 are made up of SREG index 0,4.

For example, Fig. 4 is the schematic diagram of SREG occupancy resources in the short TTI according to the embodiment of the present invention, as shown in figure 4, So that short TTI are comprising 4 OFDM symbols as an example, XPRB=3sPRB, SREG numbering 0-7, numbering identical is used as one Individual SREG.When now there are 4 SCCE in an XPRB, then a SCCE is constituted by 2 SREG, such as according to It is spaced the principle chosen, SREG0 and SREG4 compositions SCCE0.

When SCCE directly uses a number of RE resources, preferably SCCE takes 1 sPRB or sPRB integral multiple. Fig. 5 is the schematic diagram of SCCE occupancy resources in the short TTI according to the embodiment of the present invention, as shown in figure 5, short TTI Comprising 4 OFDM symbols, SCCE takes whole sPRB in XPRB.For another example Short TTI include 2 OFDM During symbol, SCCE takes multiple sPRB, such as takes 2 sPRB.

Blinded fashion in present example uses search space mode, with X 1ms subframe according to short TTI granularity divisions Go out maximum blind check number of times sum in one group of short TTI X 1ms subframe of total blind check number of times no more than LTE.For example：1ms The short TTI Candidate Set quantity of each in subframe sum is no more than Candidate Set quantity in LTE 1ms subframes.

Candidate Set quantity determination mode includes at least one of in the short of each in search space TTI：

Candidate Set quantity is identical and X 1ms subframe according to division total in each short TTI in (1) one group of short TTI Candidate Set quantity is determined.Such as, total Candidate Set quantity of X 1ms subframe is S, then the Candidate Set number in each short TTI Measure and beIt is individual, wherein, n represents the short TTI numbers marked off.For example：During NCP, with the proprietary search spaces of UE Exemplified by USS, 1ms subframes (X=1) mark off 7 short TTI according to short TTI granularities N=2, then each short TTI Middle Candidate Set quantity isIt is individual.2ms subframes (X=2) mark off 7 short TTI according to short TTI granularities N=4, Then Candidate Set quantity is in each short TTIIt is individual.

(2) according to one group of short TTI different duration pro rate Candidate Set quantity.According to 4-3-4-3 in such as 1ms subframes OFDM symbol marks off 4 short TTI, and Candidate Set quantity is according to 4 in each short TTI:3:4:3 carry out pro rate candidate Collect quantity, then in 1ms subframes in each short TTI Candidate Set quantity be respectively 4,3,4,3.

Candidate Set quantity in (3) one groups of short TTI in wherein one or more short TTI is more than in remaining short TTI Candidate Set quantity.It is preferred that, first short TTI Candidate Sets quantity is more than follow-up short TTI Candidate Set quantity.For example：One group of short Candidate Set quantity in TTI in first short TTI, which is more than in Candidate Set quantity in remaining follow-up short TTI, such as 1ms subframes, draws Point 4 short TTI, wherein Candidate Set quantity is that Candidate Set quantity is equal in 7, follow-up 3 short TTI in first short TTI For 3. preferably, two-stage DCI first order DCI detection is supported in first short TTI search space, or supports CSS simultaneously Two-stage DCI second level DCI detection is supported with the search space of USS detection, and follow-up short TTI, or is only supported USS detection.Above-mentioned two-stage DCI is principal and subordinate DCI or speed DCI.I.e. the first order collectively forms completion with second level DCI Scheduling control information, first order DCI is included to be included in common control information part or the part infrequently changed, second level DCI Different schedule informations or the part frequently changed between UE.

Polymerization grade corresponding to Candidate Set can be fixed or configured by base station.Polymerization grade preferably set L=1,2,4,8,16, 24th, 32 } at least one of (E) CCE/SCCE.Configuration uses SIB or RRC.

Specifically, by taking USS as an example, with 2 OFDM symbol granularity divisions, 7 short TTI in 1ms, supporting no more than existing There is the maximum blind check number of times of 1ms subframes.The maximum blind check number of times in the 1ms times, corresponding polymerization grade and time are not increased now Selected works quantity needs further limitation, and according to decile Candidate Set principle, each short TTI have 2 Candidate Sets.For example：Often Polymerization grade only supports AL=1CCE in individual short TTI and Candidate Set supports 2.Now consider that short TTI are used for small cover Lid scene, channel quality is preferable, without using big polymerization grade.

K no longer represents subframe sequence number in the definition of search space, and represents short TTI sequence numbers, such as the short TTI in 1ms subframes Sequence number, either in 1 radio frames short TTI sequence numbers or,

Short TTI sequence numbers in the one group of short TTI gone out with X 1ms sub-frame division.L represents polymerization grade, m=0 ... M^(L), represent Candidate Set, N_CCE,kThe CCE quantity in short TTI index k is represented, i=0 ..., L-1 represents polymerization grade Comprising CCE：

Y_k=(AY_k-1)mod D

Y_-1=n_RNTI≠ 0, A=39827, D=65537and k=n_TTI, wherein, Y_kRepresent to detect CCE in short TTI#k Original position.

For example, search space Candidate Set is as shown in table 1, wherein polymerization grade can be fixed or by base station by taking L=1CCE as an example Configure specific polymerization grade.

The SPDCCH Candidate Sets of table 1

Rather than blinded fashion, unique SPDCCH test positions are determined according to UE ID or C-RNTI in short TTI, no Blind Detecting is carried out again.Method includes：(1) first Candidate Set in search space, each first position of TTI hash iteration.(2) The first positions of each TTI are identical, for having obstructing problem always using whole OFDM symbol but indicating OFDM symbols for CFI Relatively it is applicable during number part frequency domain position.(3) SPDCCH takes the resource of fixed size, and UE-specific is uniquely determined.

I.e. non-blinded fashion, the short TTI of detection are configured by base station or are determined according to UE ID or C-RNTI.With confidence Make as RRC or SIB.For example, detect that the short TTI of detection are not each short TTI for the SPDCCH in USS, But configure which short TTI in certain time length T ms will be detected, use (T/X) × (L/N) bits by RRC signaling, Wherein L is the OFDM symbol number included in X 1ms subframe, and N represents the OFDM symbol number that short TTI are included. Or terminal is according to UE ID or C-RNTI value and the possible base station implicit short TTI for determining detection of configuration relevant parameter. For example, the relevant parameter of configuration has duration T and density factor m, the short TTI Index n now detected in duration T can To be expressed as (by taking C-RNTI as an example)：N=C-RNTI mod ((T/X) × (L/N)/m).Wherein m can take the number more than 0, Such as at least one of set { 1/8,1/6,1/4,1/2,1,2,4,8,10 }.Duration T preferably gathers { 10,20,40,80 } At least one of.

For blind check scheme, blind check position candidate is seldom actually in each short TTI, very close to non-blind check.For Non-blind procuratorial organ case, terminal it is determined that Candidate Set on carry out SPDCCH detection.I.e. it is determined that Candidate Set position on one kind The polymerization grade of determination and the Candidate Set of a determination are detected.

Method 1：Still use Rel-8PDCCH search spaces, and k=n_TTI, the CCE calculated in the case where L is certain Original position is the unique positions that UE detects SPDCCH, no longer other Candidate Sets of blind check.Now polymerization grade uses fixation L=1CCE, or polymerization grade L are configured by RRC signaling.Different UE test position is distinguished by C-RNTI.

Method 2：Processing complexity is reduced on the basis of method 1, processing delay is reduced.Hash iteration between TTI is no longer carried out, Y_k=n_RNTIAnd k=n_TTI.At this point for the pure TDM modes of SPDCCH, then calculating position is identical in each TTI, if two UE SPDCCH is collided in a certain TTI and is then collided (RNTI is constant and L is constant) always, and 1 is taken for SPDCCH OFDM symbol part frequency domain position mode, because the total CCE quantity of each TTI is different, then exists in two UE collisions of TTI i Not necessarily collided in TTI i+1.

Method 3：SPDCCH takes the resource of fixed size, and UE-specific is uniquely determined.SPDCCH is at first Using fixed resource size, such as L CCE, i.e., 9L REG in OFDM symbol, and consider that processing is simple, short TTI Using in bandwidth X MHz amount to N number of REG, with9 REG composition 1CCE are chosen at equal intervals, are amounted to Individual CCE.I.e. test position isFor example：During pure TDM modes, 20MHz is used Bandwidth, 200 REG (when having CRS) altogether, L=1, altogether 22 CCE, it according to step-length is 22 etc. that each CCE, which is, 9 REG compositions are chosen at interval, and detection SPDCCH particular location is n_RNTImodN_CCE,k, k=n_TTI.For SPDCCH 1 OFDM symbol part frequency domain position mode is taken, using fractional bandwidth, REG and CCE quantity is entered according to fractional bandwidth Row is determined.

In order to improve above-mentioned technical proposal, in embodiments of the present invention, a kind of determination method of down control channel is additionally provided, Fig. 6 is another flow chart of the determination method of the down control channel of basic inventive embodiments, as shown in fig. 6, including following step Suddenly：

Step S602：Base station by the down control channel in short transmission time interval TTI to terminal transmission Downlink Control Information, Wherein, the down control channel is located at the first control area or the second control area, is located in the down control channel described During the first control area, Candidate Set quantity of the down control channel in short TTI is less than or equal to long evolving system LTE The Candidate Set quantity of middle subframe, or each the short TTI Candidate Set quantity that is included in X subframe of the down control channel it With the Candidate Set quantity less than or equal to X subframe in LTE, wherein X is positive integer, is located in the down control channel During the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1.

By base station and the above-mentioned interaction of terminal, determine the first control area or the second control area as the descending control of transmission The down control channel of information, when the down control channel is located at first control area, the down control channel Short TTI Candidate Set quantity is less than or equal to the Candidate Set quantity of subframe in LTE, or the down control channel in X son Each the short TTI included in frame Candidate Set quantity sum is less than or equal to the Candidate Set quantity of X subframe in LTE, under When row control channel is located at the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1, using above-mentioned skill Art scheme, is solved in correlation technique, the problem of existing down control channel can not support low time delay demand well there is provided It is a kind of to support new granularity TTI down control channel, at the same time, additionally it is possible to reduce the blind check complexity in TTI.

Base station side allows multiple short PDCCH multiplexings and scrambling in short TTI when sending SPDCCH, be multiplexed with short TTI Multiplexing.During scrambling in units of short TTI or subframe, wherein scramble sequence initial value specifically can contemplate in the following manner at least it One：

It should be noted that short TTI sequence numbers at least include one below：Sequence number in sequence number in 1ms subframes, radio frames, for example During TTI=2 OFDM, 7 short TTI are marked off in 1ms subframes.Short TTI serial number 0-6 in 1ms subframes, scrambling is just Initial value determination mode includes：

(1) existing mode,--- the scramble sequence of TTI in subframe is not differentiated between, still using subframe to be single Digit separator scramble sequence.

(2) TTI is based on,--- only differentiate between the scramble sequence of 7 difference TTI in 1ms, nTTI =0,1 ..., 6.

(3) TTI is based on,--- distinguish the scrambling sequence for amounting to 70 TTI in radio frames Row, n_TTI=0,1 ..., 6.

During TTI=2 OFDM, 7 short TTI, short TTI serial number 0-69 in radio frames are marked off in 1ms subframes, plus Disturbing initial value determination mode includes：

Based on TTI,--- distinguish the scramble sequence for amounting to 70 TTI in radio frames, n_TTI=0,1 ..., 69.

Based on TTI,--- only differentiate between the scramble sequence of 7 difference TTI in 1ms, n_TTI =0,1 ..., 69.

Based on subframe,--- the scramble sequence of TTI in subframe is not differentiated between, still using subframe as unit area Divide scramble sequence.

Illustrate, it is above-mentioned only by taking the short TTI of 2 OFDM symbols as an example, for the short TTI of remaining length of 1-7 symbols, make It is similar with method.For example marked off with 7 OFDM symbols in 2 short TTI, above-mentioned formula and 7 short TTI are changed to 2 Short TTI, n_TTIRepresent 1ms subframes in 0,1 or radio frames in 0,1 ..., 19.

For (1)~(3), when short PDCCH takes part SPRB in FDM modes, for using the proprietary scramblers of UE , will during sequenceIt is changed toWherein the parameter is configured by RRC, and wherein m can be always 0, or m=0 or 1 and Configured by base station, represent search space set.

It should be noted that for foregoing each method embodiment, in order to be briefly described, therefore it is all expressed as a series of dynamic Combine, but those skilled in the art should know, the present invention is not limited by described sequence of movement, because foundation The present invention, some steps can be carried out sequentially or simultaneously using other.Secondly, those skilled in the art should also know, say Embodiment described in bright book belongs to preferred embodiment, and involved action and module is not necessarily essential to the invention.

A kind of determining device of down control channel is additionally provided in the present embodiment, applied to terminal, for realizing above-mentioned implementation Example and preferred embodiment, had carried out repeating no more for explanation, the module being related in the device had been illustrated below. As used below, term " module " can realize the combination of the software and/or hardware of predetermined function.Although following examples Described device is preferably realized with software, but hardware, or the realization of the combination of software and hardware is also possible and quilt Conception.Fig. 7 is the structured flowchart of the determining device of the down control channel according to the embodiment of the present invention.As shown in fig. 7, should Device includes：

Receiving module 70, the down control channel for receiving bearing downlink control information in TTI, wherein, the descending control Channel is located at the first control area or the second control area, when the down control channel is located at first control area, institute State Candidate Set number of Candidate Set quantity of the down control channel in short TTI less than or equal to subframe in long evolving system LTE Amount, or each the short TTI Candidate Set quantity sum that the down control channel is included in X subframe is less than or equal to LTE The Candidate Set quantity of middle X subframe, wherein X is positive integer, when the down control channel is located at the second control area, institute Candidate Set quantity of the down control channel in short TTI is stated equal to 1.

By the effect of receiving module 70, determine the first control area or the second control area as under transmission Downlink Control Information Row control channel, when the down control channel is located at first control area, the short TTI's of the down control channel Candidate Set quantity is less than or equal to the Candidate Set quantity of subframe in LTE, or the down control channel is included in X subframe Each short TTI Candidate Set quantity sum be less than or equal to LTE in X subframe Candidate Set quantity, it is descending control believe When road is located at the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1, using above-mentioned technical proposal, Solve in correlation technique, there is provided a kind of energy for the problem of existing down control channel can not support low time delay demand well New granularity TTI down control channel is enough supported, at the same time, additionally it is possible to reduce the blind check complexity in TTI.

Fig. 8 is another structured flowchart of the determining device of the down control channel according to the embodiment of the present invention, and said apparatus also includes： Detection module 72, for the down control channel of the above-mentioned Downlink Control Information of control area detection carrying in short TTI, wherein, Above-mentioned control area includes：First control area, the second control area, wherein, detection module 72, including：First detection is single Member 720, for the above-mentioned down control channel of blind Detecting in above-mentioned first control area；Or second detection unit 722, for The non-above-mentioned down control channel of blind Detecting in above-mentioned second control area, changes angle understanding, and detection module 72 includes：3rd inspection Unit 724 is surveyed, for being detected in all short TTI control area；Or the 4th detection unit 726, in the short TTI in part Control area in detect, wherein, the short TTI in above-mentioned part is determined in the following manner：Determined by the configuration of above-mentioned base station above-mentioned The short TTI in part；Preset the short TTI in above-mentioned part.

The embodiment of the present invention additionally provides a kind of terminal, includes the determining device of down control channel described above.

A kind of determining device of down control channel is additionally provided in the present embodiment, applied to base station, for realizing above-mentioned implementation Example and preferred embodiment, had carried out repeating no more for explanation, the module being related in the device had been illustrated below. As used below, term " module " can realize the combination of the software and/or hardware of predetermined function.Although following examples Described device is preferably realized with software, but hardware, or the realization of the combination of software and hardware is also possible and quilt Conception.Fig. 9 is the another structured flowchart of the determining device of the down control channel according to the embodiment of the present invention.As shown in figure 9, The device includes：

Transport module 90, for by the down control channel in short transmission time interval TTI to terminal transmission Downlink Control Information, Wherein, the down control channel is located at the first control area or the second control area, is located in the down control channel described During the first control area, Candidate Set quantity of the down control channel in short TTI is less than or equal to long evolving system LTE The Candidate Set quantity of middle subframe, or each the short TTI Candidate Set quantity that is included in X subframe of the down control channel it With the Candidate Set quantity less than or equal to X subframe in LTE, wherein X is positive integer, is located in the down control channel During the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1.

By the effect of transport module 90, determine the first control area or the second control area as under transmission Downlink Control Information Row control channel, when the down control channel is located at first control area, the short TTI's of the down control channel Candidate Set quantity is less than or equal to the Candidate Set quantity of subframe in LTE, or the down control channel is included in X subframe Each short TTI Candidate Set quantity sum be less than or equal to LTE in X subframe Candidate Set quantity, it is descending control believe When road is located at the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1, using above-mentioned technical proposal, Solve in correlation technique, there is provided a kind of energy for the problem of existing down control channel can not support low time delay demand well New granularity TTI down control channel is enough supported, at the same time, additionally it is possible to reduce the blind check complexity in TTI.

The embodiment of the present invention additionally provides a kind of base station, includes the determining device of above-described down control channel.

In order to be better understood from the determination process of above-mentioned down control channel and the determination process of down control channel, below in conjunction with Preferred embodiment is illustrated, but is not intended to limit the scope of the invention.

Preferred embodiment 1

Base station is sent to UE by SPDCCH bearing downlink control information, and the SPDCCH is in short TTI with TDM Mode takes resource.The present embodiment is by taking NCP Network Control Protocols as an example, and now short TTI include 2 OFDM symbols, And mark off 7 short TTI in 1ms subframes with 2 OFDM symbols.Or according to 4-3-4-3 OFDM in 1ms subframes Symbolic construction marks off 4 short TTI.Or according to 4 OFDM symbols mark off 7 short TTI in 2ms subframes.

X OFDM symbol before SPDCCH regions are taken in system bandwidth, or (it is less than system band for short TTI bandwidth It is wide) in preceding X OFDM symbol.Wherein, if short TTI include N number of OFDM symbol, X≤N, the preferred values of X For 1.X values can be fixed or configured by base station.SPDCCH takes first OFDM symbol in short TTI.With short TTI Exemplified by 2 OFDM symbols, the bandwidth B andwidth that now short TTI are used is that (whole resources are short to system bandwidth TTI user uses) or a part for system bandwidth (legacy UE and short TTI users take a part of in system bandwidth respectively Frequency domain resource).The wherein resource overlapping with Legacy PDCCH, preferential Legacy PDCCH are used.

Resource granularity, polymerization grade, search space use phase when now SPDCCH and PDCCH takes 1 OFDM symbol Same structure.The CCE constituted using REG is as basic polymerization grade AL, and a variety of AL=1,2,4,8 can use, specifically used Polymerization grade fix or configured by base station.

Base station side allows multiple SPDCCH in short TTI to be multiplexed and scramble when sending SPDCCH, be multiplexed with short TTI Middle multiplexing.During scrambling in units of short TTI or subframe, wherein scramble sequence initial value is specifically determined it is contemplated that being based on TTI,Distinguish the scramble sequence for amounting to 70 TTI in radio frames, n_TTI=0,1 ..., 6.

To the sequence after scrambling, modulated using QPSK, sending diversity transmission mode using SFBC carries out layer mapping and precoding. Finally only mapped to when mapping to resource unit in first OFDM symbol that SPDCCH in short TTI is used.

Terminal possible Candidate Set in blind Detecting USS in each short TTI when demodulating, or directly existed using non-blinded fashion The resource location detection SPDCCH of determination.Polymerization grade only supports AL=1CCE and candidate in each short TTI during blind Detecting Collection supports 2.Now UE determines to detect original position in each short TTI according to the C-RNTI values of oneself.If first position Put is not that the SPDCCH of oneself then continues to detect in next Candidate Set position.

Y_k=(AY_k-1)mod D

Y_-1=n_RNTI≠ 0, A=39827, D=65537and k=n_TTI。

For non-blinded fashion, terminal is detected in the short TTI that base station is configured in SPDCCH, such as base station configuration 10ms The wherein 10 short TTI that detection is determined in 70 short TTI altogether.And the position of determination is detected in some short TTI Put, for example, only detect the first Candidate Set position of search space, now L is fixed as 1, be according to UE ID or C-RNTI determination The SPDCCH of the terminal.

By the scheme of the present embodiment, by using SPDCCH in a tdm fashion in short TTI so that each short TTI is equal Down control channel can be used and implement simple, cost is that expense is larger.And maximum blind check is reduced while reducing time delay Number of times uses non-blinded fashion to reduce terminal complexity.

Preferred embodiment 2

Base station is sent to UE by SPDCCH bearing downlink control information, and above-mentioned SPDCCH is first X in short TTI The part frequency domain resource of OFDM symbol.The present embodiment is by taking NCP as an example, and now short TTI include 2 OFDM symbols, And mark off 7 short TTI in 1ms subframes with 2 OFDM symbols.Or according to 4-3-4-3 OFDM in 1ms subframes Symbolic construction marks off 4 short TTI.Or according to 4 OFDM symbols mark off 7 short TTI in 2ms subframes.

X OFDM symbol before SPDCCH regions are taken in system bandwidth, or (it is less than system band for short TTI bandwidth It is wide) in preceding X OFDM symbol.Wherein, if short TTI include N number of OFDM symbol, X≤N, the preferred values of X For 1.X values can be fixed or configured by base station.SPDCCH takes first OFDM symbol in short TTI.With short TTI Exemplified by 2 OFDM symbols, Figure 10 is to take OFDM in short TTI according to the SPDCCH of the preferred embodiment of the present invention The schematic diagram of the part resource of symbol, as shown in Figure 10, the bandwidth B andwidth that now short TTI are used are that system bandwidth is (complete Portion's resource is that short TTI users use) or a part for system bandwidth (legacy UE and short TTI users take respectively is A part of frequency domain resource during regiment commander is wide).The part frequency domain resource of X OFDM symbol before in base station configuration system bandwidth, or match somebody with somebody Put the part frequency domain resource for the preceding X OFDM symbol in short TTI bandwidth (being less than system bandwidth).Wherein, base station The configuration signal used is carried by SPCFICH.X OFDM symbol before SPCFICH channel bearing SCFI information is notified Part frequency domain resource, the mode of the channel occupancy resource location to punch transmission in the first OFDM symbol in short TTI, Use CCE or REG or the RE resource of fixed position.Wherein fixed position be continuous on frequency domain or discrete selection CCE or REG or RE resources.For example, taking frequency domain position numbers 3 minimum REG.Wherein, above-mentioned SPDCCH regions take The sPRB scopes that preceding X OFDM symbol part frequency domain resource is indicated specifically to take by SCFI using 2bit, from sPRB sequence numbers Minimum sPRB 0 starts, and takes the sPRB sequence numbers configured to base station, the sPRB sequence numbers of configuration preferably from set sPRB 19, SPRB 39, sPRB 79, sPRB 99 } (system bandwidth 20MHz) middle SPDCCH selected in the different short TTI of one configuration Frequency domain in first OFDM symbol taken.

The wherein resource overlapping with Legacy PDCCH, preferential Legacy PDCCH are used.

Base station side allows multiple SPDCCH in short TTI to be multiplexed and scramble when sending SPDCCH, be multiplexed with short TTI Middle multiplexing.During scrambling in units of short TTI or subframe, wherein scramble sequence initial value is determined based on TTI,Only differentiate between the scramble sequence of 7 difference TTI in 1ms, n_TTI=0,1 ..., 6.

Terminal possible Candidate Set in blind Detecting USS in each short TTI when demodulating, or directly existed using non-blinded fashion The resource location detection SPDCCH of determination.Polymerization grade only supports AL=1CCE and candidate in each short TTI during blind Detecting Collection supports 2.Now UE determines to detect original position in each short TTI according to the C-RNTI values of oneself.If first position Put is not that the SPDCCH of oneself then continues to detect in next Candidate Set position.Now in short TTI CCE quantity according to not With SCFI configurations it is different and different.

Y_k=(AY_k-1)mod D

Y_-1=n_RNTI≠ 0, A=39827, D=65537and k=n_TTI。

For non-blinded fashion, terminal detects SPDCCH in all short TTI.And detection is determined in short TTI Position, for example, only detect the first Candidate Set position of search space, and now L is fixed as 1, is determined according to UE ID or C-RNTI It is the SPDCCH of the terminal.And no longer carry out hash iteration, Y between TTI_k=n_RNTIAnd k=n_TTI.For SPDCCH 1 OFDM symbol part frequency domain position mode is taken, because the total CCE quantity of each TTI is different, then in two UE of TTI i Collision is not necessarily collided in TTI i+1.

By the scheme of the present embodiment, by using SPDCCH in short TTI with TDM optimal ways so that each short TTI Down control channel can be used and control overhead is controllable, the size in SPDCCH regions is configured by eNB.And when reducing Maximum blind check number of times is reduced while prolonging or uses non-blinded fashion to reduce terminal complexity.

Preferred embodiment 3

Base station is sent to UE by SPDCCH bearing downlink control information, and above-mentioned SPDCCH takes part in short TTI sPRB.The present embodiment is by taking NCP as an example, and now short TTI include 2 OFDM symbols, and in 1ms subframes with 2 OFDM symbol marks off 7 short TTI.Or marked off in 1ms subframes according to 4-3-4-3 OFDM symbol structure 4 short TTI.Or according to 4 OFDM symbols mark off 7 short TTI in 2ms subframes.

SPDCCH regions take part sPRB.So that short TTI is comprising 2 OFDM symbols as an example, now SPDCCH is minimum It is 1 XPRB to take unit, and search space configures XPRB set by base station.(XPRB implications are explained：If in short TTI with Dry sPRB composition XPRB, XPRB occupancy resource size is preferably identical with LTE PRB pair resource sizes, for example：N=2 When, 1XPRB=7sPRB.Or unified definition XPRB sizes, such as 1XPRB=10PRB.)

Terminal detects SPDCCH in each short TTI.The frequency domain position of detection be base station configure frequency domain position, for example with XPRB set are put comprising 2 XPRB and positioned at XPRB index 0 and 1.And in certain time length (such as 40ms), make With configuration identical XPRB set frequency domain positions, Figure 11 be SPDCCH in short TTI with SPDSCH frequency division multiplexing occupancy portion Divide the schematic diagram of sPRB resources.

Resource granularity, polymerization grade when now SPDCCH and EPDCCH take the ECCE resources in PRB set, search Space uses identical structure.The ECCE constituted using EREG as basic polymerization grade AL, a variety of AL=1,2,4,8, 16th, 24,32 it can use, specifically used polymerization grade is fixed or configured by base station.

To the sequence after scrambling, modulated using QPSK, layer is carried out using open/close precoding, or space diversity transmission mode Mapping and precoding.The SCCE (s) that SPDCCH is used in XPRB set is only finally mapped to when mapping to resource unit.

For non-blinded fashion, terminal detects SPDCCH in all short TTI.And detection is determined in short TTI Position, for example, only detect the first Candidate Set position of search space, and now L is fixed as 1, is determined according to UE ID or C-RNTI It is the SPDCCH of the terminal.And no longer carry out hash iteration, Y between TTI_k=n_RNTIAnd k=n_TTI。

By the scheme of the present embodiment, by using SPDCCH in short TTI in FDM modes so that each short TTI Flexibly to use down control channel and control overhead is controllable, the size in SPDCCH regions is configured by eNB.And when reducing Maximum blind check number of times is reduced while prolonging or uses non-blinded fashion to reduce terminal complexity.

In summary, the technical scheme of the embodiment of the present invention can reach following technique effect：Solve comprising less OFDM symbols Number the short TTI of new granularity in down control channel using problem simultaneously can reduce detection complexity, can be in the short TTI of new granularity In the case of corresponding obtain shorter RTT time delays, it is ensured that low time delay communication requirement.

In another embodiment, a kind of software is additionally provided, the software is used to perform above-described embodiment and preferred embodiment Described in technical scheme.

In another embodiment, a kind of storage medium is additionally provided, be stored with above-mentioned software in the storage medium, the storage Medium includes but is not limited to：CD, floppy disk, hard disk, scratch pad memory etc..

It should be noted that term " first ", " second " in description and claims of this specification and above-mentioned accompanying drawing etc. is to use In distinguishing similar object, without for describing specific order or precedence.It should be appreciated that the object so used is suitable Can be exchanged in the case of, so as to embodiments of the invention described herein can with except illustrate or describe herein those with Outer order is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that covering is non-exclusive to be included, For example, the process, method, system, product or the equipment that contain series of steps or unit be not necessarily limited to clearly to list that A little steps or unit, but may include not list clearly or for intrinsic its of these processes, method, product or equipment Its step or unit.

Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can use general calculating Device realizes that they can be concentrated on single computing device, or be distributed on the network that multiple computing devices are constituted, Alternatively, they can be realized with the executable program code of computing device, it is thus possible to be stored in storage device In performed by computing device, and in some cases, can be to perform shown or described step different from order herein Suddenly, they are either fabricated to each integrated circuit modules respectively or be fabricated to the multiple modules or step in them single Integrated circuit modules are realized.So, the present invention is not restricted to any specific hardware and software combination.

The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art For, the present invention can have various modifications and variations.Any modification within the spirit and principles of the invention, being made, etc. With replacement, improvement etc., it should be included in the scope of the protection.

Claims

1. a kind of determination method of down control channel, it is characterised in that including：

Terminal receives the down control channel of bearing downlink control information in short transmission time interval TTI, wherein, it is described under Row control channel is located at the first control area or the second control area, is located at the described first control in the down control channel During region, Candidate Set quantity of the down control channel in short TTI is less than or equal in long evolving system LTE The Candidate Set quantity of subframe, or each the short TTI Candidate Set quantity that the down control channel is included in X subframe Sum is less than or equal to the Candidate Set quantity of X subframe in LTE, and wherein X is positive integer, in the descending control letter When road is located at the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1.

2. according to the method described in claim 1, it is characterised in that the terminal receives bearing downlink in short transmission time interval TTI Before the down control channel of control information, methods described also includes：

The down control channel of the control area detection carrying Downlink Control Information in short TTI, wherein, the control Region processed includes at least one of：Containing many in first control area, the second control area, first control area Only containing a position candidate in individual position candidate, second control area.

3. method according to claim 2, it is characterised in that the control area detection bearing downlink control information in short TTI Down control channel, including：

4. method according to claim 2, it is characterised in that the control area detection carrying descending control in short TTI The down control channel of information, including：

Detected in all short TTI control area；Or

Detected in the short TTI in part control area, wherein, the short TTI in the part is determined in the following manner：Pass through base The configuration stood determines the short TTI in the part, wherein, the configuration signal configured by base station includes at least one of： System information block SIB, radio resource control RRC, Downlink Control Information DCI；Preset the short TTI in the part；Root The short of detection is determined according to cell ID ID or terminal iidentification UE ID or Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI is implicit TTI。

5. method according to claim 4, it is characterised in that methods described also includes：

When being detected in the second control area, the short PDCCH positions in short TTI test position and short TTI are by least Determine one of in the following manner：Determined by UE ID or C-RNTI；Indicate that DCI or RRC is indicated by descending control.

6. method according to claim 5, it is characterised in that when being indicated using DCI, passes through the DCI two-stages In the first order indicated, wherein, the first order includes：Publicly-owned or unchanged signaling bit domain, and second Level DCI test position, the first order DCI is located at the first control area, and the second level DCI is located at the second control Region.

7. method according to claim 6, it is characterised in that the first order DCI is located at first short in one group of short TTI In TTI, the second level DCI determines that the second level is located at one of them in one group of short TTI or many according to first order DCI Individual short TTI.

8. the method according to any one of claim 2 to 7, it is characterised in that the control area at least through in the following manner it One takes short TTI resources：

The control area is time-multiplexed with short Physical Downlink Shared Channel PDSCH, and takes X independent orthogonal frequency Point multiplexing OFDM symbol, wherein, short TTI includes N number of OFDM symbol, and X and N are positive integer, and X is less than Or equal to N；

The control area takes the part resource of X OFDM symbol, wherein, take OFDM symbol part resource Position is determined by the configuration signal being pre-configured with or base station is issued, and the configuration signal includes：High-level signaling system Short control format indicates CFI information in message blocks SIB or physical layer signaling；

The control area and short Physical Downlink Shared Channel PDSCH frequency division multiplexings, and take the short Physical Resource Block in part PRB resources；Wherein, take the short PRB resource locations in part be pre-configured with or configuration signal that base station is issued by way of It is determined that, configuration signal includes at least one of：The proprietary signaling radio resource control RRC of publicly-owned signaling SIB, UE of cell.

9. method according to claim 8, it is characterised in that the control area takes the part money of X OFDM symbol Source, including：

Part frequency domain resource is taken according to specified order to one of at least following frequency domain resource：Short PRB, XPRB, resource block Group RBG, wherein, the specified order includes：Taken since the appointed sequence number of the frequency domain resource to the frequency domain of configuration Resource sequence number, the XPRB is, with PRB composition XPRB M short, M is positive integer in short TTI；

One is selected in predefined S resource area by base station, and the resource area selected is configured to described Control area, wherein, each resource area includes multiple short PRB continuously or discontinuously in the S resource area, Resource area number S includes：2 E powers, wherein, E is positive integer.

10. method according to claim 8, it is characterised in that short CFI information is by short Physical Control Format Indicator Channel PCFICH Channel bearing, the mode of short PCFICH channel occupancies resource location includes：It is whole or first short in one group of short TTI In first OFDM symbol in TTI, punching transmission and the control channel unit CCE or resource element for using fixed position Set REG or resource block RE.

11. method according to claim 8, it is characterised in that the control area take the quantity of following resource for fixed value or By base station by specifying signaling to be configured：XPRB, short PRB, RBG, wherein, the specified signaling includes：SIB、 RRC, short CFI.

12. according to the method described in claim 1, it is characterised in that the short CCE that short PDCCH is used is included：2 short REG, Or 4 short REG, or 8 short REG, or 16 short REG, when short CCE is made up of short REG, choose identical The short REG at interval constitutes short CCE, or, the short CCE takes one or more short PRB.

13. method according to claim 12, it is characterised in that the short REG to the RE of occupancy with time domain after first frequency domain or The serial number of frequency domain is 0 to i after person elder generation time domain, and numbering identical resource block is chosen as a short REG, wherein, The short REG is remaining RE in addition to the RE that pilot tone takes in the short PRB or XPRB to the RE of occupancy.

14. according to the method described in claim 1, it is characterised in that when the down control channel is located at first control area, Each short TTI Candidate Set quantity determination mode at least includes one below：

In one group of short TTI, Candidate Set quantity is identical in each short TTI, and total Candidate Set of the X subframe according to division Quantity is determined；

Candidate Set described in the OFDM number pro rates that duration ratio or one group of short TTI according to one group of short TTI are included Quantity；

15. according to the method described in claim 1, it is characterised in that when the down control channel is located at second control area, Short PDCCH test position is determined according to UE ID or C-RNTI in short TTI, wherein, at least through in the following manner One of determine the test position：

Determine first Candidate Set as the uniquely test position, and one group of short TTI in search space in short TTI The first Candidate Set position of middle determination is identical；

The short PDCCH takes the resource of fixed size as the test position, wherein, the test position is predefined Or determined by RRC signaling.

16. according to the method described in claim 1, it is characterised in that the short TTI of different terminals takes different short PRB or different OFDM symbol.

17. according to the method described in claim 1, it is characterised in that the corresponding polymerization grade of the down control channel includes：It is fixed One or more polymerization grades, one or more polymerization grades for being configured by base station, wherein, the polymerization grade is selected from collection Close L={ 1,2,4,8,16,24,32 }.

18. according to the method described in claim 1, it is characterised in that

When the down control channel is multiplexed and scrambled in short TTI, scramble sequence initial value is at least through short TTI sequence numbers It is determined, wherein, short TTI sequence numbers at least include one below：Sequence number in sequence number in 1ms subframes, radio frames.

19. a kind of determination method of down control channel, it is characterised in that including：

Base station by the down control channel in short transmission time interval TTI to terminal transmission Downlink Control Information, wherein, The down control channel is located at the first control area or the second control area, is located at described the in the down control channel During one control area, Candidate Set quantity of the down control channel in short TTI is less than or equal to long evolving system The Candidate Set quantity of subframe in LTE, or each the short TTI candidate that the down control channel is included in X subframe Collect the Candidate Set quantity that quantity sum is less than or equal to X subframe in LTE, wherein X is positive integer, described descending When control channel is located at the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1.

20. a kind of determining device of down control channel, applied to terminal, it is characterised in that including：

Receiving module, the down control channel for receiving bearing downlink control information in short transmission time interval TTI, its In, the down control channel is located at the first control area or the second control area, is located at institute in the down control channel When stating the first control area, Candidate Set quantity of the down control channel in short TTI is less than or equal to Long Term Evolution The Candidate Set quantity of subframe in system LTE, or each short TTI for being included in X subframe of the down control channel Candidate Set quantity sum is less than or equal to the Candidate Set quantity of X subframe in LTE, and wherein X is positive integer, described When down control channel is located at the second control area, Candidate Set quantity of the down control channel in short TTI is equal to 1.

21. a kind of determining device of down control channel, applied to base station, it is characterised in that including：

Transport module, for being believed by the down control channel in short transmission time interval TTI to the descending control of terminal transmission Breath, wherein, the down control channel is located at the first control area or the second control area, in the down control channel During positioned at first control area, Candidate Set quantity of the down control channel in short TTI is less than or equal to length The Candidate Set quantity of subframe in phase evolution system LTE, or the down control channel included in X subframe each is short TTI Candidate Set quantity sum is less than or equal to the Candidate Set quantity of X subframe in LTE, and wherein X is positive integer, When the down control channel is located at the second control area, Candidate Set quantity of the down control channel in short TTI Equal to 1.

22. a kind of terminal, it is characterised in that including：Device described in claim 20.

23. a kind of base station, it is characterised in that including：Device described in claim 21.