CN105472757A - Device-to-device (D2D) communication scheduling method and equipment thereof - Google Patents
Device-to-device (D2D) communication scheduling method and equipment thereof Download PDFInfo
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Abstract
The invention discloses a device-to-device (D2D) communication scheduling method and equipment thereof. The D2D communication scheduling method comprises the steps of determining a digital copyright identifier (DCI) format of local cell scheduling D2D communication by user equipment (UE) according to a duplexing manner of a cell; and then according to the DCI format, performing blind testing on a physical downlink control channel (PDCCH) and/or enhanced physical downlink control channel (EPDCCH) which schedules D2D communication in a corresponding searching space. The invention further provides a method for performing time domain resource format transmission. The D2D communication scheduling method can determine the DCI format of the PDCCH/EPDCCH which schedules D2D communication in a long-term evolution (LTE) system, thereby acquiring scheduling information of D2D communication in a defined DCI format and furthermore realizing D2D communication.
Description
Technical field
The present invention relates to wireless communication technology field, particularly a kind of equipment is to the dispatching method of equipment (Device-to-Device, D2D) data and dispatching distribution (SchedulingAssignment, SA) and equipment.
Background technology
Long Term Evolution (LTE) system supports Frequency Division Duplexing (FDD) (FDD) and time division duplex (TDD) two kinds of duplex modes.Fig. 1 is the frame structure schematic diagram of existing TDD system.As shown in the figure, the length of each radio frames is 10ms, and it is divided into two length is the field of 5ms.Each field comprises the time slot and 3 special domain that 8 length are 0.5ms, i.e. descending pilot frequency time slot (DwPTS), protection interval (GP) and uplink pilot time slot (UpPTS), and the length sum of these 3 special domain is 1ms.Each subframe is made up of two continuous print time slots, and namely a kth subframe comprises time slot 2k and time slot 2k+1.TDD system supports 7 kinds of different TDD upstream and downstream configurations, as shown in table 1.In table 1, D represents descending sub frame, and U represents sub-frame of uplink, and S represents the above-mentioned special subframe comprising 3 special domain.
The upstream and downstream configuration of table 1:LTETDD
The TDD system of LTE supports hybrid automatic repeat-request (HybridAutomaticRepeatRequest, HARQ) mechanism, its general principle comprises: base station is subscriber equipment (UserEquipment, UE) distribute ascending resource, UE utilizes ascending resource to send upstream data to base station.Base station receives upstream data and sends HARQ indication information to UE, and UE carries out the re-transmission of upstream data according to this indication information.Particularly, UE is by Physical Uplink Shared Channel (PhysicalUplinkSharedChannel, PUSCH) upstream data is carried, base station is by Physical Downlink Control Channel (PDCCH, PhysicalDownlinkControlChannel) or strengthen Physical Downlink Control Channel (EPDCCH, EnhancedPhysicalDownlinkControlChannel) the scheduling and controlling information of PUSCH is carried, i.e. uplink authorization (ULGrant), base station is by physical mixing retransmission indicating chanel (PHICH, PhysicalHARQIndicationChannel) HARQ indication information is carried.In above process, the determination of the timing position that PUSCH once transmits and follow-up re-transmission timing position is based on pre-configured timing relationship, comprise the timing relationship of the timing relationship of ULGrant to PUSCH, the timing relationship of PHICH to PUSCH and PUSCH to PHICH, in the application, above-mentioned three timing relationships are collectively referred to as PUSCH synchronous HARQ timing relationship.
First, the timing relationship of ULGrant in LTE and LTE-A or PHICH to PUSCH is introduced.
For FDD configuration, UE receives ULGrant or PHICH at descending sub frame n (n is subframe sequence number, lower same), then this ULGrant is used for the PUSCH in dispatching uplink subframe n+k.Here the value of k equals 4.
To the timing relationship of ULGrant to PUSCH, suppose that UE receives ULGrant at descending sub frame n (n is subframe sequence number, lower same), then this ULGrant is used for the PUSCH in dispatching uplink subframe n+k.Here the value of k defines in table 2.Specifically, concerning TDD upstream and downstream configuration 1 ~ 6, the quantity of sub-frame of uplink is less than or equal to descending sub frame (S frame can be used as descending sub frame), for any descending sub frame n, can by a unique k value, configure unique PUSCH synchronous HARQ timing relationship, reflection in table 2.Can not PUSCH be dispatched in a descending sub frame, or the PUSCH in a sub-frame of uplink can only be dispatched.And concerning TDD upstream and downstream configuration 0, the quantity of sub-frame of uplink is greater than descending sub frame, the PDCCH/EPDCCH of each descending sub frame needs the PUSCH in scheduling two sub-frame of uplink, for this reason, k value can not be unique, need the PUSCH supported in PDCCH/EPDCCH line index (ULindex) technology in scheduling two sub-frame of uplink, for the PUSCH that index is different, use different k values.Such as, when UE receives PDCCH/EPDCCH at descending sub frame 0, its scheduling be PUSCH in sub-frame of uplink 4 and/or sub-frame of uplink 7; When UE receives PDCCH/EPDCCH at descending sub frame 1, its scheduling be PUSCH in sub-frame of uplink 7 and/or sub-frame of uplink 8.
To the timing relationship of PHICH to PUSCH, in LTE and LTE-A, the PHICH resource collection for the PUSCH independent allocation in each sub-frame of uplink, suppose that UE receives PHICH at descending sub frame n, then this PHICH is for controlling the PUSCH in sub-frame of uplink n+j.Here the value of j defines in table 2.Specifically, concerning TDD upstream and downstream configuration 1 ~ 6, the quantity of sub-frame of uplink is less than or equal to descending sub frame, for any descending sub frame n, by a unique j value, unique PUSCH synchronous HARQ timing relationship can be configured, reflect in table 2, PHICH resource collection can not be configured in a descending sub frame, or the PHICH resource collection of a sub-frame of uplink can only be configured; Concerning TDD upstream and downstream configuration 0, the quantity of sub-frame of uplink is greater than descending sub frame, then j value is not unique, but be configured with two PHICH resource collection respectively at descending sub frame 0 and 5, i.e. PHICH resource 0 and PHICH resource 1, for different PHICH resource, uses different j values.Such as, when UE receives PHICH at descending sub frame 0, the PUSCH in sub-frame of uplink 4 and/or sub-frame of uplink 7 can be triggered.
The timing relationship table of table 2:UL-Grant/PHICH to PUSCH
Secondly, the timing relationship of PUSCH to the PHICH in LTE and LTE-A is introduced.
FDD is configured, when UE receives PHICH in descending sub frame n, hybrid automatic repeat-request response (HybridAutomaticRepeatRequestAcknowledge, HARQ-ACK) information of what this PHICH indicated is PUSCH in sub-frame of uplink n-h, the value of h equals 4.
Concerning TDD upstream and downstream configuration 1 ~ 6, when UE receives PHICH in descending sub frame n, the HARQ-ACK information of what this PHICH indicated is PUSCH in sub-frame of uplink n-h, the value of h is as shown in table 3.
Concerning TDD upstream and downstream configuration 0, owing to being configured with two PHICH resource, then when the PHICH resource 0 of UE in descending sub frame n receives PHICH, this PHICH indicates the HARQ-ACK information of the PUSCH in sub-frame of uplink n-h; And when UE receives PHICH in the PHICH resource 1 of descending sub frame 0 or descending sub frame 5, then this PHICH is the HARQ-ACK information of the PUSCH in instruction sub-frame of uplink n-6.
The timing relationship table of table 3:PUSCH to PHICH
The form of three kinds of timing relationships according to table 2 and table 3, PUSCH synchronous HARQ timing relationship when community (Cell) adopts a certain specific T DD upstream and downstream to configure can be determined, thus realize the synchronous transmission of PUSCH according to this PUSCH synchronous HARQ timing relationship.
Be sent to UE Physical Downlink Shared Channel (PhysicalDownlinkSharedChannel, PDSCH) or from UE transmission PUSCH can be dynamic dispatching or semi-continuous scheduling (SPS).The PDSCH of dynamic dispatching or semi-continuous scheduling or PUSCH transmission parameter are provided by the Downlink Control Information (DownlinkControlInformation, DCI) transmitted in PDCCH/EPDCCH.The DCI format of scheduling PDSCH transmission is called as DLDCI form, and the DCI format of dispatching PUSCH transmission is called as ULDCI form.In order to reduce the number of times of DCI blind detection, the DCI format 1A of scheduling PDSCH transmission and the information bit of DCI format 0 when blind check dispatching PUSCH transmission are the same.
For TDD system, DLDCI comprises descending allocation index (DAI) territory of 2 bits, DLDAI is the counter that community evolution base station (eNB) sends to UE, is used to refer to the number sum that eNB has dispatched the PDCCH/EPDCCH that the number of the PDCCH/EPDCCH of PDSCH and descending semi-continuous scheduling (SPS) discharge in bundled window.In first DLDCI that eNB sends in bundled window, the value of DAI is the value of DAI in second DLDCI sending in bundled window of 1, eNB is 2, by that analogy.Use the value of DLDAI field, UE can judge whether it has missed the DLDCI form in same bundled window above, and can determine the HARQ-ACK feedback information of the same window according to whether having DLDCI to lose.For TDD upstream and downstream configuration 1,2,3,4,5 or 6, the ULDCI form 0/4 of scheduling PUSCH comprises the ULDAI field of 2 bits, instruction be the number of sub frames sum of the PDCCH/EPDCCH transmitting the number of sub frames of PDSCH and the release of descending semi-continuous scheduling in current bundled window, be used for transmitting HARQ-ACK feedback information in PUSCH time determine the bit number of HARQ-ACK.For TDD upstream and downstream configuration 0, the ULDCI form 0/4 of scheduling PUSCH comprises the ULindex field of 2 bits, be used to refer to a descending sub frame when dispatching the PUSCH of 2 sub-frame of uplink, the PUSCH of PUSCH or 2 subframe of scheduling 1 subframe, and when the PUSCH of scheduling 1 subframe, scheduling be the PUSCH of which subframe.
Equipment under LTE MPS process also can take ascending resource to equipment (Device-to-Device, D2D) communication, and namely D2D communication takies the up-link carrier of FDD community or the sub-frame of uplink of TDD cell.D2D for pattern 1 communicates, also dispatch to be sent to UE (this dispatch is called D2Dgrant) by eNB, scheduling D2D data and dispatching distribution (SchedulingAssignment, SA), PDCCH/EPDCCH is adopted to dispatch, use the D2DRNTI different with the C-RNTI of scrambling when dispatching PUSCH to carry out scrambling, the bit number of PDCCH/EPDCCH is identical with the bit number of DCI format 0, and the bit number of DCI format 0 is as shown in table 4.
Each territory of table 4:DCI form 0 and bit number thereof
| DCI domain name | FDD | TDD |
| Form 0 and form 1A distinguish bit | 1 | 1 |
| Frequency hopping indicates | 1 | 1 |
| Frequency domain resource indicates | See 3GPP36.212 agreement | See 3GPP36.212 agreement |
| Modulation and Coding Scheme (MCS) | 5 | 5 |
| New data instruction (NDI) | 1 | 1 |
| Transmitting power control (TPC) | 2 | 2 |
| DMRS cyclic shift (Cyclic shift for DMRS) | 3 | 3 |
| CQI request (CQI request) | 1 | 1 |
| UL index | 0 | 2 (TDD uplink-downlink configuration 0) |
| UL DAI | 0 | 2 (TDD uplink-downlink configuration 1-6) |
As can be seen from Table 4, ULDAI territory or ULindex territory is not needed in PDCCH/EPDCCH during scheduling D2D communication, and for FDD system and TDD system, some territory in DCI format 0 is different, in LTE system, how to determine that TDD and the DCI format of dispatching the PDCCH/EPDCCH that D2D communicates in FDD system are technical problems urgently to be resolved hurrily.
Summary of the invention
In view of this, the dispatching method that the embodiment of the present invention provides a kind of D2D to communicate and equipment, the method and equipment can determine the DCI format of the PDCCH/EPDCCH dispatching D2D communication in LTE system, thus adopt the PDCCH/EPDCCH of the DCI format scheduling D2D communication determined.
Present invention also provides one and carry out the method that time-domain resource format transmission (T-RPT) indicates, under various D2D communication pattern, correctly can carry out T-RPT instruction.
According to above-mentioned purpose, the present invention is achieved in that
The dispatching method that a kind of equipment that the application provides communicates to equipment D2D, comprising:
User equipment (UE), according to the duplex mode of community, determines the Downlink Control Information DCI format that this cell scheduling D2D communicates;
UE, according to described DCI format, dispatches the physical downlink control channel PDCCH of D2D communication and/or the Physical Downlink Control Channel EPDCCH of enhancing in the blind check of corresponding search volume.
Preferably, the bit number of the DCI format of described D2D communication is identical with the bit number of the DCI format 0 of TDD cell scheduling Physical Uplink Shared Channel PUSCH;
Described PDCCH and/or EPDCCH in corresponding search volume blind check scheduling D2D communication comprises:
If the duplex mode of community is TDD, UE PDCCH and/or EPDCCH that only blind check scheduling D2D communicates on the peculiar search volume of UE, or, PDCCH and/or EPDCCH that UE communicates with blind check scheduling D2D on public search space in the peculiar search volume of UE;
If the duplex mode of community is FDD, UE PDCCH and/or EPDCCH that only blind check scheduling D2D communicates on the peculiar search volume of UE.
Preferably, the method comprises further:
Power control is carried out with transmitting power control TPC territory in the upstream and downstream allocation index ULDAI or the upper line index ULindex territory that correspond to described DCI format 0 in the DCI format that UE communicates according to described D2D, and indicate NDI territory according to the differentiation territory of form in described DCI format 00 and form 1A, new data, demodulated reference signal cyclic shift CyclicshiftforDMRS territory, CQI request CQIrequest territory obtain resource format and transmit RPT and indicate;
Or, correspond to ULDAI or the ULindex territory of described DCI format 0 in the DCI format that UE communicates according to described D2D, the differentiation territory of form 0 and form 1A, NDI territory, CyclicshiftforDMRS territory, CQIrequest territory obtain resource format and transmit RPT and indicate.
Preferably, if the duplex mode of community is TDD, the bit number of the DCI format of described D2D communication is identical with the bit number that TDD cell dispatches the DCI format 0 of PUSCH;
If the duplex mode of community is FDD, the bit number of the DCI format of described D2D communication is identical with the bit number of the DCI format 0 of FDD cell scheduling PUSCH.
Preferably, if the duplex mode of community is TDD, the method comprises further:
Power control is carried out with TPC territory in ULDAI or the ULindex territory corresponding to described DCI format 0 in the DCI format that UE communicates according to described D2D, and obtains resource format according to the differentiation territory of form in described DCI format 00 and form 1A, NDI territory, CyclicshiftforDMRS territory, CQIrequest territory and transmit RPT and indicate;
Or, correspond to ULDAI or the ULindex territory of described DCI format 0 in the DCI format that UE communicates according to described D2D, the differentiation territory of form 0 and form 1A, NDI territory, CyclicshiftforDMRS territory, CQIrequest territory obtain resource format and transmit RPT and indicate;
Or, in the DCI format that UE communicates according to described D2D
bit obtains the instruction of dispatching distribution SA resource, according to
bit obtains time domain or the instruction of frequency domain resource position of dispatching D2D data; Wherein, N is the bit number that SA resource pool comprises, and K is the Physical Resource Block logarithm that each SA comprises;
Or, correspond to ULDAI or the ULindex territory of described DCI format 0 in the DCI format that described D2D communicates by UE as reservation bit, and obtain resource format according to the differentiation territory of form in described DCI format 00 and form 1A, NDI territory, CyclicshiftforDMRS territory, CQIrequest territory and transmit RPT and indicate.
Preferably, if the duplex mode of community is FDD, the method comprises further:
UE obtains resource format according to the differentiation territory of form in described DCI format 00 and form 1A, NDI territory, CyclicshiftforDMRS territory, CQIrequest territory and transmits RPT and indicate;
Or, in the DCI format that UE communicates according to described D2D
bit obtains the instruction of SA resource, according to
bit obtains time domain or the instruction of frequency domain resource position of dispatching D2D data; Wherein, N is the bit number that SA resource pool comprises, and K is the Physical Resource Block logarithm that each SA comprises.
Preferably, PDCCH and/or EPDCCH of described blind check scheduling D2D communication comprises:
UE, at PDCCH and/or EPDCCH of all descending sub frame blind check scheduling D2D communication, obtains D2Dgrant;
Or PDCCH and/or EPDCCH that UE communicates at the descending sub frame blind check scheduling D2D that may dispatch PUSCH, obtains D2D and authorizes grant.
Preferably, the method comprises further:
UE after the subframe of D2Dgrant place and and the interval of described subframe first D2D subframe being more than or equal to L millisecond send first SA that described D2Dgrant dispatches in time;
Or, UE after the subframe of D2Dgrant place and and the interval of described subframe be more than or equal to D2D subframe that first of L millisecond be configured with SA resource pool and send first SA that described D2Dgrant dispatches in time;
Wherein, L nonnegative integral value.
Preferably, PDCCH and/or EPDCCH of described blind check scheduling D2D communication comprises:
If subframe n+k is D2D subframe, UE, at the D2Dgrant of descending sub frame n blind check scheduling D2D communication, if UE detects the D2Dgrant of scheduling D2D communication at descending sub frame n, then sends at subframe n+k first SA that described D2Dgrant dispatches in time;
Or, if subframe n+k is configured with SA resource pool, UE, at the D2Dgrant of descending sub frame n blind check scheduling D2D communication, if UE detects the D2Dgrant of scheduling D2D communication at descending sub frame n, then sends at subframe n+k first SA that described D2Dgrant dispatches in time.
Preferably, if the duplex mode of community is FDD, then k=4;
If the duplex mode of community is TDD, and TDD is followed in described community those in subordinate positions will follow the example set by their superiors configuration 1-6, then the value of k is determined according to table 2:
Table 2
Preferably, if the duplex mode of community is TDD, and TDD is followed in described community those in subordinate positions will follow the example set by their superiors configuration 0:
The many subframe scheduling instructions of D2D are obtained according to the ULindex territory in D2Dgrant;
Or, the value of k is determined according to table 5 or table 6:
Table 5
Table 6
Or, the value of k is determined according to table 2 and D2D sub-frame configuration:
Table 2
Describedly determine that the value of k comprises according to table 2 and D2D sub-frame configuration: if two sub-frame of uplink n+k that descending sub frame n may dispatch
1and n+k
2in only have a sub-frame of uplink n+k
mbe D2D subframe or only have a sub-frame of uplink to be configured with SA resource pool, m=1 or 2, then described first SA is at subframe n+k
msend; If described two sub-frame of uplink n+k
1and n+k
2be all D2D subframe or be all configured with SA resource pool, so, first SA is at subframe n+k
msend, k
mk
1, k
2in minimum value.
Present invention also provides a kind of method of carrying out time-domain resource format transmission T-RPT and indicating, comprising:
By the subframe in the SA resource pool of the time index instruction D2D communication pattern 2 in T-RPT;
If D2D communication pattern 1 exists SA resource pool, by the subframe in the SA resource pool of the time index instruction D2D communication pattern 1 in T-RPT;
If D2D communication pattern 1 does not exist SA resource pool and there is the D2D data burst of D2D communication pattern 1, with the D2D data burst of the time index instruction D2D communication pattern 1 in T-RPT;
If D2D communication pattern 1 does not exist SA resource pool and there is not the D2D data burst of D2D communication pattern 1, with the time index instruction sub-frame of uplink in T-RPT.
Preferably, the time index original position of D2D transfer of data indicated for D2D communication pattern 2, T-RPT is the subframe of the SA resource pool of first D2D communication pattern 2 after the subframe of transmission first SA;
The time index original position of D2D transfer of data indicated for the D2D communication pattern 1, T-RPT that there is SA resource pool is the subframe of the SA resource pool of first D2D communication pattern 1 after the subframe of transmission first SA;
For there is not SA resource pool and the time index original position of D2D transfer of data that the D2D communication pattern 1, T-RPT that there is D2D data burst indicates is the D2D subframe of first D2D communication pattern 1 after the subframe of transmission first SA;
For there is not SA resource pool and and the time index original position of D2D transfer of data that the D2D communication pattern 1, T-RPT that there is D2D data burst indicates is first sub-frame of uplink after the subframe of transmission first SA.
Preferably, the time index original position for the D2D transfer of data of D2D communication pattern 2, T-RPT instruction is the subframe that in the subframe of multiple transmission SA, last transmits the SA resource pool of first D2D communication pattern 2 after the subframe of SA;
The time index original position of D2D transfer of data indicated for the D2D communication pattern 1, T-RPT that there is SA resource pool is the subframe of the SA resource pool of first D2D communication pattern 1 after the subframe of last transmission SA in the subframe of multiple transmission SA;
For there is not SA resource pool and the time index original position of D2D transfer of data that the D2D communication pattern 1, T-RPT that there is D2D data burst indicates is the D2D subframe of first D2D communication pattern 1 after the subframe of last transmission SA in the subframe of multiple transmission SA;
For there is not SA resource pool and and the time index original position of D2D transfer of data that the D2D communication pattern 1, T-RPT that there is D2D data burst indicates is first sub-frame of uplink after the subframe of last transmission SA in the subframe of multiple transmission SA.
Present invention also provides a kind of equipment, comprising: format determination module and blind check module, wherein:
Described format determination module, for the duplex mode according to community, determines the DCI format that this cell scheduling D2D communicates;
Described blind check module, for according to described DCI format, at the physical downlink control channel PDCCH of corresponding search volume blind check scheduling D2D communication and/or the Physical Downlink Control Channel EPDCCH of enhancing.
As can be seen from the above scheme, first embodiment of the present invention UE determines according to the duplex mode of community the DCI format that this cell scheduling D2D communicates, then UE is according to the DCI format of scheduling D2D communication, obtains corresponding D2Dgrant at the PDCCH/EPDCCH of corresponding search volume blind check scheduling D2D communication.Therefore, the embodiment of the present invention can determine the DCI format of dispatching D2D communication in LTE system, thus adopts the DCI format determined to obtain the schedule information of D2D communication, and then realizes D2D communication.
Accompanying drawing explanation
Fig. 1 is the frame structure schematic diagram of existing TDD system;
Fig. 2 is the dispatching method flow chart of a kind of D2D communication of the present invention;
Fig. 3 is the schematic diagram of HARQ-ACK timing relationship in the embodiment of the present invention one;
Fig. 4 is the schematic diagram of D2D scheduling timing relation one in embodiment of the present invention example three;
Fig. 5 is the schematic diagram of D2D scheduling timing relation two in embodiment of the present invention example three;
Fig. 6 is the schematic diagram of D2D scheduling timing relation three in embodiment of the present invention example three;
Fig. 7 is the schematic diagram of D2D scheduling timing relation four in embodiment of the present invention example three;
Fig. 8 is the schematic diagram of D2D scheduling timing relation five in embodiment of the present invention example three;
Fig. 9 is the schematic diagram of D2D scheduling timing relation six in embodiment of the present invention example three;
The schematic diagram of the original position one of the time index of the D2D transfer of data that Figure 10 provides for the embodiment of the present invention four;
The schematic diagram of the original position two of the time index of the D2D transfer of data that Figure 11 provides for the embodiment of the present invention four;
The composition structural representation of a kind of terminal that Figure 12 provides for the embodiment of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in further detail.
Fig. 2 is the dispatching method flow chart of a kind of D2D communication of the present invention.For convenience, if UE is in some subframes transmitting-receiving D2D data, then concerning this UE, the subframe of carrying D2D data is called D2D subframe, and its concrete steps are:
Step 201:UE, according to the duplex mode of community, determines the DCI format that this cell scheduling D2D communicates;
Step 202:UE, according to described DCI format, dispatches PDCCH and/or EPDCCH of D2D communication in the blind check of corresponding search volume.
D2D communication be the equipment that carries out between two UE to the communication of equipment, two UE are called UE and the D2D data receiver UE sending D2D data." scheduling D2D communication " comprising: base station sends D2Dgrant to the UE sending D2D data, D2Dgrant indicates the control information of SA and D2D transfer of data, the UE sending D2D data sends to D2D data receiver UE by SA the control information of D2D transfer of data, and the control information that D2D data receiver UE indicates according to SA receives D2D data.
Below by several preferred embodiment, the DCI format that different situations dispatching D2D communicates and the method for dispatching the PDCCH/EPDCCH that D2D communicates in the blind check of corresponding search volume are described respectively.
Embodiment one:
The present embodiment is supposed: the bit number of the DCI format of scheduling D2D communication is identical with the bit number of the DCI format 0 of scheduling PUSCH.
1, the bit number of the DCI format of the present embodiment scheduling D2D communication is described.
The present embodiment proposes the DCI format that a kind of unified scheduling D2D communicates, that is: no matter be in TDD cell configuration D2D subframe, or FDD community cell configuration D2D subframe, the DCI format that the scheduling D2D that the present embodiment can be used to provide communicates.
For the TDD cell being configured with D2D subframe, the PUSCH of scheduling TDD cell adopts the DCI format 0 of TDD definition, according to table 4, the DCI format 0 of the PUSCH of the community of scheduling TDD upstream and downstream configuration 0 comprises the ULIndex territory of 2 bits, and the DCI format 0 of the PUSCH of the community of scheduling TDD upstream and downstream configuration 1,2,3,4,5 or 6 comprises the ULDAI territory of 2 bits.
For the FDD community being configured with D2D subframe, if the subframe A of FDD community is D2D subframe, and D2D subframe A is not used in the HARQ-ACK information of the PDSCH of transmission descending sub frame A-4, arrange in the present embodiment: the sub-frame of uplink A1 of 1st the non-D2D subframe of HARQ-ACK information after D2D subframe A of the PDSCH of descending sub frame A-4 transmits, simultaneously, the HARQ-ACK information of the PDSCH of descending sub frame A1-4 is transmitted at sub-frame of uplink A1, as shown in Figure 3, Fig. 3 is the schematic diagram of HARQ-ACK timing relationship in the embodiment of the present invention one.Because the number of sub frames of the HARQ-ACK information transmitting PDSCH in sub-frame of uplink A1 is greater than 1, therefore dispatch at descending sub frame A-4 and descending sub frame A1-4 in the DLDCI of the PDCCH of PDSCH and should comprise DLDAI territory, and HARQ procedure number field is 4 bits.ULDAI territory should be comprised in the ULDCI of the PDCCH of the PUSCH of descending sub frame A-4 and descending sub frame A1-4 dispatching uplink subframe A and A1.In fact this mode changes the timing relationship of HARQ-ACK feedback in FDD community.
According to above-mentioned analysis, if there is D2D subframe in FDD system, then the bit number that needs of descending DCI and up DCI format 0 is identical with the bit number of the DCI required for TDD system.Therefore, in the present embodiment, the DCI format of scheduling D2D communication is identical with the bit number of TDDDCI form 0.
2, the structure of the DCI format of the present embodiment scheduling D2D communication is described.
As previously mentioned, for the TDD cell or the FDD community that are configured with D2D subframe, the bit number of the DCI format of the D2D communication on scheduling FDD community is identical with the bit number of the DCI format that the D2D in scheduling TDD cell communicates, and namely designs according to the bit number of TDDDCI form 0.So, 2 bits in ULDAI/ULindex territory are wherein idle, and for 2 bits of this free time, the present embodiment provides following several Application way:
1) 2 bits in ULDAI or ULindex territory can be used for carrying out the control of enhancing power, and namely totally 4 bits are as power control bit together with 2 bits of TPC for 2 bits in ULDAI or ULindex territory, and UE carries out power control according to described power control bit.Now, in DCI format 0 differentiation territory 1 bit of form 0 and form 1A, NDI territory 1 bit, CyclicshiftforDMRS territory 3 bit, CQIrequest territory 1 bit totally 6 bits transmit (ResourcePatternsforTransmission, RPT) as resource format and indicate.
2) using differentiation territory 1 bit of form in 2 bits in ULDAI or ULindex territory and DCI format 00 and form 1A, NDI territory 1 bit, CyclicshiftforDMRS territory 3 bit, CQIrequest territory 1 bit totally 8 bits indicate as RPT.
3, the method for the PDCCH/EPDCCH of the present embodiment UE blind check scheduling D2D communication is described.
For the TDD cell being configured with D2D subframe, the present embodiment provides the method for the PDCCH/EPDCCH of two kinds of UE blind check scheduling D2D communication, is respectively:
First method: the ULDCI of the peculiar search volume of ULDCI and UE due to public search space is TDD form, and bit number is identical, the PDCCH/EPDCCH that UE can communicate with blind check scheduling D2D on public search space in the peculiar search volume of UE;
Second method: owing to configuring for FDD, the UE PDCCH/EPDCCH that only blind check scheduling D2D communicates on the peculiar search volume of UE, in order to be consistent with FDD configuration, the PDCCH/EPDCCH of UE blind check scheduling D2D communication on the peculiar search volume of UE.
For the FDD community being configured with D2D subframe, because the ULDCI form 0 of public search space is identical with DLDCI form 1A bit number, UE detects DCI format 0 and DCI format 1A in public search space simultaneously.And public search space DLDCI form 1A may for multiple UE, this is comprising the backward UE not supporting D2D subframe, so the public search space DLDCI form 1A of FDD community can only adopt FDD form, in order to avoid the increase of UE blind check number of times, the ULDCI form 0 in public search space also can only adopt FDD form.
Therefore, identical with the bit number of TDDDCI form 0 at the bit number of the DCI format 0 of UE peculiar search volume scheduling PUSCH, to meet the uplink scheduling and the D2D dispatching requirement that there is the FDD system of D2D subframe, and in public search space, the bit number of DCI format 0 remains unchanged.For the FDD community being configured with D2D subframe, the UE PDCCH/EPDCCH that only blind check scheduling D2D communicates on the peculiar search volume of UE, the UE PDCCH that blind check scheduling D2D does not communicate on public search space.
For the TDD cell or the FDD community that are configured with D2D subframe, the DCI bit number of scheduling D2D communication is identical with the bit number of the DCI format 0 of scheduling PUSCH, can simplify the design of standard like this.Bit number according to TDDDCI form 0 designs, and because the bit number of TDDDCI form 0 is more than the bit number of FDDDCI form 0, the information that the DCI making scheduling D2D communicate like this indicates is more.
Embodiment two:
The present embodiment is supposed: the bit number of DCI (hereinafter referred D2DDCI) form of scheduling D2D communication is identical with the bit number of the DCI format 0 of scheduling PUSCH.
In existing 3GPP agreement, TDD system is different with the bit number of DCI format in FDD system 0.Wherein:
ULDCI in TDD system, that is: DCI format 0 comprises the ULIndex/ULDAI territory of 2 bits, when the TDD uplink-downlink configuration of community is configuration 0, this territory is interpreted as ULIndex, under other TDD uplink-downlink configuration, i.e. TDD upstream and downstream configuration 1,2,3,4,5 or 6, this territory is interpreted as ULDAI.The ULIndex/ULDAI territory of 2 bits is not comprised in DCI format 0 in FDD system.
TDD is not identical with the bit number of DCI format descending in FDD system yet, and in TDD system, descending DCI format comprises (comprising DCI format 1/1A/1B/1D/2/2A/2B/2C/2D) the DLDAI territory of 2 bits, and HARQ procedure number field is 4 bits; In FDD system, descending DCI format does not comprise the DLDAI territory of 2 bits, and HARQ procedure number field is 3 bits.
Therefore, if dispatch D2D communication by DCI format 0, then available in TDD system DCI bit number 2 bits more than FDD system.
Be given in the PDCCH/EPDCCH that D2DDCI is carried in the method for the content determining D2DDCI form in TDD system and FDD system and UE blind check below, in description, be called for short D2Dgrant method.
Method 1:
1) when the community that UE configures D2D subframe place is TDD duplex mode (that is: for the TDD cell being configured with D2D subframe), the content of D2DDCI form designs according to the bit number of TDDDCI form 0.Such as, 2 bits in ULindex/ULDAI territory can be used for strengthening power and control, namely 2 bits in ULindex/ULDAI territory together with 2 bits of TPC totally 4 bits as power control bit.Or in 2 bits in ULDAI or ULindex territory and DCI format 0 form 0 and form 1A distinguish territory 1 bit, NDI territory 1 bit, CyclicshiftforDMRS territory 3 bit, CQIrequest territory 1 bit totally 8 bits indicate as time-domain resource format transmission (TimeResourcePatternsforTransmission, T-RPT).Or suppose that the bit number that SA resource pool comprises is N, the Physical Resource Block logarithm that each SA comprises is K, then the bit number being used to indicate SA resource in D2Dgrant is
bit is used to indicate time domain or the frequency domain resource position of scheduling D2D data.
2) when the community that UE configures D2D subframe place is FDD duplex mode, the content of D2DDCI form designs according to the bit number of FDDDCI form 0.Such as, TPC territory is 2 bits, in DCI format 0 form 0 and form 1A distinguish territory 1 bit, NDI territory 1 bit, CyclicshiftforDMRS territory 3 bit, CQIrequest territory 1 bit totally 6 bits indicate as T-RPT.Or suppose that the bit number that SA resource pool comprises is N, the Physical Resource Block logarithm that each SA comprises is K, then the bit number being used to indicate SA resource in D2Dgrant is
bit is used to indicate time domain or the frequency domain resource position of scheduling D2D data.
Method 2:
1) when the community that UE configures D2D subframe place is TDD duplex mode, the content of D2DDCI form designs according to the bit number of FDDDCI form 0.Wherein: TPC territory is 2 bits, in DCI format 0 form 0 and form 1A distinguish territory 1 bit, NDI territory 1 bit, CyclicshiftforDMRS territory 3 bit, CQIrequest territory 1 bit totally 6 bits indicate as RPT, 2 bits in ULindex/ULDAI territory are as reservation bit.Or suppose that the bit number that SA resource pool comprises is N, the Physical Resource Block logarithm that each SA comprises is K, then the bit number being used to indicate SA resource in D2Dgrant is
bit is used to indicate time domain or the frequency domain resource position of scheduling D2D data.
2) when the community that UE configures D2D subframe place is FDD duplex mode, the content of D2DDCI form designs according to the bit number of FDDDCI form 0.Wherein: TPC territory is 2 bits, in DCI format 0 form 0 and form 1A distinguish territory 1 bit, NDI territory 1 bit, CyclicshiftforDMRS territory 3 bit, CQIrequest territory 1 bit totally 6 bits indicate as RPT.Or the bit number that SA resource pool comprises is N, to be the bit number being used to indicate SA resource in K, D2Dgrant be the Physical Resource Block logarithm that each SA comprises
bit is used to indicate time domain or the frequency domain resource position of scheduling D2D data.
Embodiment three:
The present embodiment is supposed: the bit number of the DCI format of scheduling D2D communication is identical with the bit number of the DCI format 0 of scheduling PUSCH.Provide the timing relationship of D2Dgrant place descending sub frame and D2D subframe corresponding with it below.
Method 1:
The D2Dgrant of the D2D transfer of data of scheduling different UEs, at all descending sub frame blind check D2Dgrant, can be dispersed in different descending sub frames, thus reduce the probability that D2Dgrant collision occurs by UE like this.Particularly:
D2Dgrant scheduling first SA be positioned at this D2Dgrant place subframe after and be more than or equal to L millisecond (such as with this sub-frame interval, L=4, or other nonnegative integral values, concrete L value by UE receive D2Dgrant to prepare SA send required for Time dependent) first D2D subframe, that is: UE sends first SA in this D2D subframe.Such as, for the community of following TDD upstream and downstream configuration 1, the D2Dgrant that UE communicates with special subframe blind check scheduling D2D at all descending sub frames, namely UE is at the D2Dgrant of subframe 0,1,4,5,6,9 blind check scheduling D2D communication, if UE detects D2Dgrant in subframe 6, if and subframe 3 is first D2D subframe of subframe 6 UE configuration afterwards, so, first SA that D2Dgrant is dispatched in time is positioned at subframe 3, as shown in Figure 4, Fig. 4 is the schematic diagram of D2D scheduling timing relation one in the embodiment of the present invention three.
Or, L millisecond is more than or equal to (such as after first SA that D2Dgrant is dispatched in time is positioned at this D2Dgrant place subframe with this sub-frame interval, L=4, or other nonnegative integral values, concrete L value by UE receive D2Dgrant to prepare SA send required for Time dependent) first subframe being configured with SA resource pool.Such as, for the community of following TDD upstream and downstream configuration 1, the D2Dgrant that UE communicates with special subframe blind check scheduling D2D at all descending sub frames, namely UE is at the D2Dgrant of subframe 0,1,4,5,6,9 blind check scheduling D2D communication, if UE detects D2Dgrant in subframe 6, if and subframe 3 is subframes of first SA resource pool of subframe 6 UE configuration afterwards, so, first SA that D2Dgrant is dispatched in time is positioned at subframe 3, as shown in Figure 5, Fig. 5 is the schematic diagram of D2D scheduling timing relation two in the embodiment of the present invention three.
Method 2:
UE may dispatch the descending sub frame blind check D2Dgrant of PUSCH, so only just detects D2Dgrant in the subframe of blind check PUSCH.Particularly:
L millisecond is more than or equal to (such as after first SA that D2Dgrant is dispatched in time is positioned at this D2Dgrant place subframe with this sub-frame interval, L=4, or other nonnegative integral values, concrete L value by UE receive D2Dgrant to prepare SA send required for Time dependent) first D2D subframe.Such as, for the community of following TDD upstream and downstream configuration 1, the D2Dgrant that UE communicates with special subframe blind check scheduling D2D at the descending sub frame may dispatching PUSCH, namely UE is at the D2Dgrant of subframe 1,4,6,9 blind check scheduling D2D communication, if UE detects D2Dgrant in subframe 6, if and subframe 3 is first D2D subframe of subframe 6 UE configuration afterwards, first SA that then D2Dgrant is dispatched in time is positioned at subframe 3, as shown in Figure 6, Fig. 6 is the schematic diagram of D2D scheduling timing relation three in the embodiment of the present invention three.
Or, L millisecond is more than or equal to (such as after first SA that D2Dgrant is dispatched in time is positioned at this D2Dgrant place subframe with this sub-frame interval, L=4, or other nonnegative integral values, concrete L value by UE receive D2Dgrant to prepare SA send required for Time dependent) first subframe being configured with SA resource pool.Such as, for the community of following TDD upstream and downstream configuration 1, the D2Dgrant that UE communicates with special subframe blind check scheduling D2D at the descending sub frame may dispatching PUSCH, namely UE is at the D2Dgrant of subframe 1,4,6,9 blind check scheduling D2D communication, if UE detects D2Dgrant in subframe 6, if and subframe 3 is subframes of first SA resource pool of subframe 6 UE configuration afterwards, first SA that D2Dgrant is dispatched in time is positioned at subframe 3, as shown in Figure 7, Fig. 7 is the schematic diagram of D2D scheduling timing relation four in inventive embodiments three.
Method 3:
Timing relationship between first SA that D2Dgrant and D2Dgrant is dispatched in time obeys the timing relationship of PUSCH, that is: if subframe n+k is D2D subframe, UE is at the D2Dgrant of descending sub frame n blind check scheduling D2D communication, if UE detects the D2Dgrant of scheduling D2D communication at descending sub frame n, then first SA sends at subframe n+k.Particularly:
For the community of FDD duplex mode, k=4.
For the community of TDD duplex mode, when this TDD cell follows TDD upstream and downstream configuration 1-6, the value of k is determined according to table 2.
For the community of TDD duplex mode, when this TDD cell follow TDD upstream and downstream configure 0 time, the present embodiment proposes following several processing mode:
1) when TDD cell follow TDD upstream and downstream configure 0 time, the value of k is determined according to table 2, and D2Dgrant comprises the ULindex territory of 2 bits, is used to refer to the many subframe schedulings of D2D.
2) when TDD cell follow TDD upstream and downstream configure 0 time, many subframe schedulings are not carried out in the scheduling for D2D subframe, do not comprise the ULindex territory of 2 bits, and the value of k are determined in D2Dgrant according to table 5.
The timing relationship table of table 5D2D-Grant to first SA
3) when TDD cell follow TDD upstream and downstream configure 0 time, many subframe schedulings are not carried out in the scheduling for D2D subframe, do not comprise the ULindex territory of 2 bits, and the value of k are determined in D2Dgrant according to table 6.
The timing relationship table of table 6D2D-Grant to first SA
4) when TDD cell follow TDD upstream and downstream configure 0 time, many subframe schedulings are not carried out in the scheduling for D2D subframe, do not comprise the ULindex territory of 2 bits in D2Dgrant, and the value of k determines according to table 2 and D2D sub-frame configuration.Particularly: each descending sub frame n (n=0,1,5,6) may dispatch the PUSCH of two sub-frame of uplink, if two sub-frame of uplink n+k that each descending sub frame n may dispatch
1and n+k
2in only have a sub-frame of uplink n+k
mbe D2D subframe, m=1 or 2, if UE detects the D2Dgrant of scheduling D2D communication at descending sub frame n, so, first SA is at subframe n+k
msend; If two sub-frame of uplink n+k that each descending sub frame n may dispatch
1and n+k
2be all D2D subframe, if UE detects the D2Dgrant of scheduling D2D communication at descending sub frame n, so, first SA is at subframe n+k
msend, k
mk
1, k
2in minimum value.
Like this, the time of D2Dgrant blind check can be reduced.Such as, for the community of TDD upstream and downstream configuration 1, subframe 3 is configured with D2D, the D2Dgrant that UE communicates with special subframe blind check scheduling D2D at the descending sub frame may dispatching D2D communication, namely UE is at the D2Dgrant of subframe 9 blind check scheduling D2D communication, if UE detects D2Dgrant in subframe 9, according to the timing relationship of PUSCH scheduling, first SA that D2Dgrant is dispatched in time is positioned at subframe 3, and as shown in Figure 8, Fig. 8 is the schematic diagram of D2D scheduling timing relation five in inventive embodiments three.
Timing relationship between first SA that D2Dgrant and D2Dgrant is dispatched in time obeys the timing relationship of PUSCH, that is: if subframe n+k is configured with SA resource pool subframe, UE is at the D2Dgrant of descending sub frame n blind check scheduling D2D communication, if UE detects the D2Dgrant of scheduling D2D communication at descending sub frame n, then first SA sends at subframe n+k.Particularly:
For the community of FDD duplex mode, k=4.
For the community of TDD duplex mode, when this TDD cell follows TDD upstream and downstream configuration 1-6, the value of k is determined according to table 2.
For the community of TDD duplex mode, when this TDD cell follow TDD upstream and downstream configure 0 time, the present embodiment proposes following several processing mode:
1) when TDD cell follow TDD upstream and downstream configure 0 time, the value of k is determined according to table 2, and D2Dgrant comprises the ULindex territory of 2 bits, is used to refer to the many subframe schedulings of D2D.
2) when TDD cell follow TDD upstream and downstream configure 0 time, many subframe schedulings are not carried out in the scheduling for D2D, do not comprise the ULindex territory of 2 bits, and the value of k are determined in D2Dgrant according to table 5.
3) when TDD cell follow TDD upstream and downstream configure 0 time, many subframe schedulings are not carried out in the scheduling for D2D, do not comprise the ULindex territory of 2 bits, and the value of k are determined in D2Dgrant according to table 6.
4) when TDD cell follow TDD upstream and downstream configure 0 time, many subframe schedulings are not carried out in the scheduling for D2D, do not comprise the ULindex territory of 2 bits in D2Dgrant, and the value of k is determined according to the configuration of SA resource pool in table 2 and D2D.Particularly: each descending sub frame n (n=0,1,5,6) may dispatch the PUSCH of two sub-frame of uplink, if two sub-frame of uplink n+k that each descending sub frame n may dispatch
1and n+k
2in only have a sub-frame of uplink n+k
mbe the subframe being configured with SA resource pool in D2D, m=1 or 2, if UE detects the D2Dgrant of scheduling D2D communication at descending sub frame n, so, first SA is at subframe n+k
msend; If two sub-frame of uplink n+k that each descending sub frame n may dispatch
1and n+k
2be all the subframe being configured with SA resource pool in D2D, if UE detects the D2Dgrant of scheduling D2D communication at descending sub frame n, so, first SA is in subframe
n+ k
msend, k
mk
1, k
2in minimum value.
Like this, the time of D2Dgrant blind check can be reduced.Such as, for the community of TDD upstream and downstream configuration 1, subframe 3 is configured with SA resource pool, and according to PUSCH scheduling timing relation, the descending sub frame may dispatching subframe 3 is subframe 9.The D2Dgrant that UE communicates with special subframe blind check scheduling D2D at the descending sub frame may dispatching D2D communication, namely UE is at the D2Dgrant of subframe 9 blind check scheduling D2D communication, if UE detects D2Dgrant in subframe 9, according to the timing relationship of PUSCH scheduling, first SA that D2Dgrant is dispatched in time is positioned at subframe 3, as shown in Figure 9, Fig. 9 is the schematic diagram for D2D scheduling timing relation six in the embodiment of the present invention three.
Embodiment four:
D2D communication existence two kinds of patterns: pattern 1 and pattern 2.Wherein, pattern 1 time domain that to be base station indicate D2D transfer of data to use by D2Dgrant and frequency domain resource; Pattern 2 is the UE the sending D2D data time domain of selecting D2D transfer of data to use in resource allocation pond and frequency domain resource.
The present embodiment is supposed: SA comprises time-domain resource format transmission (T-RPT) instruction, and T-RPT is the subframe at the D2D data place being used to indicate scheduling.What the time index in T-RPT defined is the subframe possible transmitting D2D data.Time index in T-RPT can subframe in the resource pool of only pointing-type 2.If pattern 1 exists resource pool, the time index in T-RPT can subframe in the resource pool of pointing-type 1; If pattern 1 does not exist resource pool and there is the D2D data burst of pattern 1, the time index in T-RPT can the D2D data burst of pointing-type 1; If pattern 1 does not exist resource pool and there is not the D2D data burst of pattern 1, it is sub-frame of uplink that the time index in T-RPT can indicate.
For the D2D communication adopting pattern 2 or pattern 1 to dispatch, the original position defining method of the time index of the D2D transfer of data of T-RPT instruction has following several.
Method 1:
The time index original position of the D2D transfer of data of T-RPT instruction is the subframe of the resource pool of first pattern 2 after transmission first SA subframe, or the subframe of the resource pool of first pattern 1 (if pattern 1 exists resource pool), or the D2D subframe of first pattern 1 is (if there is D2D data burst in pattern 1, there is not resource pool in pattern 1), or first sub-frame of uplink (if pattern 1 does not exist D2D data burst and D2D resource pool).The time index original position defining method of such D2D transfer of data is simple, and the time index original position of D2D transfer of data and the number of transmissions of SA have nothing to do.Such as, high-level signaling configuration or agreement determine that the number of transmissions of SA is 3, that first time SA transmits in subframe 1 respectively, second time SA transmits in subframe 4, third time, SA transmitted in subframe 7, the resource pool subframe of the pattern 2 of first D2D transfer of data after first time SA transmission is subframe 3, subframe 3 is time index original positions of the D2D transfer of data of T-RPT instruction, as shown in Figure 10, the schematic diagram of the original position one of the time index of D2D transfer of data that provides for the embodiment of the present invention four of Figure 10.
Method 2:
The time index original position of D2D transfer of data of T-RPT instruction is the subframe of the resource pool of first pattern 2 after a transmission SA subframe last in the subframe of multiple transmission SA, or the subframe of the resource pool of first pattern 1 (if being configured with the resource pool of pattern 1), or the D2D data burst of first pattern 1 is (if there is D2D data burst in pattern 1, there is not resource pool in pattern 1), or first sub-frame of uplink (if pattern 1 does not exist D2D data burst and D2D resource pool).The efficiency of such T-RPT is higher, because can not have D2D transfer of data between multiple SA, D2D transfer of data can only start D2D transfer of data after the transmission of SA receives.Such as, high-level signaling configuration or agreement determine that the number of transmissions of SA is 3, that first time SA transmits in subframe 1 respectively, second time SA transmits in subframe 4, third time, SA transmitted in subframe 7, the resource pool subframe of the D2D transfer of data of first pattern 2 after last SA transmission is subframes 0, subframe 0 is the time index original position of the D2D transfer of data of T-RPT instruction, as shown in figure 11, the schematic diagram of the original position two of the time index of D2D transfer of data that provides for the embodiment of the present invention four of Figure 11.
Embodiment five:
For FDD community, if FDD cell configuration D2D subframe A, and D2D subframe A is not used in the HARQ-ACK information of the PDSCH of transmission descending sub frame A-4.The sub-frame of uplink A1 of 1st the non-D2D of HARQ-ACK information after D2D subframe A of the PDSCH of descending sub frame A-4 transmits, and meanwhile, the HARQ-ACK information of the PDSCH of descending sub frame A1-4 is transmitted at sub-frame of uplink A1, as shown in Figure 3.The number of sub frames transmitting the HARQ-ACK of PDSCH in sub-frame of uplink A1 is greater than 1.Obscure to prevent from not producing the individual number comprehension of the PDCCH of scheduling between base station and UE, dispatch at descending sub frame A1-4 in the DLDCI of the PDCCH of PDSCH and should comprise DLDAI territory, in above-mentioned DLDCI, power controls (TPC) territory and is interpreted as DLDAI territory, and this subframe does not have power command.In the ULDCI of the PDCCH of the PUSCH of descending sub frame A1-4 dispatching uplink subframe A1, TPC territory is interpreted as ULDAI territory, or in the ULDCI of the PDCCH of the PUSCH of descending sub frame A1-4 dispatching uplink subframe A1, TPC territory is still interpreted as TPC, does not have ULDAI territory.Like this, the bit number of the DCI format 0 of the peculiar search volume of UE and public search space scheduling PUSCH keeps the bit number of FDDDCI form 0 constant.
The composition structural representation of a kind of terminal that Figure 12 provides for the embodiment of the present invention, comprising: format determination module and blind check module, wherein,
Described format determination module, for the duplex mode according to community, determines the DCI format that this cell scheduling D2D communicates;
Described blind check module, for according to described DCI format, at the physical downlink control channel PDCCH of corresponding search volume blind check scheduling D2D communication and/or the Physical Downlink Control Channel EPDCCH of enhancing.
More than lift preferred embodiment; the object, technical solutions and advantages of the present invention are further described; be understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment done, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. an equipment dispatching method that equipment D2D is communicated, it is characterized in that, the method comprises:
User equipment (UE), according to the duplex mode of community, determines the Downlink Control Information DCI format that this cell scheduling D2D communicates;
UE, according to described DCI format, dispatches the physical downlink control channel PDCCH of D2D communication and/or the Physical Downlink Control Channel EPDCCH of enhancing in the blind check of corresponding search volume.
2. method according to claim 1, is characterized in that:
The bit number of the DCI format of described D2D communication is identical with the bit number of the DCI format 0 of TDD cell scheduling Physical Uplink Shared Channel PUSCH;
Described PDCCH and/or EPDCCH in corresponding search volume blind check scheduling D2D communication comprises:
If the duplex mode of community is TDD, UE PDCCH and/or EPDCCH that only blind check scheduling D2D communicates on the peculiar search volume of UE, or, PDCCH and/or EPDCCH that UE communicates with blind check scheduling D2D on public search space in the peculiar search volume of UE;
If the duplex mode of community is FDD, UE PDCCH and/or EPDCCH that only blind check scheduling D2D communicates on the peculiar search volume of UE.
3. method according to claim 2, is characterized in that, the method comprises further:
Power control is carried out with transmitting power control TPC territory in the upstream and downstream allocation index ULDAI or the upper line index ULindex territory that correspond to described DCI format 0 in the DCI format that UE communicates according to described D2D, and indicate NDI territory according to the differentiation territory of form in described DCI format 00 and form 1A, new data, demodulated reference signal cyclic shift CyclicshiftforDMRS territory, CQI request CQIrequest territory obtain resource format and transmit RPT and indicate;
Or, correspond to ULDAI or the ULindex territory of described DCI format 0 in the DCI format that UE communicates according to described D2D, the differentiation territory of form 0 and form 1A, NDI territory, CyclicshiftforDMRS territory, CQIrequest territory obtain resource format and transmit RPT and indicate.
4. method according to claim 1, is characterized in that:
If the duplex mode of community is TDD, the bit number of the DCI format of described D2D communication is identical with the bit number that TDD cell dispatches the DCI format 0 of PUSCH;
If the duplex mode of community is FDD, the bit number of the DCI format of described D2D communication is identical with the bit number of the DCI format 0 of FDD cell scheduling PUSCH.
5. method according to claim 4, is characterized in that, if the duplex mode of community is TDD, the method comprises further:
Power control is carried out with TPC territory in ULDAI or the ULindex territory corresponding to described DCI format 0 in the DCI format that UE communicates according to described D2D, and obtains resource format according to the differentiation territory of form in described DCI format 00 and form 1A, NDI territory, CyclicshiftforDMRS territory, CQIrequest territory and transmit RPT and indicate;
Or, correspond to ULDAI or the ULindex territory of described DCI format 0 in the DCI format that UE communicates according to described D2D, the differentiation territory of form 0 and form 1A, NDI territory, CyclicshiftforDMRS territory, CQIrequest territory obtain resource format and transmit RPT and indicate;
Or, in the DCI format that UE communicates according to described D2D
bit obtains the instruction of dispatching distribution SA resource, according to
bit obtains time domain or the instruction of frequency domain resource position of dispatching D2D data; Wherein, N is the bit number that SA resource pool comprises, and K is the Physical Resource Block logarithm that each SA comprises;
Or, correspond to ULDAI or the ULindex territory of described DCI format 0 in the DCI format that described D2D communicates by UE as reservation bit, and obtain resource format according to the differentiation territory of form in described DCI format 00 and form 1A, NDI territory, CyclicshiftforDMRS territory, CQIrequest territory and transmit RPT and indicate.
6. method according to claim 4, is characterized in that, if the duplex mode of community is FDD, the method comprises further:
UE obtains resource format according to the differentiation territory of form in described DCI format 00 and form 1A, NDI territory, CyclicshiftforDMRS territory, CQIrequest territory and transmits RPT and indicate;
Or, in the DCI format that UE communicates according to described D2D
bit obtains the instruction of SA resource, according to
bit obtains time domain or the instruction of frequency domain resource position of dispatching D2D data; Wherein, N is the bit number that SA resource pool comprises, and K is the Physical Resource Block logarithm that each SA comprises.
7. the method according to any one of claim 1 to 6, is characterized in that, PDCCH and/or EPDCCH of described blind check scheduling D2D communication comprises:
UE, at PDCCH and/or EPDCCH of all descending sub frame blind check scheduling D2D communication, obtains D2Dgrant;
Or PDCCH and/or EPDCCH that UE communicates at the descending sub frame blind check scheduling D2D that may dispatch PUSCH, obtains D2D and authorizes grant.
8. method according to claim 7, is characterized in that, the method comprises further:
UE after the subframe of D2Dgrant place and and the interval of described subframe first D2D subframe being more than or equal to L millisecond send first SA that described D2Dgrant dispatches in time;
Or, UE after the subframe of D2Dgrant place and and the interval of described subframe be more than or equal to D2D subframe that first of L millisecond be configured with SA resource pool and send first SA that described D2Dgrant dispatches in time;
Wherein, L nonnegative integral value.
9. the method according to any one of claim 1 to 6, is characterized in that, PDCCH and/or EPDCCH of described blind check scheduling D2D communication comprises:
If subframe n+k is D2D subframe, UE, at the D2Dgrant of descending sub frame n blind check scheduling D2D communication, if UE detects the D2Dgrant of scheduling D2D communication at descending sub frame n, then sends at subframe n+k first SA that described D2Dgrant dispatches in time;
Or, if subframe n+k is configured with SA resource pool, UE, at the D2Dgrant of descending sub frame n blind check scheduling D2D communication, if UE detects the D2Dgrant of scheduling D2D communication at descending sub frame n, then sends at subframe n+k first SA that described D2Dgrant dispatches in time.
10. method according to claim 9, is characterized in that:
If the duplex mode of community is FDD, then k=4;
If the duplex mode of community is TDD, and TDD is followed in described community those in subordinate positions will follow the example set by their superiors configuration 1-6, then the value of k is determined according to table 2:
Table 2
11. methods according to claim 9, is characterized in that, if the duplex mode of community is TDD, and TDD is followed in described community those in subordinate positions will follow the example set by their superiors configuration 0:
The many subframe scheduling instructions of D2D are obtained according to the ULindex territory in D2Dgrant;
Or, the value of k is determined according to table 5 or table 6:
Table 5
Table 6
Or, the value of k is determined according to table 2 and D2D sub-frame configuration:
Table 2
Describedly determine that the value of k comprises according to table 2 and D2D sub-frame configuration: if two sub-frame of uplink n+k that descending sub frame n may dispatch
1and n+k
2in only have a sub-frame of uplink n+k
mbe D2D subframe or only have a sub-frame of uplink to be configured with SA resource pool, m=1 or 2, then described first SA is at subframe n+k
msend; If described two sub-frame of uplink n+k
1and n+k
2be all D2D subframe or be all configured with SA resource pool, so, first SA is at subframe n+k
msend, k
mk
1, k
2in minimum value.
12. 1 kinds of methods of carrying out time-domain resource format transmission T-RPT and indicating, is characterized in that, comprising:
By the subframe in the SA resource pool of the time index instruction D2D communication pattern 2 in T-RPT;
If D2D communication pattern 1 exists SA resource pool, by the subframe in the SA resource pool of the time index instruction D2D communication pattern 1 in T-RPT;
If D2D communication pattern 1 does not exist SA resource pool and there is the D2D data burst of D2D communication pattern 1, with the D2D data burst of the time index instruction D2D communication pattern 1 in T-RPT;
If D2D communication pattern 1 does not exist SA resource pool and there is not the D2D data burst of D2D communication pattern 1, with the time index instruction sub-frame of uplink in T-RPT.
13. methods according to claim 12, is characterized in that:
The time index original position of D2D transfer of data indicated for D2D communication pattern 2, T-RPT is the subframe of the SA resource pool of first D2D communication pattern 2 after the subframe of transmission first SA;
The time index original position of D2D transfer of data indicated for the D2D communication pattern 1, T-RPT that there is SA resource pool is the subframe of the SA resource pool of first D2D communication pattern 1 after the subframe of transmission first SA;
For there is not SA resource pool and the time index original position of D2D transfer of data that the D2D communication pattern 1, T-RPT that there is D2D data burst indicates is the D2D subframe of first D2D communication pattern 1 after the subframe of transmission first SA;
For there is not SA resource pool and and the time index original position of D2D transfer of data that the D2D communication pattern 1, T-RPT that there is D2D data burst indicates is first sub-frame of uplink after the subframe of transmission first SA.
14. methods according to claim 12, is characterized in that:
Time index original position for the D2D transfer of data of D2D communication pattern 2, T-RPT instruction is the subframe that in the subframe of multiple transmission SA, last transmits the SA resource pool of first D2D communication pattern 2 after the subframe of SA;
The time index original position of D2D transfer of data indicated for the D2D communication pattern 1, T-RPT that there is SA resource pool is the subframe of the SA resource pool of first D2D communication pattern 1 after the subframe of last transmission SA in the subframe of multiple transmission SA;
For there is not SA resource pool and the time index original position of D2D transfer of data that the D2D communication pattern 1, T-RPT that there is D2D data burst indicates is the D2D subframe of first D2D communication pattern 1 after the subframe of last transmission SA in the subframe of multiple transmission SA;
For there is not SA resource pool and and the time index original position of D2D transfer of data that the D2D communication pattern 1, T-RPT that there is D2D data burst indicates is first sub-frame of uplink after the subframe of last transmission SA in the subframe of multiple transmission SA.
15. 1 kinds of equipment, is characterized in that, comprising: format determination module and blind check module, wherein:
Described format determination module, for the duplex mode according to community, determines the DCI format that this cell scheduling D2D communicates;
Described blind check module, for according to described DCI format, at the physical downlink control channel PDCCH of corresponding search volume blind check scheduling D2D communication and/or the Physical Downlink Control Channel EPDCCH of enhancing.
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