CN104683075B - Dispatching method and device in a kind of TDD D2D communication - Google Patents
Dispatching method and device in a kind of TDD D2D communication Download PDFInfo
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- CN104683075B CN104683075B CN201310632403.3A CN201310632403A CN104683075B CN 104683075 B CN104683075 B CN 104683075B CN 201310632403 A CN201310632403 A CN 201310632403A CN 104683075 B CN104683075 B CN 104683075B
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
Abstract
D2D UE in TDD D2D communication under heterogeneous networks coverage area has different available subframes.Therefore the part subframe for sending and retransmitting in multiple subframes needed for the same data packet may be unavailable for the UE in the network coverage, and for this problem, The present invention gives solutions.As one embodiment, it is respectively transmitted the method for different data packet by the way that downlink subframe and other subframes will be fixed, avoids the above problem to the full extent.The present invention is suitable for the scene that D2D UE is in heterogeneous networks coverage area.
Description
Technical field
The present invention relates to the schemes in time division duplex (TDD-Time Division Duplex) system, more particularly to base
In long term evolution (LTE-Long Term Evolution) device to the TDD of device (D2D-Device to Device) framework
Resource Allocation Formula.
Background technique
Traditional third generation cooperative partner program (3GPP -3rd Generation Partner Project) long term evolution
In (LTE-Long Term Evolution) system, time division duplex (TDD-Time Division Duplex) system is defined
Frame structure, as shown in table 1, wherein D indicate downlink subframe, U indicate sub-frame of uplink, S is special subframe:
Table 1:TDD LTE frame structure
In traditional 3GPP version, data transmission occurs between base station and user equipment (UE-User Equipment).
In 3GPP R12, device is set up the project and is discussed to device (D2D-Device to Device) communication, and the essence of D2D is special
Point is that the data between UE is allowed to transmit.For FDD and TDD system, 3GPP is in the first working group of wireless access network the 73rd
The conclusion that secondary meeting (RAN1#73) is reached is: the UE in D2D system does not allow to receive and dispatch simultaneously.Further, in order to avoid downlink
The interference that data communicate D2D, 3GPP specify that UE occupies the sub-frame of uplink of TDD for D2D communication.And for network coverage model
Outer UE is enclosed, a direct scheme is that UE is able to use all TDD subframes for D2D communication.
In D2D broadcast communication, in order to ensure receiving the quality of reception of UE, sends UE and need repeatedly to retransmit a data
Packet, typical retransmission scheme include incremental redundancy (IR-Increased Redundancy) and chase merging (CC-Chase
Combining).The complete transmission of i.e. one data packet may occupy multiple subframes.
One typical scene of D2D communication be participate in D2D communication part UE be in that the network coverage is interior i.e. can only be in uplink
Subframe receives D2D data；And another part UE is in outside the network coverage, can receive D2D data in all subframes.How to divide
Solution is needed with one occupied subframe of data packet of complete transmission.Further, the solution should be as far as possible
Other compatible scenes such as participate in all UE of D2D communication all in the network coverage, or participate in all UE of D2D communication
Outside all in the network coverage.
Summary of the invention
The invention discloses a kind of methods in UE, wherein includes the following steps:
A. D2D data are sent in the first subframe, the first subframe belongs to TDD frequency range in frequency domain
B. the K subframe after the first subframe retransmits the D2D data, and the K is positive integer
Wherein, if index belongs to set S in the frame of the first subframe, index is belonged to described in the frame of the K subframe
Set S；If index is not belonging to the set S in the frame of the first subframe, index is all not belonging to described in the frame of the K subframe
Set S；The set S is { 0,1,5,6 }.
Index refers to index of the subframe in the frame belonging to it in the frame, and index is 0 to 9 integer in the frame.Institute
UE is stated to be in outside the network coverage or in the network coverage.The set S is the fixation downlink subframe in tdd frame structure, above-mentioned step
Rapid essence is that the multiple subframes (including send and retransmit for the first time) for sending the same data packet are limited in fixed downlink of TDD
In frame (UE in the network coverage cannot receive D2D signal) or be that (UE in the network coverage has in the fixed downlink subframe of non-TDD
D2D signal may be received).Avoid the occurrence of part in the multiple subframes (including send and retransmit for the first time) for send the same data packet
It is the fixed downlink subframe of TDD, is partially TDD on-fixed downlink subframe.As one embodiment, if current (detecting)
Except D2D receives UE all in the network coverage, then D2D sends the fixed downlink subframe of UE selection TDD and sends and retransmit same number
According to packet.As one embodiment, the K is 3；As another embodiment, the K is 5；As another embodiment, the K
It is 7.
Specifically, according to an aspect of the present invention, which is characterized in that further include following steps before the step A:
A0. base station signal or external signal are received or D2D signal obtains frame synchronization.
The D2D signal is the signal sent by UE, and the external signal refers to the signal other than Cellular Networks, as one
Embodiment, the external signal are GPS signals.
Specifically, according to an aspect of the present invention, which is characterized in that if index is not belonging to institute in the frame of the first subframe
Set S is stated, the K subframe is on the continuous K frame after following the first subframe place frame closely with the son indexed in same number of frames
Frame.
The essence of above-mentioned aspect is that the multiple subframes for sending the same data packet are limited in a kind of TDD UL/DL frame structure
In sub-frame of uplink in so that D2D UE is possible to receive the serving cell of UE according to the D2D in the network coverage that detects
TDD UL/DL frame structure selects suitable subframe to send data packet.As one embodiment, if current (detecting) D2D
It receives UE to be mostly in except the network coverage, small part is in the network coverage and the TDD UL/DL frame structure of serving cell
For frame structure #2, then D2D sends UE selection in subframe 2(or subframe 7) data packet is sent, and in subsequent continuous K frame
Same subframe retransmits the data packet.
Specifically, according to an aspect of the present invention, which is characterized in that if described in index belongs in the frame of the first subframe
Set S, the K subframe is following one:
The subframe with index in same number of frames on continuous K frame after frame where following the first subframe closely
The subframe with index in identical field on continuous K field after field where following the first subframe closely
Follow the subframe that index in the continuous K frame after the first subframe belongs to the set S closely.
The field refers to the either rear field of the preceding field of the frame, that is, includes the subframe { 0,1,2,3,4 } in a frame
An or subframe { 5,6,7,8,9 } in frame.Index refers to index of the subframe in the field belonging to it in the field, described
Index is 0 to 4 integer in field.
Specifically, according to an aspect of the present invention, which is characterized in that further include following steps:
A1. D2D signal designation frame synchronization is sent.
The invention discloses a kind of methods in UE, wherein includes the following steps:
A. D2D data are received in the first subframe, the first subframe belongs to TDD frequency range in frequency domain
B. the K subframe after the first subframe receives the re-transmission signal of the D2D data, and the K is positive integer
Wherein, if index belongs to set S in the frame of the first subframe, index is belonged to described in the frame of the K subframe
Set S；If index is not belonging to the set S in the frame of the first subframe, index is all not belonging to described in the frame of the K subframe
Set S；The set S is { 0,1,5,6 }.
As one embodiment, the UE is in outside the network coverage.
Specifically, according to an aspect of the present invention, which is characterized in that further include following steps before the step A:
A0. it receives external signal or D2D signal obtains frame synchronization.
Specifically, according to an aspect of the present invention, which is characterized in that if index is not belonging to institute in the frame of the first subframe
Set S is stated, the K subframe is on the continuous K frame after following the first subframe place frame closely with the son indexed in same number of frames
Frame.
Specifically, according to an aspect of the present invention, which is characterized in that if described in index belongs in the frame of the first subframe
Set S, the K subframe is following one:
The subframe with index in same number of frames on continuous K frame after frame where following the first subframe closely
The subframe with index in identical field on continuous K field after field where following the first subframe closely
Follow the subframe that index in the continuous K frame after the first subframe belongs to the set S closely.
The invention discloses a kind of user equipmenies, which is characterized in that the equipment includes:
First module: frame synchronization is obtained for receiving base station signal or external signal or D2D signal
Second module: for sending D2D signal designation frame synchronization
Third module: for sending D2D data in the first subframe, the first subframe belongs to TDD frequency range in frequency domain
4th module: the D2D data are retransmitted for the K subframe after the first subframe, the K is positive integer
Wherein, if index belongs to set S in the frame of the first subframe, index is belonged to described in the frame of the K subframe
Set S；If index is not belonging to the set S in the frame of the first subframe, index is all not belonging to described in the frame of the K subframe
Set S；The set S is { 0,1,5,6 }.
The invention discloses a kind of user equipmenies, which is characterized in that the equipment includes:
First module: frame synchronization is obtained for receiving external signal or D2D signal
Second module: for receiving D2D data in the first subframe, the first subframe belongs to TDD frequency range in frequency domain
Third module: receiving the re-transmission signal of the D2D data for the K subframe after the first subframe, and the K is
Positive integer
Wherein, if index belongs to set S in the frame of the first subframe, index is belonged to described in the frame of the K subframe
Set S；If index is not belonging to the set S in the frame of the first subframe, index is all not belonging to described in the frame of the K subframe
Set S；The set S is { 0,1,5,6 }.
D2D UE in TDD D2D communication under heterogeneous networks coverage area has different available subframes.Therefore it sends out
Sending and retransmit part subframe in multiple subframes needed for the same data packet may can not for the UE in the network coverage
With for this problem, The present invention gives solutions.Difference is respectively transmitted by the way that downlink subframe and other subframes will be fixed
The method of data packet, avoids the above problem to the full extent.The present invention is suitable for D2D UE and is in heterogeneous networks coverage area
Scene.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, of the invention other
Feature, objects and advantages will become more apparent:
Fig. 1 shows the schematic diagram of the fixed downlink subframe of TDD of D2D communication according to an embodiment of the invention；
Fig. 2 shows the signals according to an embodiment of the invention that D2D data are sent in the fixed downlink subframe of non-TDD
Figure；
Fig. 3 shows the schematic diagram that D2D data according to an embodiment of the invention send subframe selection；
Fig. 4 shows the flow diagram according to an embodiment of the invention for obtaining frame synchronization；
Fig. 5 shows the D2D data sending device structural block diagram in user equipment according to an embodiment of the invention；
Fig. 6 shows the D2D data sink structural block diagram in user equipment according to an embodiment of the invention；
Specific embodiment
Technical solution of the present invention is described in further detail below in conjunction with attached drawing, it should be noted that do not rushing
In the case where prominent, the feature in embodiments herein and embodiment can be arbitrarily combined with each other.
Embodiment 1
Embodiment 1 illustrates the fixed downlink subframe of TDD of D2D communication, as shown in Fig. 1.
UE is sent for D2D data, D2D data are sent first in the first subframe, the first subframe belongs to TDD in frequency domain
Frequency range, then the K subframe after the first subframe retransmits the D2D data, and the K is positive integer.Wherein, if the first son
Index belongs to the subframe of 1 bend of set S(attached drawing mark in the frame of frame), the interior index of the frame of the K subframe belongs to described
Set S；If the blank subframe that index is not belonging in the set S(attached drawing 1 in the frame of the first subframe).
For D2D data receiver UE, D2D data are received first in the first subframe, the first subframe belongs to TDD in frequency domain
Frequency range, then the K subframe after the first subframe receives the D2D data retransmitted, and the K is positive integer.Wherein, if
Index belongs to the subframe of 1 bend of set S(attached drawing mark in the frame of first subframe), the interior index of the frame of the K subframe all belongs to
In the set S；If the blank subframe that index is not belonging in the set S(attached drawing 1 in the frame of the first subframe).
Embodiment 2
Embodiment 2, which is illustrated, sends the schematic diagram of D2D data in the fixed downlink subframe of non-TDD, as shown in Fig. 2.
UE is sent for D2D data, D2D data are sent first in the first subframe, the first subframe belongs to TDD in frequency domain
Frequency range, the first subframe are the subframes 2 of the 0th frame；Then the D2D data are retransmitted in the subframe 2 of the 1st frame to k-th frame.
For D2D data receiver UE, D2D data are received first in the first subframe, the first subframe belongs to TDD in frequency domain
Frequency range, the first subframe are the subframes 2 of the 0th frame；Then the D2D data retransmitted are received in the subframe 2 of the 1st frame to k-th frame.Institute
It states D2D data receiver UE to be in the network coverage, the TDD UL/DL frame structure of serving cell is configured to #2.
Embodiment 3
Embodiment 3 illustrates the schematic diagram that D2D data send subframe selection, as shown in Fig. 3.In attached drawing 3, UE N1 is
D2D data send UE, and UE N1 is in outside the network coverage；UE U2 and UE U3 are at D2D data receiver UE, UE U2 and UE U3
In outside the network coverage.
For UE N1: external signal is received in step s 11 or D2D signal obtains frame synchronization；In step s 12,
D2D data are sent in one subframe, the first subframe belongs to TDD frequency range in frequency domain；In step s 13,5 after the first subframe
A subframe retransmits the D2D data.
For UE U2: external signal is received in the step s 21 or D2D signal obtains frame synchronization；In step S22,
D2D data are received in one subframe, the first subframe belongs to TDD frequency range in frequency domain；In step S23, after the first subframe 5
A subframe receives the D2D data retransmitted.
For UE U3: external signal is received in step S31 or D2D signal obtains frame synchronization；In step s 32,
D2D data are received in one subframe, the first subframe belongs to TDD frequency range in frequency domain；In step S33, after the first subframe 5
A subframe receives the D2D data retransmitted.
In embodiment 3, if frame where the first subframe is the 0th frame, index x is in { 0,1,5,6 } in the frame of the first subframe
One, 5 subframes are following one:
Subframe x on-the 1 frame to the 5th frame
The 5th subframe after-the first subframe, the 10th subframe, the 15th subframe, the 20th subframe, the 25th subframe.
If x is 0,5 subframes are the subframes 1 of the 0th frame, the subframe 5 of the 0th frame, the subframe 6 of the 0th frame, the 1st frame
The subframe 1 of the 0, the 1st frame of subframe；If x is 1,5 subframes are the subframe 5 of the 0th frame, the subframe 6 of the 0th frame, the son of the 1st frame
The subframe 1 of the 0, the 1st frame of frame, the subframe 5 of the 1st frame；If x is 5,5 subframes are the subframe 6 of the 0th frame, the subframe of the 1st frame
The subframe 1 of 0, the 1st frame, the subframe 5 of the 1st frame, the subframe 6 of the 1st frame；If x is 6,5 subframes are the subframes 0 of the 1st frame,
The subframe 1 of 1st frame, the subframe 5 of the 1st frame, the subframe 6 of the 1st frame, the subframe 0 of the 2nd frame.
Embodiment 4
Embodiment 4 illustrates the flow diagram for obtaining frame synchronization, as shown in Fig. 4.In attached drawing 4, UE N4 is D2D letter
Number UE is sent, UE N4 is in the network coverage；UE U5 and UE U6 are that D2D signal receives UE, and UE U5 and UE U6 are in network
Covering is outer.
For UE N4: in step S41, receives base station signal and obtain frame synchronization；D2D signal is sent in step S42 to refer to
Show frame synchronization.
For UE U5: in step s 51, receives the D2D signal and obtain frame synchronization.
For UE U6: in step S61, receives the D2D signal and obtain frame synchronization.
Embodiment 5
Embodiment 5 illustrates the D2D data sending device structural block diagram in user equipment, as shown in Fig. 5.In attached drawing 5,
D2D data sending device 400 is by the first receiving module 401, and the second sending module 402, third sending module 403, the 4th sends
Module 404 is constituted.
First receiving module 401 obtains frame synchronization for receiving base station signal or external signal or D2D signal
Second sending module 402 is for sending D2D signal designation frame synchronization
Third sending module 403 is used to send D2D data in the first subframe, and the first subframe belongs to TDD frequency in frequency domain
Section
4th sending module 404 retransmits the D2D data for the K subframe after the first subframe, and the K is just whole
Number
Wherein, if index belongs to set S in the frame of the first subframe, index is belonged to described in the frame of the K subframe
Set S；If index is not belonging to the set S in the frame of the first subframe, index is all not belonging to described in the frame of the K subframe
Set S；The set S is { 0,1,5,6 }.
Embodiment 6
Embodiment 6 illustrates the D2D data sink structural block diagram in user equipment, as shown in Fig. 6.In attached drawing 6,
D2D data sending device 500 is made of the first receiving module 501, the second receiving module 502, third receiving module 503.
First receiving module 501 obtains frame synchronization for receiving external signal or D2D signal
Second receiving module 502 is used to receive D2D data in the first subframe, and the first subframe belongs to TDD frequency in frequency domain
Section
Third receiving module 503 receives the re-transmission signal of the D2D data for the K subframe after the first subframe,
The K is positive integer
Wherein, if index belongs to set S in the frame of the first subframe, index is belonged to described in the frame of the K subframe
Set S；If index is not belonging to the set S in the frame of the first subframe, index is all not belonging to described in the frame of the K subframe
Set S；The set S is { 0,1,5,6 }.
Those of ordinary skill in the art will appreciate that all or part of the steps in the above method can be referred to by program
Related hardware is enabled to complete, described program can store in computer readable storage medium, such as read-only memory, hard disk or light
Disk etc..Optionally, one or more integrated circuit can be used also to realize in all or part of the steps of above-described embodiment.Phase
It answers, each modular unit in above-described embodiment, can be realized using example, in hardware, it can also be by the form of software function module
It realizes, the application is not limited to the combination of the software and hardware of any particular form.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification made, equivalent replacement, improve etc., it should be included in protection of the invention
Within the scope of.
Claims (11)
1. a kind of method in UE, wherein include the following steps:
A. D2D data are sent in the first subframe, the first subframe belongs to TDD frequency range in frequency domain；
B. the K subframe after the first subframe retransmits the D2D data, and the K is positive integer；
Wherein, if index belongs to set S in the frame of the first subframe, index belongs to the set in the frame of the K subframe
S；If index is not belonging to the set S in the frame of the first subframe, index is all not belonging to the set in the frame of the K subframe
S；The set S is { 0,1,5,6 }.
2. the method according to claim 1, wherein further including following steps before the step A:
A0. base station signal or external signal are received or D2D signal obtains frame synchronization.
3. the method according to claim 1, wherein if index is not belonging to the set in the frame of the first subframe
S, the K subframe are on the continuous K frame after following the first subframe place frame closely with the subframe indexed in same number of frames.
4. method described in any claim according to claim 1 or in 3, which is characterized in that if in the frame of the first subframe
Index belongs to the set S, and the K subframe is following one:
The subframe with index in same number of frames on continuous K frame after frame where following the first subframe closely；
The subframe with index in identical field on continuous K field after field where following the first subframe closely；
Follow the subframe that index in the continuous K frame after the first subframe belongs to the set S closely.
5. the method according to claim 1, wherein further including following steps:
A1. D2D signal designation frame synchronization is sent.
6. a kind of method in UE, wherein include the following steps:
A. D2D data are received in the first subframe, the first subframe belongs to TDD frequency range in frequency domain；
B. the K subframe after the first subframe receives the re-transmission signal of the D2D data, and the K is positive integer；
Wherein, if index belongs to set S in the frame of the first subframe, index belongs to the set in the frame of the K subframe
S；If index is not belonging to the set S in the frame of the first subframe, index is all not belonging to the set in the frame of the K subframe
S；The set S is { 0,1,5,6 }.
7. according to the method described in claim 6, it is characterized in that, further including following steps before the step A:
A0. it receives external signal or D2D signal obtains frame synchronization.
8. according to the method described in claim 6, it is characterized in that, if index is not belonging to the set in the frame of the first subframe
S, the K subframe are on the continuous K frame after following the first subframe place frame closely with the subframe indexed in same number of frames.
9. the method according to any claim in claim 6 or 8, which is characterized in that if in the frame of the first subframe
Index belongs to the set S, and the K subframe is following one:
The subframe with index in same number of frames on continuous K frame after frame where following the first subframe closely；
The subframe with index in identical field on continuous K field after field where following the first subframe closely；
Follow the subframe that index in the continuous K frame after the first subframe belongs to the set S closely.
10. a kind of user equipment, which is characterized in that the equipment includes:
First module: frame synchronization is obtained for receiving base station signal or external signal or D2D signal；
Second module: for sending D2D signal designation frame synchronization；
Third module: for sending D2D data in the first subframe, the first subframe belongs to TDD frequency range in frequency domain；
4th module: the D2D data are retransmitted for the K subframe after the first subframe, the K is positive integer；
Wherein, if index belongs to set S in the frame of the first subframe, index belongs to the set in the frame of the K subframe
S；If index is not belonging to the set S in the frame of the first subframe, index is all not belonging to the set in the frame of the K subframe
S；The set S is { 0,1,5,6 }.
11. a kind of user equipment, which is characterized in that the equipment includes:
First module: frame synchronization is obtained for receiving external signal or D2D signal；
Second module: for receiving D2D data in the first subframe, the first subframe belongs to TDD frequency range in frequency domain；
Third module: receiving the re-transmission signal of the D2D data for the K subframe after the first subframe, and the K is just whole
Number；
Wherein, if index belongs to set S in the frame of the first subframe, index belongs to the set in the frame of the K subframe
S；If index is not belonging to the set S in the frame of the first subframe, index is all not belonging to the set in the frame of the K subframe
S；The set S is { 0,1,5,6 }.
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| EP2498419A2 (en) * | 2011-03-10 | 2012-09-12 | Samsung Electronics Co., Ltd. | Flexible time division duplex method and apparatus for communication system |
| CN103368713A (en) * | 2012-03-26 | 2013-10-23 | 中兴通讯股份有限公司 | Device-to-device communication method and device |
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