CN104104485B - A kind of D2D data transmission method - Google Patents
A kind of D2D data transmission method Download PDFInfo
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- CN104104485B CN104104485B CN201310124336.4A CN201310124336A CN104104485B CN 104104485 B CN104104485 B CN 104104485B CN 201310124336 A CN201310124336 A CN 201310124336A CN 104104485 B CN104104485 B CN 104104485B
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Abstract
This application discloses a kind of D2D data transmission method, this method realizes that D2D is transmitted using ascending resource, and the subframe and re-transmission period used in D2D transmitting procedures D2D data transfers is controlled, avoid using the subframe sent shared by D2D transmission control information to base station to carry out data transmission, simultaneously, limit and retransmit that the HARQ processes used are identical with the HARQ processes just passed, clashed during avoiding transmitting D2D data again between UE with the re-transmission of cellular system.The present invention can reduce the influence to cellular system, it is adaptable in the cellular communication system for introducing D2D technologies while D2D transmission is effectively realized.
Description
Technical field
The present invention relates to mobile communication technology, more particularly to a kind of data transfer of D2D (Device to Device)
Method.
Background technology
In existing LTE system, two user equipmenies（UE）Between data transfer all by being transferred in network side
Realize, transmitting terminal UE first has to communication data being sent to network side, and network side is again by the data forwarding to receiving terminal afterwards
UE。
In actual applications, there is transmitting terminal UE and application scenarios closer to the distance receiving terminal UE, in this case, two UE it
Between can directly be communicated, and use the data transfer mode in existing LTE system, then the communication data between two UE is still
Need just issue other side by the transmission of network side, it is clear that this believes the reduction and control of causing efficient network resource usage
The increase of order.
The problem of for above-mentioned scene, be currently suggested D2D technologies, an important idea of the technology be exactly two UE it
Between can directly transmit communication data, and no longer need network side to carry out transfer.The negative of network side can be reduced by introducing D2D technologies
Carry, reduce the propagation delay time of data, additionally due to two UE are closer to the distance, can effectively reduce UE transmission power, reduction pair
The interference of other users, while realizing the purpose of energy-conservation.In order to be different from this D2D transmission technologys, hereinafter referred to as original transmission
Mode is cellular transmission.
In order to ensure that network is controllable, the central controlled D2D transmission technologys of network side can be used.In this technology, net
Network side is had the ability the whole D2D transmitting procedures of control, i.e., by network side by control signaling control the foundation of D2D transmission, maintenance and
Release process, and business datum is directly transmitted between two UE.By the central controlled D2D transmission of network side such as Fig. 1 institutes
Show.
Because system is introduced after D2D technologies, the transmission control of control signaling is only responsible in base station, and business datum is directly in UE
Between transmit, and existing cellular transmission method is applied to the directly two network element inter-entity that are communicated（As between base station and UE）Both entered
The transmitting-receiving of row data carries out the situation of the transmitting-receiving of corresponding control signaling simultaneously, therefore, honeycomb can not be directly continued to use in D2D technologies
Transmission method.
Not yet propose a kind of data transmission method for the cellular communication system for being suitable for introduce into D2D technologies at present.
The content of the invention
In view of this, it is a primary object of the present invention to provide a kind of D2D data transmission method, this method is applied to draw
In the cellular communication system for having entered D2D technologies.
In order to achieve the above object, technical scheme proposed by the present invention is：
A kind of D2D data transmission method, including：
Default D2D re-transmission periods T is notified the user equipment (UE) to access network by a, base station in advance, wherein, work as system
When Loop Round Trip Time RTT is 10ms, the T is equal to n and Z product；When system Loop Round Trip Time RTT is not 10ms, the T is more than
N and Z product, n is the natural number more than or equal to 2, and Z is the duration of a radio frames；
B, when needing to carry out D2D data transfers between two user equipmenies, transmitting terminal UE1 is from currently available sub-frame of uplink
In select a subframe t1 and be used to just pass the D2D data, and according to the re-transmission period T and the subframe t1, it is determined that again
It is secondary to transmit sub-frame of uplink t4 used in data to receiving terminal UE2, wherein, according to the HARQ sequential of systemic presupposition, the subframe
The corresponding ascending HARQ courses of t1 ascending HARQ course corresponding with the subframe t4 is identical；
C, the UE1 utilize the corresponding ascending HARQ courses of the subframe t1, send out the D2D data in the subframe t1
Give receiving terminal UE2；
D, the UE2 are received after the D2D data, and corresponding control information is reported into base station in sub-frame of uplink t2,
The sub-frame of uplink t2 is at least d milliseconds after the subframe t1 of sub-frame of uplink；The d is default processing delay system
Number；
E, the base station are handled according to the control information received, and tie the processing in descending sub frame t3
Really corresponding authorization message is sent to the UE1 and UE2；
F, when the UE1 according to the authorization message received judge need to UE2 transmit data when, the UE1
In the subframe t4, corresponding data are sent to the UE2 using the corresponding ascending HARQ courses of the subframe t4.
In summary, D2D proposed by the present invention data transmission method, realizes that D2D is transmitted using ascending resource, and
The subframe and re-transmission period used in D2D transmitting procedures D2D data transfers is controlled, it is to avoid sent using to base station
Subframe shared by D2D transmission control information carries out data transmission, meanwhile, limit what is retransmitted the HARQ processes used and just pass
HARQ processes are identical, clashed during avoiding transmitting D2D data again between UE with the re-transmission of cellular system.In this way, both may be used
Effectively realize that D2D is transmitted, the influence to cellular system can be reduced again.Therefore the present invention has been suitable for introduce into the honeycomb of D2D technologies
In communication system.
Brief description of the drawings
Fig. 1 is the central controlled D2D transmission schematic diagram of network side；
Fig. 2 is that D2D transmits the network diagram occurred parallel with cellular transmission;
Fig. 3 is the schematic flow sheet of the embodiment of the present invention one.
Embodiment
It is right below in conjunction with the accompanying drawings and the specific embodiments to make the object, technical solutions and advantages of the present invention clearer
The present invention is described in further detail.
The present invention will carry out D2D transmission using ascending resource.Simultaneously, it is contemplated that D2D transmission needs network side to control to pass
Defeated foundation, maintenance and release process, that is to say, that in D2D transmission, UE needs to be communicated with base station, and so, just having can
The situation that UE needs communicate in same subframe with two network elements can occurs, for example, UE needs both to have received transmission in same subframe
The D2D data for holding UE to send, simultaneously, it is also desirable to the control information of D2D data transfers is sent to base station（Such as ACK/NACK UCI
Information）.And according to existing system, the transmitting-receiving that UE carries out data in same subframe with different network elements can not be realized.Cause
This needs the appearance for considering to be avoided above-mentioned situation when carrying out D2D data transfers.
In addition, when specifically carrying out transmitting uplink data, hybrid automatic request will be set to retransmit in system（HARQ）Sequential,
Corresponding process is set according to the sequential, so, can determine that each process is passed in different radio frames according to HARQ sequential
Used subframe when defeated, and according to existing cellular system, used process needs and first before during uplink data retransmission
The process used during biography is identical.So, consideration is needed to avoid D2D data from retransmitting and cell retransmissions when carrying out D2D data transfers
Use identical subframe.
Based on above-mentioned consideration, core concept of the invention is：When carrying out D2D transmission using ascending resource, to D2D data
The subframe and re-transmission period of transmission are controlled, it is to avoid transmit control information institute using the D2D such as ACK/NACK are sent to base station
The subframe of occupancy, meanwhile, limit that to retransmit the process used with the process just passed identical, to avoid in re-transmission and cellular system
Re-transmission is clashed.
Fig. 3 is the schematic flow sheet of the embodiment of the present invention one, as shown in figure 3, the D2D transmission side datas that the embodiment is realized
Method mainly includes：
Step 301, base station in advance notify default D2D re-transmission periods T the user equipment (UE) to access network.
Here, clashed in order to avoid D2D data are retransmitted with cellular communication, it is necessary to be carried out to D2D re-transmission periods T special
Set, specifically, when system Loop Round Trip Time RTT is 10ms, the T needs to be set to n and Z product；Wherein, n be more than
Natural number equal to 2, Z is the duration of a radio frames；When system Loop Round Trip Time RTT is not 10ms, the T then needs to be more than
The n and Z product.
Step 302, when needing to carry out D2D data transfers between two user equipmenies, transmitting terminal UE1 is from currently available
A subframe t1 is selected in row subframe to be used to just pass the D2D data, and according to the re-transmission period T and the subframe t1,
It is determined that transmitting sub-frame of uplink t4 used in data to receiving terminal UE2 again.
, it is necessary to from currently available sub-frame of uplink in this step（The sub-frame of uplink for cellular communication that i.e. it goes without doing）In select
One is used to just pass D2D data, so, it can be ensured that the subframe sent to base station shared by data will not be used to carry out data biography
Defeated, i.e. UE is transmitted in D2D will not be while carry out the communication with base station in the subframe used so that D2D transmission will not be logical with honeycomb
Letter is clashed, it is to avoid influence cellular communication.
Also, this step is it is determined that, it is necessary to according to the HARQ sequential of systemic presupposition, make the subframe t4 correspondences during subframe t4
Ascending HARQ course ascending HARQ course corresponding with the subframe t1 it is identical.So, D2D data are transmitted again by limiting
Shi Caiyong is with just passing identical process, using the process retransmitted for cellular system when can avoid carrying out D2D transmission again, i.e.,
Avoid D2D transmission from retransmitting with cellular system to clash.
Specifically, the HARQ sequential of systemic presupposition can will not be repeated here compared with LTE system.
Step 303, the UE1 utilize the corresponding ascending HARQ courses of the subframe t1, in the subframe t1 by the D2D
Data are sent to receiving terminal UE2.
Here, the specific method for sending data using ascending HARQ course will not be repeated here compared with system.
Step 304, the UE2 are received after the D2D data, are reported corresponding control information in sub-frame of uplink t2
Base station, the sub-frame of uplink t2 is at least d milliseconds after the subframe t1 of sub-frame of uplink.
Here, it is contemplated that the processing delay of UE sides is, it is necessary to which sub-frame of uplink t2 is set to be located at after the subframe t1 extremely
Few d milliseconds sub-frame of uplink.The d is default processing delay coefficient, in actual applications, it is necessary to be received according to UE after data
Data processing time delay its specific value is set, to cause UE2 to have enough data processing times before hair control information.
Preferably, the d values could be arranged to 4ms.
Specifically, the control information can include ACK/NACK information.
Further, can also according to the ascending HARQ sequential, make the corresponding ascending HARQ courses of the subframe t2 with
The corresponding ascending HARQ course of the subframe t1 is identical, so, by the control information and D2D data that ensure to feed back D2D transmission
Transmission uses identical process, and D2D transmission can be caused independently of cellular transmission, will not to be reduced with cellular communication multiplexed sub frame
Influence to cellular system.
Step 305, the base station are handled according to the control information received, and will be described in descending sub frame t3
The corresponding authorization message of result is sent to the UE1 and UE2.
Here, the specific determination method of the subframe t3 compared with LTE system, that is, can meet LTE system mandate determine
Shi Yaoqiu, will not be repeated here.
Explanation is needed exist for, when needing to carry out D2D data transfers, base station needs to be progress D2D data transfers
Subframe and the ascending resource information of distribution notify to data sending terminal and receiving terminal（Authorized）, in actual applications,
Base station needs to tell authorization message to transmitting terminal and receiving terminal i.e. UE1 and UE2 in subframe t3.
In this step, the specific method of authorization message is handled control information and sent, is those skilled in the art institute
Grasp will not be repeated here.
Step 306, when the UE1 according to the authorization message received judge need to UE2 transmit data when, institute
UE1 is stated in the subframe t4, corresponding data are sent to the UE2 using the corresponding ascending HARQ courses of the subframe t4.
Here, UE1 needs the data transmitted to UE2 both can be to retransmit data or new biography data.
In this step, as it was previously stated, the corresponding ascending HARQ courses of subframe t4 ascending HARQ course corresponding with subframe t1
It is identical, thereby it can be assured that the D2D data transfers between UE1 and UE2 will not use the re-transmission subframe of cellular communication, that is, ensure
The D2D data transfers directly carried out between UE1 and UE2 will not conflict with cellular communication.
In summary, presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in the present invention's
Within protection domain.
Claims (5)
1. a kind of D2D data transmission method, it is characterised in that including：
Default D2D re-transmission periods T is notified the user equipment (UE) to access network by a, base station in advance, wherein, when system loopback
When time RTT is 10ms, the T is equal to n and Z product；When system Loop Round Trip Time RTT is not 10ms, the T is more than n and Z
Product, n is natural number more than or equal to 2, and Z is the duration of a radio frames；
B, when needed between two user equipmenies carry out D2D data transfers when, transmitting terminal UE1 is selected from currently available sub-frame of uplink
Selecting out a subframe t1 is used to just pass the D2D data, and according to the re-transmission period T and the subframe t1, it is determined that again to
Sub-frame of uplink t4 used in receiving terminal UE2 transmission data, wherein, according to the HARQ sequential of systemic presupposition, t1 pairs of the subframe
The ascending HARQ course answered ascending HARQ course corresponding with the subframe t4 is identical；
C, the UE1 utilize the corresponding ascending HARQ courses of the subframe t1, are sent to the D2D data in the subframe t1
Receiving terminal UE2；
D, the UE2 are received after the D2D data, and corresponding control information is reported into base station in sub-frame of uplink t2, described
Sub-frame of uplink t2 is at least d milliseconds after the subframe t1 of sub-frame of uplink；The d is default processing delay coefficient；
E, the base station are handled according to the control information received, and in descending sub frame t3 that result is corresponding
Authorization message is sent to the UE1 and UE2；
F, when the UE1 according to the authorization message received judge need to UE2 transmit data when, the UE1 is in institute
Subframe t4 is stated, corresponding data are sent to the UE2 using the corresponding ascending HARQ courses of the subframe t4.
2. according to the method described in claim 1, it is characterised in that the mandate that subframe t3 described in step e meets LTE system is determined
Shi Yaoqiu.
On 3. according to the method described in claim 1, it is characterised in that according to the HARQ sequential, the subframe t2 is corresponding
Row HARQ processes ascending HARQ course corresponding with the subframe t1 is identical.
4. according to the method described in claim 1, the control information includes ACK/NACK information.
5. according to the method described in claim 1, it is characterised in that the d is 4ms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310124336.4A CN104104485B (en) | 2013-04-11 | 2013-04-11 | A kind of D2D data transmission method |
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| CN201310124336.4A CN104104485B (en) | 2013-04-11 | 2013-04-11 | A kind of D2D data transmission method |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105657835B (en) * | 2014-11-14 | 2020-03-24 | 联想(北京)有限公司 | Information processing method, electronic equipment and base station |
| CN105991247A (en) * | 2015-02-16 | 2016-10-05 | 中兴通讯股份有限公司 | Device-to-device sending method, receiving method, scheduling method and corresponding devices |
| WO2016182601A1 (en) * | 2015-05-14 | 2016-11-17 | Intel Corporation | Reduction of concurrent signaling in a relay user equipment (ue) |
| ES2759750T3 (en) | 2015-06-30 | 2020-05-12 | Huawei Tech Co Ltd | Method and apparatus for uplink data transmission |
| US9955460B2 (en) * | 2015-07-01 | 2018-04-24 | Qualcomm Incorporated | Scheduling assignment optimization for device-to-device communications |
| WO2017113901A1 (en) * | 2015-12-28 | 2017-07-06 | 中兴通讯股份有限公司 | Information transmission method and device |
| CN111817826B (en) * | 2019-07-24 | 2022-02-01 | 维沃移动通信有限公司 | Side link information transmission method, terminal and control node |
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| CN103002578A (en) * | 2011-09-08 | 2013-03-27 | 中国移动通信集团公司 | Method, device and system for realizing D2D (device to device) data transmission in cellular network |
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Patent Citations (4)
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| CN102282901A (en) * | 2009-01-16 | 2011-12-14 | 诺基亚公司 | Enabling device-to-device communication in cellular networks |
| CN102714861A (en) * | 2010-01-19 | 2012-10-03 | 诺基亚公司 | Evolved node B controlled centralized resource reuse for device-to-device and cellular users |
| WO2012019348A1 (en) * | 2010-08-12 | 2012-02-16 | Nokia Corporation | Configuring an uplink and downlink splitting pattern for device-to-device communication under a cellular network |
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