CN104104476B - A kind of D2D data transmission method - Google Patents
A kind of D2D data transmission method Download PDFInfo
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- CN104104476B CN104104476B CN201310116823.6A CN201310116823A CN104104476B CN 104104476 B CN104104476 B CN 104104476B CN 201310116823 A CN201310116823 A CN 201310116823A CN 104104476 B CN104104476 B CN 104104476B
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Abstract
This application discloses a kind of D2D data transmission method, this method carries out D2D transmission using the downlink resource of cellular system, by avoiding being used to send the transmission of progress D2D data in the subframe of synchronizing signal/broadcast message in cellular system, it is possible to prevente effectively from cellular transmission and D2D transmit the problem of conflict, reduce influence of the D2D technologies to cellular communication system.The present invention has been suitable for introduce into the cellular communication system of D2D technologies.
Description
Technical field
The present invention relates to mobile communication technology, more particularly to a kind of device-to-device (Device to Device, D2D)
Data transmission method.
Background technology
In existing LTE system, the data transfer between two user equipmenies (UE) in network side all by transferring
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 directly two inter-entity (between such as base station and UE) that are communicated and both enters line number
According to transmitting-receiving simultaneously carry out corresponding control signaling transmitting-receiving situation, therefore, cellular transmission can not be directly continued to use in D2D technologies
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：
A, base station in advance notify default D2D re-transmission periods T to the user equipment (UE) in network, the T=nZ, its
In, n is the 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 from current radio frames except refer to
Determine to select the subframe t1 for just passing the D2D data in the available descending sub frame outside scope, and week is retransmitted according to described
The phase T and subframe t1, it is determined that transmitting descending sub frame t4, the specified range bag used in data to receiving terminal UE2 again
Include：Descending sub frame shared by cellular transmission synchronizing signal and broadcast message；
The D2D data are sent to receiving terminal UE2 by c, the UE1 in the subframe t1；
D, the UE2 are received after the D2D data, by corresponding ACK/NACK information reportings to base station；
E, the base station are handled according to the ACK/NACK information received, and according to the re-transmission period T and
Subframe t1, it is determined that the descending sub frame t3 that the corresponding authorization message of the result is needed to use is sent, and in the subframe t3
The authorization message is sent to the UE1 or the UE1 and UE2；The subframe t3 be before the subframe t4 extremely
A few d milliseconds descending sub frame, the d is default processing delay coefficient；
F, when the result indicates that the UE1 needs to transmit data to the UE2, if the base station is not in institute
State subframe t3 and send the authorization message to the UE2, then base station sends the authorization message to described in the subframe t4
UE2；
G, 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.
In summary, a kind of D2D proposed by the present invention data transmission method, is carried out using the downlink resource of cellular system
D2D transmission, by avoiding being used to send the biography of progress D2D data in the subframe of synchronizing signal and broadcast message in cellular system
It is defeated, it is possible to prevente effectively from cellular transmission and D2D transmit the problem of conflict, reduce influence of the D2D technologies to cellular communication system,
Therefore the present invention has been suitable for introduce into the cellular communication system of D2D technologies.
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.
After cellular system introduces D2D technologies, UE may carry out D2D transmission and cellular transmission simultaneously, such as UE is logical
Cross D2D transmission from opposite end UE downloading datas while, conversed by cellular transmission with other UE, D2D transmission and honeycomb biography
The defeated network occurred parallel is as shown in Figure 2.It can be kept away for the business data transmission in cellular transmission by the scheduling of Cellular Networks
Exempt to occur in synchronization cellular transmission and the situation of D2D transmission collisions, and synchronizing signal and broadcast message in cellular transmission,
Then because the subframe of its occupancy is fixed, it is impossible to avoid the appearance of above-mentioned conflict by the scheduling of Cellular Networks, therefore, in this case,
Need to be controlled D2D transmission, to reduce its influence to cellular transmission.
Based on above-mentioned consideration, core concept of the invention is：D2D transmission is carried out using the downlink resource of cellular system, and
And when carrying out D2D transmission, avoid using the subframe shared by cellular transmission synchronizing signal and broadcast message, in this manner it is possible to
Reduce influence of the D2D transmission to cellular transmission.
Fig. 3 is the schematic flow sheet of the embodiment of the present invention one, as shown in figure 3, the data for the D2D that the embodiment is realized are passed
Transmission method mainly includes：
Step 301, base station in advance notify default D2D re-transmission periods T to the user equipment in network.
Here, in order to avoid conflicting with cellular transmission, D2D re-transmission period T will be set according to T=nZ, wherein, n is big
In the natural number equal to 2, Z is the duration of a radio frames.
Preferably, when system ascending-descending subframes are configured to configuration 5, the T could be arranged to 20ms.When system up-downgoing
When configuration is not configuration 5, the T could be arranged to be more than 20ms.When D2D re-transmission periods T sets longer, it can support more
D2D transmits process, fully to improve the utilization ratio of D2D resources.
Step 302, when needing to carry out D2D data transfers between two user equipmenies, transmitting terminal UE1 is from current radio frames
In subframe t1 for just passing the D2D data is selected in available descending sub frame in addition to specified range, and according to described
The re-transmission period T and subframe t1, it is determined that descending sub frame t4 used in data is transmitted to receiving terminal UE2 again, it is described to specify
Scope includes：Descending sub frame shared by cellular transmission synchronizing signal and broadcast message.
Selected in available descending sub frame in this step from current radio frames in addition to specified range for just passing institute
State the subframe t1 of D2D data, it can be ensured that transmitted when D2D data are transmitted first with the synchronizing signal/broadcast message of cellular transmission
Do not conflict, to avoid influence of the D2D data transfers to cellular transmission.Specifically, it is contemplated that in existing cellular communication, subframe 0,
1st, 5 and 6 be shared by its synchronizing signal/broadcast message, therefore, to need exist for available descending in addition to subframe 0,1,5 and 6
The subframe t1 for just passing the D2D data is selected in subframe, so, subframe 0,1,5 and 6 will be used to receiving synchronizing signal/
Broadcast message.
In addition, used here when it is determined that being transmitted D2D data again descending sub frame when, be according to re-transmission period
T and subframe t1 is obtained, i.e. t4=t1+T, due to T=nZ, thereby it can be assured that when transmitting D2D data again and honeycomb
The synchronizing signal of transmission/broadcast message transmission does not conflict, to avoid influence of the D2D data transfers to cellular transmission.
The D2D data are sent to receiving terminal UE2 by step 303, the UE1 in the subframe t1.
Here, synchronizing signal/broadcast with cellular transmission is avoided to believe due to determining to consider during subframe t1 in step 302
Transmission collision is ceased, therefore, D2D data transfers can be only carried out in subframe t1.
Step 304, the UE2 are received after the D2D data, by corresponding ACK/NACK information reportings to base station.
Here, the UE2 is received after the D2D data, in subframe t2 by corresponding ACK/NACK information reportings to base station.
Wherein, the subframe t2 and subframe t1 relation is met in LTE system in descending sub frame transmission compared with LTE system
Data and the timing demands in the corresponding ACK/NACK information of sub-frame of uplink feedback.
Step 305, the base station are handled according to the ACK/NACK information received, and retransmit week according to described
Phase T and subframe t1, it is determined that the descending sub frame t3 that the corresponding authorization message of the result is needed to use is sent, and in the son
The authorization message is sent to the UE1 or the UE1 and UE2 by frame t3.
Here, it is contemplated that the processing delay that UE data are sent is, it is necessary to which the subframe t3 is set to be located at the subframe
At least d milliseconds of a descending sub frame before t4.The d be default processing delay coefficient, in actual applications, it is necessary to according to
UE sends the processing delay of data to set its specific value, to cause UE to have time enough to complete data hair after being authorized
The preparation sent.Preferably, the d values could be arranged to 4ms.
Preferably, in order that authorize and data transfer time delay it is relatively small, the subframe t3 can be set to be located at
Descending sub frame nearest t4 described in distance at least d milliseconds of descending sub frame before the subframe t4.
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 downlink resource information of distribution notify to data sending terminal and receiving terminal (being authorized), in actual applications,
Base station needs tell authorization message to transmitting terminal i.e. UE1 in subframe t3, for receiving terminal UE2, can be authorized in subframe t3,
It can be authorized in subframe t4.
Step 306, when the result indicates that the UE1 needs to transmit data to the UE2, if the base station
Do not send the authorization message to the UE2 in the subframe t3, then base station the subframe t4 send the authorization message to
The UE2.
In this step, UE1 needs to pass data at the beginning of being specifically to UE2 transmission data or can also retransmit data,
Explanation is needed exist for, if not sending out authorization message to UE2 in subframe t3, needs to be sent out in subframe t4
Send, so that UE2 receives D2D data on corresponding descending sub frame.
Step 307, when the UE1 according to the authorization message received judge need to UE2 transmit data when, institute
State UE1 and send corresponding data to the UE2 in the subframe t4.
Here, the data transmitted again can retransmit data or new data.
Pass through above-mentioned technical proposal, it can be seen that the present invention realizes D2D data transfer using descending sub frame, and it is determined that
The subframe shared by synchronizing signal/broadcast message using cellular transmission is avoided during transmission data, so that realizing can pass with honeycomb
Defeated parallel D2D transmission.
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 (6)
1. a kind of D2D data transmission method, it is characterised in that including：
A, base station in advance notify default D2D re-transmission periods T to the user equipment (UE) in network, the T=nZ, wherein, n
For the natural number more than or equal to 2, Z is the duration of a radio frames；
B, when needed between two user equipmenies carry out D2D data transfers when, transmitting terminal UE1 from current radio frames except specify model
Select the subframe t1 for just passing the D2D data in available descending sub frame outside enclosing, and according to the re-transmission period T and
The subframe t1, it is determined that transmitting descending sub frame t4 used in data to receiving terminal UE2 again, the specified range includes：Honeybee
Descending sub frame shared by nest synchronous signal transmission and broadcast message；
The D2D data are sent to receiving terminal UE2 by c, the UE1 in the subframe t1；
D, the UE2 are received after the D2D data, by corresponding ACK/NACK information reportings to base station；
E, the base station are handled according to the ACK/NACK information received, and according to the re-transmission period T and subframe
T1, it is determined that the descending sub frame t3 that the corresponding authorization message of the result for sending the processing is needed to use, and will in the subframe t3
The authorization message is sent to the UE1 or UE1 and UE2；The subframe t3 is at least d before the subframe t4
One descending sub frame of millisecond, the d is default processing delay coefficient；
F, when the result indicates that the UE1 needs to transmit data to the UE2, if the base station is not in the son
The frame t3 transmissions authorization message sends the authorization message to the UE2 to the UE2, then base station in the subframe t4；
G, when the UE1 according to the authorization message received judge need to UE2 transmit data when, the UE1 is in institute
State subframe t4 and send corresponding data to the UE2.
2. according to the method described in claim 1, it is characterised in that UE2 described in step d is received after the D2D data, in son
Frame t2 by corresponding ACK/NACK information reportings to base station, wherein, the subframe t2 and the subframe t1 relation meet LTE systems
In system data and the timing demands in the corresponding ACK/NACK information of sub-frame of uplink feedback are sent in descending sub frame.
3. method according to claim 2, it is characterised in that when system ascending-descending subframes are configured to configuration 5, the T
For 20ms.
4. method according to claim 2, it is characterised in that described when the configuration of system ascending-descending subframes is not configuration 5
T is more than 20ms.
5. according to the method described in claim 1, it is characterised in that the subframe t3 is at least d before the subframe t4
Descending sub frame nearest subframe t4 described in distance in the descending sub frame of millisecond.
6. according to the method described in claim 1, it is characterised in that the d is 4ms.
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| CN201310116823.6A CN104104476B (en) | 2013-04-07 | 2013-04-07 | A kind of D2D data transmission method |
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| CN201310116823.6A CN104104476B (en) | 2013-04-07 | 2013-04-07 | A kind of D2D data transmission method |
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| CN104104476B true CN104104476B (en) | 2017-09-08 |
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| CN105657835B (en) * | 2014-11-14 | 2020-03-24 | 联想(北京)有限公司 | Information processing method, electronic equipment and base station |
| CN104486049A (en) * | 2014-12-30 | 2015-04-01 | 宇龙计算机通信科技(深圳)有限公司 | Data receiving state feedback method, data retransmission method and device and terminal |
| CN108028743B (en) * | 2015-09-17 | 2021-06-01 | Lg电子株式会社 | Method and apparatus for transceiving messages from V2X terminal in wireless communication system |
| CN112566181A (en) | 2015-10-20 | 2021-03-26 | 华为技术有限公司 | Method and related device for direct communication between stations in wireless local area network |
| CN110972195A (en) * | 2018-09-28 | 2020-04-07 | 维沃移动通信有限公司 | Transmission processing method, terminal and control node |
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| CN102307060A (en) * | 2011-08-31 | 2012-01-04 | 电信科学技术研究院 | Method and equipment for data transmission |
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| WO2012159270A1 (en) * | 2011-05-25 | 2012-11-29 | Renesas Mobile Corporation | Resource allocation for d2d communication |
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| US8554200B2 (en) * | 2008-09-12 | 2013-10-08 | Nokia Corporation | Method and apparatus for providing interference measurements for device to-device communication |
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Patent Citations (3)
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|---|---|---|---|---|
| WO2012034269A1 (en) * | 2010-09-14 | 2012-03-22 | Nokia Corporation | Interference measurement and reporting for device-to-device communications in communication system |
| WO2012159270A1 (en) * | 2011-05-25 | 2012-11-29 | Renesas Mobile Corporation | Resource allocation for d2d communication |
| CN102307060A (en) * | 2011-08-31 | 2012-01-04 | 电信科学技术研究院 | Method and equipment for data transmission |
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| 《LTE蜂窝系统中的D2D工作模式研究》;徐同刚;《电信快报》;20120630(第6期);第38-41页 * |
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Granted publication date: 20170908 |