CN104104476A - D2D data transmission method - Google Patents
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Abstract
The invention discloses a D2D data transmission method which utilizes a downlink source of a cellular system to perform D2D transmission. Through avoiding performing D2D data transmission on sub-frames for transmitting synchronization signals/broadcasting information in the cellular system, the conflict problem of the cellular transmission and the D2D transmission can be effectively solved and the impact on the cellular communication system inflicted by the D2D technology can be reduced. The invention is applicable to the cellular communication system which introduces the D2D technology.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to the data transmission method of a kind of device-to-device (Device to Device, D2D).
Background technology
In existing LTE system, transfer of data between two subscriber equipmenies (UE) is all by transferring realization in network side, and first transmitting terminal UE will send to network side by communication data, afterwards network side again by this data retransmission to receiving terminal UE.
In actual applications, there is the application scenarios of transmitting terminal UE and receiving terminal UE close together, in this situation, between two UE, can directly communicate, and adopt the data transfer mode in existing LTE system, the communication data between two UE still needs just can issue the other side through the transmission of network side, and obviously, this will cause the reduction of network resource usage efficiency and the increase of control signal.
For the problem of above-mentioned scene, D2D technology has been proposed at present, an important idea of this technology is exactly can directly transmit communication data between two UE, and no longer needs network side to carry out transfer.Introduce the load that D2D technology can reduce network side, reduce the propagation delay time of data, in addition due to two UE close together, can effectively reduce the transmitting power of UE, reduce the interference to other users, realize energy-conservation object simultaneously.In order to be different from this D2D transmission technology, hereinafter referred to as original transmission means, be cellular transmission.
Controlled in order to guarantee network, can the central controlled D2D transmission technology of Adoption Network side.In this technology, network side has the ability to control whole D2D transmitting procedure, by network side, by control signal, controlled foundation, maintenance and the dispose procedure of D2D transmission, and business datum is directly transmitted between two UE.By the central controlled D2D transmission of network side as shown in Figure 1.
Because system has been introduced after D2D technology, base station is only responsible for the transmission of control signal and is controlled, business datum is directly transmitted between UE, and two inter-entity that existing cellular transmission method is applicable to directly communicate (as between base station and UE) are both carried out the transmitting-receiving of data and are carried out the situation of the transmitting-receiving of corresponding control signal simultaneously, therefore, in D2D technology, can not directly continue to use cellular transmission method.
A kind of data transmission method that has been applicable to introduce the cellular communication system of D2D technology is not yet proposed at present.
Summary of the invention
In view of this, main purpose of the present invention is to provide the data transmission method of a kind of D2D, and the method has been applicable to introduce in the cellular communication system of D2D technology.
In order to achieve the above object, the technical scheme that the present invention proposes is:
A data transmission method of D2D, comprising:
A, base station are notified default D2D re-transmission period T to the user equipment (UE) in network in advance, described T=nZ, and wherein, n is more than or equal to 2 natural number, and Z is the duration of a radio frames;
B, when needing to carry out D2D transfer of data between two subscriber equipmenies, transmitting terminal UE1 selects in the available descending sub frame except specified scope for just passing the subframe t1 of described D2D data from current wireless frame, and according to described re-transmission period T and described subframe t1, determine the descending sub frame t4 again using to receiving terminal UE2 transmission data, described specified scope comprises: the descending sub frame that cellular transmission synchronizing signal and broadcast message are shared;
C, described UE1 send to receiving terminal UE2 at described subframe t1 by described D2D data;
D, described UE2 receive after described D2D data, by corresponding ACK/NACK information reporting to base station;
Process according to the described ACK/NACK information receiving e, described base station, and according to described re-transmission period T and subframe t1, determine and send the descending sub frame t3 that authorization message corresponding to described result need to be used, and at described subframe t3, described authorization message is sent to described UE1 or described UE1 and UE2; Described subframe t3 is positioned at before described subframe t4 an at least descending sub frame of d millisecond, and described d is default processing delay coefficient;
F, when described result, indicate described UE1 need to be to described UE2 transmission data time, if described base station does not send described authorization message to described UE2 at described subframe t3, base station sends described authorization message to described UE2 at described subframe t4;
G, when described UE1 judges need to transmit data to UE2 time according to the described authorization message receiving, described UE1 sends corresponding data at described subframe t4 to described UE2.
In sum, the data transmission method of a kind of D2D that the present invention proposes, utilize the downlink resource of cellular system to carry out the transmission of D2D, by avoiding at cellular system for sending the transmission of carrying out D2D data in the subframe of synchronizing signal and broadcast message, the problem of conflicting that can effectively avoid cellular transmission to transmit with D2D, reduce the impact of D2D technology on cellular communication system, so the present invention has been applicable to introduce in the cellular communication system of D2D technology.
Accompanying drawing explanation
Fig. 1 is the central controlled D2D transmission of network side schematic diagram;
Fig. 2 is D2D transmission and the parallel network diagram occurring of cellular transmission;
Fig. 3 is the schematic flow sheet of the embodiment of the present invention one.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
At cellular system, introduced after D2D technology, UE may carry out D2D transmission and cellular transmission simultaneously, such as UE is transmitting by D2D from the UE downloading data of opposite end, by cellular transmission and other UE, to converse, D2D transmission and the parallel network occurring of cellular transmission are as shown in Figure 2.For the business data transmission in cellular transmission, can avoid occurring in the situation of synchronization cellular transmission and D2D transmission collision by the scheduling of Cellular Networks, and synchronizing signal and broadcast message in cellular transmission, because its subframe taking is fixed, cannot avoid by the scheduling of Cellular Networks the appearance of above-mentioned conflict, therefore, in this situation, need to control D2D transmission, to reduce its impact on cellular transmission.
Based on above-mentioned consideration, core concept of the present invention is: utilize the downlink resource of cellular system to carry out D2D transmission, and when carrying out D2D transmission, avoid using cellular transmission synchronizing signal and the shared subframe of broadcast message, like this, just can reduce the impact of D2D transmission on cellular transmission.
Fig. 3 is the schematic flow sheet of the embodiment of the present invention one, and as shown in Figure 3, the data transmission method of the D2D that this embodiment realizes mainly comprises:
Step 301, base station are notified default D2D re-transmission period T to the subscriber equipment in network in advance.
Here, for fear of conflicting with cellular transmission, will D2D re-transmission period T be set according to T=nZ, wherein, n is more than or equal to 2 natural number, and Z is the duration of a radio frames.
Preferably, when system ascending-descending subframes is configured to configure 5, described T can be set to 20ms.When system uplink-downlink configuration is not that while configuring 5, described T can be set to be greater than 20ms.Longer when D2D re-transmission period T setting, can support more D2D transmission process, fully to improve the utilization ratio of D2D resource.
Step 302, when needing to carry out D2D transfer of data between two subscriber equipmenies, transmitting terminal UE1 selects in the available descending sub frame except specified scope for just passing the subframe t1 of described D2D data from current wireless frame, and according to described re-transmission period T and described subframe t1, determine the descending sub frame t4 again using to receiving terminal UE2 transmission data, described specified scope comprises: the descending sub frame that cellular transmission synchronizing signal and broadcast message are shared.
In this step, from current wireless frame, in the available descending sub frame except specified scope, select for just passing the subframe t1 of described D2D data, can guarantee not conflict with synchronizing signal/broadcast message transmission of cellular transmission when D2D data are transmitted first, to avoid the impact of D2D transfer of data on cellular transmission.Particularly, consider in existing cellular communication, subframe 0,1,5 and 6 is that its synchronizing signal/broadcast message is shared, therefore, here need in the available descending sub frame except subframe 0,1,5 and 6, select for just passing the subframe t1 of described D2D data, like this, subframe 0,1,5 and 6 will be for receiving synchronizing signal/broadcast message.
In addition, here when determining the descending sub frame adopting while again transmitting D2D data, according to re-transmission period T and subframe t1, obtain, be t2=t1+T, due to T=nZ, therefore, in the time of can guaranteeing again to transmit D2D data, do not conflict with synchronizing signal/broadcast message transmission of cellular transmission, to avoid the impact of D2D transfer of data on cellular transmission.
Step 303, described UE1 send to receiving terminal UE2 at described subframe t1 by described D2D data.
Here, consider to avoid the synchronizing signal/broadcast message transmission collision with cellular transmission owing to determining subframe t1 in step 302, therefore, at subframe t1, only can carry out D2D transfer of data.
Step 304, described UE2 receive after described D2D data, by corresponding ACK/NACK information reporting to base station.
Here, described UE2 receives after described D2D data, at subframe t2 by corresponding ACK/NACK information reporting to base station.Wherein, the relation of described subframe t2 and described subframe t1, with existing LTE system, meets in LTE system and sends data and the timing requirement of feeding back corresponding ACK/NACK information at sub-frame of uplink at descending sub frame.
Process according to the described ACK/NACK information receiving step 305, described base station, and according to described re-transmission period T and subframe t1, determine and send the descending sub frame t3 that authorization message corresponding to described result need to be used, and at described subframe t3, described authorization message is sent to described UE1 or described UE1 and UE2.
Here, consider the processing delay that the data of UE send, need to described subframe t3 be set to be positioned at before described subframe t4 an at least descending sub frame of d millisecond.Described d is default processing delay coefficient, and in actual applications, the processing delay that need to send data according to UE arranges its concrete value, so that UE has time enough to complete the preparation that data send after obtaining the authorization.Preferably, this d value can be set to 4ms.
Preferably, for make to authorize and the time delay of transfer of data relatively little, can described subframe t3 be set to be positioned at the described subframe t4 nearest descending sub frame of t4 described in the descending sub frame middle distance of d millisecond at least before.
Here it should be noted that, when needs carry out D2D transfer of data, base station need to carry out the subframe of D2D transfer of data by being and the downlink resource information of distribution is notified to data sending terminal and receiving terminal (authorizing), in actual applications, base station need to tell that by authorization message to transmitting terminal be UE1 at subframe t3, for receiving terminal UE2, can authorize at subframe t3, also can authorize at subframe t4.
Step 306, when described result, indicate described UE1 need to be to described UE2 transmission data time, if described base station does not send described authorization message to described UE2 at described subframe t3, base station sends described authorization message to described UE2 at described subframe t4.
In this step, it can be specifically just to pass data or also can data retransmission that UE1 need to transmit data to UE2,
Here it should be noted that, if do not send out authorization message to UE2 at subframe t3, need to send at subframe t4, so that UE2 receives D2D data on corresponding descending sub frame.
Step 307, when described UE1 judges need to transmit data to UE2 time according to the described authorization message receiving, described UE1 sends corresponding data at described subframe t4 to described UE2.
Here, the data of transmission can be data retransmissions again, can be also new datas.
Pass through technique scheme, can find out that the present invention utilizes descending sub frame to realize the transfer of data of D2D, and when determining transmission data, avoid using the shared subframe of synchronizing signal/broadcast message of cellular transmission, thereby realize can be parallel with cellular transmission D2D transmission.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a data transmission method of D2D, is characterized in that, comprising:
A, base station are notified default D2D re-transmission period T to the user equipment (UE) in network in advance, described T=nZ, and wherein, n is more than or equal to 2 natural number, and Z is the duration of a radio frames;
B, when needing to carry out D2D transfer of data between two subscriber equipmenies, transmitting terminal UE1 selects in the available descending sub frame except specified scope for just passing the subframe t1 of described D2D data from current wireless frame, and according to described re-transmission period T and described subframe t1, determine the descending sub frame t4 again using to receiving terminal UE2 transmission data, described specified scope comprises: the descending sub frame that cellular transmission synchronizing signal and broadcast message are shared;
C, described UE1 send to receiving terminal UE2 at described subframe t1 by described D2D data;
D, described UE2 receive after described D2D data, by corresponding ACK/NACK information reporting to base station;
Process according to the described ACK/NACK information receiving e, described base station, and according to described re-transmission period T and subframe t1, determine and send the descending sub frame t3 that authorization message corresponding to described result need to be used, and at described subframe t3, described authorization message is sent to described UE1 or described UE1 and UE2; Described subframe t3 is positioned at before described subframe t4 an at least descending sub frame of d millisecond, and described d is default processing delay coefficient;
F, when described result, indicate described UE1 need to be to described UE2 transmission data time, if described base station does not send described authorization message to described UE2 at described subframe t3, base station sends described authorization message to described UE2 at described subframe t4;
G, when described UE1 judges need to transmit data to UE2 time according to the described authorization message receiving, described UE1 sends corresponding data at described subframe t4 to described UE2.
2. method according to claim 1, it is characterized in that, UE2 described in steps d receives after described D2D data, at subframe t2 by corresponding ACK/NACK information reporting to base station, wherein, the relation of described subframe t2 and described subframe t1 meets the timing requirement that sends data and feed back corresponding ACK/NACK information at sub-frame of uplink at descending sub frame in LTE system.
3. method according to claim 2, is characterized in that, when system ascending-descending subframes is configured to configure 5, described T is 20ms.
4. method according to claim 2, is characterized in that, when the configuration of system ascending-descending subframes is not that while configuring 5, described T is greater than 20ms.
5. method according to claim 1, is characterized in that, described subframe t3 is positioned at before described subframe t4 at least the nearest descending sub frame of t4 described in the descending sub frame middle distance of d millisecond.
6. method according to claim 1, is characterized in that, described 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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| WO2017067208A1 (en) * | 2015-10-20 | 2017-04-27 | 华为技术有限公司 | Method of performing direct communication between stations in wireless local area network and associated equipment |
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| US11082923B2 (en) | 2015-10-20 | 2021-08-03 | Huawei Technologies Co., Ltd. | Method for direct communication between stations in wireless local area network and related device |
| WO2020063222A1 (en) * | 2018-09-28 | 2020-04-02 | 维沃移动通信有限公司 | Transmission processing method, terminal and control node |
| 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 |
| US11800400B2 (en) | 2018-09-28 | 2023-10-24 | Vivo Mobile Communication Co., Ltd. | Transmission collision processing method, terminal, and control node |
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