CN103874187A - Uplink and downlink timing confirmation method in device-to-device transmission - Google Patents
Uplink and downlink timing confirmation method in device-to-device transmission Download PDFInfo
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- CN103874187A CN103874187A CN201210532108.6A CN201210532108A CN103874187A CN 103874187 A CN103874187 A CN 103874187A CN 201210532108 A CN201210532108 A CN 201210532108A CN 103874187 A CN103874187 A CN 103874187A
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Abstract
The invention discloses an uplink and downlink timing confirmation method in D2D transmission. A terminal acquires uplink timing and downlink timing of the terminal in cellular transmission; and the uplink timing and the downlink timing in the D2D transmission are confirmed according the acquired uplink timing and the downlink timing in the cellular transmission. With application of the scheme, correct transmission of D2D data can be ensured.
Description
Technical field
The equipment that the present invention relates to is to device transmission technology, and particularly a kind of equipment is determined method to the up-downgoing timing in device transmission.
Background technology
At Long Term Evolution (LTE, Long Term Evolution) in system, transfer of data between two terminals (UE) is all to realize by the relaying of network side, be that first transmit leg UE sends the data to network side, and then by network side by the data retransmission receiving to recipient UE, even if the distance between two UE is very near, also need could realize transfer of data to each other by the relaying of network side.
For this reason, the equipment of having introduced again in prior art is to equipment (D2D, Device to Device) transmission technology, the introducing of this technology is exactly the scene for transmit leg UE and recipient UE close together, now between two UE, can directly transmit data, without carrying out relaying by network side again.The introducing of D2D transmission technology can reduce the load of network side, and due to close together between two UE, therefore can effectively reduce the transmitting power of UE, thereby reach energy-conservation object.In order to distinguish with D2D transmission, original transmission means is called to cellular transmission.
In addition, controlled in order to guarantee network, the all right central controlled D2D transmission technology of Adoption Network side, be that network side has the ability to control whole D2D transmitting procedure, specifically, the foundation, maintenance and the dispose procedure that are transmitted by control signal control D2D by network side, and D2D business datum is directly transmitted between two UE.Fig. 1 is by the central controlled D2D transmission means of network side schematic diagram.
After having introduced D2D transmission technology, UE may carry out D2D transmission and cellular transmission simultaneously, if UE is transmitting by D2D from the UE downloading data of opposite end, converses by cellular transmission and other UE.Fig. 2 is D2D transmission and the parallel mode schematic diagram carrying out of cellular transmission.
Because the transmission of wireless signal exists time delay, therefore, the UE in wireless communication system need to safeguard descending timing and up timing.Beginning and the finish time of descending sub frame determined in descending timing for UE, beginning and the finish time that UE receives, also can be described as and receive timing; Beginning and the finish time of sub-frame of uplink determined in up timing for UE, beginning and the finish time that UE sends, also can be described as and send timing.
Fig. 3 is the up-downgoing timing relationship schematic diagram of UE in Frequency Division Duplexing (FDD) (FDD, Frequency Division Duplexing) system.As shown in Figure 3, due to the propagation delay time of wireless signal, in the time that the downstream signal of evolved base station (eNB) arrives UE, be equivalent to postpone time T, suppose that the distance between UE and eNB is L, the value of T is approximately L/c, wherein, the propagation velocity that c is wireless signal, i.e. light velocity 3*10
8m/s; From the angle of UE, it can think that the 0th work song frame is from T
0+ T the moment starts, and correspondingly, the 1st work song frame is from T
0+ T+1ms the moment starts, and by that analogy, T is that UE is by carrying out down-going synchronous acquisition with eNB; On up direction, in order to guarantee that the upward signal of UE arrives the moment of eNB and the up timing of eNB is corresponding, UE need to send upstream data by lead pre-set time (TA, Timing Advance) duration on the basis of descending timing, and the value of TA is 2T; ENB can, for it configures initial TA in the random access procedure of UE, adjust TA by media interviews control (MAC, Media Access Control) unit, for guaranteeing that UE can have correct up timing afterwards.
In D2D transmission, equally, transmit leg UE needs maintaining uplink timing for determining when transmission data, recipient UE need to safeguard that descending timing is for determining when reception data, the moment that arrives recipient UE according to the data of up timed sending need to be corresponding with descending timing, thereby guarantee the correct transmission of D2D data.But, in prior art, also there is no a kind of method about the up-downgoing timing in how to confirm D2D transmission, thereby cannot guarantee the correct transmission of D2D data.
Summary of the invention
In view of this, method is determined in the up-downgoing timing the invention provides in a kind of D2D transmission, can guarantee the correct transmission of D2D data.
For achieving the above object, technical scheme of the present invention is achieved in that
A method is determined in up-downgoing timing in D2D transmission, comprising:
Terminal is obtained from up timing and the descending timing in cellular transmission;
Determine up timing and the descending timing in D2D transmission according to the up timing in cellular transmission getting and descending timing.
Visible, adopt scheme of the present invention, can utilize the up-downgoing timing of cellular transmission to determine the up-downgoing timing of D2D transmission, thereby can guarantee the correct transmission of D2D data; And, avoided the special securing mechanism for D2D Transmission Design up-downgoing timing, thereby reduced the implementation complexity of D2D communication system.
Accompanying drawing explanation
Fig. 1 is by the central controlled D2D transmission means of network side schematic diagram.
Fig. 2 is D2D transmission and the parallel mode schematic diagram carrying out of cellular transmission.
Fig. 3 is the up-downgoing timing relationship schematic diagram of UE in FDD system.
Fig. 4 is the flow chart that embodiment of the method is determined in the up-downgoing timing in D2D transmission of the present invention.
Fig. 5 is the position relationship schematic diagram between eNB and two UE under certain scene.
Fig. 6 is the timing relationship schematic diagram corresponding to position relationship shown in Fig. 5 in the situation one of mode one.
Fig. 7 is the timing relationship schematic diagram corresponding to position relationship shown in Fig. 5 in the situation two of mode one.
Fig. 8 is the timing relationship schematic diagram corresponding to position relationship shown in Fig. 5 in the situation one of mode two.
Fig. 9 is the timing relationship schematic diagram corresponding to position relationship shown in Fig. 5 in the situation two of mode two.
Figure 10 is cellular transmission and the parallel mode schematic diagram carrying out of D2D transmission in single carrier FDD system.
Figure 11 is cellular transmission and the parallel mode schematic diagram carrying out of D2D transmission in single carrier TDD system.
Embodiment
For make technical scheme of the present invention clearer, understand, referring to the accompanying drawing embodiment that develops simultaneously, the detailed description further that scheme of the present invention is done.
Fig. 4 is the flow chart that embodiment of the method is determined in the up-downgoing timing in D2D transmission of the present invention.As shown in Figure 4, comprising:
Step 41:UE is obtained from up timing and the descending timing in cellular transmission.
In the central controlled D2D transmission technology of network side, first UE needs and between eNB, sets up honeycomb to be connected, and then eNB could be connected D2D is transmitted and controlled by honeycomb.UE, in the time setting up honeycomb connection, can be obtained from up timing and the descending timing in cellular transmission according to current mechanism.
Step 42:UE determines up timing and the descending timing in D2D transmission according to the up timing in cellular transmission getting and descending timing.
In actual applications, this step at least can have following two kinds of implementations.
One) mode one
In which, the up-downgoing timing of D2D transmission is all used the descending timing of cellular transmission, in the transmit leg UE and recipient UE as D2D transmission both sides, transmit leg UE is using the descending timing from cellular transmission as the up timing in D2D transmission, and recipient UE is using the descending timing from cellular transmission as the descending timing in D2D transmission.
Fig. 5 is the position relationship schematic diagram between eNB and two UE under certain scene.As shown in Figure 5, the distance between UEl and eNB is L1, and the distance between UE2 and eNB is L2, and L2 is greater than Ll, and the distance between UEl and UE2 is D, and c represents the light velocity.
By two kinds of situations that may exist, the feasibility of which is analyzed below.
1) situation one: UE2 sends D2D data to UE1
Fig. 6 is the timing relationship schematic diagram corresponding to position relationship shown in Fig. 5 in the situation one of mode one.As shown in Figure 6, UE2 is using the descending timing from cellular transmission as the up timing in D2D transmission, and UE1 is using the descending timing from cellular transmission as the descending timing in D2D transmission.
As can be seen from Figure 6 the time difference T_1 between moment and the descending timing of UEl in D2D transmission of the D2D data arrival UEl that, UE2 sends is:
T_1＝D/c+(T2-T1)；
By L1=T1*c and L2=T2*c substitution above formula respectively, and can obtain according to the theorem of " difference on triangle both sides is less than the 3rd limit ":
T_1＝(L2-L1+D)/c＜2D/c；
In addition, likely eNB, UE1 and UE2 are positioned on straight line,, will have between eNB and UE2 time as UE1:
(L2-L1+D)/c＝2D/c；
To sum up, can obtain:
T_1＝(L2-L1+D)/c＜＝2D/c。
Consider in the scene of D2D transmission, close together between two UE, therefore can think to be line-of-sight transmission between the two, can not consider the impact of multidiameter delay.In addition, by OFDM (OFDM, Orthogonal Frequency Division Multiplexing) system principle is known, if T_1 is less than the Cyclic Prefix (CP of OFDM symbol, Cyclic Prefix), recipient can eliminate OFDM intersymbol interference, does not affect the quality of reception.
In LTE system, the minimum value of CP is 4.7*10
-6s, order: 2D/c=4.7*10
-6s, can obtain: D=705m.
Can find out, in this case, as long as the distance between two UE is not more than 705m, the value of T_1 will be less than CP, thereby does not affect recipient's the quality of reception.
2) situation two: UE1 sends D2D data to UE2
Fig. 7 is the timing relationship schematic diagram corresponding to position relationship shown in Fig. 5 in the situation two of mode one.As shown in Figure 7, UE1 is using the descending timing from cellular transmission as the up timing in D2D transmission, and UE2 is using the descending timing from cellular transmission as the descending timing in D2D transmission.
As can be seen from Figure 7 the time difference T_2 between moment and the descending timing of UE2 in D2D transmission of the D2D data arrival UE2 that, UE1 sends is:
T_2＝D/c-(T2-T1)＝[D-(L2-L1)]/c；
Due to: 0 < L2-L1 <=D, therefore can obtain:
0＜＝T_2＜D/c；
Make D/c=4.7*10
-6s, can obtain: D=1410m.
Can find out, in this case, as long as the distance between two UE is not more than 1410m, the value of T_2 will be less than CP, thereby does not affect recipient's the quality of reception.
Comprehensively can find out the analysis of above two kinds of situations, as long as the distance between two UE in D2D transmission is not more than 705m, the up-downgoing timing of determining according to mode one can practical requirement, and consider that the distance between two UE in D2D transmitting scene generally all can be closer, conventionally can not exceed 705m, therefore mode one is feasible.
Two) mode two
In which, the up-downgoing timing of D2D transmission is all used the up timing of cellular transmission, in the transmit leg UE and recipient UE as D2D transmission both sides, transmit leg UE is using the up timing from cellular transmission as the up timing in D2D transmission, and recipient UE is using the up timing from cellular transmission as the descending timing in D2D transmission.
By two kinds of situations that may exist, the feasibility of which is analyzed below.
1) situation one: UE2 sends D2D data to UE1
Fig. 8 is the timing relationship schematic diagram corresponding to position relationship shown in Fig. 5 in the situation one of mode two.As shown in Figure 8, UE2 is using the up timing from cellular transmission as the up timing in D2D transmission, and UE1 is using the up timing from cellular transmission as the descending timing in D2D transmission.
As can be seen from Figure 8, time difference T_3 and T_2 between moment and the descending timing of UE1 in D2D transmission of the D2D data arrival UE1 that UE2 sends are identical, correlation analysis based on to T_2 is known, and now the ultimate range between supported two UE is 1410m.
2) situation two: UE1 sends D2D data to UE2
Fig. 9 is the timing relationship schematic diagram corresponding to position relationship shown in Fig. 5 in the situation two of mode two.As shown in Figure 9, UE1 is using the up timing from cellular transmission as the up timing in D2D transmission, and UE2 is using the up timing from cellular transmission as the descending timing in D2D transmission.
As can be seen from Figure 9, time difference T_4 and T_1 between moment and the descending timing of UE2 in D2D transmission of the D2D data arrival UE2 that UE1 sends are identical, correlation analysis based on to T_1 is known, and now the ultimate range between supported two UE is 705m.
Comprehensively can find out the analysis of above two kinds of situations, as long as the distance between two UE in D2D transmission is not more than 705m, the up-downgoing timing of determining according to mode two can practical requirement, and consider that the distance between two UE in D2D transmitting scene generally all can be closer, conventionally can not exceed 705m, therefore mode two is feasible.
Below in conjunction with the different system in practical application, scheme of the present invention is described in further detail.
One) single-carrier system
In single-carrier system, same carrier wave is shared in cellular transmission and D2D transmission, and in order cellular transmission not to be impacted, the timing of D2D transmission need to be subject to the restriction of the timing of cellular transmission.
Figure 10 is cellular transmission and the parallel mode schematic diagram carrying out of D2D transmission in single carrier frequency division duplex (FDD, Frequency Division Duplexing) system.As shown in figure 10, on the 2nd, 3 work song frames, UE2 sends D2D data on cellular downlink frequency band, UE1 receives D2D data on cellular downlink frequency band, in order parallel cellular downlink transmission not to be impacted, up timing and the UE1 descending timing in D2D transmission of UE2 in D2D transmission all used the descending timing in each comfortable cellular transmission.
In addition, on the 2nd, 3 work song frames, UE1 sends D2D data in honeycomb upstream band, UE2 receives D2D data in honeycomb upstream band, in order parallel honeycomb uplink not to be impacted, up timing and the UE2 descending timing in D2D transmission of UE1 in D2D transmission all used the up timing in each comfortable cellular transmission.
Figure 11 is cellular transmission and the parallel mode schematic diagram carrying out of D2D transmission in single carrier time division duplex (TDD, Time Division Duplexing) system.As shown in figure 11, to adopt the configuration 3 of TDD ascending-descending subframes as example, on the 4th work song frame (original honeycomb sub-frame of uplink), UE2 sends D2D data, UE1 receives D2D data, up timing and the UE1 descending timing in D2D transmission of UE2 in D2D transmission all can be used the up timing in each comfortable cellular transmission, also can use the descending timing in each comfortable cellular transmission.
On the 6th, 7 work song frames (original cellular downlink subframe), UE1 sends D2D data, UE2 receives D2D data, in order the cellular downlink of the 5th work song frame not to be transmitted and to be impacted, up timing and the UE2 descending timing in D2D transmission of UE1 in D2D transmission all used the descending timing in each comfortable cellular transmission.
Can find out from above analysis, preferably, in order to guarantee that D2D transmission does not affect parallel cellular transmission, the timing that the timing of D2D transmission should be continued to use original cellular transmission corresponding in used sub-frame resources.
Specifically, in single carrier FDD system, if what D2D transmission was used is cellular downlink frequency band, transmit leg UE is using the descending timing from cellular transmission as the up timing in D2D transmission, and recipient UE is using the descending timing from cellular transmission as the descending timing in D2D transmission;
In single carrier FDD system, if what D2D transmission was used is honeycomb upstream band, transmit leg UE is using the up timing from cellular transmission as the up timing in D2D transmission, and recipient UE is using the up timing from cellular transmission as the descending timing in D2D transmission;
In single carrier TDD system, if what D2D transmission was used is original cellular downlink subframe, transmit leg UE is using the descending timing from cellular transmission as the up timing in D2D transmission, and recipient UE is using the descending timing from cellular transmission as the descending timing in D2D transmission;
In single carrier TDD system, if what D2D transmission was used is original honeycomb sub-frame of uplink, transmit leg UE is using the up timing from cellular transmission as the up timing in D2D transmission, and recipient UE is using the up timing from cellular transmission as the descending timing in D2D transmission.
Two) multicarrier system
In multicarrier system, cellular transmission is used different carrier waves from D2D transmission, and therefore the timing of D2D transmission can not be subject to the restriction of the timing of cellular transmission, that is to say, the up-downgoing timing of D2D transmission can be used the up timing of cellular transmission, also can use the descending timing of cellular transmission.
In addition, the timing relationship of two UE of D2D transmission need to be consistent, for this reason, can adopt the mode of static configuration, according to done static configuration, transmit leg UE is using the descending timing from cellular transmission as the up timing in D2D transmission, recipient UE is using the descending timing from cellular transmission as the descending timing in D2D transmission, or, transmit leg UE is using the up timing from cellular transmission as the up timing in D2D transmission, recipient UE is using the up timing from cellular transmission as the descending timing in D2D transmission, in addition, can also adopt the mode of dynamic-configuration, according to the honeycomb control signal that is received from eNB, transmit leg UE is using the descending timing from cellular transmission as the up timing in D2D transmission, recipient UE is using the descending timing from cellular transmission as the descending timing in D2D transmission, or, transmit leg UE is using the up timing from cellular transmission as the up timing in D2D transmission, and recipient UE is using the up timing from cellular transmission as the descending timing in D2D transmission.
So far, completed the introduction about step 42.
After execution of step 42, transmit leg UE can be according to the up timed sending D2D data in D2D transmission of determining, and recipient UE can receive D2D data according to the descending timing in D2D transmission of determining.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (8)
1. equipment is determined a method to the up-downgoing timing in equipment D2D transmission, it is characterized in that, comprising:
Terminal is obtained from up timing and the descending timing in cellular transmission;
Determine up timing and the descending timing in D2D transmission according to the up timing in cellular transmission getting and descending timing.
2. method according to claim 1, is characterized in that,
The described up timing being obtained from cellular transmission comprises with descending timing: be connected the up timing and the descending timing that are obtained from cellular transmission by honeycomb.
3. method according to claim 1, is characterized in that, up timing and descending timing that the up timing in cellular transmission that described basis gets and descending timing are determined in D2D transmission comprise:
Sending side terminal is using the descending timing from cellular transmission as the up timing in D2D transmission;
Receiving side terminal is using the descending timing from cellular transmission as the descending timing in D2D transmission;
Or,
Sending side terminal is using the up timing from cellular transmission as the up timing in D2D transmission;
Receiving side terminal is using the up timing from cellular transmission as the descending timing in D2D transmission.
4. method according to claim 3, is characterized in that,
In single carrier frequency division duplex FDD system,
If what D2D transmission was used is cellular downlink frequency band, sending side terminal is using the descending timing from cellular transmission as the up timing in D2D transmission, and receiving side terminal is using the descending timing from cellular transmission as the descending timing in D2D transmission;
If what D2D transmission was used is honeycomb upstream band, sending side terminal is using the up timing from cellular transmission as the up timing in D2D transmission, and receiving side terminal is using the up timing from cellular transmission as the descending timing in D2D transmission.
5. method according to claim 3, is characterized in that,
In single carrier TDD system,
If what D2D transmission was used is original cellular downlink subframe, sending side terminal is using the descending timing from cellular transmission as the up timing in D2D transmission, and receiving side terminal is using the descending timing from cellular transmission as the descending timing in D2D transmission;
If what D2D transmission was used is original honeycomb sub-frame of uplink, sending side terminal is using the up timing from cellular transmission as the up timing in D2D transmission, and receiving side terminal is using the up timing from cellular transmission as the descending timing in D2D transmission.
6. method according to claim 3, is characterized in that,
In multicarrier system, according to done static configuration, sending side terminal is using the descending timing from cellular transmission as the up timing in D2D transmission, and receiving side terminal is using the descending timing from cellular transmission as the descending timing in D2D transmission; Or sending side terminal is using the up timing from cellular transmission as the up timing in D2D transmission, receiving side terminal is using the up timing from cellular transmission as the descending timing in D2D transmission.
7. method according to claim 3, is characterized in that,
In multicarrier system, according to the honeycomb control signal that is received from evolved base station eNB, sending side terminal is using the descending timing from cellular transmission as the up timing in D2D transmission, and receiving side terminal is using the descending timing from cellular transmission as the descending timing in D2D transmission; Or sending side terminal is using the up timing from cellular transmission as the up timing in D2D transmission, receiving side terminal is using the up timing from cellular transmission as the descending timing in D2D transmission.
8. method according to claim 1 and 2, is characterized in that, the up timing in cellular transmission that described basis gets and descending timing further comprise after determining the up timing and descending timing in D2D transmission:
Sending side terminal is according to the up timed sending D2D data in D2D transmission of determining, and receiving side terminal receives D2D data according to the descending timing in D2D transmission of determining.
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| CN110461036A (en) * | 2014-09-25 | 2019-11-15 | 华为技术有限公司 | A kind of method and terminal for emitting, receiving synchronization signal |
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| C06 | Publication | ||
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Application publication date: 20140618 |