CN104812059B - Device-to-device synchronization method suitable for user equipment and user equipment - Google Patents
Device-to-device synchronization method suitable for user equipment and user equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The present disclosure provides a device-to-device (D2D) synchronization method and User Equipment (UE) suitable for the user equipment. In one of the exemplary embodiments, the D2D synchronization method includes: receiving the detected signal from the receiver; obtaining a first signal having first timing information and a second signal having second timing information from the detected signal; determining to forward the first timing information or the second timing information based on an upper power limit constraint of the first signal and the second signal and a power difference between the first signal and the second signal; and deciding whether to transmit third timing information inherent to the UE based on whether the first signal and the second signal are below a power threshold.
Description
Technical field
This disclosure relates to which the device suitable for user equipment is to device synchronous method and user equipment.
Background technology
Device can refer in wireless communication system for user equipment (UE) device (Device to Device, D2D) communication
Directly with the communication means of another UE communication.By convention, when UE transmits the message to another UE, in LTE, base
Stand or evolved node B (evolved Node B, eNB) will between two UE relay message.But D2D is communicated, because two
The user message of a UE directly can be delivered to another UE from a UE, so that the interference of eNB is minimized.
However, in order to keep D2D devices synchronous with network or another peer device, can by D2D synchronizing informations from network or from
Peer device is delivered to each other UE.Therefore, it is transmitted using synchronisation source (synchronization source, SS)
D2D synchronizing signals (D2D synchronization signal, D2DSS) are to enhance Network Synchronization.When network implementation synchronizes D2D
Communication rather than asynchronous D2D communication (wherein, device will blindly search for another device) when, all D2D devices can need basis
Synchronizing signal is registered to network sequence.
Therefore, the equipment of at least two types can be used as synchronisation source.By convention, eNB can be by periodically transmitting
System information (wherein, be arranged primary synchronization signals (primary synchronization signal, PSS) with it is secondary synchronous
Signal (secondary synchronization signal, SSS)) and serve as synchronisation source.When having received PSS/SSS,
Its sequential can be aligned by D2D UE with the sequential of eNB.Moreover, another peer device also acts as synchronisation source.Specifically, any
D2D UE can be used as synchronisation source and transmit the D2DSS that can be received by another D2D UE.
In order to design D2D synchronization schemes, it would be desirable to consider some problem.First, D2D devices can receive several synchronizations simultaneously
Signal.It that case, D2D devices will consider the object itself to be synchronized to.If the selection of D2D devices follows the dress of mistake
It sets, then the sequential of D2D devices is by misalignment.Moreover, referring to sequential when D2D devices receive different two or more
When, then there may be sequential confusion.It that case, D2D devices will be unaware which it should follow and refer to sequential.Its
Secondary, after the selection of D2D devices is with reference to sequential, it is selected with reference to sequential that D2D devices may not be necessary forwarding.
Under any circumstance, D2D synchronous method can be designed to ensure the reliability of network sequence and by potential sequential
Confusion minimizes.
Invention content
Therefore, the disclosure is directed to the device suitable for user equipment to device (D2D) synchronous method and user equipment
(UE)。
In one of in an exemplary embodiment, the disclosure is directed to a kind of D2D synchronous method, it includes：From receiver
Receive detected signal；The first signal with the first timing information is obtained from the detected signal and when with second
The second signal of sequence information；Based on the upper limit of the power of first signal and the second signal constraint and first signal and
Difference power between the second signal determines to forward first timing information or second timing information；And it is based on
Whether all detected signals decide whether to transmit the intrinsic third timing informations of UE less than power threshold.
In one of in an exemplary embodiment, the disclosure is directed to a kind of user equipment, it includes：Conveyer is used for
Transmit wireless signal；Receiver, for receiving wireless signal；And processing circuit, it is couple to the conveyer and the reception
It device and is configured for use in：Detected signal is received from the receiver；It is obtained from the detected signal with first
First signal of timing information and the second signal with the second timing information；Based on first signal and the second signal
The upper limit of the power constraint and the difference power between first signal and the second signal and forward first timing information or
Second timing information；And institute is transmitted by the conveyer less than power threshold in response to all detected signals
State the intrinsic third timing informations of UE.
In order to make the disclosure features described above and advantage it is understood that the exemplary implementation with schema is described in detail below
Example.It should be understood that the above general description and the following detailed description are exemplary, and it is desirable that sheet as claimed is explained further
It is open.
However, it should be understood that the invention content may not contain all aspect and embodiment of the disclosure, and therefore and unexpectedly
Taste is restrictive in any way.Moreover, the disclosure will include to be significantly improved to those of ordinary skill in the art
And modification.
Description of the drawings
Including attached drawing is to further understand the disclosure, and attached drawing is incorporated in this specification and constitutes one of this specification
Point.The schema illustrates embodiment of the disclosure, and together with the description explaining the principle of the disclosure.
Fig. 1 illustrates the example wireless communication system for possessing D2D abilities.
Fig. 2 illustrates that the potential sequential of synchronous D2D wireless communication systems is chaotic.
Fig. 3 A illustrate the device proposed according to one of the exemplary embodiment of the disclosure to device synchronous method.
Fig. 3 B to Fig. 3 C provide two different instances for furtheing elucidate the concept disclosed in Fig. 3 A.
Fig. 4 A to Fig. 4 C illustrate first exemplary scene of the proposed device to device synchronous method.
Fig. 5 illustrates second exemplary scene of the proposed device to device synchronous method.
Fig. 6 illustrates third demonstration scene of the proposed device to device synchronous method.
Fig. 7 illustrates D2D synchronizing signals (D2DSS) trigger flow according to one of the exemplary embodiment of the disclosure
Figure.
Fig. 8 is the flow chart for summarizing proposed device to device synchronous method.
The exemplary UE that Fig. 9 illustrates to execute proposed device to device synchronous method according to functional block diagram.
【Main element label declaration】
101：eNB
102：Small cell base station
103a~103k：UE
211：eNB
212：2nd D2D UE synchronisation sources
213：The D2D UE of sequential confusion
214：First D2D UE synchronisation sources
311：eNB
312：UE
313：UE
314：UE
322：UE
323：UE
324：UE
331：First broadcasting area
332：Second broadcasting area
401：UE0
402：UE1
411：eNB
412：S0
413：S1
420：Imagination label
430：Imagination label
440：Imagination label
501：UE0
502：UE1
511：eNB
512：S0
513：S1
601：UE0
611：eNB
612：S0
901：Processing circuit
902：D/A (D/A)/analog/digital (A/D) converter
903：Conveyer
904：Receiver
905：Antenna element
S111：Control signaling
S112：Conventional cellular communication
S113：It was found that signal
S114：D2D synchronizing signals
S115：D2D is communicated
S201、S203、S301、S302、S303、S304、S305、S306、S701、S702、S703、S704、S801、
S802、S803：Step
dth:Second edge power threshold
RSRPPSS/SSS:The Reference Signal Received Power of primary synchronization signals/secondary synchronizing signal
RSRPD2DSS:Reference Signal Received Power of the device to device synchronizing signal
D2DSS0、D2DSS1、D2DSSR:The device of S0, S1, UE0 are to device synchronizing signal
PeNB、PS0、PS1:The power level of the RSRP of the synchronizing signal of eNB, S0, S1
Pedge:First edge power threshold
Specific implementation mode
With detailed reference to the exemplary embodiment of the disclosure, the example is illustrated in the accompanying drawings.Whenever possible, phase
It is used for indicating same or similar part in schema and description with component symbol.
In order to implement can to synchronize the wireless communication system of D2D communications, it would be desirable to maintain between the UE in wireless network
Synchronization.Therefore, in order to provide the synchronization of D2D UE by wireless network, it is particularly provided in the side of the coverage area of wireless network
Edge nearby or except UE synchronization, the disclosure proposes a kind of device suitable for user equipment to device (D2D) synchronous method
With user equipment (UE), the method is related to the reference sequential for selecting synchronisation source and forwarding to be provided by the synchronisation source.Pass through institute
The method and apparatus of proposition, timing misalignment and sequential confusion will be minimized, so the reliability of the D2D communications of wireless network will
Enhanced.Moreover, the range of the D2D communications of scalable radio network, the side of the coverage area without worrying wireless network
Boundary nearby or except UE synchronous loss.
Fig. 1 illustrates the example wireless communication system for possessing D2D abilities.Example wireless communication system 100 will include to fill
When the base station synchronization source of each cell (cell) at least one evolved node B (evolved Node B, eNB) 101 and by
The group for UE 103a to the 103k that eNB 101 is serviced.UE 103a to 103k, which may include transmitting, such as to be believed by the discovery that S113 is indicated
The D2D UE 103a of number (discovery signal), and also include the UE for serving as cluster head.Cell also may include at least one small
Type cell base station 102.Wireless communication system 100 can be provided the conventional cellular communication such as indicated by S112 by eNB 101
To any UE, such as UE 103b, and wireless communication system 100 may also allow for UE103a to 103k to participate in as indicated by S115
D2D is communicated.Wireless network 100 can be by from eNB 101 or from the control signaling that cluster head UE 103i transmission is such as indicated by S111
Synchronization for D2D communications is provided.Small cell 102 can also be served as by transmitting the D2D synchronizing signals such as indicated by S114
Synchronisation source.
When any one of UE 103a to 103k are moved in the wireless range 150 of eNB 101, UE will be considered as
In network coverage.Otherwise, when any one of UE 103a to 103k are moved outside the wireless range 150 of eNB 101,
UE will be considered as outside network coverage.However, when UE is outside network coverage, another UE may act as covering for network
The repeater of the UE outside lid range.For example, UE 103b can be by being delivered to UE by user data from eNB 101
103c and the repeater for serving as UE 103c.For the UE outside network coverage, another UE can also act as forwarding and be used for network
The cluster head of the network sequence information of the UE outside coverage area.For example, UE 103i may act as UE 103j and UE 103k
Cluster head.However, if UE receives synchronizing information from multiple synchronisation sources simultaneously, it would be possible that generation timing sequence is chaotic.
Fig. 2 illustrates the situation of the sequential confusion of synchronous D2D wireless communication systems.In fig. 2, D2D UE213 can exist simultaneously
In step S201 from the first D2D UE synchronisation sources 214 and when receiving network from the 2nd D2D UE synchronisation sources 212 in step S203
Sequence information (network timing information).Although the first D2D UE synchronisation sources 214 can be synchronous with eNB 211,
The 2nd D2D UE synchronisation sources 212 except the coverage area of eNB 211 can provide the sequential different from D2D UE synchronisation sources 214
Information, therefore D2D UE 213 may generation timing sequence confusion.In order to avoid sequential confusion, ordered pair when UE will need to know its own
Standard arrives any synchronisation source.Moreover, for the range that the D2D of extended wireless network is communicated, UE it may also be desirable to be aware of when to serve as
Sequential transponder, the sequential transponder receives timing information and be forwarded to the timing information may be in network coverage
Near border or other devices outside the boundary of network coverage.
Fig. 3 A illustrate to be proposed according to what the selection of the sequential of one of the exemplary embodiment of the disclosure and sequential forwarded
Process.In step S301, UE will execute the detection to one or more synchronisation sources so that its own sequential to be aligned
To one of the synchronisation source detected.Specifically, from one or more synchronisation sources detect one or one with
After upper synchronizing signal, UE can be selected based on the module of design by its own timing synchronization to what synchronizing signal.Citing
For, the module of design can be by the mean power detected in a period of time, so that UE will be its own sequential
It is registered to a synchronizing signal with highest average power in a period of time.Aforementioned mean power in a period of time
It may refer to the Reference Signal Received Power (reference signal received power, RSRP) of (for example) signal.
For another instance, the relative distance that the module of design can also be between synchronisation source and UE.
In step s 302, UE may determine whether activation sequential forwarding capability.When having activated sequential forwarding capability, UE will
Decide whether that the timing information selected synchronisation source is forwarded to another device.The activation of sequential forwarding capability can be based on selected
The upper limit of the module of the design of synchronisation source constrains the measurement mark designed between selected synchronisation source and another external synchronization source
Accurate gap.When meeting the gap of module of upper limit constraint and design more than a certain threshold value, the sequential forwarding capability of UE
It will be activated.For example, if the module of design is the mean power detected in a period of time, UE
It can decide whether to meet upper limit of the power constraint, that is, whether the mean power of the synchronizing signal of selected synchronisation source detected
Less than first edge power threshold, and UE can also decide detected mean power between selected synchronisation source and another synchronisation source
Whether difference is more than second edge power threshold.Another synchronisation source can be other than the selected synchronisation source one
The synchronisation source of the mean power detected with highest in time cycle.When the difference power for meeting upper limit of the power constraint and being detected
When more than second edge power threshold, UE may act as sequential transponder so that timing information to be forwarded to separately from selected synchronisation source
One external device (ED).Two edge power threshold values referred to above are positive nonzero numbers and would be possible to change in different scenes.
In step S303, if the sequential forwarding capability of UE is not activated, UE will only with selected synchronisation source
Timing synchronization.However, if the sequential forwarding capability of UE has been activated, process is moved to step S304.In step S304
In, the timing information for further determining selected synchronisation source will be actually forwarded by UE, or, UE will serve as other dresses
The independent synchronization source set.In general, if UE is not synchronized to any detected synchronisation source, for example, all detected letters
Number power is less than power threshold, then UE will serve as the independent synchronization source of other devices.In step S305, it is assumed that UE without
Method by ordered pair standard at that time to any detected synchronisation source, then UE will serve as independent synchronization source.In step S306, it is assumed that UE
Sequence it can will be registered to selected synchronisation source at that time, then selected timing information will be forwarded to other devices by UE.Figure
3B and Fig. 3 C provide two different instances of the concept for furtheing elucidate Fig. 3 A.
In fig. 3b it is assumed that the system information comprising PSS and SSS is broadcast to the transmission model positioned at eNB311 by eNB 311
The UE 312 for the edge enclosed, then UE 312 can be forwarded to by the timing information that will be embedded in PSS and SSS in eNB
UE (for example, UE 314) except 311 coverage area and serve as synchronisation source.However, for the transmission range in eNB 311
The UE 312 of edge, the PSS and SSS received from eNB311 will be reliable.If PSS and SSS are unreliable, will be UE
(for example, UE 313) is considered as except the coverage area of eNB 311.UE 313 will be then by the way that intrinsic D2DSS to be transmitted to
UE in the coverage area of UE 313 and serve as independent synchronization source.
Fig. 3 C are another examples for furtheing elucidate Fig. 3 B in more detail.In the example of Fig. 3 C, eNB311 is by broadcast packet
System information signal containing PSS and SSS.In the first broadcasting area 331 of eNB 311, the RSRP of system information signal will surpass
First edge power threshold is crossed, is that upper limit of the power constraint is unmet.Any UE in the first broadcasting area 331 will not
The timing information (for example, PSS/SSS) provided by eNB 311 is relayed to other UE.However, if UE is in the first broadcasting area
Except 331, then the UE will be considered as boundary in the broadcasting area of eNB 311, and can be by the timing information of eNB 311
It is relayed to other UE.Because UE 322 is just except the first broadcasting area 331, UE 322 will be relayed to timing information
UE 323.If UE is except the first broadcasting area 331 but in the second broadcasting area 332, the UE will be considered as
Sufficiently reliable timing information is received, so that timing information can be relayed to other UE by the UE.First broadcasting area 331 with
Region between second broadcasting area 332 can be defined as following region：By the RSRP of the UE system information signals received less than the
One edge power threshold, but third edge power threshold value is higher than by the RSRP of the same UE system information signals received, wherein the
One edge power threshold is more than third edge power threshold value, and two edge power threshold values are all positive nonzero numbers.If UE is in
Except second broadcasting area 332, then the UE does not have sufficiently reliable timing information, so that the UE will not be sequential
Calibration information is forwarded to other UE.For example, in the second broadcasting area 332 and transmission pair can be passed through as the UE 323 in Fig. 3 C
When timing information is supplied to UE324 by standard to the D2DSS of network, the D2DSS received by UE 324 is likely lower than third edge
Power threshold, so that timing information is not forwarded to other UE by UE 324.Fig. 4 to Fig. 7 is by exploring various exemplary scenes
And provide the further details of proposed D2D synchronous method.
Fig. 4 A to Fig. 4 C illustrate first exemplary scene of the proposed device to device synchronous method.Fig. 4 A illustrate various
The signaling diagram of D2D wireless network elements.In Figure 4 A, broadcast is had the PSS/SSS of a power level, the work(by eNB 411
Rate level is expressed as PeNB.In addition to receiving PeNBExcept, UE0401 also can receive D2DSS0, represent the D2DSS from S0412 and
With power level PS0.S0412 can indicate another synchronisation source with the different timing informations from eNB 411, and can be
Another D2D devices except the range of eNB 411.UE0401 also can receive D2DSS1, and represent has power from S1413
Level PS1D2DSS.S1413 can also indicate another synchronisation source with the different timing informations from eNB411 and S0412, and
Can be another D2D devices except the range of eNB 411 and S0412.The D2DSS (D2DSSR) generated by UE0401 will be transmitted
To UE1402.For the first exemplary scene, network-based timing information PSS/SSS is exported into D2DSSR.
Fig. 4 B illustrate the first exemplary scene with further details.For the first exemplary scene, it is assumed that for UE0, PeNB
>PS0>PS1, that is to say, that, it is assumed that UE0401 compared with S0412 closer to eNB411, S0412 compared with S1413 closer to
UE0401 (not shown).If the P of UE0 impressionseNBMore than being designated as Pth1The first power threshold, then UE0401 will be eNB
411 are selected as the synchronisation source of ordered pair standard at that time.If the P of UE0401 impressionseNBMore than first edge power threshold Pedge, then
UE0401 can be considered as in the radius that eNB 411 arrives imaginary label 420, and UE 401 timing information can not be forwarded to it is other
UE.However, if the P of UE0401 impressionseNBLess than first edge power threshold, then UE0401 is based on explaining in lower part
The condition released and timing information is forwarded to UE1402.If UE0401 detects condition (PeNB–PS0)>dth, then UE0401
D2DSSR will be forwarded to UE1402, and D2DSSR can be based solely on the timing information from eNB 411, or come from eNB 411
With the combination timing information of the D2DSS0 from S0, wherein dthIt is designated as second edge power threshold.dthIt is predetermined power level
Threshold value, and represent sequential forwarding capability activation threshold.Can network-based reliability requirement adjust number dth.In other words, such as
Fruit network has higher reliability requirement, then dthBy bigger.Meet condition PeNB<Pedge(PeNB–PS0)>dthMean
UE0401 comes from eNB by the annular section between the imaginary label 420 by Fig. 4 B and imaginary label 430 to use
411 timing information forwards D2DSSR.If (PeNB–PS0)<=dth, then UE0401 does not forward the sequential from eNB 411
Information, this is because the timing information can be considered as unreliable.
The cross-sectional view of Fig. 4 C definition graphs 4B.In the figure of top, imaginary label 440 is PeNB=PS0Place.With
UE0401 is moved into closer to eNB 411, PeNBIt will be greater than PS0.In intermediate pattern, eNB 411 between label 430 at a distance from be
In PeNB>(PS0+dth) radius in.This means that when UE0401 is moved to imaginary label 440 from imaginary label 430, PSS/
Decaying is reached d by the power level of SSSth.In the bottom figure of Fig. 4 C, imaginary label 420 between imaginary label 430 at a distance from be
Meeting Pedge>PeNB>(PS0+dth) annular section in.This means that if UE0401 is in eNB 411 and imaginary label 430
In radius but except eNB 411 with the radius of imaginary label 420, then UE0401 can by the timing information of eNB 411 with
D2DSSR is forwarded to UE1402.
Fig. 5 illustrates second exemplary scene of the device to device synchronous method.For the second exemplary scene, UE0501 phases
Than close eNB 511 closer to S0512.Therefore, if UE0501 detects PeNB>=Pth1, then UE0501 comes from selection
The sequential of eNB 511, this is because will be considered as closer to S0512, eNB 511 close to eNB 511 although UE0501 is compared
With higher priority, wherein Pth1It is the first power threshold.UE0501 will then make its sequential and from eNB's 511
PSS/SSS is synchronized, but timing information can not be forwarded to other UE by UE 501.However, if UE0501 detects PeNB<Pth1And
PS0>=Pth2, then UE0501 will be synchronous with the timing information from S0512, wherein Pth2It is designated as the second power threshold.This meaning
Taste UE0501 and may be too far from eNB 511 and/or receive sufficient power from eNB 511, but UE0501 will be from
S0512 receives abundant power, so that UE0501 will be synchronous with S0512.
Perimeter for the coverage area for being located at S0512 as UE0, or in other words, the P detected by UE0501S0
Less than predetermined first edge power threshold PedgeWhen the case where, if that UE0501 detects (PS0–PeNB)>dth, then UE0
It will be by transmitting the sequential with D2DSS0 or the combination sequential with D2DSS0 and eNB or having been received with UE0501 all
The D2DSSR of the combination sequential of D2DSS, and starting the timing information from S0512 being forwarded to may be in eNB 511 and S0512
Coverage area nearby or except other UE.Sequential forwarding can be adjusted based on the reliability requirement of entire D2D communication systems
Activation threshold, that is, second edge power threshold dth。
Fig. 6 illustrates third demonstration scene of the device to device synchronous method.For this exemplary scene, when UE0601 is examined
Measure the P received respectively from eNB 611, S0612 and S1 (not shown)eNB、PS0And PS1Entirely below predetermined power threshold when,
That is PeNB<Pth1And (PS0,PS1)<Pth2, then UE0601 is considered as except the coverage area of eNB networks and S0612, wherein
Pth1It is the first power threshold and Pth2It is the second power threshold.In the case, UE0601 will not in aforementioned synchronization source
The timing information of any one synchronize.But D2DSSR will be transmitted to by UE0601 based on its intrinsic timing information
Other peer devices in the range of UE0601 or D2D UE.
Fig. 7 is D2D synchronizing signals (D2DSS) trigger flow figure that explanation can relate to aforementioned scene.Assuming that UE is from base station
PSS/SSS is received, and at least one D2DSS is received from external synchronization source.In step s 701, it is assumed that there is D2D abilities
At least one system informations for having been transmitted from base station of UE detect PSS/SSS, and also motor synchronizing sources the UE with D2D abilities
At least one system information of transmission detects most strong D2DSS.In step S702, UE will determine whether it detects PSS/
RSRP (the RSRP of SSSPSS/SSS) it is less than predetermined PSS/SSS threshold values (threshold valuePSS/SSS), wherein threshold valuePSS/SSSWith Pth1It defines identical.
If the RSRP of PSS/SSS is higher than predetermined PSS/SSS threshold values, the mentioned above first exemplary scene will be applicable in.If
The RSRP of PSS/SSS is less than predetermined PSS/SSS threshold values, then step S703 will be executed.In step S703, UE is connect decision
RSRP (the RSRP of the D2DSS of receiptsD2DSS) whether it is less than predetermined D2DSS threshold values (threshold valueD2DSS), wherein threshold valueD2DSSWith Pth2Definition
It is identical.If the RSRP of the D2DSS received is higher than predetermined D2DSS threshold values, the mentioned above second exemplary scene will
It is applicable in.If the RSRP of the D2DSS received is less than predetermined D2DSS threshold values, step S704 will be executed, and mentioned above
Third demonstration scene will be applicable in.In step S704, UE will transmit D2DSS based on the timing information intrinsic UE.
Fig. 8 is the flow chart for summarizing proposed device to device synchronous method from the angle of the UE with D2D abilities.
In step S801, UE will receive detected signal from receiver, and when UE from the signal detected by obtaining with first
First signal of sequence information and the second signal with the second timing information.In step S802, UE, which will be based on described first, to be believed
Number and the second signal the upper limit of the power constraint and the difference power between first signal and the second signal and determine turn
Send out the first timing information or second timing information described.In step S803, UE will be based on all detected signals
Whether decide whether to transmit the intrinsic third timing informations of UE less than power threshold.
In one of in an exemplary embodiment, the first timing information may include primary synchronization signals (PSS) and secondary same
Walk signal (SSS), and if the first signal be higher than the first power threshold, UE can be synchronized to the first timing information of the first signal,
And if the first signal is less than the first power threshold, asynchronous the first timing information to the first signal.
In one of in an exemplary embodiment, if second signal is less than first higher than the second power threshold and the first signal
Power threshold, then UE can be synchronized to second signal.
In one of in an exemplary embodiment, UE can only the first signal less than the first power threshold and second signal it is low
In the case of the second power threshold, third timing information is just transmitted.
In one of in an exemplary embodiment, if the first signal is less than first edge power threshold, UE can forward the
One timing information, and if the first signal be higher than first edge power threshold, UE do not forward the first timing information.
In one of in an exemplary embodiment, if second signal is less than first edge power threshold, UE can forward the
Two timing informations, and if second signal be higher than first edge power threshold, UE do not forward the second timing information.
In one of in an exemplary embodiment, if the first signal has second edge power threshold higher than second signal
Power, then UE can forward the first timing information, and if the first signal do not have higher than second signal second edge power threshold
Power, then UE do not forward the first timing information.
In one of in an exemplary embodiment, exceed in second edge power-threshold than the first signal if second signal has
The power of value, then UE can forward the second timing information, and if second signal do not have exceed in second edge work(than the first signal
The power of rate threshold value, then UE do not forward the second timing information.
In one of in an exemplary embodiment, the first and second edge powers threshold value mentioned above is adjustable.
Fig. 9 is according to expressing plasticity UE for functional block diagram.The UE of Fig. 9 is by corresponding to the UE of Fig. 8, so as to according to function
Block diagram executes proposed device to device synchronous method.UE contains at least (but not limited to) and is couple to D/A (D/A)/analog/digital
(A/D) processing circuit 901 of converter 902, conveyer 903, receiver 904 and one or more antenna elements 905.
Conveyer 903 will wirelessly transmit signal, and receiver 904 will wirelessly receive signal.Conveyer 903 and receiver 904 are also
The executable operation such as low noise amplification, impedance matching, mixing, up-conversion or down coversion, filtering, amplification.(D/A)/(A/D)
Converter 902 is configured to from be transformed into from the analog signal format of receiver 904 can be by 901 digital processing of processing circuit
Digital signals format.On the other hand, (D/A)/(A/D) converters 902 can receive signal from processing circuit 901 and by digital signal
The signal of format is transformed into analog signal format to be transmitted to conveyer 903.Processing circuit 901 is configured to processing digital signal
And execution is according to the program for the D2D synchronous method of the foregoing example embodiment of the disclosure proposed.Moreover, processing circuit
901 can optionally be couple to non-transitory storage media to store programming code, device configuration, codebook, buffered or permanent
Data etc..The function of processing circuit 901 can be compiled by using such as microprocessor, microcontroller, dsp chip, FPGA etc.
Cheng Danyuan is implemented.The function of processing circuit 901 can also be implemented with independent electronic or IC, and executed by processing circuit
Function may be implemented in the domain of hardware or software.
In the disclosure, the keyword or term of 3GPP classes are used only as example so that the concept of the invention according to the disclosure is presented；
However, the same concept presented in the disclosure can be applied to any other system, such as IEEE by those skilled in the art
802.11, IEEE 802.16, WiMAX etc..
In the disclosure, term " user equipment " (UE) can indicate various embodiments, (for example) may include (but it is unlimited
In) movement station, advanced movement station (advanced mobile station, AMS), server, client, desktop PC,
Laptop computer, network computer, work station, personal digital assistant (personal digital assistant, PDA),
Tablet personal computer (personal computer, PC), scanner, telephone device, pager, camera, TV, hand-held
Video game apparatus, music apparatus, wireless sensor etc..In some applications, UE can be such as bus, train,
The fixed computer device operated in the mobile environment such as aircraft, ship, automobile.
It should not be construed as to this for element, action or the instruction in the detailed description of the disclosed embodiment of present application
It is absolute key or necessary for open, unless explicitly described.Moreover, as used herein, word " one " can
Including more than one project.If being intended to mean that only one project, term " single " or similar language will be used.In addition, such as
It is used herein, term before the list of multiple projects and/or multiple project kinds " any one of " wish include
The project and/or project kind individually or combine other projects and/or other project kinds " any one of ", " in
Any combinations ", " in any number of " and/or " in multiple any combinations ".In addition, as used herein, term " collection
Close " wish to include any quantity project, including zero.In addition, as used herein, term " quantity " is wished comprising any
Quantity, including zero.
Those skilled in the art will understand that without departing from the scope or spirit of the present disclosure, can be public to institute
The structure for the embodiment opened carry out various modifications and changes.In view of the foregoing, it is desirable to the disclosure cover the disclosure modification and
Variation, as long as the modifications and variations are fallen into the range of the appended claims and its equivalent.
Claims (14)
1. a kind of device suitable for user equipment is to device synchronous method, which is characterized in that the method includes：
Detected signal is received from receiver；
The first signal with the first timing information and second with the second timing information is obtained from the detected signal
Signal, wherein first timing information includes primary synchronization signals and secondary synchronizing signal, second timing information includes
First device is to device synchronizing signal；
If being synchronized to first timing information of first signal, based on first signal and the second signal
The upper limit of the power constrains and the difference power between first signal and the second signal determines to forward first timing information,
The wherein described upper limit of the power constraint includes first edge power threshold；And
Whether decide whether less than power threshold to transmit the user equipment based on first signal and the second signal
Intrinsic third timing information, wherein being only less than second less than the first power threshold and the second signal in first signal
In the case of power threshold, the third timing information is just transmitted.
2. according to the method described in claim 1, it is characterized in that, further including：
If first signal is higher than first power threshold, it is synchronized to first sequential letter of first signal
Breath；And
If first signal is less than first power threshold, asynchronous first sequential to first signal is believed
Breath.
3. according to the method described in claim 2, it is characterized in that, further including：
If the second signal is higher than second power threshold and first signal is less than first power threshold, together
Walk the second signal；And
Based on the constraint of the upper limit of the power of first signal and the second signal and first signal and the second signal
Between difference power determine to forward second timing information.
4. according to the method described in claim 2, it is characterized in that, further including：
If first signal is less than the first edge power threshold and first signal is with higher than the second signal
The excessively power of second edge power threshold then forwards first timing information；And
If first signal does not have higher than the first edge power threshold or first signal than the second signal
Exceed in the power of the second edge power threshold, does not then forward first timing information.
5. according to the method described in claim 3, it is characterized in that, further including：
Second signal less than the first edge power threshold and the second signal have than first signal exceed in
The power of second edge power threshold then forwards second timing information；And
Do not have than first signal higher than the first edge power threshold or the second signal in the second signal
Exceed in the power of the second edge power threshold, does not then forward second timing information.
6. according to the method described in claim 4, it is characterized in that, the wherein described first edge power threshold and second side
Both edge power thresholds are adjustable.
7. according to the method described in claim 1, it is characterized in that, the third timing information includes that second device is same to device
Walk signal.
8. a kind of user equipment, which is characterized in that including：
Conveyer, for transmitting wireless signal；
Receiver, for receiving wireless signal；And
Processing circuit is couple at least one conveyer and at least one receiver and is configured for use in：
Detected signal is received from the receiver；
The first signal with the first timing information and second with the second timing information is obtained from the detected signal
Signal, wherein first timing information includes primary synchronization signals and secondary synchronizing signal, second timing information includes
First device is to device synchronizing signal；
If being synchronized to first timing information of first signal, the work(based on first signal and the second signal
The rate upper limit constrain and the difference power between first signal and the second signal and forward first timing information, wherein institute
It includes first edge power threshold to state upper limit of the power constraint；And
It is intrinsic less than power threshold the user equipment to be transmitted by the conveyer in response to all detected signals
Third timing information, wherein being only less than the second power-threshold less than the first power threshold and the second signal in first signal
In the case of value, the third timing information is just transmitted.
9. user equipment according to claim 8, which is characterized in that the processing circuit be further configured for：
If first signal is higher than first power threshold, it is synchronized to first sequential letter of first signal
Breath；And
If first signal is less than first power threshold, asynchronous first sequential to first signal is believed
Breath.
10. user equipment according to claim 9, which is characterized in that the wherein described processing circuit be further configured with
For：
If the second signal is higher than the second power threshold and first signal is less than first power threshold, it is synchronized to
The second signal；And
Based on the constraint of the upper limit of the power of first signal and the second signal and first signal and the second signal
Between difference power determine to forward second timing information.
11. user equipment according to claim 9, which is characterized in that the wherein described processing circuit be further configured with
For：
If first signal is less than the first edge power threshold and first signal is with higher than the second signal
The excessively power of second edge power threshold then forwards first timing information via the conveyer；And
If first signal does not have higher than the first edge power threshold or first signal than the second signal
Exceed in the power of the second edge power threshold, then forwards first timing information not via the conveyer.
12. user equipment according to claim 10, which is characterized in that the wherein described processing circuit be further configured with
For：
If the second signal is less than the first edge power threshold and the second signal is with higher than first signal
The excessively power of second edge power threshold then forwards second timing information via the conveyer；And
If the second signal does not have higher than the first edge power threshold or the second signal than first signal
Exceed in the power of the second edge power threshold, then forwards second timing information not via the conveyer.
13. user equipment according to claim 11, which is characterized in that the wherein described first edge power threshold and described
Both second edge power thresholds are adjustable.
14. user equipment according to claim 8, which is characterized in that the third timing information includes second device pair
Device synchronizing signal.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201461932263P | 2014-01-28 | 2014-01-28 | |
| US61/932,263 | 2014-01-28 | ||
| US14/572,783 | 2014-12-17 | ||
| US14/572,783 US9167544B2 (en) | 2014-01-28 | 2014-12-17 | Device to device synchronization method applicable to user equipment and user equipment using the same |
| TW104100255A TWI539852B (en) | 2014-01-28 | 2015-01-06 | Device to device synchronization method applicable to user equipment and user equipment using the same |
| TW104100255 | 2015-01-06 |
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| CN104812059A CN104812059A (en) | 2015-07-29 |
| CN104812059B true CN104812059B (en) | 2018-08-31 |
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| WO2017193355A1 (en) * | 2016-05-13 | 2017-11-16 | 华为技术有限公司 | Device-to-device (d2d) communication method and d2d terminal device |
| WO2018072148A1 (en) * | 2016-10-19 | 2018-04-26 | 海能达通信股份有限公司 | Synchronization source coordination method and device |
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