CN105025567A - Method of performing device-to-device communication between two user equipments - Google Patents
Method of performing device-to-device communication between two user equipments Download PDFInfo
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- CN105025567A CN105025567A CN201410453764.6A CN201410453764A CN105025567A CN 105025567 A CN105025567 A CN 105025567A CN 201410453764 A CN201410453764 A CN 201410453764A CN 105025567 A CN105025567 A CN 105025567A
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Abstract
The invention provides a method of performing device-to-device communication between two user equipments. In a wireless communication system, a plurality of resource groups and a plurality of synchronization signals may be used to perform device-to-device communication. First monitor time associated with sending data and second monitor time associated with receiving data is determined, and each resource group is linked to a corresponding synchronization signal, a corresponding first monitor time and a corresponding second monitor time. A user equipment is configured to select a specific synchronization signal from the plurality of synchronization signals and broadcast the specific synchronization signal for claiming the corresponding resource group only after determining that the specific synchronization signal is not being transmitted by other devices at the corresponding first monitor time and the corresponding second monitor time.
Description
Technical field
The present invention relates to a kind of method of carrying out device between two communicators device being communicated, particularly relate to a kind of method using carrier sense technology to communicate to device to carry out device between two communicators to monitor synchronizing signal.
Background technology
In a wireless communication system, two communicators communicate with the other side indirectly by a base station, or by device to the communication pattern of device (device-to-device, D2D) directly and the other side carry out transfer of data.Device can adopt two kinds of patterns to come Resources allocation (resource allocation) ﹕ network terminal dominant pattern or user side dominant pattern to device architecture.
Under network terminal dominant pattern, when two communicators in the coverage of base station (incoverage) and want to carry out device device is communicated time, required Resourse Distribute can be given these two communicators by base station.But, if base station is too busy or inadequate resource, may transmission delay be caused, reduce the data transmission efficiency carried out when device communicates to device.In addition, the area coverage of network terminal dominant pattern is limited, cannot be applied in when communicator situation of (out-off coverage) outside the coverage of base station.
Under user side dominant pattern, when two communicators want to carry out device device is communicated time, from resource pool (resource pool), selection specific resources can carry out transfer of data.When controlling without base station, communicator need according to Carrier Sense Multiple Access/conflict detecting (carrier sense multiple access/collision detection, or Carrier Sense Multiple Access/conflict avoidance (carrier sense multiple access/collisionavoidance CSMA/CD), etc. CSMA/CA) competition mechanism strives for resource, to avoid the situation that data collision (data collision) occurs when device communicates to device.At the device of prior art under device communication construction, carrier sense performed by communicator be by monitor whether network has other device to spread out of data to reduce probability of conflicting, for the cyclical transmission that device produces the application of device communication in voice, carrier sense is not efficient resource distribution mode.In addition, device causes a kind of concealed terminal point (hidden terminal) problem to device communication random (ad-hoc) characteristic under user side dominant pattern, also, namely when the first communication device each other not within the scope of transmission and secondary communication device are thought to transmit data to same third communication device simultaneously, will clash and cause interference.
Therefore, for the device carried out between two communicators in wireless communication system to device communication, be necessary the resource distribution mode proposing a kind of low transmission delay, high spectrum service efficiency and the high network coverage in fact.
Summary of the invention
In view of the problem of above-mentioned prior art, main purpose of the present invention is to provide a kind of method of carrying out device and communicating to device between two communicators, by providing the resource distribution mode of a kind of low transmission delay, high spectrum service efficiency and the high network coverage, to avoid, when carrying out the method that device communicates to device, data collision occurs.
For reaching above-mentioned object, the invention provides a kind of method of carrying out device between two communicators device being communicated, it comprises provides multiple resource group and multiplely determines to be relevant to step letter ﹔ one first monitoring period that sends data and a resource group in described multiple resource group is connected to a synchronizing signal in described multiple synchronizing signal by ﹔ between being relevant to when one second prison receiving data is controlled, between when described first monitoring period and described 2nd prison control ﹔ mono-communicator judged whether other device transmitting described with step letter ﹔ and when the judgement of described communicator there is no any device transmitting described synchronizing signal time, transmit described synchronizing signal to advocate the right to use of described resource group.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the embodiment of the present invention one wireless communication system.
Fig. 2 is the functional block diagram of the embodiment of the present invention one electronic installation.
Fig. 3 is a kind of method flow diagram carrying out device and communicate to device between two communicators in the embodiment of the present invention.
Fig. 4 carries out the schematic diagram that device communicates to device between two communicators in the embodiment of the present invention.
Wherein, description of reference numerals is as follows:
10 network terminal
20 electronic installations
100 wireless communication systems
200 processing unit
210 storage elements
214 program codes
220 communications interface units
300 ~ 390 steps
F0 ~ F6 carrier wave frequency range
T0 ~ T9 subframe
RB
1~ RB
3resource Block
SS
1~ SS
3synchronizing signal
UE1 ~ UE6 communicator
TX
1~ TX
3, TY
1~ TY
3time point
Embodiment
Fig. 1 is the schematic diagram of the embodiment of the present invention one wireless communication system 100.Wireless communication system 100 can be made up of a network terminal 10 and multiple communicator briefly.For wanting to carry out a transmission end communicator that device communicates to device and a receiving terminal communicator, the present invention can be assisted to initialize by network terminal 10 or transmission end communicator, such as peer discovery (peer discovery), Resourse Distribute, and/or connect.It should be noted that peer discovery or the mode connected do not limit category of the present invention.
In FIG, SS
1~ SS
3represent the synchronizing signal that in wireless communication system 100, a transmission end communicator uses when carrying out device and communicating to device with a receiving terminal communicator, and TX
1~ TX
3and TY
1represent the time point of transmission end communicator or receiving terminal communicator transmission synchronizing signal.In wireless communication system 100 of the present invention, each communicator carries out device and will be described in detail in specification subsequent content the mode of device communication.
In an embodiment of the present invention, network terminal 10 can be a universal mobile telecommunications system (universal mobile telecommunications system, UMTS) multiple base station (node-B is comprised, NB) a universal terrestrial access network (universal terrestrialradio access network, UTRAN).In an alternative embodiment of the invention, network terminal 10 can be a Long Term Evolution (long term evolution, LTE) system, an advanced Long Term Evolution (LTE-Advanced, LTE-A) the advanced version of system or advanced long evolving system comprises multiple evolved base station (evolved-NB, and/or an evolved universal terrestrial access network (evolved UTRAN, E-UTRAN) of relay station eNB).In an alternative embodiment of the invention, network terminal 10 can be the base station in the wireless communication system meeting the Institute of Electrical and Electronics Engineers (IEEE) (Institute ofElectrical and Electronics Engineers, IEEE) wireless communication standard.It should be noted that the kind of network terminal 10 does not limit category of the present invention.
In embodiments of the present invention, each communicator can be mobile phone, personal digital assistant (personal digital assistant, PDA), hand-hold type (handheld) computer, flat board (tablet) computer, mini desktop (nettop) computer, notes type (laptop) computer, or other possesses the portable electronic devices of device to device communication function.In other embodiments of the present invention, each communicator also can be desktop computer, Set Top Box, network terminal application apparatus, or other possesses the fixed electronic device of device to device communication function.For convenience of description, Fig. 1 only shows 6 communicator UE1 ~ UE6.It should be noted that kind and the quantity of communicator do not limit category of the present invention.
Fig. 2 is the functional block diagram of the embodiment of the present invention one electronic installation 20.Electronic installation 20 comprises processing unit 200, storage element 210 and a communications interface unit 220, can be used to the communicator UE1 ~ UE6 implementing wireless communication system 100.Processing unit 200 can be a microprocessor (microprocessor) or an ASIC(Application Specific Integrated Circuit) (application specific integrated circuit, ASIC).Storage element 210 internal memory one program code 214, processing unit 200 reads and executive program code 214 by storage element 210.In embodiments of the present invention, storage element 210 includes but not limited to subscriber identification module (subscriber identity module, SIM), read-only memory (read-onlymemory, ROM), flash memory (flash memory), random access memory (random-accessmemory, RAM), CD, tape, hard disk, or optical data storage device etc.Communications interface unit 220 can be a wireless transceiver, and it can carry out device to device communication to transmit or to receive data according to the result of processing unit 200.
Fig. 3 is a kind of method flow diagram carrying out device and communicate to device between two communicators in the embodiment of the present invention.Flow chart shown in Fig. 3 can be compiled into program code 214, and it comprises the following steps:
Step 300: multiple resource group and multiple synchronizing signal are provided, and determine to be relevant to ﹔ execution step 310 between multiple first listening period sending data and the multiple second monitoring Shi being relevant to reception data.
Step 310: each set of resources is not connected to a corresponding synchronizing signal, corresponding first listening period, and one corresponding second monitors Shi Jian ﹔ and performs step 320.
Step 320: transmission end communicator chooses a particular sync signal from multiple synchronizing signal, performs step 330.
Step 330: at the first corresponding listening period and the second listening period, transmission end communicator judges whether that other device is transmitting the Tong step Xin ﹔ be selected and if so, performing step 340 ﹔ if not, perform step 350.
Step 340: transmission end communicator is chosen other Tong being different from particular sync signal and walked Xin ﹔ execution step 330.
Step 350: the synchronizing signal that transmission end communicator is selected in the first corresponding listening period transmission is to advocate that the Shi Quan ﹔ of corresponding resource group performs step 360.
Step 360: transmission end communicator monitor multiple resource group with judge whether that the use of other device has advocated that if so, usufructuary corresponding Zi Yuan Zu ﹔ performs step 340 ﹔ if not, perform step 370.
Step 370: transmission end communicator uses has advocated that usufructuary resource group is carried out Chuan defeated Shuo Ju ﹔ and performed step 380.
Step 380: receiving terminal communicator judges that whether detecting at the first corresponding listening period Tong that transmission end communicator transmits walks Xin ﹔ and if so, perform step 390 ﹔ if not, performs step 380.
Step 390: receiving terminal communicator uses the resource group being relevant to received synchronizing signal to receive data, and transmits at the second corresponding listening period the synchronizing signal transmitted from transmission end communicator.
In step 300 and 310, when the transmission end communicator of wireless communication system 100 with receiving terminal communicator when carrying out device and communicating to device, can synchronizing signal SS be used
1~ SS
mcarry out synchronous two communicators, resource group R can be used
1~ R
mcarry out transmission/reception data, the time point TX that can monitor
1~ TX
mand TY
1~ TY
mwhether detecting has other device transmitting corresponding synchronizing signal SS
1~ SS
m.Wherein, M be greater than 1 positive integer.
Fig. 4 is the schematic diagram performing step 300 and 310 modes in the embodiment of the present invention.Wireless communication system 100 of the present invention can adopt OFDM (orthogonalfrequency division multiplexing, OFDM) technology, its bandwidth resources used can be considered by frequency and time-interleaved Resource Block (resource block, RB), each Resource Block is the minimum bandwidth resource units distributing to different communication device, and the same time uses only can to single communication device.In the embodiment shown in fig. 4, multiple successive frames (frame) that the transmission time can be divided into length identical by the present invention, and the multiple carrier wave frequency range F0 ~ F6 being divided into by transmission bandwidth width identical.Each frame all comprises 10 subframe T0 ~ T9, the time point TX of the monitoring in each frame
1~ TX
mand TY
1~ TY
mmay correspond to the time point in specific sub-frame, wherein TX to subframe T0 ~ T9
1≠ TY
1, TX
2≠ TY
2..., TX
m≠ TY
m.It should be noted that wireless communication system 100 adopt the framework of bandwidth resources not limit category of the present invention.
In the embodiment of M=3 shown in Fig. 4, wireless communication system 100 can use 3 resource group R altogether
1~ R
3, each resource group can comprise one or more Resource Block.Resource group R
1link to synchronizing signal SS
1, monitor time point TX
1with the time point TY monitored
1, it comprises 4 Resource Block RB
1, represent spendable carrier wave frequency range F2 ~ F5 in the subframe T2 of each frame respectively.Resource group R
2link to synchronizing signal SS
2, monitor time point TX
2with the time point TY monitored
2, it comprises 5 Resource Block RB
2, to represent in the subframe T0 of each frame spendable carrier wave frequency range F2 ~ F3 respectively and spendable carrier wave frequency range F1 ~ F3 in subframe T6.Resource group R
3link to synchronizing signal SS
3, monitor time point TX
3with the time point TY monitored
3, it comprises 7 Resource Block RB
3, to represent in the subframe T3 of each frame spendable carrier wave frequency range F5 ~ F6 respectively, spendable carrier wave frequency range F4 ~ F6 in subframe T6, and in subframe T8 spendable carrier wave frequency range F3 ~ F4.
Suppose the time point TX will monitored in step 300
1~ TX
3be set to and correspond to subframe T0, and the time point TY that will monitor
1~ TY
3be set to and correspond to subframe T5, now whether each communicator can go detecting to have other device to transmit synchronizing signal SS at the subframe T0 of each frame
1~ SS
3be relevant to transmission data, and detecting can be gone whether to have other device to transmit synchronizing signal SS at the subframe T5 of each frame
1~ SS
3.In an embodiment of the present invention, transmission end communicator can be relevant to and send the identical listening period of data and go detecting to be connected to all resource group R in each frame
1~ R
msynchronizing signal SS
1~ SS
m(be also TX
1=TX
2=...=TX
m), and the identical listening period that can be relevant to reception data in each frame goes detecting to be connected to all resource group R
1~ R
msynchronizing signal SS
1~ SS
m(be also TY
1=TY
2=...=TY
m).In other embodiments of the present invention, transmission end communicator can be relevant to and send the different listening periods of data and go detecting to be connected to all resource group R in each frame
1~ R
msynchronizing signal SS
1~ SS
m(be also TX
1~ TX
mcan have a specific sequencing), and the different listening periods receiving data can be relevant to go detecting to be connected to all resource group R in each frame
1~ R
msynchronizing signal SS
1~ SS
m(be also TY
1~ TY
ma specific sequencing can be had).It should be noted that and be connected to resource group R
1~ R
mthe time point TX of monitoring
1~ TX
mand TY
1~ TY
mits sequencing does not limit category of the present invention.
In step 320, transmission end communicator can choose a particular sync signal.For example, transmission end communicator can from synchronizing signal SS
1~ SS
min choose a m synchronizing signal SS
m.Wherein, m is positive integer, and 1≤m≤M.
In a step 330, transmission end communicator can judge whether that other device is transmitting the synchronizing signal be selected.More particularly, communicator can at the time point TX of the monitoring of each frame
1~ TX
mand TY
1~ TY
mdetect respectively and whether have other device to transmit synchronizing signal SS
1~ SS
min the m synchronizing signal SS that is selected
m.
If the time point TX of the monitoring of transmission end communicator in one first frame
mand TY
mall do not detect other device and transmit m synchronizing signal SS
m, now can judge in a step 330 using m resource group R without any device
msend data or receive data, then can perform step 350 to transmit the synchronizing signal that is selected to advocate the right to use of corresponding resource group.For example, transmission end communicator can the time point TX of monitoring in the second subframe of then the first subframe
mtransmit m synchronizing signal SS
m, and then occupied m resource group R to the declaration of other communicator
mthe right to use.
On the other hand, if transmission end communicator detects the time point TX of the monitoring of other device in one first frame
mor TY
mtransmit m synchronizing signal SS
m, now can judge that other device existing is using m resource group R in a step 330
msend data or receive data, then can perform step 340 to choose other synchronizing signal being different from particular sync signal, such as, m value is updated to other arbitrary integer in 1 ~ M except m, then again performing step 330.Until after judging to transmit without any device the synchronizing signal be selected, the synchronizing signal that is selected just can be transmitted in step 350 to advocate the right to use of corresponding resource group.
If two transmission end communicators perform step 320 and 330 with the time, may obtain together being selected synchronizing signal not by the judged result used, and then all in step, advocate the right to use of same resource group in 350 simultaneously.If these two transmission end user's sets then all transmit data by same resource group, data collision will be caused.Therefore, in step 350, m synchronizing signal SS is transmitted at transmission end communicator
mto advocate m resource group R
mthe right to use after, separately can monitor resource group R in step 360
1~ R
mto have judged whether that other device is using m resource group R
m.If find that there is other device in step 360 using m resource group R
mtime, transmission end communicator can be abandoned previously having advocated usufructuary resource group R
m, and perform step 340 and 330 to choose/to judge other synchronizing signal.Only have and reaffirm in step 360 and using m resource group R without any device
mtime, transmission end communicator just can perform step 370 to use m resource group R
mtransmit data.
In step 380, receiving terminal communicator can judge whether to detect the synchronizing signal that transmission end communicator transmits, such as, judge whether the time point TX of the monitoring in one the 3rd frame
mdetect m synchronizing signal SS
m.3rd frame is the arbitrary frame after the second frame, and also namely receiving terminal communicator can continue the listening period detecting synchronizing signal in each frame.If can the time point TX of monitoring in the 3rd subframe
mdetect m synchronizing signal, receiving terminal communicator then can use m resource group to receive data in step 390, and the time point TY of monitoring in the 4th subframe of then the 3rd subframe
mtransmit m synchronizing signal SS
m, and then inform that other communicator is using m resource group R
mreceive data.
Please also refer to Fig. 1 and Fig. 3.If communicator UE1 successfully uses resource group R behind execution step 320 ~ 370
1to send data to communicator UE2, communicator UE1 carry out device to device communication during can continue the time point TX in each frame
1transmit the 1st synchronizing signal SS
1to adjacent communication device UE2 and UE5.As the time point TX of the monitoring of communicator UE2 in present frame
1detect the 1st synchronizing signal SS
1time, resource group R can be used
1carry out the data that received communication device UE1 transmits, and carry out device to device communication during continue the time point TY in each frame
1transmit the 1st synchronizing signal SS
1to adjacent communication device UE1 and UE3.If communicator UE3 wants to carry out device to device communication to send data to communicator UE4, but the time point TY of monitoring in present frame
1detect the 1st synchronizing signal SS
1time, can learn that other communicator is using resource group R
1receive data, therefore communicator UE3 (behind execution step 320 ~ 370) can use resource group R
2send data to communicator UE4, and carry out device to device communication during continue the time point TX in each frame
2transmit the 2nd synchronizing signal SS
2to adjacent communication device UE2 and UE4.If communicator UE5 wants to carry out device to device communication to send data to communicator UE6, but the time point TX of monitoring in present frame
1detect the 1st synchronizing signal SS
1time, can learn that other communicator is using resource group R
1send data, therefore communicator UE5 (behind execution step 320 ~ 370) can use resource group R
3send data to communicator UE6, and carry out device to device communication during continue the time point TX in each frame
3transmit the 3rd synchronizing signal SS
3to adjacent communication device UE1 and UE6.
The present invention uses carrier sense technology to monitor synchronizing signal, the resource group making each communicator can judge to can be used to carry out device to communicate to device.During specific communication devices successfully advocates the right to use/use specific resources group, can continue to send corresponding synchronizing signal occupied to inform other communicator specific resources group, and then avoid data collision occurs.In addition, communicator of the present invention can use specific resources group a period of time, until task just stops after completing sending corresponding synchronizing signal to disengage specific resources group, therefore do not need to perform Carrier Sense Multiple Access/competition mechanism such as conflict detecting or Carrier Sense Multiple Access/conflict avoidance continually to strive for resource group.On the other hand, during specific communication devices uses specific resources group to receive data, separately can continue to send corresponding synchronizing signal to inform other communicator, and then avoid the problem of concealed terminal point.Therefore, for the device carried out between two communicators in wireless communication system to device communication, the present invention can provide the resource distribution mode of a kind of low transmission delay, high spectrum service efficiency and the high network coverage.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. between two communicators, carry out the method that device communicates to device, it is characterized in that, ﹕ drawn together by bag
Multiple resource group and multiple Tong is provided to walk Xin ﹔
﹔ between when determining to be relevant to one first monitoring period sending data and one the 2nd prison control being relevant to reception data
﹔ between a first resource group in described multiple resource group being connected to when one first synchronizing signal in described multiple synchronizing signal, described first monitoring period and described 2nd prison are controlled
One first communication device judged whether other device transmitting the described one with step letter ﹔ and
When described first communication device judges that there is no any device is transmitting described first synchronizing signal, transmit described first synchronizing signal to advocate the right to use of described first resource group.
2. the method for claim 1, Qi Te levies Yu ﹕
Described first communication device is that described first monitoring period and described second monitoring period have judged whether that other device is transmitting the described one with step letter ﹔ in one first frame
When to judge in described first frame described first monitoring period and described second monitoring period there is no any device transmitting described first synchronizing signal time, described first communication device be in one second frame described first monitoring period transmit described first synchronizing signal with advocate described first resource group Shi Quan ﹔ and
Described second frame is then described first frame.
3. the method for claim 1, is characterized in that, another Bao Kuo ﹕
After the right to use advocating described first resource group, described first communication device monitor described multiple resource group with judged whether other device using described first resource Zu ﹔ and
When judging that there is no any device is using described first resource group, described first communication device uses described first resource group to transmit data to secondary communication device.
4. method as claimed in claim 3, Qi Te levies Yu ﹕
Described first communication device is that described first monitoring period has judged whether that other device is transmitting the described one with step letter ﹔ in one first frame
After the right to use advocating described first resource group, described first communication device be monitor in one second frame described multiple resource group using described first resource Zu ﹔ having judged whether other device and
Described second frame is after described first frame.
5. method as claimed in claim 3, is characterized in that, another Bao Kuo ﹕
Described first communication device use described first resource group to transmit data to described secondary communication device one during in, described first communication device within described period in all frames described first monitoring period transmit described first synchronizing signal.
6. method as claimed in claim 3, its another Bao Kuo ﹕
When described secondary communication device described first monitoring period in one first frame detects after described first communication device transmits described first synchronizing signal, use described first resource group to the Shuo Ju ﹔ receiving described first resource group and transmit and
Described secondary communication device use described first resource group to receive data one during in, described secondary communication device within described period in all frames described second monitoring period transmit described first synchronizing signal.
7. method as claimed in claim 3, is characterized in that, another Bao Kuo ﹕
Before the described first resource group of use transmits data to described secondary communication device, described first communication device uses described first synchronizing signal and described secondary communication device carries out synchronously.
8. the method for claim 1, is characterized in that, described first communication device is that described first monitoring period and described second monitoring period have judged whether that other device is transmitting described first synchronizing signal in one first frame, described method another Bao Kuo ﹕
Determine to be relevant to ﹔ between one the 3rd monitoring period sending data and one the 4th Jian control Shi being relevant to reception data
A Secondary resource group in described multiple resource group is connected to one second synchronizing signal in described multiple synchronizing signal, described 3rd monitoring period and described 4th Jian to control between Shi ﹔ and
When in described first frame, described first monitoring period or described second monitoring period judge have other device transmitting described first synchronizing signal to described first communication device, in one second frame of then described first frame, described 3rd monitoring period and described 4th monitoring period have judged whether that other device is transmitting described second synchronizing signal.
9. the method for claim 1, is characterized in that, described first resource group comprises the OFDM framework next one or a multiple Resource Block.
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|---|---|---|---|
| US201461980586P | 2014-04-17 | 2014-04-17 | |
| US61/980,586 | 2014-04-17 |
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| Publication number | Publication date |
|---|---|
| CN105025567B (en) | 2018-07-20 |
| TW201542024A (en) | 2015-11-01 |
| TWI549557B (en) | 2016-09-11 |
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