CN105188020A - D2D communication method, user device and base station - Google Patents
D2D communication method, user device and base station Download PDFInfo
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- CN105188020A CN105188020A CN201510546855.9A CN201510546855A CN105188020A CN 105188020 A CN105188020 A CN 105188020A CN 201510546855 A CN201510546855 A CN 201510546855A CN 105188020 A CN105188020 A CN 105188020A
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Abstract
The invention discloses a D2D communication method, a user device and a base station, which are used for avoiding resource distribution conflict of a D2D distributed network. The D2D communication method comprises steps of, in the process of establishing D2Dmulti-jump connection, obtaining a time frequency domain resource for channel measurement by a UE, performing measurement on the channel where the time domain resource is positioned in order to determine whether the channel is free, if yes, performing pre-occupation on the channel by the UE, and establishing D2D connection when achieving a time point when the D2D connection is established. Through pre-occupation of the free channel by the UE, that the other UEs could occupy the channel can be prevented so as to avoid the resource distribution conflict under the scene of D2D multi-jump data transmission and prevent the interference between links.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of D2D communication means, subscriber equipment and base station.
Background technology
Device-to-device (DevicetoDevice, D2D) communication technology refers to subscriber equipment (UserEquipment, UE) by the frequency spectrum resource of multiplexing cellular cell between, directly communicate, and need not as conventional communication traffic, first by source terminal, signal is sent to base station, then be transmitted to object terminal by base station.Therefore, D2D communication more high efficiencyly can utilize frequency spectrum resource, improves Cellular Networks capacity.
The transmission of D2D multi-hop data is the distributed network based on D2D, relaying technique is introduced D2D communication system, makes a certain specific D2DUE in D2D distributed network possess multiple D2D and connect.Thus network capacity can be increased further, improve the availability of frequency spectrum, reduce system failure rate, improve systematic function and Consumer's Experience.
Current 3GPP agreement not yet considers the multi-hop data transmitting scene based on D2D, under this scene, is that base station assigns pattern or the resource distribution mode certainly selected all have its unavoidable drawback.
Based under the resource allocation mode of base station scheduling, base station is by the Resourse Distribute between UE a large amount of for management, because the particular location residing for UE cannot be grasped in base station, therefore, D2D cannot be carried out according to UE position and receive and dispatch the multiplexing of resource, once the multiple UE closed on are assigned to identical reception or send resource, then can cause the co-channel interference of the different link of distributed network.
Under the resource allocation mode selected, the selection due to resource places one's entire reliance upon the self-service selection of UE, therefore, selects the situation of identical transmitting-receiving resource more serious, thus causes disturbing between link.
Summary of the invention
Embodiments provide a kind of D2D communication means, subscriber equipment and base station, the resource allocation conflict problem of D2D distributed network can be avoided, prevent the interference between link.
First aspect, embodiments provides a kind of D2D communication means, comprising:
UE obtains the time-frequency domain resources of carrying out channel measurement, measure to determine that whether channel is idle to one of them channel at time-frequency domain resources place, if this channel idle, then UE takies this channel in advance, the channel taken in advance is busy channel, when arriving the time point setting up D2D connection, UE sets up D2D at this channel and connects.
In conjunction with first aspect, in the first possible implementation of first aspect, UE takies this channel in advance and comprises: UE sends pre-Seize ACK message on this channel, and pre-Seize ACK message comprises irregular power signal or regular significant signal.
In conjunction with the first possible implementation of first aspect or first aspect, in the implementation that the second of first aspect is possible, UE obtains and measures random quantity B and measure duration T; UE one of them channel to time-frequency domain resources place is measured to determine whether the free time comprises channel: UE determines the measurement initial time of UE in time-frequency domain resources according to measurement random quantity B and measurement duration T; UE, from measurement initial time, measures to determine that whether this channel is idle to channel in measurement duration T.
In conjunction with the implementation that the second of first aspect is possible, in the third possible implementation of first aspect, UE obtains measurement random quantity B and comprises: UE obtains the measurement random quantity B that base station sends; Or UE self determines to measure random quantity B; Or, UE from the pre-configured multiple random quantity B in base station Stochastic choice random quantity B as measurement random quantity B.
In conjunction with the implementation that the second of first aspect is possible, in the 4th kind of possible implementation of first aspect, according to measurement random quantity B and measurement duration T, UE determines that the measurement initial time of UE comprises: N1 chronomere after the time-domain resource starting point that time-frequency domain resources provides by UE is as the measurement initial time of UE, N1 measures random quantity B and the product measuring duration T, and the measurement initial time of UE is more than or equal to the measurement end time of a UE.
In conjunction with the implementation that the second of first aspect is possible, in the 5th kind of possible implementation of first aspect, according to measurement random quantity B and measurement duration T, UE determines that the measurement initial time of UE comprises: N2 chronomere after the time-domain resource starting point that time-frequency domain resources provides by UE is as the measurement initial time of UE, and N2 is for measuring random quantity B.
In conjunction with first aspect, in the 6th kind of possible implementation of first aspect, UE one of them channel to time-frequency domain resources place is measured to determine whether the free time comprises channel: UE calculates the power summation of the signal in unlike signal source on channel; If power summation is less than predetermined threshold value, then UE determines that channel is idle channel.
In conjunction with first aspect, in the 7th kind of possible implementation of first aspect, the channel of UE to time-frequency domain resources place is measured to determine whether the free time comprises this channel: when UE detects regular significant signal on this channel, UE determines that this channel is busy.
In conjunction with the 6th kind of possible implementation of first aspect or the 7th kind of possible implementation of first aspect, in the 8th kind of possible implementation of first aspect, UE carries out predetermined threshold value to this channel and measures for M time, if the result measured for M time is the free time, then UE confirms this channel idle, is measured as noncontinuity for M time and measures or continuity measurement.
In conjunction with first aspect or first aspect the first possible implementation, in the 9th kind of possible implementation of first aspect, if this channel is busy, then UE jumps to next channel and carries out measuring or again measure at channel after the time is dodged in the measurement preset.
Second aspect, the embodiment of the present invention is supplied to a kind of D2D communication means, comprising:
Base station sends D2D distributed network data transmission request to UE; Base station sends the time-frequency domain resources of carrying out channel measurement to UE, for making the channel of UE to time-frequency domain resources place measure, time-frequency domain resources determines that whether channel is idle, if idle, then and pre-busy channel, when arriving the time point setting up D2D connection, setting up D2D by channel and connecting.
In conjunction with second aspect, in the first possible implementation of second aspect, base station sends to UE and measures random quantity B and measure duration T, measure random quantity B and measure duration T and determine the measurement initial time in time-frequency domain resources for making UE, and from measurement initial time, measure to determine that whether this channel idle to channel in measurement duration T.
The third aspect, embodiments provides a kind of subscriber equipment, comprising:
First acquisition module, for obtaining the time-frequency domain resources of carrying out channel measurement; Measurement module, for measuring to determine that whether this channel is idle to one of them channel at time-frequency domain resources place; Processing module, for taking this channel in advance when determining this channel idle, the channel taken in advance is busy channel; Connection establishment module, for when arriving the time point setting up D2D connection, setting up D2D at this channel and connecting.
In conjunction with the third aspect, in the first possible implementation of the third aspect, processing module, specifically for sending pre-Seize ACK message on channel, pre-Seize ACK message comprises irregular power signal or regular significant signal.
In conjunction with the first possible implementation of the third aspect or the third aspect, in the implementation that the second of the third aspect is possible, subscriber equipment also comprises: the second acquisition module, measures random quantity B for obtaining and measures duration T; Measurement module comprises: the first determining unit, for determining the measurement initial time of UE in time-frequency domain resources according to measurement random quantity B and measurement duration T; Measuring unit, for from measurement initial time, measures to determine that whether channel is idle to channel in measurement duration T.
In conjunction with the implementation that the second of the third aspect is possible, in the third possible implementation of the third aspect, the second acquisition module specifically for: obtain base station send measurement random quantity B; Or, self determine to measure random quantity B; Or Stochastic choice random quantity B is as measurement random quantity B from multiple random quantity B that base station is pre-configured.
In conjunction with the implementation that the second of the third aspect is possible, in the 4th kind of possible implementation of the third aspect, first determining unit, specifically for the measurement initial time of N1 chronomere after time-domain resource starting point that time-frequency domain resources is provided as UE, N1 measures random quantity B and the product measuring duration T, and the measurement initial time of UE is more than or equal to the measurement end time of a UE.
In conjunction with the implementation that the second of the third aspect is possible, in the 5th kind of possible implementation of the third aspect, first determining unit, specifically for the measurement initial time of N2 chronomere after the time-domain resource starting point that time-frequency domain resources provided as UE, N2 is for measuring random quantity B.
In conjunction with the third aspect, in the 6th kind of possible implementation of the third aspect, measurement module also comprises: computing unit, for calculating the power summation of the signal in unlike signal source on channel; Second determining unit, for determining that when power summation is less than predetermined threshold value channel is idle channel.
In conjunction with the third aspect, in the 7th kind of possible implementation of the third aspect, measurement module, specifically for when regular significant signal being detected on channel, determines that channel is busy.
In conjunction with the 6th kind of possible implementation of the third aspect or the 7th kind of possible implementation of the third aspect, in the 8th kind of possible implementation of the third aspect, measurement module carries out predetermined threshold value to channel and measures for M time, if the result measured for M time is the free time, then UE acknowledgement channel is idle, is measured as noncontinuity for M time and measures or continuity measurement.
In conjunction with the third aspect or the 3rd the first possible implementation, in the 9th kind of possible implementation of the third aspect, measurement module, also for when channel is busy, jump to next channel and carry out measuring or again measuring at channel after the time is dodged in the measurement preset.
Fourth aspect, embodiments provides a kind of base station, comprising:
First sending module, for sending D2D distributed network data transmission request to UE; Second sending module, for sending the time-frequency domain resources of carrying out channel measurement to UE, for making the channel of UE to time-frequency domain resources place measure, time-frequency domain resources determines that whether channel is idle, if idle, then pre-busy channel, when arriving the time point setting up D2D connection, setting up D2D by channel and connecting.
In conjunction with fourth aspect, in the first possible implementation of fourth aspect, base station also comprises: the 3rd sending module, measure random quantity B for sending to UE and measure duration T, measure random quantity B and measure duration T and determine the measurement initial time in time-frequency domain resources for making UE, and from measurement initial time, measure to determine that whether channel idle to channel in measurement duration T.
As can be seen from the above technical solutions, the scheme of the embodiment of the present invention has following beneficial effect:
In the embodiment of the present invention, in the process setting up the connection of D2D multi-hop, UE first obtains the time-frequency domain resources of carrying out channel measurement, measure to determine that whether channel is idle to the channel at time-frequency domain resources place, if channel idle, the then pre-busy channel of UE, when arriving the time point setting up D2D connection, setting up D2D by this channel and connecting.UE, by taking idle channel in advance, to prevent other UE from taking this channel again, thus can avoid the resource allocation conflict under D2D multi-hop data transmitting scene, prevent the interference between link.
Term " first ", " second ", " the 3rd " " 4th " etc. (if existence) in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.The embodiments described herein should be appreciated that the data used like this can be exchanged in the appropriate case, so that can be implemented with the order except the content except here diagram or description.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
The transmission of D2D multi-hop data is the distributed network based on D2D, relaying technique is introduced D2D communication system, make a certain specific D2DUE in D2D distributed network possess multiple D2D to connect, as shown in Fig. 1 D2D distributed network schematic diagram, a D2DUE can support that multiple D2D connects.
Composition graphs 2, embodiments provides a kind of method that D2D communicates, comprising:
201, UE obtains the time-frequency domain resources of carrying out channel measurement;
When UE needs to set up the D2D connection based on distributed network, need to carry out channel measurement to find idle channel, when carrying out channel measurement, UE needs first to obtain the time-frequency domain resources of carrying out channel measurement.
This time-frequency domain resources can be sent to the time-frequency domain resources of UE by base station, also can be time-frequency domain that is pre-configured by the serving BS of the Serving cell at UE place or UE self-configuring, specifically not limit herein.
202, UE one of them channel to this time-frequency domain resources place is measured to determine that whether this channel is idle;
The time-frequency domain resources that UE obtains comprises time domain scale and frequency domain, this frequency domain is divided into multiple channel, and the channel of UE to this time-frequency domain resources place is measured, to find idle channel, during concrete measurement, be measure to determine that whether this channel is idle to one of them channel.
If 203 these channel idle, then UE takies this channel in advance;
After UE measures this channel, when determining that this channel is idle channel, if the time point that UE sets up D2D connection requires point at a fixed time, then UE first takies this channel in advance, takies this channel to prevent other UE.
204, when arriving the time point setting up D2D connection, UE sets up D2D at this channel and connects.
When reaching UE and setting up the time point of D2D connection, UE sets up D2D on this channel and connects.
In the embodiment of the present invention, in the process setting up the connection of D2D multi-hop, UE first obtains the time-frequency domain resources of carrying out channel measurement, measure to determine that whether channel is idle to the channel at time-frequency domain resources place, if channel idle, the then pre-busy channel of UE, when arriving the time point setting up D2D connection, setting up D2D by this channel and connecting.UE, by taking idle channel in advance, to prevent other UE from taking this channel again, thus can avoid the resource allocation conflict under D2D multi-hop data transmitting scene, prevent the interference between link.
Further, as another embodiment, in a kind of enforcement specifically, the mode of the pre-busy channel of UE can be send pre-Seize ACK message on channel.
The pre-Seize ACK message of channel can be the irregular power signal that place channel sends, and also can be with regular identification signal, regular identification signal can be secure the transmission cycle, sending duration, sends the signal specific of form.
When the pre-Seize ACK message of channel is irregular power signal, by modes such as power measurements, other UE, when this Channel Detection channel, can find that this channel is busy channel;
When the regular identification signal of the pre-Seize ACK message of channel, once other UE in the assigned position of this channel or/and frequency, the signal of specific format detected, then think that this channel is taken in advance by people.
In actual applications, have multiple UE in one piece of time-frequency domain resources, carry out the measurement of channel, occur to measure conflict in order to avoid between multiple UE, the embodiment of the present invention have employed Stochastic accessing Measuring Time mechanism simultaneously.
Composition graphs 3, embodiments provides a kind of D2D communication means, comprising:
301, UE obtains the time-frequency domain resources of carrying out channel measurement;
When UE needs to set up the D2D connection based on distributed network, need to carry out channel measurement to find idle channel, when carrying out channel measurement, UE needs first to obtain the time-frequency domain resources of carrying out channel measurement.
This time-frequency domain resources can be sent to the time-frequency domain resources of UE by base station, also can be time-frequency domain that is pre-configured by the serving BS of the Serving cell at UE place or UE self-configuring, specifically not limit herein.
This time-frequency domain resources of carrying out channel measurement comprises time domain scale and frequency domain, and therefore, UE is actual is obtain the time domain scale carrying out channel measurement and the frequency domain carrying out measuring.
Concrete, the frequency domain that UE carries out measuring can be by broadcast signaling or wireless heterogeneous networks (RadioResourceControl by base station, RCC) signaling directly sends to some subchannel of UE, also can be provided by base station to communicate certain large frequency domain as D2D, according to the needs of self, division be carried out to this frequency domain resource by UE and form multiple subchannel.
Concrete, the time domain scale that UE carries out measuring can be the special subframe of measurement sent by broadcast signaling or RCC signaling by base station, can also be that base station sends to UE configuration parameter, know that the quiet period being sent by certain normal data and receive carries out channel measurement by UE according to configuration parameter, the idle period that quiet period and normal data send, such as: multicast/multicast single-frequency network network (MultimediaBroadcastmulticastserviceSingleFrequencyNetwor k, MBSFN) subframe or time division duplex (TimeDivisionDuplexing, TDD) the protection interval (Guardperiod in special subframe, GP).
302, UE obtains and measures random quantity B and measure duration T;
When UE is when carrying out channel measurement, channel measurement is carried out at synchronization and the measurement conflict caused in order to avoid D2D distributed network node, UE obtains and measures random quantity B, be used for determining that UE is in the random amount initiating channel measurement, UE obtains and measures duration T simultaneously, and T is the test constantly time that UE carries out channel measurement.
It should be noted that, measure random quantity B and can send to UE by base station by dedicated signaling, also can be that UE self determines, can also be configured with a random quantity B pond by base station, UE is Stochastic choice random quantity B carrying out measuring as UE from this random quantity B pond.
Measuring duration T can be that base station sends to UE by broadcast signaling, also can be the fixing constant specified by agreement, can also be that UE self is pre-configured, specifically not limit herein.
It should be noted that, all issued by base station if measure random quantity B, measure duration T and measure time-frequency domain resources, can be then that parameter as channel measurement in a signaling issues, also can by different transmitting signaling downwards, concrete mode does not limit herein.
303, UE determines the measurement initial time of UE in this time-frequency domain resources according to measurement random quantity B and measurement duration T;
After UE obtains measurement random quantity B and measurement duration T, the measurement initial time of UE in this time-frequency domain resources is determined according to measurement random quantity B and measurement duration T, to make the measurement initial time of each UE in this time-frequency domain resources not identical, can stagger the time of carrying out measuring.
304, UE is from measurement initial time, measures to determine that whether this channel is idle in measurement duration T to one of them channel at this time-frequency domain place;
UE, after determining measurement initial time, from respective measurement initial time, measures to determine that whether this channel is idle to one of them channel at this time-frequency domain place in measurement duration T.
If 305 these channel idle, then UE takies this channel in advance;
After UE measures this channel, when determining that this channel is idle channel, then take this channel in advance.Specifically send pre-Seize ACK message on this channel, this pre-Seize ACK message can be the irregular power signal that place channel sends, and also can be with regular identification signal, regular identification signal can be secure the transmission cycle, sending duration, sends the signal specific of form.
306, when arriving the time point setting up D2D connection, UE sets up D2D at this channel and connects;
After UE takies this channel in advance, when reaching UE and setting up the time point of D2D connection, UE sets up D2D on this channel and connects.
If 307 channels are busy, then UE jumps to next channel and carries out measuring or again measure at this channel after the time is dodged in the measurement preset.
If when UE detects that channel is busy, the next subchannel that UE jumps to this time-frequency domain resources is measured, or again measures on this channel after the time is dodged in the measurement preset.
In the embodiment of the present invention, UE determines the measurement initial time on the channel at channel measurement time-frequency domain resources place by measuring random quantity B and measuring duration T, thus the measurement turn-on time of each UE that can stagger randomly, avoid multiple UE to initiate to measure the measurement conflict occurred simultaneously.
In the particular embodiment, according to measurement random quantity B and measurement duration T, UE determines that the concrete mode of the measurement initial time of UE in this time-frequency domain resources can comprise following two kinds:
One, using the product of B and T in described time-frequency domain resources corresponding time point as measurement initial time.
After the time-domain resource starting point that time-frequency domain resources provides by UE, N1 chronomere is as the measurement initial time of UE, N1 measures random quantity B and the product measuring duration T, the measurement initial time meeting other UE is the random multiple of T, the measurement time of initiating of different UEs staggers completely, make the measurement initial time of this UE be more than or equal to the measurement end time of a UE, the channel measurement time of different UEs can not be overlapping.
As shown in Figure 4, the frequency domain of channel measurement comprises 3 sub-channels: channel 1, channel 2, channel 3, suppose: the time-domain resource starting point of the time-frequency domain resources of channel measurement is t1, the Measuring Time of the B of UE1 to be the B of B1=0, UE2 be B2=1, UE1 and UE2 is all regular time T=1ms, then the measurement initial time of UE1 is t1+B1*T=t1, the measurement end time of measurement end time of UE1, to be the measurement initial time of t1+1ms, UE2 be t1+B2*T=t1+1ms, UE2 is t1+2ms.So UE1 and UE2 carry out time of measuring can not be overlapping.
As shown in Figure 4, after UE1 measures on channel 2, acknowledgement channel 2 is idle channel, the time point that UE sets up D2D connection if now also do not arrive, and such as UE must could initiate D2D and connect on the border of subframe, then now UE can not initiate D2D connection at once.Now UE2 initiates channel measurement, appoints and so thinks that channel 2 is idle channel, then also can initiate D2D at sub-frame boundary and connect, thus UE1 and UE2 still can be caused to use the conflict of same asset.
Therefore, in order to avoid above-mentioned conflict, measuring UE1 after discovery channel idle, need send pre-busy channel, prevents other UE busy channels.Then UE first takies this channel in advance, takies this channel to prevent other UE.If by launching the pre-busy channel of inactivity signal, then channel takies as shown in Figure 5 in advance, if launch regular identification signal, then channel takies as shown in Figure 6 in advance, and this regular identification signal is periodic characteristic signals.
Two, using measure random quantity B in described time-frequency domain resources corresponding time point as measurement initial time.
After the time-domain resource starting point that time-frequency domain resources provides by UE, N2 chronomere is as the measurement initial time of UE, N2 is for measuring random quantity B, this random quantity B is random number, therefore use the Measuring Time of this kind of mode different UEs not stagger completely, the channel measurement time of different UEs is likely overlapping.
As shown in Figure 5, the frequency domain of channel measurement comprises 3 sub-channels: channel 1, channel 2, channel 3, suppose: the time-domain resource starting point of the time-frequency domain resources of channel measurement is t1, the B of UE1 is B1=0, the B of UE2 is B2=0.5, the Measuring Time of UE1 and UE2 is all regular time T=1ms, then the measurement initial time of UE1 is t1+B1=t1, the measurement end time of UE1 is t1+1ms, the measurement initial time of UE2 is t1+B2=t1+0.5ms, the measurement end time of UE2 is t1+1.5ms, then at the end of UE1 does not also measure, UE2 has started to measure, so, the Measuring Time of UE1 and UE2 has overlap.
As shown in Figure 7, due to the Measuring Time of different UEs and failed call stagger completely, therefore, the channel measurement time of different UEs is likely overlapping, different UEs may be caused also to obtain the conflict of channel idle, therefore, in order to avoid above-mentioned conflict at the same channel of detection simultaneously, measure UE1 after discovery channel idle, pre-busy channel need be sent in next Measuring Time original position at once.
If by launching the pre-busy channel of inactivity signal, then channel takies as shown in Figure 8 in advance, if launch regular identification signal, then channel takies as shown in Figure 9 in advance, and this regular identification signal is periodic characteristic signals.
Further, as another embodiment, in concrete enforcement, UE measures channel, and whether idle method has following several:
One, judge with the signal power summation on channel;
UE calculates the power summation ∑ Rx of the signal in unlike signal source on this channel, if power summation is less than predetermined threshold value, then UE determines that channel is idle channel.Concrete, predetermined threshold value can be issued by measurement parameter by base station, also can configure in the preconfiguration parameters of UE.
Especially, if operating frequency, not when same frequency range, can be configured by base station or the spontaneous configuration measurementgap of UE, initiate different-frequency measure within the measurementgap time residing for above-mentioned detection channel and current UE.
Two, when regular significant signal being detected, confirm that this channel is busy channel.
When UE detects regular significant signal on this channel, represent that other UE occupies this channel in advance, then UE can determine that this channel is busy channel.
Further, in concrete enforcement, in order to avoid the interference that the channel idle busy channel of short time brings, within the preset time, UE takes multiple measurements this channel, the number of times measured is predetermined threshold value M, if the result measured for M time is when being the free time, UE just thinks and it should be noted that the free time that this channel is real, M measurement can be measured for noncontinuity, also can be successional measurement.
Be more than be introduced from UE side to the D2D communication the embodiment of the present invention, from base station side, the D2D communication the invention process be introduced below.
In conjunction with Figure 10, a kind of D2D communication means provided in the embodiment of the present invention, comprising:
1001, base station sends D2D distributed network data transmission request to UE;
UE sets up the connection of D2D multi-hop can by base station triggers, and when by base station triggers, base station sends the data transfer request of D2D distributed network to UE, thus triggering UE carries out channel measurement, sets up D2D multi-hop and connects.
1002, base station sends the time-frequency domain resources of carrying out channel measurement to UE.
Base station sends the time-frequency domain resources of carrying out channel measurement to UE, this time-frequency domain resources comprises time domain scale and frequency domain, this frequency domain is divided into multiple channel, UE measures to determine that whether channel is idle to one of them channel, if idle, then pre-busy channel, takies this channel to prevent other UE.When arriving the time point setting up D2D connection, UE sets up D2D at this channel and connects.
It should be noted that, base station sends data transfer request from D2D distributed network to UE can be send to UE together with same signaling with sending the time-frequency domain resources of carrying out channel measurement to UE, also can send to UE by different signalings, specifically not limit herein.
It should be noted that, the concrete mode of pre-busy channel sends pre-Seize ACK message on this channel, this pre-Seize ACK message can be the irregular power signal that place channel sends, also can be with regular identification signal, regular identification signal can be secure the transmission cycle, sending duration, sends the signal specific of form.
In the embodiment of the present invention, set up in the process of D2D multi-hop connection at UE, sent the data transfer request of D2D distributed network to UE by base station, carry out channel measurement to trigger UE, base station sends the time-frequency domain resources of carrying out channel measurement to UE, for making the channel of UE to this time-frequency domain resources place measure, this time-frequency domain resources determines that whether channel is idle, if idle, then pre-busy channel, when arriving the time point setting up D2D connection, setting up D2D by channel and connecting.The embodiment of the present invention, by taking idle channel in advance, to prevent other UE from taking this channel again, thus can be avoided the resource allocation conflict under D2D multi-hop data transmitting scene, prevent the interference between link.
Further, as another embodiment, the frequency domain that UE carries out measuring can be some subchannel directly being sent to UE by base station by broadcast signaling or RCC signaling, also can be provided by base station to communicate certain large frequency domain as D2D, according to the needs of self, division be carried out to this frequency domain resource by UE and form multiple subchannel.
The time domain scale that UE carries out measuring can be the special subframe of measurement sent by broadcast signaling or RCC signaling by base station, can also be that base station sends to UE configuration parameter, know that the quiet period sent by certain normal data carries out channel measurement by UE according to configuration parameter, the idle period of quiet period and regular traffic sending/receiving data, such as multicast/multicast single-frequency network network (MultimediaBroadcastmulticastserviceSingleFrequencyNetwor k, MBSFN) subframe or time division duplex (TimeDivisionDuplexing, TDD) the protection interval (Guardperiod in special subframe, GP).
Further, as another embodiment, channel measurement is carried out at synchronization and the measurement conflict caused in order to avoid D2D distributed network node, base station sends to UE and measures random quantity B and measure duration T, wherein, random quantity B is used for determining that UE is in the random amount initiating channel measurement, and measuring duration T is the test constantly time that UE carries out channel measurement.Measure random quantity B and measure duration T and determine the measurement initial time in time-frequency domain resources for making UE, and from measurement initial time, measure to determine that whether channel is idle to channel in measurement duration T.
It should be noted that, measure random quantity B and be configured with a random quantity B pond by base station, by UE Stochastic choice random quantity B carrying out measuring as UE from this random quantity B pond.
It should be noted that, measuring duration T can be that base station sends to UE by broadcast signaling, also can be the fixing constant specified by agreement.
It should be noted that, measurement random quantity B, measurement duration T and measurement time-frequency domain resources can be that the parameter as channel measurement in a signaling issues, also can by different transmitting signaling downwards, and concrete mode does not limit herein.
In the particular embodiment, according to measurement random quantity B and measurement duration T, UE determines that the concrete mode of the measurement initial time of UE in this time-frequency domain resources can comprise following two kinds:
One, using the product of B and T in described time-frequency domain resources corresponding time point as measurement initial time.Describe the associated description that please refer in Fig. 4, Fig. 5, Fig. 6 in detail, repeat no more herein.
Two, using measure random quantity B in described time-frequency domain resources corresponding time point as measurement initial time.Describe the associated description that please refer in Fig. 7, Fig. 8, Fig. 9 in detail, repeat no more herein.
In the embodiment of the present invention, UE is by measuring random quantity B and measuring the measurement initial time of duration T on the channel at channel measurement time-frequency domain resources place, thus the measurement turn-on time of each UE that can stagger randomly, thus multiple UE can be avoided to initiate to measure the measurement conflict occurred simultaneously.
Be more than the introduction that the D2D communication means in D2D distributed network is carried out, from functional module entity angle, the user equipment (UE) D2D communication and base station be introduced below.
In conjunction with Figure 11, a kind of subscriber equipment that the embodiment of the present invention provides, comprising:
First acquisition module 1101, for obtaining the time-frequency domain resources of carrying out channel measurement;
Measurement module 1102, for measuring to determine that whether this channel is idle to one of them channel at time-frequency domain resources place;
Processing module 1103, for when determining this channel idle, pre-busy channel, the channel taken in advance is busy channel;
Connection establishment module 1104, for when arriving the time point setting up D2D connection, setting up D2D at this channel and connecting.
Reciprocal process between each unit of embodiment of the present invention subscriber equipment 11 can consult aforementioned embodiment illustrated in fig. 2 in reciprocal process, specifically repeat no more herein.
In the embodiment of the present invention, set up in the process of D2D multi-hop connection at user equipment (UE), first acquisition module 1101 first obtains the time-frequency domain resources of carrying out channel measurement, the channel at measurement module 1102 pairs of time-frequency domain resources places is measured to determine that whether channel is idle, if channel idle, the then pre-busy channel of processing module 1103, when arriving the time point setting up D2D connection, connection establishment module 1104 is set up D2D by this channel and is connected.Because processing module 1103, by taking idle channel in advance, to prevent other UE from taking this channel again, thus can be avoided the resource allocation conflict under D2D multi-hop data transmitting scene, prevent the interference between link.
Further, as another embodiment, in a kind of enforcement specifically, processing module 1103, specifically for sending pre-Seize ACK message on channel, pre-Seize ACK message comprises irregular power signal or regular significant signal.
In conjunction with Figure 12, embodiments provide a kind of subscriber equipment 12, comprising:
First acquisition module 1201, for obtaining the time-frequency domain resources of carrying out channel measurement;
Measurement module 1202, for measuring to determine that whether this channel is idle to one of them channel at time-frequency domain resources place;
Processing module 1203, for when determining this channel idle, pre-busy channel, the channel taken in advance is busy channel;
Connection establishment module 1204, for when arriving the time point setting up D2D connection, setting up D2D at this channel and connecting.
Second acquisition module 1205, measures random quantity B for obtaining and measures duration T;
Wherein, measurement module 1202 comprises:
First determining unit 12021, for determining the measurement initial time of UE in time-frequency domain resources according to measurement random quantity B and measurement duration T;
Measuring unit 12022, for from measurement initial time, measures to determine that whether channel is idle to channel in measurement duration T.
Wherein, the second acquisition module 1205 specifically for:
Obtain the measurement random quantity B that base station sends;
Or, self determine to measure random quantity B;
Or Stochastic choice random quantity B is as measurement random quantity B from multiple random quantity B that base station is pre-configured.
Wherein, measurement module 1202, also for when channel is busy, jumps to next channel and carries out measuring or again measuring at channel after the time is dodged in the measurement preset.
Reciprocal process between each unit of embodiment of the present invention subscriber equipment 12 can consult aforementioned embodiment illustrated in fig. 3 in reciprocal process, specifically repeat no more herein.
In the embodiment of the present invention, measurement module 1202 determines the measurement initial time on the channel at channel measurement time-frequency domain resources place by measuring random quantity B and measuring duration T, thus the measurement turn-on time of each UE that can stagger randomly, avoid multiple UE to initiate to measure the measurement conflict occurred simultaneously.
Further, as another embodiment, in a kind of enforcement specifically, first determining unit 12021, specifically for the measurement initial time of N1 chronomere after time-domain resource starting point that time-frequency domain resources is provided as UE, N1 measures random quantity B and the product measuring duration T, and the measurement initial time of UE is more than or equal to the measurement end time of a UE.Or the first determining unit 12021, specifically for the measurement initial time of N2 chronomere after the time-domain resource starting point that time-frequency domain resources provided as UE, N2 is for measuring random quantity B.
Further, as another embodiment, in a kind of enforcement specifically, measurement module 1202 also comprises:
Computing unit, for calculating the power summation of the signal in unlike signal source on channel;
Second determining unit, for determining that when power summation is less than predetermined threshold value channel is idle channel.
Optionally, as another embodiment, in a kind of enforcement specifically, measurement module 1202, specifically for when regular significant signal being detected on channel, determines that channel is busy.
Further, as another embodiment, in a kind of enforcement specifically, measurement module 1202 pairs of channels carry out predetermined threshold value and measure for M time, if the result measured for M time is the free time, then UE acknowledgement channel is idle, are measured as noncontinuity for M time and measure or continuity measurement.
From modular functionality entity angle, the base station the embodiment of the present invention is described in detail below.
In conjunction with Figure 13, a kind of base station 13 provided in the embodiment of the present invention, comprising:
First sending module 1301, for sending the data transfer request of D2D distributed network to UE;
Second sending module 1302, for sending the time-frequency domain resources of carrying out channel measurement to UE, for making the channel of UE to time-frequency domain resources place measure, time-frequency domain resources determines that whether channel is idle, if idle, then pre-busy channel, when arriving the time point setting up D2D connection, setting up D2D by channel and connecting.
Reciprocal process between each unit of embodiment of the present invention base station 13 can consult aforementioned embodiment illustrated in fig. 10 in reciprocal process, specifically repeat no more herein.
In the embodiment of the present invention, set up in the process of D2D multi-hop connection at UE, first sending module 1301 sends the data transfer request of D2D distributed network to UE, channel measurement is carried out to trigger UE, second sending module 1302 sends the time-frequency domain resources of carrying out channel measurement to UE, for making the channel of UE to this time-frequency domain resources place measure, this time-frequency domain resources determines that whether channel is idle, if idle, then pre-busy channel, when arriving the time point setting up D2D connection, setting up D2D by channel and connecting.The embodiment of the present invention, by taking idle channel in advance, to prevent other UE from taking this channel again, thus can be avoided the resource allocation conflict under D2D multi-hop data transmitting scene, prevent the interference between link.
Further, as another embodiment, in a kind of enforcement specifically, this base station 13 also comprises:
3rd sending module, measure random quantity B for sending to UE and measure duration T, measure random quantity B and measure duration T and determine the measurement initial time in time-frequency domain resources for making UE, and from measurement initial time, measure to determine that whether channel is idle to channel in measurement duration T.
Those skilled in the art can be well understood to, and for convenience and simplicity of description, the system of foregoing description, the specific works process of device and unit, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
In several embodiments that the application provides, should be understood that, disclosed system, apparatus and method, can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disc or CD etc. various can be program code stored medium.
The above, above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Accompanying drawing explanation
Fig. 1 is D2D distributed network schematic diagram in the embodiment of the present invention;
Fig. 2 is a kind of flow chart of D2D communication means in the embodiment of the present invention;
Fig. 3 is the another kind of flow chart of D2D communication means in the embodiment of the present invention;
Fig. 4 is the channel measurement time of D2D communication in the embodiment of the present invention and a kind of schematic diagram at measurement interval;
Fig. 5 is a kind of schematic diagram of the pre-busy channel of D2D communication in the embodiment of the present invention;
Fig. 6 is the another kind of schematic diagram of the pre-busy channel of D2D communication in the embodiment of the present invention;
Fig. 7 is the channel measurement time of D2D communication in the embodiment of the present invention and the another kind of schematic diagram at measurement interval;
Fig. 8 is the another kind of schematic diagram of the pre-busy channel of D2D communication in the embodiment of the present invention;
Fig. 9 is the another kind of schematic diagram of the pre-busy channel of D2D communication in the embodiment of the present invention;
Figure 10 is a kind of flow chart of the D2D communication means of base station side in the embodiment of the present invention;
Figure 11 is the high-level schematic functional block diagram of subscriber equipment in the embodiment of the present invention;
Figure 12 is another high-level schematic functional block diagram of subscriber equipment in the embodiment of the present invention;
The high-level schematic functional block diagram of base station in Figure 13 embodiment of the present invention.
Embodiment
Embodiments provide a kind of D2D communication means, subscriber equipment and base station, the resource allocation conflict problem of D2D distributed network can be avoided, prevent the interference between link.Be described in detail respectively below.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
Claims (24)
1. a D2D communication means, is characterized in that, comprising:
UE obtains the time-frequency domain resources of carrying out channel measurement;
Described UE one of them channel to described time-frequency domain resources place is measured to determine that whether described channel is idle;
If described channel idle, then described UE takies described channel in advance, and the channel taken in advance is busy channel;
When arriving the time point setting up D2D connection, described UE sets up D2D at described channel and connects.
2. method according to claim 1, is characterized in that, described UE takies described channel in advance and comprises:
Described UE sends pre-Seize ACK message on that channel, and described pre-Seize ACK message comprises irregular power signal or regular significant signal.
3. method according to claim 1 and 2, is characterized in that, described method also comprises:
Described UE obtains and measures random quantity B and measure duration T;
Described UE one of them channel to described time-frequency domain resources place is measured to determine whether the free time comprises described channel:
Described UE determines the measurement initial time of described UE in described time-frequency domain resources according to described measurement random quantity B and measurement duration T;
Described UE, from described measurement initial time, measures to determine that whether described channel is idle to described channel in described measurement duration T.
4. method according to claim 3, is characterized in that, described UE obtains measurement random quantity B and comprises:
Described UE obtains the described measurement random quantity B that base station sends;
Or described UE self determines described measurement random quantity B;
Or, described UE from the pre-configured multiple random quantity B in base station Stochastic choice random quantity B as described measurement random quantity B.
5. method according to claim 3, is characterized in that:
According to described measurement random quantity B and measurement duration T, described UE determines that the measurement initial time of described UE comprises:
N1 chronomere after the time-domain resource starting point that described time-frequency domain resources provides by described UE is as the measurement initial time of described UE, described N1 is described measurement random quantity B and the product measuring duration T, and the measurement initial time of described UE is more than or equal to the measurement end time of a UE.
6. method according to claim 3, is characterized in that:
According to described measurement random quantity B and measurement duration T, described UE determines that the measurement initial time of described UE comprises:
N2 chronomere after the time-domain resource starting point that described time-frequency domain resources provides by described UE is as the measurement initial time of described UE, and described N2 is described measurement random quantity B.
7. method according to claim 1, is characterized in that, described UE one of them channel to described time-frequency domain resources place is measured to determine whether the free time comprises described channel:
Described UE calculates the power summation of the signal in unlike signal source on described channel;
If described power summation is less than predetermined threshold value, then described UE determines that described channel is idle channel.
8. method according to claim 1, is characterized in that, the channel of described UE to described time-frequency domain resources place is measured to determine whether the free time comprises described channel:
When described UE detects regular significant signal on that channel, described UE determines that described channel is busy.
9. the method according to claim 7 or 8, it is characterized in that, described UE carries out predetermined threshold value to described channel and measures for M time, if the described result measured for M time is the free time, then described UE confirms described channel idle, and the described noncontinuity that is measured as M time is measured or continuity measurement.
10. method according to claim 1 and 2, is characterized in that, described method also comprises:
If described channel is busy, then described UE jumps to next channel and carries out measuring or again measure at described channel after the time is dodged in the measurement preset.
11. 1 kinds of D2D communication meanss, is characterized in that, comprising:
Base station sends D2D distributed network data transmission request to UE;
Base station sends the time-frequency domain resources of carrying out channel measurement to UE, described time-frequency domain resources is measured to determine that whether described channel is idle for making the channel of described UE to described time-frequency domain resources place, if idle, then take described channel in advance, when arriving the time point setting up D2D connection, setting up D2D by described channel and connecting.
12. methods according to claim 11, is characterized in that, described method also comprises:
Described base station sends to described UE and measures random quantity B and measure duration T, described measurement random quantity B and measurement duration T determines the measurement initial time in described time-frequency domain resources for making described UE, and from described measurement initial time, measure to determine that whether described channel idle to described channel in described measurement duration T.
13. 1 kinds of subscriber equipmenies, is characterized in that, comprising:
First acquisition module, for obtaining the time-frequency domain resources of carrying out channel measurement;
Measurement module, for measuring to determine that whether described channel is idle to one of them channel at described time-frequency domain resources place;
Processing module, for taking described channel in advance when determining described channel idle, the channel taken in advance is busy channel;
Connection establishment module, for when arriving the time point setting up D2D connection, setting up D2D at described channel and connecting.
14. subscriber equipmenies according to claim 13, is characterized in that:
Described processing module, specifically for sending pre-Seize ACK message on that channel, described pre-Seize ACK message comprises irregular power signal or regular significant signal.
15. subscriber equipmenies according to claim 12 or 13, it is characterized in that, described subscriber equipment also comprises:
Second acquisition module, measures random quantity B for obtaining and measures duration T;
Described measurement module comprises:
First determining unit, for determining the measurement initial time of described UE in described time-frequency domain resources according to described measurement random quantity B and measurement duration T;
Measuring unit, for from described measurement initial time, measures to determine that whether described channel is idle to described channel in described measurement duration T.
16. subscriber equipmenies according to claim 15, is characterized in that, described second acquisition module specifically for:
Obtain the described measurement random quantity B that base station sends;
Or, self determine described measurement random quantity B;
Or Stochastic choice random quantity B is as described measurement random quantity B from multiple random quantity B that base station is pre-configured.
17. subscriber equipmenies according to claim 15, is characterized in that:
Described first determining unit, specifically for the measurement initial time of N1 chronomere after time-domain resource starting point that described time-frequency domain resources is provided as described UE, described N1 is described measurement random quantity B and the product measuring duration T, and the measurement initial time of described UE is more than or equal to the measurement end time of a UE.
18. subscriber equipmenies according to claim 15, is characterized in that:
Described first determining unit, specifically for the measurement initial time of N2 chronomere after the time-domain resource starting point that described time-frequency domain resources provided as described UE, described N2 is described measurement random quantity B.
19. subscriber equipmenies according to claim 13, is characterized in that, described measurement module also comprises:
Computing unit, for calculating the power summation of the signal in unlike signal source on described channel;
Second determining unit, for determining that when described power summation is less than predetermined threshold value described channel is idle channel.
20. subscriber equipmenies according to claim 13, is characterized in that:
Described measurement module, specifically for when regular significant signal being detected on that channel, determines that described channel is busy.
21. subscriber equipmenies according to claim 19 or 20, it is characterized in that, described measurement module carries out predetermined threshold value to described channel and measures for M time, if the described result measured for M time is the free time, then described UE confirms described channel idle, and the described noncontinuity that is measured as M time is measured or continuity measurement.
22. subscriber equipmenies according to claim 13 or 14, is characterized in that:
Described measurement module, also for when described channel is busy, jumps to next channel and carries out measuring or again measuring at described channel after the time is dodged in the measurement preset.
23. 1 kinds of base stations, is characterized in that, comprising:
First sending module, for sending D2D distributed network data transmission request to UE;
Second sending module, for sending the time-frequency domain resources of carrying out channel measurement to UE, described time-frequency domain resources is measured to determine that whether described channel is idle for making the channel of described UE to described time-frequency domain resources place, if idle, then take described channel in advance, when arriving the time point setting up D2D connection, setting up D2D by described channel and connecting.
24. base stations according to claim 23, is characterized in that, described base station also comprises:
3rd sending module, measure random quantity B for sending to described UE and measure duration T, described measurement random quantity B and measurement duration T determines the measurement initial time in described time-frequency domain resources for making described UE, and from described measurement initial time, measure to determine that whether described channel idle to described channel in described measurement duration T.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510546855.9A CN105188020B (en) | 2015-08-31 | 2015-08-31 | D2D communication means, user equipment and base station |
| PCT/CN2015/093522 WO2017035939A1 (en) | 2015-08-31 | 2015-10-31 | D2d communication method, user equipment, and base station |
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| CN201510546855.9A CN105188020B (en) | 2015-08-31 | 2015-08-31 | D2D communication means, user equipment and base station |
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Also Published As
| Publication number | Publication date |
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| WO2017035939A1 (en) | 2017-03-09 |
| CN105188020B (en) | 2019-01-11 |
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