CN105898869B - Transmission method and device in a kind of D2D communication - Google Patents
Transmission method and device in a kind of D2D communication Download PDFInfo
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Abstract
The invention proposes the transmission methods and device in a kind of D2D communication.This problem of bursty interference is not adapted in unlicensed spectrum for the distribution mechanism of traditional D2D resource, base station passes through the transmission of D2D signal of the physical layer signaling dynamic termination UE in the given resource in the allocated D2D resource pool, avoids the interference in the given resource.The present invention has been compatible with the meeting conclusion about D2D communication, has good compatibility.
Description
Technical field
The present invention relates to the scheme dispatched in D2D (Device to Device, device is to device) communication, more particularly to
Resource scheduling scheme based on LTE (Long Term Evolution, long term evolution) D2D.
Background technique
Traditional 3GPP (3rd Generation Partner Project, third generation cooperative partner program) LTE system
In, data transmission occurs between base station and UE (User Equipment, user equipment).In 3GPP R12, D2D communicates quilt
It sets up the project and is discussed, the essential characteristic of D2D is that the data between UE is allowed to transmit.For FDD (Frequency Division
Duplex, frequency division duplex) and TDD (Time Division Duplex, time division duplex) system for, 3GPP is in RAN1 (Radio
Access Network Working Group1, the first working group of wireless access network) conclusion reached in #73 meeting is:
UE in D2D system does not allow to receive and dispatch simultaneously.Further, in order to avoid the interference that downlink data communicates D2D, UE, which is occupied, to be passed
Ascending resource, that is, FDD upstream band of system or the sub-frame of uplink of TDD are used for D2D communication, and (TDD downlink subframe needs further
It discusses).In RAN1#76bis meeting, pass through as drawn a conclusion:
For the UE in MPS process, base station utilizes PDCCH (Physical Downlink Control Channel)
Or EPDCCH (Enhanced PDCCH, the PDCCH of enhancing) sends UE distribution for sending SA (Scheduling to D2D
Assignment, scheduling configuration) and physical layer data resource.
Base station is configured to receive or be sent by SIB (System Information Block, system information block)
The candidate resource pond of SA.
Base station is explicit or implicitly configures one or more RPT (Resource Patterns for
Transmission sends resource map), a RPT is mapped to multiple D2D resource blocks for transmitting data in physical layer.RPT by
SA explicit or implicit instruction.
In traditional 3GPP LTE system, data transmission be can only occur on authorization frequency spectrum, however as the urgency of portfolio
Increase severely big, especially in some urban areas, frequency spectrum is authorized to be likely difficult to meet the needs of portfolio.62 plenary sessions of 3GPP RAN
A new research topic, the i.e. research (RP-132085) of unlicensed spectrum are discussed, main purpose is that research and utilization is awarded non-
Dependent (Non-standalone) deployment of the LTE on frequency spectrum is weighed, so-called dependent refers to the communication in unlicensed spectrum
Want and authorize the serving cell on frequency spectrum associated.One intuitive method is the CA reused in existing system as far as possible
The concept of (Carrier Aggregation, carrier wave polymerization), that is, be deployed in the serving cell on authorization frequency spectrum as Pcell
(Primary Cell, main plot), be deployed in serving cell in unlicensed spectrum as Scell (Secondary Cell, it is auxiliary
Cell).The CA includes traditional TDD CA, FDD (Frequency Division Duplex, frequency division duplex) CA, and
The FDD-TDD CA that 3GPP R12 is introduced.For unlicensed spectrum, it is contemplated that uncontrollable/prediction of its interference level, UE can
It can be configured more carrier waves while use the side of DFS (Dynamical Frequency Selection, dynamic spectrum selection)
Formula (giving stator frame) selects partial carrier wave from optional carrier wave and is used for transmission data.
Inventors discovered through research that a problem to be solved is when D2D communication occurs in unlicensed spectrum
It is incompatible between the configuration and DFS technology of D2D resource block.In 3GPP R12, base station is using RPT configuration D2D resource block to subtract
The signaling overheads of few D2D resource distribution, over multiple subframes, and part of subframe may be by for the D2D resource block distribution
Bursty interference and be not suitable for D2D signal transmission.
In view of the above-mentioned problems, the invention discloses transmission methods and device in a kind of D2D communication.It should be noted that
Although original intention is for the D2D communication in unlicensed spectrum, the solution of the present invention is equally applicable to the D2D communication of authorization frequency spectrum,
Such as eIMTA (enhanced Interference Management Traffic Adaptation, the interference management of enhancing
Service adaptation) in scene.
Summary of the invention
The invention discloses a kind of methods in UE, which comprises the steps of:
Step A. receives the first down physical layer signaling, and the first down physical layer signaling indicates D2D resource pool, the first downlink
Physical layer signaling transmits on the carrier wave for being deployed in authorization frequency spectrum
Step B. receives the second down physical layer signaling, and the second down physical layer signaling indicates given resource, described given
Resource belongs to the D2D resource pool
Step C. sends D2D signal in selected resource, and the selected resource belongs to the D2D resource pool, described selected
Resource and the given resource are orthogonal
Wherein, the number of sub frames that the D2D resource pool includes in the time domain is greater than 1.
It is orthogonal refer to be distributed in different subframes or different carrier waves.The down physical layer signaling is by base station equipment
It sends.
As one embodiment, the D2D resource pool is by the corresponding multiple D2D subframes of a RPT.Implement as one
Example, the selected resource is all resources removed except the given resource in the D2D resource pool.
Specifically, according to an aspect of the present invention, which is characterized in that the step C further includes following steps:
Step C0. sends D2D physical layer signaling and indicates the D2D resource pool or the selected resource.
As one embodiment, the D2D physical layer signaling is SA, the D2D physical layer signaling it is explicit or it is implicit
Instruction RPT, the RPT be mapped to the D2D resource pool.According to the present embodiment, the reception UE of the D2D signal is voluntarily detected
It whether there is D2D signal in the resource in each subframe in the D2D resource pool.
As another embodiment, the D2D physical layer signaling includes that K sub- signalings are dispatched respectively in the selected resource
K subframe, select a subframe in resource described in each sub- signaling scheduling, the K be the selected resource when
Number of sub frames on domain, the K are positive integers, and the K sub- signalings are sent in different subframes.According to the present embodiment, the D2D
The reception UE of signal determined according to the D2D physical layer signaling in the resource in each subframe in the D2D resource pool whether
There are D2D signals.
Specifically, according to an aspect of the present invention, which is characterized in that the given resource belong in the time domain one to
Stator frame.
As one embodiment, the given resource is the subframe for being used for transmission D2D signal.
Specifically, according to an aspect of the present invention, which is characterized in that the first down physical layer signaling is by the specific RNTI of UE
(Radio Network Temporary Identifier, the tentative mark of wireless network) mark, the second down physical layer signaling
By the specific RNTI mark of cell.
Physical layer signaling is by given RNTI mark means that: CRC (the Cyclic Redundancy of physical layer signaling
Check, cyclic redundancy are delivered for a check) by giving RNTI scrambling code.If physical layer signaling is located at USS, (UE Search Space, UE are searched
Rope space), physical layer signaling is also meant by given RNTI mark: transmission CCE (the Control Channel of physical layer signaling
Element, control channel unit) it is determined by given RNTI, it specifically describes with reference to the 9.1.1 section in TS36.213.
Specifically, according to an aspect of the present invention, which is characterized in that the second down physical layer signaling and the first downlink object
Reason layer signaling is transmitted on the same carrier wave.
As one embodiment, the second down physical layer signaling and the first down physical layer signaling by the UE Pcell
It sends.
Specifically, according to an aspect of the present invention, which is characterized in that the transmission subframe position of the second down physical layer signaling
In k-th of subframe to before stator frame, the k is no less than 4 positive integer.
As one embodiment, the k is 4.
Specifically, according to an aspect of the present invention, which is characterized in that the D2D resource pool includes at least 1 on frequency domain
A resource being deployed on the carrier wave of unlicensed spectrum.
As one embodiment, the D2D resource pool includes multiple carrier waves for being deployed in unlicensed spectrum and 1 on frequency domain
A up-link carrier for being deployed in authorization frequency spectrum.
Specifically, according to an aspect of the present invention, which is characterized in that the UE keeps zero to send in the given resource
Power.The i.e. described UE does not send signal in the given resource.
The invention discloses a kind of methods in base station, which comprises the steps of:
Step A. sends the first down physical layer signaling, and the first down physical layer signaling indicates D2D resource pool, the first downlink
Physical layer signaling transmits on the carrier wave for being deployed in authorization frequency spectrum
Step B. sends the second down physical layer signaling, and the instruction of the second down physical layer signaling is cancelled to be sent out in given resource
D2D signal is sent, the given resource belongs to the D2D resource pool
Wherein, the number of sub frames that the D2D resource pool includes in the time domain is greater than 1.
Specifically, above-mentioned aspect according to the present invention, which is characterized in that further include following steps before the step B:
The reception power that step B0. detects carrier wave locating for the D2D resource pool determines the given resource.
As one embodiment, reception function that the base station detects in the target carrier belonging to the D2D resource pool
Rate is more than given threshold value, and the base station determines, and the transmission of D2D signal does not occur in the silence period window in the target carrier, described
Resource in D2D resource pool in the silence period window of the target carrier is the given resource.
As one embodiment, the D2D resource pool is a subset in the D2D resource set for the transmission of D2D signal,
The D2D resource set is configured by high-level signaling, and the first physical layer signaling indicates the D2D resource pool in the D2D resource
The index of concentration.
Specifically, according to an aspect of the present invention, which is characterized in that the given resource belong in the time domain one to
Stator frame.
As one embodiment, the given resource is a subframe.
Specifically, according to an aspect of the present invention, which is characterized in that the first down physical layer signaling is by the specific RNTI of UE
Mark, the second down physical layer signaling are identified by the specific RNTI of cell.
As one embodiment, (Common Search Space, common search are empty in CSS for the second down physical layer signaling
Between) on transmit.
Specifically, according to an aspect of the present invention, which is characterized in that the second down physical layer signaling and the first downlink object
Reason layer signaling is transmitted on the same carrier wave.
Specifically, according to an aspect of the present invention, which is characterized in that the transmission subframe position of the second down physical layer signaling
In k-th of subframe to before stator frame, the k is no less than 4 positive integer.
Specifically, according to an aspect of the present invention, which is characterized in that the D2D resource pool includes at least 1 on frequency domain
A resource being deployed on the carrier wave of unlicensed spectrum.
As one embodiment, the D2D resource pool includes multiple carrier waves for being deployed in unlicensed spectrum and 1 on frequency domain
A up-link carrier for being deployed in authorization frequency spectrum.
Specifically, according to an aspect of the present invention, which is characterized in that the UE keeps zero to send in the given resource
Power.
The invention discloses a kind of user equipmenies, which is characterized in that the equipment includes:
First module: for receiving the first down physical layer signaling, the first down physical layer signaling indicates D2D resource pool,
First down physical layer signaling is transmitted on the carrier wave for being deployed in authorization frequency spectrum
Second module: for receiving the second down physical layer signaling, the second down physical layer signaling indicates given resource, institute
It states given resource and belongs to the D2D resource pool
Third module: for sending D2D signal in selected resource, the selected resource belongs to the D2D resource pool, institute
It is orthogonal for stating selected resource and the given resource
Wherein, the number of sub frames that the D2D resource pool includes in the time domain is greater than 1.
As one embodiment, third module is also used to send D2D physical layer signaling and indicates the D2D resource pool or institute
State selected resource.
As one embodiment, above equipment is characterized in that, the D2D resource pool includes at least one portion on frequency domain
The resource being deployed on the carrier wave of unlicensed spectrum, the UE keep zero to send power in the given resource.
The invention discloses a kind of base station equipments, which is characterized in that the equipment includes:
First module: for sending the first down physical layer signaling, the first down physical layer signaling indicates D2D resource pool,
First down physical layer signaling is transmitted on the carrier wave for being deployed in authorization frequency spectrum
Second module: for sending the second down physical layer signaling, the instruction of the second down physical layer signaling is cancelled given
D2D signal is sent in resource, the given resource belongs to the D2D resource pool
Wherein, the number of sub frames that the D2D resource pool includes in the time domain is greater than 1.
As one embodiment, above equipment is characterized in that, the D2D resource pool includes at least one portion on frequency domain
The resource being deployed on the carrier wave of unlicensed spectrum.
As one embodiment, above equipment further include:
Third module: the reception power for detecting carrier wave locating for the D2D resource pool determines the given resource.
This problem of bursty interference is not adapted in unlicensed spectrum for the distribution mechanism of traditional D2D resource, this
Transmission method and device in a kind of D2D communication of disclosure of the invention, base station is being divided by physical layer signaling dynamic termination UE
The transmission for the D2D signal in the given resource in D2D resource pool matched, avoids the interference in the given resource.This hair
The bright meeting conclusion being compatible with about D2D communication, has good compatibility.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, of the invention other
Feature, objects and advantages will become more apparent:
Fig. 1 shows the flow chart of D2D scheduling of resource according to an embodiment of the invention；
Fig. 2 shows D2D resource distribution schematic diagrames according to an embodiment of the invention；
Fig. 3 shows the processing unit structural block diagram in UE according to an embodiment of the invention；
Fig. 4 shows the processing unit structural block diagram in base station according to an embodiment of the invention；
Specific embodiment
Technical solution of the present invention is described in further detail below in conjunction with attached drawing, it should be noted that do not rushing
In the case where prominent, the feature in embodiments herein and embodiment can be arbitrarily combined with each other.
Embodiment 1
Embodiment 1 illustrates the flow chart of D2D scheduling of resource, as shown in Fig. 1.In attached drawing 1, base station N1 is UE U2
Serving BS, UE U2 are that D2D sends UE, and it includes UE U3 that corresponding D2D, which receives UE,.
ForBase station N1, the first down physical layer signaling, the instruction of the first down physical layer signaling are sent in step s 11
D2D resource pool, the first down physical layer signaling are transmitted on the carrier wave for being deployed in authorization frequency spectrum；Second is sent in step s 12
Down physical layer signaling, the instruction of the second down physical layer signaling, which is cancelled, sends D2D signal, the given resource in given resource
Belong to the D2D resource pool.
For UE U2, in the step s 21, receive the first down physical layer signaling, the instruction of the first down physical layer signaling
D2D resource pool, the first down physical layer signaling are transmitted on the carrier wave for being deployed in authorization frequency spectrum；In step S22, second is received
Down physical layer signaling, the second down physical layer signaling indicate that given resource, the given resource belong to the D2D resource pool；
In step S23, D2D signal is sent in selected resource, the selected resource belongs to the D2D resource pool, the selected money
Source and the given resource are orthogonal.
In embodiment 1, the number of sub frames that the D2D resource pool includes in the time domain is greater than 1, UE U2 in the given resource
Zero is kept to send power.
As the sub- embodiment 1 of embodiment 1, the first down physical layer signaling is identified by the specific RNTI of UE, the second downlink object
Layer signaling is managed to be identified by the specific RNTI of cell.
As the sub- embodiment 2 of embodiment 1, the transmission subframe of the second down physical layer signaling be located at it is described to stator frame it
K-th preceding of subframe, the k are no less than 4 positive integer.
As the sub- embodiment 3 of embodiment 1, for UE U2, the step S23, which is further comprised the steps of:, sends D2D physical layer
Signaling indicates the D2D resource pool or the selected resource.The D2D physical layer signaling is SA, the D2D physical layer signaling
Explicit or implicit instruction RPT, the RPT are mapped to the D2D resource pool.
Embodiment 2
Embodiment 2 illustrates D2D resource distribution schematic diagram, as shown in Fig. 2.In attached drawing 2, the lattice of oblique line mark is
The transmission subframe of first down physical layer signaling, the lattice of backslash mark are transmission of the second down physical layer signaling
Frame, the lattice of mark D1~D4 form the D2D resource pool for sending physical layer data, and the lattice of thick line mark is given
Resource.
For base station, the first down physical layer signaling is sent on a second carrier first, the first down physical layer signaling refers to
Show that the D2D resource pool-on first carrier is made of the subframe that D1~D4 is identified；Then the second down physical layer signaling is sent, the
The instruction of two down physical layer signalings, which is cancelled, sends D2D signal in given resource, and the given resource is identified by D3.
Corresponding UE receives the first down physical layer signaling, the instruction of the first down physical layer signaling on a second carrier first
D2D resource pool-on first carrier is made of the subframe that D1~D4 is identified；Then the second downlink physical is received on a second carrier
Layer signaling, the second down physical layer signaling indicate that given resource, the given resource are identified by D3；Then it is sent out on D1, D2, D4
Send D2D signal.
In embodiment 2, the second carrier wave is deployed in authorization frequency spectrum, and first carrier is deployed in unlicensed spectrum, the D2D resource
The number of sub frames that pond includes in the time domain is greater than 1.
As the sub- embodiment 1 of embodiment 2, the D2D resource pool is made of the corresponding multiple subframes of RPT.
As the sub- embodiment 2 of embodiment 2, the payload size of the first physical layer signaling is equal to the use transmitted on the second carrier wave
In the load of DCI (Downlink Control Information, Downlink Control Information) format 0/1A of scheduling first carrier
Size.
As the sub- embodiment 3 of embodiment 2, the reception power of carrier wave locating for the D2D resource pool is detected in the base station
Determine the given resource.
Embodiment 3
Embodiment 3 illustrates the processing unit structural block diagram in UE, as shown in Fig. 3.In attached drawing 3, UE processing unit 200
It is by receiving module 201, receiving module 202 and sending module 203 form.
Receiving module 201 indicates D2D resource for receiving the first down physical layer signaling, the first down physical layer signaling
Pond, the first down physical layer signaling are transmitted on the carrier wave for being deployed in authorization frequency spectrum；Receiving module 202 is for receiving the second downlink
Physical layer signaling, the second down physical layer signaling indicate that given resource, the given resource belong to the D2D resource pool；It sends
Module 203 is used to send D2D signal in selected resource, and the selected resource belongs to the D2D resource pool, the selected resource
It is orthogonal with the given resource.
In embodiment 3, the number of sub frames that the D2D resource pool includes in the time domain is greater than 1, and the D2D resource pool is in frequency domain
Upper includes that at least one is deployed in the resource on the carrier wave of unlicensed spectrum, and the UE keeps zero to send function in the given resource
Rate.
As the sub- embodiment 1 of embodiment 3, sending module 203 is also used to send D2D physical layer signaling and indicates the D2D
Resource pool or the selected resource.The transfer resource of the D2D physical layer signaling is by system configuration.
Embodiment 4
Embodiment 4 is the processing unit structural block diagram in base station, as shown in Fig. 4.In attached drawing 4, base station processing unit 300
It is by sending module 301, receiving module 302 and sending module 303 form, and wherein receiving module 302 is optional module.
Receiving module 301 indicates D2D resource for sending the first down physical layer signaling, the first down physical layer signaling
Pond, the first down physical layer signaling are transmitted on the carrier wave for being deployed in authorization frequency spectrum；Sending module 303 is for sending the second downlink
Physical layer signaling, the instruction of the second down physical layer signaling, which is cancelled, sends D2D signal in given resource, and the given resource belongs to
The D2D resource pool
In embodiment 4, the number of sub frames that the D2D resource pool includes in the time domain is greater than 1, and the D2D resource pool is in frequency domain
Upper includes that at least one is deployed in the resource on the carrier wave of unlicensed spectrum.
As the sub- embodiment 1 of embodiment 4, processing unit 300 further includes receiving module 302 for detecting the D2D money
The reception power of carrier wave locating for the pond of source determines the given resource.
Those of ordinary skill in the art will appreciate that all or part of the steps in the above method can be referred to by program
Related hardware is enabled to complete, described program can store in computer readable storage medium, such as read-only memory, hard disk or light
Disk etc..Optionally, one or more integrated circuit can be used also to realize in all or part of the steps of above-described embodiment.Phase
It answers, each modular unit in above-described embodiment, can be realized using example, in hardware, it can also be by the form of software function module
It realizes, the application is not limited to the combination of the software and hardware of any particular form.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification made, equivalent replacement, improve etc., it should be included in protection of the invention
Within the scope of.
Claims (13)
1. a kind of method in UE, which comprises the steps of:
Step A. receives the first down physical layer signaling, and the first down physical layer signaling indicates D2D resource pool, the first downlink physical
Layer signaling is transmitted on the carrier wave for being deployed in authorization frequency spectrum；
Step B. receives the second down physical layer signaling, and the second down physical layer signaling indicates given resource, the given resource
Belong to the D2D resource pool；
Step C. sends D2D signal in selected resource, and the selected resource belongs to the D2D resource pool, the selected resource
It is orthogonal with the given resource；
Wherein, the number of sub frames that the D2D resource pool includes in the time domain is greater than 1；First down physical layer signaling is specific by UE
RNTI mark, the second down physical layer signaling are identified by the specific RNTI of cell；The UE keeps zero to send in the given resource
Power.
2. the method according to claim 1, wherein the step C further includes following steps:
Step C0. sends D2D physical layer signaling and indicates the D2D resource pool or the selected resource.
3. the method according to claim 1, wherein the given resource belongs to one to stator in the time domain
Frame.
4. the method according to claim 1, wherein the second down physical layer signaling and the first down physical layer letter
What is enabled transmits on the same carrier wave.
5. the method according to claim 1, wherein the transmission subframe of the second down physical layer signaling is positioned at described
To k-th of subframe before stator frame, the k is no less than 4 positive integer.
6. method described in -5 any one according to claim 1, which is characterized in that the D2D resource pool includes on frequency domain
At least one is deployed in the resource on the carrier wave of unlicensed spectrum.
7. a kind of method in base station, which comprises the steps of:
Step A. sends the first down physical layer signaling, and the first down physical layer signaling indicates D2D resource pool, the first downlink physical
Layer signaling is transmitted on the carrier wave for being deployed in authorization frequency spectrum；
Step B. sends the second down physical layer signaling, and the instruction of the second down physical layer signaling is cancelled to be sent in given resource
D2D signal, the given resource belong to the D2D resource pool；
Wherein, the number of sub frames that the D2D resource pool includes in the time domain is greater than 1；First down physical layer signaling is specific by UE
RNTI mark, the second down physical layer signaling are identified by the specific RNTI of cell；The UE keeps zero to send in the given resource
Power.
8. the method according to the description of claim 7 is characterized in that further including following steps before the step B:
The reception power that step B0. detects carrier wave locating for the D2D resource pool determines the given resource.
9. the method according to the description of claim 7 is characterized in that the D2D resource pool includes that at least one is disposed on frequency domain
Resource on the carrier wave of unlicensed spectrum.
10. a kind of user equipment, which is characterized in that the equipment includes:
First module: for receive the first down physical layer signaling, the first down physical layer signaling indicate D2D resource pool, first
Down physical layer signaling is transmitted on the carrier wave for being deployed in authorization frequency spectrum；
Second module: for receiving the second down physical layer signaling, the second down physical layer signaling indicates given resource, described to give
Determine resource and belongs to the D2D resource pool；
Third module: for sending D2D signal in selected resource, the selected resource belongs to the D2D resource pool, the choosing
It is orthogonal for determining resource and the given resource；
Wherein, the first down physical layer signaling is identified by the specific RNTI of UE, and the second down physical layer signaling is by the specific RNTI of cell
Mark；The UE keeps zero to send power in the given resource.
11. equipment according to claim 10, which is characterized in that third module is also used to send D2D physical layer signaling and refers to
Show the D2D resource pool or the selected resource.
12. a kind of base station equipment, which is characterized in that the equipment includes:
First module: for send the first down physical layer signaling, the first down physical layer signaling indicate D2D resource pool, first
Down physical layer signaling is transmitted on the carrier wave for being deployed in authorization frequency spectrum；
Second module: for sending the second down physical layer signaling, the instruction of the second down physical layer signaling is cancelled in given resource
Upper transmission D2D signal, the given resource belong to the D2D resource pool；
Wherein, the first down physical layer signaling is identified by the specific RNTI of UE, and the second down physical layer signaling is by the specific RNTI of cell
Mark；The UE keeps zero to send power in the given resource.
13. equipment according to claim 12, which is characterized in that the equipment further include:
Third module: the reception power for detecting carrier wave locating for the D2D resource pool determines the given resource.
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| US10778387B2 (en) * | 2016-11-23 | 2020-09-15 | Huawei Technologies Co., Ltd. | System and method for group-assisted downlink transmission |
| CN113891483B (en) * | 2017-03-06 | 2024-04-16 | 上海朗帛通信技术有限公司 | User equipment used for dynamic scheduling, method and device in base station |
| CN109548130A (en) * | 2018-12-28 | 2019-03-29 | 浙江大学城市学院 | Distributed power-economizing method based on unlicensed band D2D system |
| CN112261729B (en) * | 2020-12-24 | 2021-03-19 | 北京建筑大学 | Self-adaptive semi-distributed resource allocation method based on D2D-U communication |
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| CN103179669A (en) * | 2013-04-22 | 2013-06-26 | 西安电子科技大学 | Resource distribution method for door 2 door (D2D) communication in long term evolution system |
| CN103338452A (en) * | 2013-06-04 | 2013-10-02 | 上海交通大学 | A D2D communication method under the auxiliary control of a base station in a cellular system |
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