CN105517160B - The method and apparatus of D2D Class1 discovery resource distribution are carried out in TDD system - Google Patents
The method and apparatus of D2D Class1 discovery resource distribution are carried out in TDD system Download PDFInfo
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- CN105517160B CN105517160B CN201410505201.7A CN201410505201A CN105517160B CN 105517160 B CN105517160 B CN 105517160B CN 201410505201 A CN201410505201 A CN 201410505201A CN 105517160 B CN105517160 B CN 105517160B
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Abstract
The present invention provides a kind of method and apparatus for carrying out the discovery resource distribution of D2D Class1 in a tdd system.This method comprises: TDD configuration mode used in determining；For identified TDD configuration mode, the HFLF of each UL subframe is determined, wherein the HFLF of UL subframe indicates the HARQ feedback how many DL subframe is carried in the UL subframe；Art is needed according to D2D business, the lower one or more UL subframes of HFLF is selected to find for Class1.
Description
Technical field
The present invention is generally related to the field equipment room direct communication (Device to Device, D2D), it is more specific and
Speech is related to the method and apparatus that the discovery resource distribution of D2D Class1 is carried out in time division duplex (TDD) system.
Background technique
In long term evolution (LTE) D2D system, D2D transmission be can be only fitted in LTE carrier wave, be passed with uplink (UL) honeycomb
Defeated shared ascending resource, such as UL carrier wave is shared in frequency division duplex (FDD) system, it is shared in time division duplex (TDD) system
UL subframe.In general, using time division multiplexing (TDM) between D2D transmission and cellular transmission.However, in order to support downlink (DL) honeycomb
Business transmission is configured for also needing to transmit to the DL cellular services in corresponding DL subframe in the UL subframe of D2D transmission
Hybrid automatic repeat-request (HARQ) feeds back (positive acknowledgment (ACK) or negative confirmation (NACK)), and the HARQ feedback and D2D are transmitted
The frequency division multiplexing in the UL subframe.System emulation shows that, in base station, D2D transmission may be for the HARQ with its frequency division multiplexing
The reception of feedback, which has, to be seriously affected.Therefore, D2D resource distribution is contemplated that possible influence received on HARQ feedback.
In FDD system, for the transmission of associated DL business, HARQ feedback timing is fairly simple and not with son
Frame and change.For example, the HARQ feedback of the business in n-th of (DL) subframe appears in n-th+4 according to LTE Release8 (R8)
In a (UL) subframe.Therefore, in FDD system, when D2D resource distribution, does not need the timing special consideration should be given to HARQ feedback.
However, for TDD system, HARQ feedback timing depends not only on DL-ULTDD configuration (such as in LTE R8
In define DL-UL TDD configuration 0~6), and depend on DL business transmission subframe numbers.In this case, in TDD-
In LTE system, need to consider HARQ feedback timing in D2D resource distribution with reduce D2D transmission to its frequency division multiplexing
The received possible influence of HARQ feedback.
Summary of the invention
Resource is found for carrying out D2D Class1 in TDD-LTE system in view of the above problems, the invention proposes one kind
The scheme of configuration.
According to an aspect of the invention, there is provided a kind of match for carrying out D2D Class1 discovery resource in a tdd system
The method set, comprising: TDD configuration mode used in determining；For identified TDD configuration mode, each UL subframe is determined
HFLF, wherein the HFLF of UL subframe indicates the HARQ feedback how many DL subframe is carried in the UL subframe；According to D2D industry
Business demand selects the lower one or more UL subframes of HFLF to find for Class1.
According to another aspect of the present invention, it provides a kind of for carrying out D2D Class1 discovery resource in a tdd system
The device of configuration, comprising: configuration mode determination unit is configured to determine that used TDD configuration mode；HFLF determines single
Member is configured as determining the HFLF of each UL subframe, wherein the HFLF of UL subframe refers to for identified TDD configuration mode
Show the HARQ feedback how many DL subframe is carried in the UL subframe；UL subframe selecting unit is configured as according to D2D industry
Business demand selects the lower one or more UL subframes of HFLF to find for Class1.
Detailed description of the invention
It, will be more preferable geographical after the description below with reference to a specific embodiment of the invention given by following drawings
The solution present invention, and other objects of the present invention, details, features and advantages will become apparent.In the accompanying drawings:
Fig. 1 shows seven kinds of TDD configuration modes defined in LTE R8, wherein the digital indication in each UL subframe should
The HFLF of UL subframe；
Fig. 2 shows the processes of the method according to the present invention for carrying out the discovery resource distribution of D2D Class1 in a tdd system
Figure；
Fig. 3 shows the UL subframe for the use of TDD configuration mode 0 and HFLF being 0 of example 1 according to the present invention for D2D class
The timing diagram that type 1 is found；
Fig. 4 shows the UL subframe for the use of TDD configuration mode 0 and HFLF being 0 and 1 of example 2 according to the present invention for D2D
The timing diagram of Class1 discovery；
Fig. 5 shows the UL subframe for the use of TDD configuration mode 1 and HFLF being 1 of example 3 according to the present invention for D2D class
The timing diagram that type 1 is found；
Fig. 6 shows the UL subframe for the use of TDD configuration mode 3 and HFLF being 2 of example 4 according to the present invention for D2D class
The timing diagram that type 1 is found；
Fig. 7 shows the UL subframe for the use of TDD configuration mode 6 and HFLF being 1 of example 5 according to the present invention for D2D class
The timing diagram that type 1 is found；
Fig. 8 shows one kind of embodiment according to the present invention for carrying out D2D Class1 discovery resource in a tdd system
The schematic diagram of the device of configuration.
Specific embodiment
The preferred embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although showing the present invention in attached drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the present invention without the embodiment party that should be illustrated here
Formula is limited.On the contrary, thesing embodiments are provided so that the present invention is more thorough and complete, and can will be of the invention
Range is fully disclosed to those skilled in the art.
In the present invention, the general of HARQ feedback load factor (HARQ feedback load factor, HFLF) is introduced
It reads, is specific for UL subframe, is used to indicate the number of DL subframe associated with the HARQ feedback in the UL subframe, i.e., should
The HARQ feedback of how many a DL subframes is carried in UL subframe.In FDD LTE, due to DL data transmission subframes and UL HARQ
It is correspondingly, it can be considered that the HFLF of each UL subframe is 1 between feedback subframe.And in TDD LTE, HFLF takes
Certainly change between 0~9 in TDD configuration mode and UL subframe index.Fig. 1 shows seven kinds of TDD defined in LTE R8
Configuration mode 0~6, wherein the HFLF of the digital indication UL subframe in each UL subframe.It is shown in following table 1 TDD
The definition of HARQ feedback timing in LTE.As shown in table 1, for every kind of TDD configuration mode, it is assumed that DL business occurs
In the n-th subframe, then its HARQ feedback appears in the n-th+k subframe, and the number in table 1 below each DL subframe shows digital k.
Table 1
Fig. 2 shows the streams of the method 200 according to the present invention for carrying out the discovery resource distribution of D2D Class1 in a tdd system
Cheng Tu.Method 200 is for example realized in base station or more top network element.It is carried out so that method 200 is realized in a base station as an example below
Description.
Method 200 includes step 210, and base station determines its used TDD configuration mode.
Wherein, TDD configuration mode used in base station is by base station itself or higher network element even operator come basis
Many factors determine.
Preferably, D2D resource distribution can be used in the TDD configuration mode with relatively large UL subframe ratio.Such as Fig. 1
With shown in table 1, the UL subframe ratio of all seven kinds of TDD configuration modes is respectively 60%, 40%, 20%, 30%, 20%,
10% and 50%.Therefore, TDD configuration mode 0,1,3 and 6 is preferably used as needed to carry out D2D resource distribution.However this
Invention is not limited thereto, be currently known and any TDD configuration mode of the following exploitation in can use it is of the invention
Scheme carries out D2D resource distribution.
The reason of selection UL ratio relatively large TDD configuration mode, is: the TDD configuration mode too small for UL ratio
For, there will be larger impact to UL cellular transmission to the resource allocation of D2D, meanwhile, these TDD configuration modes are come
It says, the HFLF of UL subframe is usually larger, this indicates the HARQ feedback of D2D signal pair and its frequency division multiplexing in these UL subframes
With interior transmitting interference be likely to have an impact the HARQ feedback of multiple DL subframes, thus to the DL business of multiple DL subframes
Transmission has an impact, this will lead to big DL loss of throughput.
Next, for identified TDD configuration mode, base station determines the HFLF of each UL subframe in step 220.Such as
Upper described, the HFLF of UL subframe indicates the HARQ feedback how many DL subframe is carried in the UL subframe.
In one implementation, defined in the LTE R8 for seven kinds of TDD configuration modes, identified each UL subframe
HFLF as shown in figure 1 shown in the number in each UL subframe.
In step 230, the lower one or more UL subframes of base station selected HFLF are found for Class1.
For example, can choose the 3rd son in TDD configuration mode 0 for seven kinds of TDD configuration modes shown in FIG. 1
The the 3rd and the 4th subframe, etc. in the 2nd subframe and TDD configuration 3 in frame, TDD configuration mode 1.
Here, the target for selecting the lower UL subframe of HFLF is also to reduce D2D signal as far as possible to DL cellular services
The influence of HARQ feedback.
In one implementation, for identified TDD configuration mode, the UL subframe for being 0 if there is HFLF then be will be present
All or part of UL subframe that HFLF is 0 is configured to neighbours of the D2D resource pool for center of housing estate D2D UE and finds.This be because
For, center of housing estate D2D UE transmitting for the maximum with interior interference effect of base station, therefore, by by center of housing estate D2D UE
It is configured to the UL subframe that HFLF is 0, the HARQ feedback detection of base station will be unaffected.For example, for LTE R8 shown in FIG. 1
For defined seven kinds of TDD configuration modes, when identified TDD configuration mode be 0 when, then by the in the radio frames of part the 3rd and/
Or the 8th sub-frame configuration be used for center of housing estate D2D UE discovery.
In above-mentioned realization, discovery for cell edge D2D UE then has following two specific implementation.
The first specific implementation is also to use the D2D resource pool configuration for the neighbours' discovery for being used for center of housing estate D2D UE
It is found in the neighbours of cell edge D2D UE.That is, center of housing estate D2D UE and cell edge D2D UE share it is same
The D2D resource pool being made of the UL subframe that HFLF is 0.This is because for the UL subframe for the HARQ feedback for not carrying DL business
(i.e. the UL subframe that HFLF is 0) all receives the HARQ feedback of base station regardless of the transmission power that D2D transmission uses is how many
It does not influence, to not influenced on DL data throughout.
It is not that 0 other one or more UL subframes are configured to another D2D money that second of specific implementation, which is by HFLF,
Neighbours of the source pond for cell edge D2D UE have found.In this case, one or more nothings in a D2D discovery period
The UL subframe that the HFLF of line frame is 0 constitutes the neighbor discovery resource pond for being used for center of housing estate D2D UE, and a D2D has found the period
In the HFLF of one or more radio frames be not that 0 other one or more UL subframes are constituted for cell edge D2D UE
Neighbor discovery resource pond.
Here, the UL subframe quantity in radio frames that D2D resource discovering occupies in second of specific implementation is more, from
And in the same number of situation for the radio frames transmitted with D2D, more discovery resources can be obtained.In other words, right
In identical discovery resource size, the radio frames that second of specific implementation needs are less, this is for discontinuous reception (DRX)
Operation, is advantageous, because longer dormancy time can be supported especially for RRC_IDLE D2D UE.Therefore, base station can
To select appropriate one in above two specific implementation according to the concrete condition of cellular system and D2D system traffic load
Kind.
In another implementation, for identified TDD configuration mode, if there is no HFLF for 0 UL subframe (i.e. institute
There is the HFLF of UL subframe to be both greater than 0), then selected one or more UL subframes can be divided into and be used for center of housing estate D2D
The UL subframe of UE and UL subframe for cell edge D2D UE.
Here, the UL subframe for center of housing estate D2D UE of one or more radio frames in a D2D discovery period
The neighbor discovery resource pond for being used for center of housing estate D2D UE is constituted, and a D2D has found one or more radio frames in the period
For cell edge D2D UE UL subframe constitute be used for cell edge D2D UE neighbor discovery resource pond.
Optionally, for the neighbor discovery resource pond of center of housing estate D2D UE, open loop function is configured for center of housing estate D2D UE
Rate control, and for the neighbor discovery resource pond of cell edge D2D UE, fixed transmission power is configured for cell edge D2D UE,
Such as maximum available launch power.This is because for center of housing estate D2D UE, it is solid using open Loop Power control
Determine transmission power, can reduce in base station for by possible band brought by the corresponding received HARQ feedback of resource group
Interior interference.
Hereinafter, it is real to illustrate several examples according to the present invention for seven kinds of TDD configuration modes defined in LTE R8
It is existing.D2D resource distribution is carried out using the higher TDD configuration mode 0,1,3 and 6 of UL subframe ratio as mentioned above, preferably.
Fig. 3 shows the UL subframe for the use of TDD configuration mode 0 and HFLF being 0 of example 1 according to the present invention for D2D class
The timing diagram that type 1 is found.
In example 1, it is assumed that use TDD configuration mode 0, wherein UL subframe ratio is in all seven kinds of TDD configuration modes
It is maximum that (UL: DL=3: 2, i.e. 60%) UL subframe ratio is.In this case, by the HFLF in each radio frames be 0 the 3rd
It is to be found for D2D Class1 with the 8th sub-frame configuration.As shown in Figure 3, a D2D has found this of multiple radio frames in the period
A little UL subframes constitute a Class1 discovery resource pool, and the UL subframe in the discovery resource pool can be not only used for center of housing estate D2D
UE, it can also be used to cell edge D2DUE.
In example 1, to use the 3rd and 8 subframe structure types 1 of all radio frames in a D2D discovery period to send out
It is described for existing resource pool, however, it will be understood by those skilled in the art that the example can be deformed into use completely
D2D has found the 3rd and 8 subframes of the part radio frames in the period, or carrys out the discovery money of structure types 1 using only the 3rd or the 8th subframe
Source pond.For example, base station can choose the nothing found D2D in the period in every 2 radio frames when D2D portfolio is less
3rd and the 8th subframe of line frame constitutes discovery resource pool, or only by a nothing in each radio frames or several every radio frames
The 3rd subframe (or the 8th subframe) of line frame constitutes discovery resource pool.
Fig. 4 shows the UL subframe for the use of TDD configuration mode 0 and HFLF being 0 and 1 of example 2 according to the present invention for D2D
The timing diagram of Class1 discovery.
In example 2, it is assumed that use TDD configuration mode 0, wherein UL subframe ratio is in all seven kinds of TDD configuration modes
It is maximum that (UL: DL=3: 2, i.e. 60%) UL subframe ratio is.It, will in order to provide more discovery resources in limited radio frames
The sub-frame configuration of the 3rd, 4,8 and 9 in each radio frames is D2D Class1 discovery subframe, wherein as shown in Figure 4, a D2D hair
The UL subframe (such as the 3rd and/or the 8th subframe) that the HFLF of multiple radio frames in the existing period is 0 is constituted for center of housing estate
The Class1 of D2D UE finds resource pool, and UL subframe that the HFLF in multiple radio frames is 1 (such as the 2nd, 4,7, in 9 subframes
It is any one or more) constitute for cell edge D2D UE another Class1 find resource pool.
Here, D2D UE is in center of housing estate or cell edge can be based on base station in system information block by D2D UE
(SIB) reception signal reference power (RSRP) threshold value broadcasted in signaling and automatically determine.In this way, center of housing estate
D2D UE and cell edge D2D UE adverse effect received for the HARQ feedback of base station can ignore.
Example 2 is compared with example 1, in the same number of situation for the radio frames transmitted with D2D, can obtain more
Discovery resource, or, in other words, for identical discovery resource size, example 2 need radio frames it is less, this for
DRX operation, is advantageous, because longer dormancy time can be supported especially for RRC_IDLE D2D UE.
In examples detailed above 2, to use the subframe of the 3rd, 4,8 and 9 in each radio frames as Class1 discovery subframe
It is described, however, it will be understood by those skilled in the art that the example can be deformed into completely using the 3rd and/or the 8th son
Frame and the 2nd, 4,7, any one or more any combination in 9 subframes.For example, according to D2D portfolio or other considerations, base
Station can choose the discovery resource pool for constituting the 3rd and 8 subframes of each radio frames and being directed to center of housing estate D2D UE, and will be each
2nd and/or 7 subframes of radio frames constitute the discovery resource pool for being directed to cell edge D2D UE.In another example base station can choose by
3rd subframe of each radio frames constitutes the discovery resource pool for being directed to center of housing estate D2D UE, and sub by the 2nd of every two radio frames the
Frame constitutes the discovery resource pool for being directed to cell edge D2D UE.
Fig. 5 shows the UL subframe for the use of TDD configuration mode 1 and HFLF being 1 of example 3 according to the present invention for D2D class
The timing diagram that type 1 is found.
In example 3, it is assumed that use TDD configuration mode 1, wherein UL-DL ratio is DL: UL=3: 2, i.e. UL subframe ratio
It is 40%.It in this case, is to be used for D2D Class1 hair by the 2nd and the 7th sub-frame configuration that HFLF in each radio frames is 1
It is existing.In order to solve D2D transmission to by the received possible influence of the HARQ feedback with interior transmitting, a D2D was had found in the period
These UL subframes of multiple radio frames are also divided into two Class1 discovery resource pools, and one by being directed to center of housing estate D2D UE
The 2nd subframe constitute, another for the 7th subframe of cell edge D2D UE by constituting, as shown in Figure 5.
Note that it is optional, for the discovery resource pool for center of housing estate D2D UE, can match for center of housing estate D2D UE
Open Loop Power control is set, to reduce possible influence received for HARQ feedback.And the discovery for cell edge D2D UE
Resource pool can configure fixed transmission power, such as 23dBm for cell edge D2D UE, because of its path loss to base station
It is relatively large.
Equally, D2D UE is in center of housing estate or cell edge can be wide in SIB signaling based on base station by D2D UE
The RSRP threshold value broadcast and automatically determine.
In examples detailed above 3, to use the 2nd and 7 subframes in each radio frames as carrying out for Class1 discovery subframe
Description, however, it will be understood by those skilled in the art that the example can be deformed into completely using in the 2nd, 3,7,8 subframes
Any one or more any combination.For example, base station can choose will be each wireless according to D2D portfolio or other considerations
2nd and 7 subframes of frame constitute the discovery resource pool for being directed to center of housing estate D2D UE, and sub by the 3rd and/or the 8 of each radio frames
Frame constitutes the discovery resource pool, etc. for being directed to cell edge D2D UE.
Fig. 6 shows the UL subframe for the use of TDD configuration mode 3 and HFLF being 2 of example 4 according to the present invention for D2D class
The timing diagram that type 1 is found.
In example 4, it is assumed that use TDD configuration mode 3, wherein UL-DL ratio is DL: UL=7: 3, i.e. UL subframe ratio
It is 30%.It in this case, is to be used for D2D Class1 hair by the 3rd and the 4th sub-frame configuration that HFLF in each radio frames is 2
It is existing.In order to solve D2D transmission to by the received possible influence of the HARQ feedback with interior transmitting, a D2D was had found in the period
These UL subframes of multiple radio frames are also divided into two Class1 discovery resource pools, and one by being directed to center of housing estate D2D UE
The 3rd subframe constitute, another for the 4th subframe of cell edge D2D UE by constituting, as shown in Figure 6.
Note that it is similar with example 3, it can be small for the discovery resource pool for center of housing estate D2D UE optionally
District center D2D UE configures open Loop Power control, to reduce possible influence received for HARQ feedback.And for cell side
The discovery resource pool of edge D2D UE can configure fixed transmission power, such as 23dBm for cell edge D2D UE, because its is right
The path loss of base station is relatively large.
Equally, D2D UE is in center of housing estate or cell edge can be wide in SIB signaling based on base station by D2D UE
The RSRP threshold value broadcast and automatically determine.
In examples detailed above 4, to use the 3rd and 4 subframes in each radio frames as carrying out for Class1 discovery subframe
Description, however, it will be understood by those skilled in the art that the example completely can be deformed into using appointing in the 2nd, 3,4 subframes
Any combination for one or more of anticipating.For example, base station can choose each radio frames according to D2D portfolio or other considerations
The 3rd and 4 subframes constitute be directed to center of housing estate D2D UE discovery resource pool, and by the 2nd subframe of each radio frames constitute needle
To the discovery resource pool of cell edge D2D UE.
Fig. 7 shows the UL subframe for the use of TDD configuration mode 6 and HFLF being 1 of example 5 according to the present invention for D2D class
The timing diagram that type 1 is found.
In example 5, it is assumed that use TDD configuration mode 6, wherein UL-DL ratio is DL: UL=5: 5, i.e. UL subframe ratio
It is 50%.In this case, as an example of resource distribution, by the 4th and the 8th son that HFLF in each radio frames is 1
Frame is configured for the discovery of D2D Class1.In order to solve D2D transmission to by the received possible shadow of the HARQ feedback with interior transmitting
It rings, these UL subframes of multiple radio frames in D2D discovery period are also divided into two Class1 discovery resource pools, and one
A the 4th subframe by for center of housing estate D2DUE is constituted, another is made of the 8th subframe for cell edge D2D UE, such as
Shown in Fig. 7.
It, optionally, can be with for the discovery resource pool for center of housing estate D2D UE note that similar with example 3 and 4
Open Loop Power control is configured for center of housing estate D2D UE, to reduce possible influence received for HARQ feedback.And for small
The discovery resource pool of area edge D2D UE can configure fixed transmission power, such as 23dBm for cell edge D2D UE, because
It is relatively large to the path loss of base station.
Equally, D2D UE is in center of housing estate or cell edge can be wide in SIB signaling based on base station by D2D UE
The RSRP threshold value broadcast and automatically determine.
In examples detailed above 5, to use the 4th and 8 subframes in each radio frames as carrying out for Class1 discovery subframe
Description, however, it will be understood by those skilled in the art that the example can be deformed into completely using in 2,3,4,7,8 subframes
Any one or more any combination.
Fig. 8 shows one kind of embodiment according to the present invention for carrying out D2D Class1 discovery resource in a tdd system
The schematic diagram of the device 800 of configuration.Device 800 is for example realized in base station or more top network element.
As shown in Figure 8, device 800 includes configuration mode determination unit 810, is configured to determine that used TDD
Configuration mode；HFLF determination unit 820 is configured as determining each UL subframe for identified TDD configuration mode
HFLF, wherein the HFLF of UL subframe indicates the HARQ feedback how many DL subframe is carried in the UL subframe；And UL subframe choosing
Unit 830 is selected, is configured as selecting the lower one or more UL subframes of HFLF to send out for Class1 according to D2D business demand
It is existing.
In one implementation, device 800 further includes D2D resource pool configuration unit 840, is configured as identified
TDD configuration mode, the UL subframe for being 0 if there is HFLF then configure the HFLF all or part of UL subframe for being 0 to
Neighbours of the D2D resource pool for center of housing estate D2D UE have found.
In one implementation, which is also configured to cell edge D2D by D2D resource pool configuration unit 840
The neighbours of UE have found.
In one implementation, device 800 further includes another D2D resource pool configuration unit 850, is configured as HFLF not
Neighbours discovery of another D2D resource pool for cell edge D2D UE is configured to for 0 other one or more UL subframes.Wherein
All or part of UL subframe that the HFLF of one or more radio frames in one D2D discovery period is 0 is constituted in cell
The neighbor discovery resource pond of heart D2D UE, the HFLF of one or more radio frames in D2D discovery period be not 0 it is described
Other one or more UL subframes constitute the neighbor discovery resource pond for being used for cell edge D2D UE.
It in one implementation, is 0 if there is no HFLF for identified TDD configuration mode in device 800
Selected one or more UL subframes are then divided into and are used for the UL subframe of center of housing estate D2D UE and are used for cell by UL subframe
The UL subframe of edge D2D UE.One or more radio frames in the one of D2D discovery period are used for center of housing estate D2D
The UL subframe of UE constitutes the neighbor discovery resource pond for being used for center of housing estate D2D UE, and one in a D2D discovery period
Or the UL subframe for cell edge D2D UE of multiple radio frames constitutes the neighbor discovery resource for being used for cell edge D2D UE
Pond.
In one implementation, device 800 further includes power control unit 860, is configured as the center of housing estate
The neighbor discovery resource pond of D2D UE configures open Loop Power control for center of housing estate D2D UE；And for the cell edge
The discovery resource pool of D2D UE configures fixed transmission power for cell edge D2D UE.
Invention proposes the system designs for the D2D Class1 discovery resource distribution in TDD system.It is anti-based on HARQ
The concept of feedback load factor (HFLF) proposes a group resource allocation method.Through the invention, D2D transmission is for by with interior hair
The received possible influence of HARQ feedback can be effectively eliminated in the subframe penetrated, to make the DL business throughput generated loss
It is as small as possible.
In the raw design of one or more examples, this can be realized with hardware, software, firmware or their any combination
The application function.If realized with software, can be stored the function as one or more instruction or code
On a computer-readable medium, or as on computer-readable medium one or more instructions or code transmit.It calculates
Machine readable medium includes computer storage media and communication media, and wherein communication media includes facilitating computer program from one
Place is transmitted to the arbitrary medium of another place.Storage medium can be general or specialized computer-accessible any available
Medium.This computer-readable medium may include, such as, but not limited to, RAM, ROM, EEPROM, CD-ROM or other CDs
Store equipment, disk storage equipment or other magnetic storage apparatus, either can be used for general or specialized computer or it is general or
The form of the addressable instruction of application specific processor or data structure come code modules desired by carrying or store it is any its
Its medium.Also, it is any to connect the computer-readable medium that be known as.For example, if software be using coaxial cable,
The wireless technology of optical fiber cable, twisted pair, Digital Subscriber Line (DSL) or such as infrared ray, radio and microwave etc is come from net
It stands, server or other remote sources transmission, then coaxial cable, optical fiber cable, twisted pair, DSL or such as infrared ray, wireless
The wireless technology of electricity and microwave etc is also included in the definition of medium.
General processor, digital signal processor (DSP), specific integrated circuit (ASIC), field programmable gate can be used
Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or for executing sheet
Any combination of function described in text come realize or execute combine the disclosure described in various illustrative logical blocks, module and
Circuit.General processor can be microprocessor, alternatively, processor is also possible to any common processor, controller, micro-control
Device or state machine processed.Processor also can be implemented as calculating the combination of equipment, for example, the combination of DSP and microprocessor, multiple
The combination or any other such structure of microprocessor, one or more microprocessors and DSP core.
Those of ordinary skill in the art should also understand that, the various illustrative logics described in conjunction with embodiments herein
The combination of electronic hardware, computer software or both may be implemented into block, module, circuit and algorithm steps.In order to understand earth's surface
Show this interchangeability between hardware and software, various illustrative components, block, module, circuit and step are enclosed above
General description has been carried out around its function.Hardware is implemented as this function and is also implemented as software, is depended on specific
Using and apply design constraint over the whole system.Those skilled in the art can be directed to every kind of specific application, to become
Logical mode realizes described function, and still, this realization decision should not be interpreted as causing a departure from the scope of this disclosure.
The above description of the disclosure is for can be realized any those of ordinary skill of this field or using the present invention.It is right
For those of ordinary skill in the art, the various modifications of the disclosure be will be apparent from, and generality defined herein
Principle can also be applied to other deformations in the case where without deviating from the spirit and scope of the disclosed invention.Therefore, the present invention is simultaneously
It is not limited to example and design as described herein, but it is consistent with the widest scope of principle disclosed herein and novel features.
Claims (14)
1. a kind of for carrying out the side of equipment room direct communication D2D Class1 discovery resource distribution in TDD system
Method, comprising:
TDD configuration mode used in determining；
For identified TDD configuration mode, the hybrid automatic repeat-request HARQ feedback load of each uplink UL subframe is determined
Factor HFLF, wherein the HFLF of UL subframe indicates the HARQ feedback how many downlink DL subframe is carried in the UL subframe；
According to D2D business demand, the lower one or more UL subframes of HFLF is selected to find for Class1.
2. the method as described in claim 1, wherein
For identified TDD configuration mode, the UL subframe for being 0 if there is HFLF, then by the HFLF whole for being 0 or portion
Point UL subframe is configured to neighbours of the D2D resource pool for center of housing estate D2D user equipment (UE) and finds.
3. method according to claim 2, wherein
The D2D resource pool is additionally configured to neighbours' discovery of cell edge D2D UE.
4. method according to claim 2, further includes:
It is not that 0 other one or more UL subframes are configured to another D2D resource pool and are used for cell edge D2D UE by HFLF
Neighbours' discovery,
All or part of UL subframe that the HFLF of one or more radio frames in one of D2D discovery period is 0, which is constituted, to be used
The HFLF of one or more radio frames in the neighbor discovery resource pond of center of housing estate D2D UE, a D2D discovery period is not
The neighbor discovery resource pond for being used for cell edge D2D UE is constituted for other one or more UL subframes described in 0.
5. the method as described in claim 1, wherein
For identified TDD configuration mode, the UL subframe for being 0 if there is no HFLF, then by selected one or more
UL subframe is divided into the UL subframe for center of housing estate D2D UE and the UL subframe for cell edge D2D UE,
The UL subframe for center of housing estate D2D UE of one or more radio frames in one of D2D discovery period, which is constituted, to be used
In the neighbor discovery resource pond of center of housing estate D2D UE, and a D2D has found the use of one or more radio frames in the period
The neighbor discovery resource pond for being used for cell edge D2D UE is constituted in the UL subframe of cell edge D2D UE.
6. method as claimed in claim 5, further includes:
For the neighbor discovery resource pond of the center of housing estate D2D UE, open Loop Power control is configured for center of housing estate D2D UE；
For the discovery resource pool of the cell edge D2D UE, fixed transmission power is configured for cell edge D2D UE.
7. the method as described in claim 1, wherein
For TDD configuration mode 0 defined in LTE Release-8, each radio frames the 2nd, 3,4,7,8,9 subframes be UL
Frame, corresponding HFLF are respectively 1,0,1,1,0,1；
For TDD configuration mode 1 defined in LTE Release-8, each radio frames the 2nd, 3,7,8 subframes be UL subframe,
Its corresponding HFLF is respectively 1,2,1,2；
For TDD configuration mode 2 defined in LTE Release-8, each radio frames the 2nd, 7 subframes be UL subframe, it is right
The HFLF answered is respectively 4,4；
For TDD configuration mode 3 defined in LTE Release-8, each radio frames the 2nd, 3,4 subframes be UL subframe,
Corresponding HFLF is respectively 3,2,2；
For TDD configuration mode 4 defined in LTE Release-8, each radio frames the 2nd, 3 subframes be UL subframe, it is right
The HFLF answered is respectively 4,4；
For TDD configuration mode 5 defined in LTE Release-8, the 2nd subframe of each radio frames is UL subframe, is corresponded to
HFLF be 9；
For TDD configuration mode 6 defined in LTE Release-8, each radio frames the 2nd, 3,4,7,8 subframes be UL
Frame, corresponding HFLF are respectively 1,1,1,1,1.
8. a kind of for carrying out the dress of equipment room direct communication D2D Class1 discovery resource distribution in TDD system
It sets, comprising:
Configuration mode determination unit is configured to determine that used TDD configuration mode；
HFLF determination unit, be configured as determining identified TDD configuration mode the mixing of each uplink UL subframe from
Dynamic retransmission request HARQ feedback load factor HFLF, wherein the HFLF of UL subframe indicate to carry in the UL subframe how many under
The HARQ feedback of row DL subframe；
UL subframe selecting unit is configured as selecting the lower one or more UL subframes of HFLF to use according to D2D business demand
It is found in Class1.
9. device as claimed in claim 8, further includes:
D2D resource pool configuration unit is configured as UL for being 0 if there is HFLF for identified TDD configuration mode
Frame then configures D2D resource pool for the HFLF all or part of UL subframe for being 0 and is used for center of housing estate D2D user equipment (UE)
Neighbours discovery.
10. device as claimed in claim 9, wherein
The D2D resource pool configuration unit also finds the neighbours that the D2D resource pool is configured to cell edge D2D UE.
11. device as claimed in claim 9, further includes:
Another D2D resource pool configuration unit is configured as not being that 0 other one or more UL subframes are configured to separately by HFLF
Neighbours discovery of the one D2D resource pool for cell edge D2D UE,
All or part of UL subframe that the HFLF of one or more radio frames in one of D2D discovery period is 0, which is constituted, to be used
The HFLF of one or more radio frames in the neighbor discovery resource pond of center of housing estate D2D UE, a D2D discovery period is not
The neighbor discovery resource pond for being used for cell edge D2D UE is constituted for other one or more UL subframes described in 0.
12. device as claimed in claim 8, wherein
For identified TDD configuration mode, the UL subframe for being 0 if there is no HFLF, then by selected one or more
UL subframe is divided into the UL subframe for center of housing estate D2D UE and the UL subframe for cell edge D2D UE,
The UL subframe for center of housing estate D2D UE of one or more radio frames in one of D2D discovery period, which is constituted, to be used
In the neighbor discovery resource pond of center of housing estate D2D UE, and a D2D has found the use of one or more radio frames in the period
The neighbor discovery resource pond for being used for cell edge D2D UE is constituted in the UL subframe of cell edge D2D UE.
13. device as claimed in claim 12, further includes:
Power control unit is configured as the neighbor discovery resource pond for the center of housing estate D2D UE, is center of housing estate
D2D UE configures open Loop Power control；It and is cell edge D2D for the discovery resource pool of the cell edge D2D UE
UE configures fixed transmission power.
14. device as claimed in claim 8, wherein
For TDD configuration mode 0 defined in LTE Release-8, each radio frames the 2nd, 3,4,7,8,9 subframes be UL
Frame, corresponding HFLF are respectively 1,0,1,1,0,1；
For TDD configuration mode 1 defined in LTE Release-8, each radio frames the 2nd, 3,7,8 subframes be UL subframe,
Its corresponding HFLF is respectively 1,2,1,2；
For TDD configuration mode 2 defined in LTE Release-8, each radio frames the 2nd, 7 subframes be UL subframe, it is right
The HFLF answered is respectively 4,4；
For TDD configuration mode 3 defined in LTE Release-8, each radio frames the 2nd, 3,4 subframes be UL subframe,
Corresponding HFLF is respectively 3,2,2；
For TDD configuration mode 4 defined in LTE Release-8, each radio frames the 2nd, 3 subframes be UL subframe, it is right
The HFLF answered is respectively 4,4；
For TDD configuration mode 5 defined in LTE Release-8, the 2nd subframe of each radio frames is UL subframe, is corresponded to
HFLF be 9；
For TDD configuration mode 6 defined in LTE Release-8, each radio frames the 2nd, 3,4,7,8 subframes be UL
Frame, corresponding HFLF are respectively 1,1,1,1,1.
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