CN107135526A - A kind of method of determination D2D via nodes, base station - Google Patents
A kind of method of determination D2D via nodes, base station Download PDFInfo
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Abstract
The invention discloses a kind of method of determination D2D via nodes, base station；Wherein, this method includes：It is that repeated link determines at least two candidate relay nodes in the Y node in the D2D node preset ranges of distance the first；Pre-estimation first object transmission rate；The target transmission speed of pre-estimation at least two second；The optimal average transmission rate of pre-estimation first；The optimal average transmission rate of pre-estimation at least two second；According to first object transmission rate, at least two second target transmission speeds, the first optimal Mean Speed and at least two second optimal Mean Speeds, determine at least two candidate relay node whether be repeated link via node.The message transmission rate of D2D terminals can be at least lifted using the present invention, the selfishness of terminal is met.
Description
Technical field
The present invention relates to device-to-device (D2D, Device-to-Device) relaying technique, and in particular to one
Plant the method for determining D2D via nodes, base station.
Background technology
In the field of communications, the D2D communication technologys refer to that terminal room can directly carry out data in short range
Transmission, it is not necessary to base station forwarding technology.D2D communication direct-connected communication mode have high data rate,
The advantage such as low transmission delay and low-power consumption.Under some application scenarios, D2D networks as shown in Figure 1 are with passing
It is straight between terminal except that can use for D2D terminals in the hybrid network that coexists of system Cellular Networks
Even communication mode, can also use D2D trunking traffic modes, i.e., between information source terminal and destination end except
The transmission of data can be directly carried out, by least one other node data can also be carried out with transfer and put
The big D2D trunking traffics realized between information source terminal and destination end.Title can be realized carries out transfer to data
The node of function is via node.The via node is specifically as follows terminal.Pass through following two mechanism at present
Link terminal is selected：One way in which be allow information source (transmitting terminal) from neighbouring terminal with
Machine selects a link terminal to forward the data to the stay of two nights (receiving terminal) by the link terminal；Another side
Formula is that the adjacent terminals for allowing selection two and the above as link terminal and provide same D2D transmitting terminals
Need to will send information to the stay of two nights by selected multiple link terminals in synchronization.And in practical application
In, each terminal in network, which is respectively provided with certain selfishness, i.e. chosen link terminal, to be needed in cooperation
The middle increase for obtaining certain interests such as transmission rate, and the link terminal selected by both above mechanism
This characteristic of terminal is not considered.
The content of the invention
To solve existing technical problem, the embodiment of the present invention provides a kind of determination D2D via nodes
Method and base station, at least disclosure satisfy that the selfishness of terminal, can lift the message transmission rate of D2D terminals.
What the technical scheme of the embodiment of the present invention was realized in：
The embodiment of the present invention provides a kind of method of determination D2D via nodes, and methods described includes：
In the Y node in the D2D node preset ranges of distance the first, Y is positive integer, for relaying chain
Road determines at least two candidate relay nodes, and the transmitting terminal of the repeated link is the first D2D nodes；
Pre-estimation first object transmission rate, the first object transmission rate is that the first D2D nodes pass through certainly
The D2D of body lead directly to link transmission data to the repeated link receiving terminal when transmission rate；
The candidate relay node of pre-estimation at least two respective D2D lead directly to link on transmission rate, obtain to
Few two the second target transmission speeds；
The optimal average transmission rate of pre-estimation first, the first optimal average transmission rate is the first D2D nodes
Optimal average transmission rate of data when being forwarded to the receiving terminal by least two candidate relay nodes；
The optimal average transmission rate of pre-estimation at least two second, the second optimal average transmission rate is each
The partial data of candidate relay node is forwarded through the first D2D nodes and another part data are through itself straight-through chain
Transmit to the optimal average transmission rate during information destination node matched with the candidate relay node on road；
According to first object transmission rate, at least two second target transmission speeds, the first optimal Mean Speed
And at least two second optimal Mean Speeds, whether determine at least two candidate relay node is described
The via node of repeated link.
In such scheme, the optimal Mean Speed of the foundation first, at least two second optimal Mean Speeds,
First object transmission rate and at least two second target transmission speeds, are determined at least two candidate
After node whether be repeated link via node, including：
Described first optimal Mean Speed and first object transmission rate are compared；
At least two second optimal Mean Speed and at least two second target transmission speed are carried out
Correspondence compares；
When the described first optimal Mean Speed is more than first object transmission rate and each second optimal average speed
When rate is more than corresponding second target transmission speed, in determining that at least two candidate relay node is described
After the via node of link.
In such scheme, in the Y node in the D2D node preset ranges of distance the first, it is determined that
At least two candidate relay nodes in repeated link, including：
Obtain the channel condition information of each node in Y node；
According to the channel condition information of Y node, Y joint transmission speed is obtained；
The joint transmission speed of maximum, secondary big joint transmission speed are selected from Y joint transmission speed；
In Y node, it is determined that node corresponding with maximum joint transmission speed, with secondary big combining biography
The corresponding node of defeated probability is the candidate relay node, and the quantity of the candidate relay node is two.
In such scheme, the channel condition information according to Y node obtains Y joint transmission speed,
Including：
When the first D2D nodes are terminal sk, receiving terminal be terminal dkWhen,
The D2D nodes of pre-estimation the first and receiving terminal transmit signal to noise ratio during data by tie link, obtain the
One signal to noise ratio；
For one of node s in Y nodem, m=1,2 ... Y and m ≠ k,
According to node smChannel condition information, pre-estimation the first D2D nodes send data via node
smData are from the first D2D node-node transmissions to node s when being forwarded to the receiving terminalmSignal to noise ratio, from node
smTransmit to the signal to noise ratio of the receiving terminal, obtain the second signal to noise ratio, the 3rd signal to noise ratio；
According to the first signal to noise ratio, the second noise when the 3rd signal to noise ratio, joint transmission speed is obtained.
In such scheme, methods described also includes：
For node sm,
According to formulaObtain sending in the first D2D nodes
Data are via node smIt is forwarded to the joint transmission speed during receiving terminalWherein,For first
Signal to noise ratio,For the second signal to noise ratio,For the 3rd signal to noise ratio, W is link bandwidth.
In such scheme, the pre-estimation first object transmission rate, the candidate relay section of pre-estimation at least two
The transmission rate that point is led directly on link in respective D2D, obtains at least two second target transmission speeds, including：
When the quantity of the candidate relay node is two,
Obtain the channel condition information of the first D2D nodes；
Obtain the channel condition information of two candidate relay nodes；
According to the channel condition information of the first D2D nodes, the D2D nodes of pre-estimation the first and the receiving terminal
In the signal to noise ratio of tie link transmitting data, the first signal to noise ratio is obtained；
According to the channel condition information of each candidate relay node, determine candidate relay node and with the candidate
After the corresponding information destination node of node in the signal to noise ratio of tie link transmitting data, two the 4th signal to noise ratio are obtained；
According to the first signal to noise ratio, first object transmission rate is obtained；
According to two the 4th signal to noise ratio, two the second target transmission speeds are obtained.
In such scheme, methods described includes：
First signal to noise ratio, two the 4th signal to noise ratio are substituting to respectivelyObtain first
Target transmission speed, two the second target transmission speeds；
Wherein, γ is worked asa,bWhen being expressed as the first signal to noise ratio, WabThe first D2D nodes are expressed as to the receiving terminal
Tie link distribution bandwidth,It is expressed as first object transmission rate；
Work as γa,bWhen representing one of them four signal to noise ratio, WabIt is expressed as the γa,bCorresponding candidate relay node is extremely
The bandwidth of the tie link distribution of the information destination node matched with the candidate relay node,It is expressed as the second target
Transmission rate.
In such scheme, the optimal average transmission rate of the pre-estimation first, pre-estimation at least two second is most
Before excellent average transmission rate, including：
When the quantity of the second optimal average transmission rate is two,
The first average transmission rate is determined, first average transmission rate is to be sent in the first D2D nodes
Data are forwarded to up to the average transmission rate in the case of the receiving terminal by two candidate relay nodes；
Two the second average transmission rates are determined, second average transmission rate is each candidate relay node
The partial data of transmission is forwarded by the first D2D nodes and straight-through link of another part data through itself is passed
Average transmission rate in the case of the information destination node that defeated arrival matches with the candidate relay node；
Determine that the first D2D nodes send data to the receiving terminal via two candidate relay node forwardings
When the quantity of resource block that uses, obtain first resource number of blocks；
Determine relaying of the first D2D nodes as each candidate relay node into correspondence information destination node link
Node carries out the quantity of used resource block during data forwarding, obtains two Secondary resource numbers of blocks；
According to the first average transmission rate, two the second average transmission rates, first resource number of blocks, two
Secondary resource number of blocks, sets up resource allocator model；
Accordingly, the optimal average transmission rate of the pre-estimation first, pre-estimation at least two second is optimal flat
Equal transmission rate, including：
Resource allocator model is solved, the first best resource blocks quantity, two the second optimal resources are obtained
Number of blocks；
According to the first best resource blocks quantity, two the second best resource blocks quantity, first is obtained optimal average
Transmission rate, two the second optimal average transmission rates.
In such scheme, the first best resource blocks of foundation quantity, two the second best resource blocks quantity,
The first optimal average transmission rate, two the second optimal average transmission rates are obtained, including：
When the first best resource blocks quantity isTwo the second best resource blocks quantity are xiAnd xjWhen,
By the first best resource blocks quantityIt is substituting toObtain the first optimal average transmission speed
RateWherein, L is the total quantity for the resource block for distributing to every D2D link,Represent from the
One D2D nodes skBy two candidate relay node siAnd sjThe receiving terminal being forwarded to up to the repeated link
Hold dkJoint transmission speed；
WillxiIt is substituting toObtain a second optimal average transmission
Speed, wherein,For from siBy skReach and siThe information destination node d matchediJoint transmission speed；For siPass through straight-through link transmission data to diThe second target transmission speed
WillxjIt is substituting toObtain another second optimal average
Transmission rate, wherein,For from sjBy skReach and sjThe information destination node d matchedjJoint pass
Defeated speed；For sjPass through straight-through link transmission data to djThe second target transmission speed
The embodiment of the present invention also provides a kind of base station, and the base station includes：
First determining unit, in the Y node in the D2D node preset ranges of distance the first, Y
It is that repeated link determines at least two candidate relay nodes, the transmitting terminal of the repeated link is institute for positive integer
State the first D2D nodes；
First pre-estimation unit, for pre-estimation first object transmission rate, the first object transmission rate
Link transmission data is led directly to the receiving terminal of the repeated link by the D2D of itself for the first D2D nodes
Transmission rate；
And the transmission rate that the candidate relay node of pre-estimation at least two is led directly on link in respective D2D, obtain
To at least two second target transmission speeds；
Second pre-estimation unit, it is optimal average for the optimal average transmission rate of pre-estimation first, described first
Transmission rate is by least two candidate relay nodes to be forwarded to described connect in the data of the first D2D nodes
The optimal average transmission rate of receiving end；
And the optimal average transmission rate of pre-estimation at least two second, the second optimal average transmission rate
The partial data sent for each candidate relay node is forwarded through the first D2D nodes and another part data are passed through
The optimal average transmission of itself straight-through link transmission to the information destination node matched with the candidate relay node is fast
Rate；
Second determining unit, for according to first object transmission rate, at least two second target transmission speeds,
First optimal Mean Speed and at least two second optimal Mean Speeds, are determined at least two candidate
After node whether be repeated link via node.
In such scheme, second determining unit is additionally operable to：
Described first optimal Mean Speed and first object transmission rate are compared；
At least two second optimal Mean Speed and at least two second target transmission speed are carried out
Correspondence compares；
When the described first optimal Mean Speed is more than first object transmission rate and each second optimal average speed
When rate is more than corresponding second target transmission speed, in determining that at least two candidate relay node is described
After the via node of link.
In such scheme, first determining unit is additionally operable to：
Obtain the channel condition information of each node in Y node；
According to the channel condition information of Y node, Y joint transmission speed is obtained；
The joint transmission speed of maximum, secondary big joint transmission speed are selected from Y joint transmission speed；
In Y node, it is determined that node corresponding with maximum joint transmission speed, with secondary big combining biography
The corresponding node of defeated probability is the candidate relay node, and the quantity of the candidate relay node is two.
In such scheme, first determining unit is additionally operable to：
When the first D2D nodes are terminal sk, the receiving terminal be terminal dkWhen,
The D2D nodes of pre-estimation the first and the receiving terminal transmit signal to noise ratio during data by tie link, obtain
To the first signal to noise ratio；
For one of node s in Y nodem, m=1,2 ... Y and m ≠ k,
According to node smChannel condition information, pre-estimation the first D2D nodes send data via node
smData are from the first D2D node-node transmissions to node s when being forwarded to the receiving terminalmSignal to noise ratio, from node
smTransmit to the signal to noise ratio of the receiving terminal, obtain the second signal to noise ratio, the 3rd signal to noise ratio；
According to the first signal to noise ratio, the second noise when the 3rd signal to noise ratio, joint transmission speed is obtained.
In such scheme, first determining unit is additionally operable to：
For node sm,
According to formulaObtain sending in the first D2D nodes
Data are via node smIt is forwarded to the joint transmission speed during receiving terminalWherein,For first
Signal to noise ratio,For the second signal to noise ratio,For the 3rd signal to noise ratio, W is link bandwidth.
In such scheme, the first pre-estimation unit is additionally operable to：
When the quantity of the candidate relay node is two,
Obtain the channel condition information of the first D2D nodes；
Obtain the channel condition information of two candidate relay nodes；
According to the channel condition information of the first D2D nodes, the D2D nodes of pre-estimation the first and the receiving terminal
In the signal to noise ratio of tie link transmitting data, the first signal to noise ratio is obtained；
According to the channel condition information of each candidate relay node, determine candidate relay node and with the candidate
After the corresponding information destination node of node in the signal to noise ratio of tie link transmitting data, two the 4th signal to noise ratio are obtained；
According to the first signal to noise ratio, first object transmission rate is obtained；
According to two the 4th signal to noise ratio, two the second target transmission speeds are obtained.
In such scheme, the first pre-estimation unit is additionally operable to：
First signal to noise ratio, two the 4th signal to noise ratio are substituting to respectivelyObtain first
Target transmission speed, two the second target transmission speeds；
Wherein, γ is worked asa,bWhen being expressed as the first signal to noise ratio, WabFor the straight of the first D2D nodes to the receiving terminal
The bandwidth distributed up to link,It is expressed as first object transmission rate；
Work as γa,bWhen representing one of them four signal to noise ratio, WabFor the γa,bCorresponding candidate relay node to this
The bandwidth of the tie link distribution of the information destination node of candidate relay node matching,It is expressed as the second object transmission
Speed.
In such scheme, the base station also includes：
First processing units, for when the second optimal average transmission rate quantity be two when,
The first average transmission rate is determined, first average transmission rate is to be sent in the first D2D nodes
Data are forwarded to up to the average transmission rate in the case of the receiving terminal by two candidate relay nodes；
Two the second average transmission rates are determined, second average transmission rate is each candidate relay node
The partial data of transmission is forwarded by the first D2D nodes and straight-through link of another part data through itself is passed
Average transmission rate in the case of the information destination node that defeated arrival matches with the candidate relay node；
Determine that the first D2D nodes send data to the receiving terminal via two candidate relay node forwardings
When the quantity of resource block that uses, obtain first resource number of blocks；
Determine relaying of the first D2D nodes as each candidate relay node into correspondence information destination node link
Node carries out the quantity of used resource block during data forwarding, obtains two Secondary resource numbers of blocks；
According to the first average transmission rate, two the second average transmission rates, first resource number of blocks, two
Secondary resource number of blocks, sets up resource allocator model；
Accordingly, second determining unit, is additionally operable to：
Resource allocator model is solved, the first best resource blocks quantity, two the second optimal resources are obtained
Number of blocks；
According to the first best resource blocks quantity, two the second best resource blocks quantity, first is obtained optimal average
Transmission rate, two the second optimal average transmission rates.
In such scheme, second determining unit is used for：
When the first best resource blocks quantity isTwo the second best resource blocks quantity are xiAnd xjWhen,
By the first best resource blocks quantityIt is substituting toObtain the first optimal average transmission speed
RateWherein, L is the total quantity for the resource block that every D2D link is used,Represent from first
D2D nodes skBy two candidate relay node siAnd sjBe forwarded to up to the receiving terminal dkJoint transmission
Speed；
WillxiIt is substituting toObtain a second optimal average transmission
Speed, wherein,For from siBy skReach and siThe D2D information destination nodes d matchediJoint pass
Defeated speed；For siPass through straight-through link transmission data to diThe second target transmission speed
WillxjIt is substituting toObtain another second optimal average
Transmission rate, wherein,For from sjBy skReach and sjThe D2D information destination nodes d matchedjConnection
Close transmission rate；For sjPass through straight-through link transmission data to djThe second target transmission speed
The embodiment of the present invention determines method and the base station of D2D via nodes, wherein, methods described includes：
In Y node in the D2D node preset ranges of distance the first, Y is positive integer, is that repeated link is determined
At least two candidate relay nodes, the transmitting terminal of the repeated link is the first D2D nodes；The mesh of pre-estimation first
Transmission rate is marked, the first object transmission rate is that the first D2D nodes lead directly to chain by the D2D of itself
Road transfers data to the transmission rate during receiving terminal of the repeated link；The candidate relay of pre-estimation at least two
The transmission rate that node is led directly on link in respective D2D, obtains at least two second target transmission speeds；In advance
Estimate the first optimal average transmission rate, the first optimal average transmission rate is the data of the first D2D nodes
The optimal average transmission rate during receiving terminal is forwarded to by least two candidate relay nodes；Pre-estimation
At least two second optimal average transmission rates, the second optimal average transmission rate is each candidate relay section
The partial data of point forward through the first D2D nodes and another part data through itself straight-through link transmission extremely with
Optimal average transmission rate during the information destination node that the candidate relay node matches；According to first object transmission
Speed, at least two second target transmission speeds, the first optimal Mean Speed and at least two second are optimal
Mean Speed, determine at least two candidate relay node whether be the repeated link via node.
The link terminal selected using the present invention, can at least lift the message transmission rate of D2D terminals, meet eventually
The selfishness at end.
Brief description of the drawings
Fig. 1 is the hybrid network schematic diagram in the embodiment of the present invention；
Fig. 2 is the implementation process schematic diagram of the method for determination D2D via nodes in the embodiment of the present invention；
Fig. 3 be the embodiment of the present invention in terminal sk、si、sjTime-frequency resource allocating schematic diagram；
Fig. 4 is the composition structural representation of base station in the embodiment of the present invention；
Fig. 5 (a)~5 (c) is transmitting terminal s in the embodiment of the present invention1Link terminal choosing in motion process
Select situation and the average transmission rate change schematic diagram of other D2D communication links；
Fig. 6 is transmitting terminal s in the embodiment of the present invention1The D2D links s in motion process1→d1Average transmission speed
The contrast schematic diagram of rate and direct-connected transmission rate.
Embodiment
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail, it will be appreciated that following described
Bright preferred embodiment is merely to illustrate and explain the present invention, and is not intended to limit the present invention.
D2D communication links s in hybrid networkt→dt, its transmitting terminal (information source terminal) is st, connect
Receiving end (destination end) is dt, t is positive integer, and t=1,2...N, and the hybrid network is by base station, tradition
Cellular link, N to D2D communication links constitute, each communication link st→dtDirect-connected communication can be used
Mode is transmitted, it would however also be possible to employ trunking traffic mode is transmitted.It is intended in the embodiment of the present invention every
Individual communication link st→dtSelect at least two via nodes, based on it is selected go out via node, set up extremely
Few two D2D repeated links, and by least two D2D repeated links, disclosure satisfy that terminal from
Private, lifts the efficiency of transmission of D2D terminal datas；It is every in network that base station can also be improved simultaneously
The utilization rate of the running time-frequency resource of D2D links distribution.Carried out in this programme so that via node is link terminal as an example
Illustrate.
The method of determination D2D via nodes provided in an embodiment of the present invention, applied in base station, such as Fig. 2 institutes
Show, methods described includes：
Step 201：It is that repeated link is true in the Y node in the D2D node preset ranges of distance the first
Fixed at least two candidate relay nodes, the transmitting terminal of the repeated link is the first D2D nodes；
It is assumed here that in hybrid network, there are N number of communication to st→dt, and t=1,2...N, first
Information source terminal (transmitting terminal) can be s1、s2... or sN, the first destination end (receiving terminal) corresponds to d1、
d2... or dN.Using the first D2D nodes as skAnd the first D2D nodes skThe destination end matched is dk
Exemplified by, skWith dkIt can be carried out data transmission by straight-through link, can also be led to by repeated link
Letter, it is necessary to be possible to by this programme as the relaying in the repeated link before the repeated link is set up
Terminal chooses, and based on it is selected go out link terminal set up from skTo dkRepeated link.Selecting party
Method can be as described below.It should be noted that each D2D terminals in network can be used as a D2D
Node.
In the embodiment of the present invention, exemplified by the quantity of the candidate relay terminal to determine is two, further,
The step 201 is：
Obtain the channel condition information of each node in Y node；
According to the channel condition information of Y node, Y joint transmission speed is obtained；
Maximum combined transmission rate, secondary big joint transmission speed are selected from Y joint transmission speed；
In Y node, it is determined that node corresponding with maximum combined transmission speed, general with time big joint transmission
The corresponding node of rate is the candidate relay node.
Wherein, the channel condition information of each node of the foundation, obtains Y joint transmission speed, including：
When the first D2D nodes are terminal sk, the receiving terminal be terminal dkWhen,
For the node s in Y nodem, m=1,2 ... Y and m ≠ k,
The D2D nodes of pre-estimation the first and the receiving terminal transmit signal to noise ratio during data by tie link, obtain
To the first signal to noise ratio；
According to node smChannel condition information, pre-estimation the first D2D nodes send data via node
smData are from the first D2D node-node transmissions to node s when being forwarded to the receiving terminal of the repeated linkmNoise
Than, from node smTransmit to the signal to noise ratio of the receiving terminal, obtain the second signal to noise ratio, the 3rd signal to noise ratio；
According to the first signal to noise ratio, the second noise when the 3rd signal to noise ratio, joint transmission speed is obtained.
Wherein, for the node s in Y nodem, the signal to noise ratio of foundation first, the second noise when
Three signal to noise ratio, obtaining the process of joint transmission speed can realize according to follow-up formula (1).
Specifically, in communication node skAnd dkNeed to carry out D2D communications, and it is desirable that by relay transmission
During information, transmitting terminal skLink terminal is sent to base station and obtains request, and base station, which is received, comes from transmitting terminal sk's
Link terminal is obtained after request, into network with information source skCentered in circumference 100 meters (preset ranges)
Other D2D transmitting terminals (there are N-1 other D2D transmitting terminals in network) are broadcasted, it is desirable to other
D2D transmitting terminals report respective channel condition information to the base station, it is assumed that apart from skOther of 100 meters of circumference
D2D transmitting terminals are Y, then the base station receives the channel condition information that Y D2D transmitting terminal is reported.Base
Stand the channel condition information reported according to each D2D transmitting terminals, calculate from information source terminal skThe data warp of transmission
Cross smTransmission reaches destination end dkWhen joint transmission speedThe calculation formula of joint transmission speed
It can be obtained according to formula (1)：
Wherein, m=1,2 ... Y and m ≠ k；(the first signal to noise ratio) represents transmitting terminal sk, receiving terminal
dkSignal to noise ratio in tie link transmitting data；(the second signal to noise ratio),(the 3rd signal to noise ratio)
Represent by transmitting terminal skSend data and via terminal smTransmitted after being forwarded to receiving terminal dkWhen transmitting terminal
skTo terminal smSignal to noise ratio, terminal smTo receiving terminal dkSignal to noise ratio；W represents that base station distributes to every
Bandwidth information in the running time-frequency resource of D2D links.Wherein, channel condition information includes any two D2D
The distance between terminal, channel power gain, the noise power of each D2D receiving terminals, each D2D hairs
Transmission power of sending end etc., signal to noise ratio γ is exactly obtained from being calculated according to these channel condition informations, specifically
Calculating process refer to existing related description, this time do not repeat.The preset range can using value as less than
Any positive number equal to 100 meters.
For Y D2D transmitting terminal, according to formula (1), Y joint transmission speed is drawn, and
This Y joint transmission speed is compared to each other, maximum combined transmission rate is obtainedWith it is secondary big
Joint transmission speedAnd determine D2D information source terminals si、sjFor sk→dkThe candidate relay of link is whole
End.Those skilled in the art should and know, the present invention in may it is N number of communication to st→dtIn any one communication
The information source terminal of centering can as other communication to candidate relay terminal.
Step 202：Pre-estimation first object transmission rate, the first object transmission rate is the first D2D
Node leads directly to transmission rate during link transmission data to the receiving terminal by the D2D of itself；
Here, for sk→dkTie link, get s in base stationkChannel condition information after, calculate
Go out skAnd dkSignal to noise ratio when carrying out data transmission on straight-through link(the first signal to noise ratio), and foundation
Formula (2), obtains first object transmission rate
Wherein, WkFor skAnd dkStraight-through link bandwidth.Those skilled in the art should and know,Also it is sk→dk
Direct transmission speed.
Step 203：The transmission speed that the candidate relay terminal of pre-estimation at least two is led directly on link in respective D2D
Rate, obtains at least two second target transmission speeds；
Candidate relay terminal on link, which is led directly to, in respective D2D is used as information source terminal.Herein, still think
sk→dkThe quantity for the candidate relay terminal that link is determined is two, candidate relay terminal is siAnd sjExemplified by,
Because si、sjFor the information source terminal of D2D links, so there are D2D links si→di、sj→dj.In base
Station receives si、sjAfter the channel condition information each reported, to siAnd diIn tie link transmitting data
When signal to noise ratio(the 4th signal to noise ratio) is estimated, to sjAnd djIn tie link transmitting data
Signal to noise ratio(the 4th signal to noise ratio) is estimated, and according to formula (3), (4), obtains si→di's
Direct transmission speed(the second target transmission speed), sj→djDirect transmission speed(the second target
Transmission rate).
Wherein, WiFor siTo diStraight-through link distribution bandwidth, WjFor sjTo djStraight-through link distribution
Bandwidth.In the present invention base station be hybrid network in each of the links, including D2D lead directly to link and relaying chain
Bandwidth value all same, the i.e. W of road distributioni=Wj=Wk=W.
Those skilled in the art should and know, aforementioned formula (2)~formula (4) can be unified with formula (5)
Represent：
Wherein, γa,bRepresent that (D2D information source terminals a) arrives node b (D2D destination ends b) to communication node a
Signal to noise ratio in straight-through link；Wa,bFor the bandwidth of the straight-through link distribution.
It should be noted that step 202 and step 203 can also be entered without strict sequencing simultaneously
OK.
Step 204：The optimal Mean Speed of pre-estimation first, the first optimal Mean Speed is in the first D2D
The data of node are forwarded to the optimal Mean Speed during receiving terminal by least two candidate relay nodes；
Step 205：The optimal Mean Speed of pre-estimation at least two second, the second optimal Mean Speed is
The partial data of each candidate relay node is forwarded through the first D2D nodes and another part data are through itself
Straight-through link transmission reaches the optimal Mean Speed during information destination node matched with the candidate relay node；
In the optimal average transmission rate of pre-estimation first, the optimal average transmission rate of pre-estimation at least two second
Before, methods described also includes：
When the quantity of the second optimal average transmission rate is two,
The first average transmission rate is determined, first average transmission rate is to be sent in the first D2D nodes
Data are forwarded to up to receiving terminal d by two candidate relay nodeskIn the case of average transmission rate；
Two the second average transmission rates are determined, second average transmission rate is each candidate relay node
The partial data of transmission is forwarded by the first D2D nodes and straight-through link of another part data through itself is passed
The average transmission rate transported in the case of the information destination node matched with the candidate relay node；
Determine that the first D2D nodes send data to receiving terminal d via two candidate relay node forwardingskWhen
The quantity of the resource block used, obtains first resource number of blocks；
Determine relaying of the first D2D nodes as each candidate relay node into correspondence information destination node link
Terminal carries out the quantity of used resource block during data forwarding, obtains two Secondary resource numbers of blocks；
According to the first average transmission rate, two the second average transmission rates, first resource number of blocks, two
Secondary resource number of blocks, sets up resource allocator model；
Accordingly, the optimal average transmission rate of the pre-estimation first, pre-estimation at least two second is optimal flat
Equal transmission rate, including：
Resource allocator model is solved, the first best resource blocks quantity, two the second optimal resources are obtained
Number of blocks；
According to the first best resource blocks quantity, two the second best resource blocks quantity, first is obtained optimal average
Transmission rate, two the second optimal average transmission rates.
Specifically,
For step 204 and step 205, calculating the first optimal average transmission rate, second optimal average
Before transmission rate, first pass through equation below (6) and calculate from the first D2D nodes skBy in two candidates
After terminal siAnd sjBe forwarded to up to receiving terminal dkJoint transmission speed
Wherein,For from skThe data sent are by straight-through link to dkWhen signal to noise ratio；Table
Show transmitting terminal skSend data and via terminal siTransmitted after being forwarded to receiving terminal dkWhen transmitting terminal skTo end
Hold siSignal to noise ratio, terminal siTo receiving terminal dkSignal to noise ratio；Represent transmitting terminal skSend number
According to and via terminal sjTransmitted after being forwarded to receiving terminal dkWhen transmitting terminal skTo terminal sjSignal to noise ratio, end
Hold sjTo receiving terminal dkSignal to noise ratio；W represents that base station distributes to every D2D link, is specifically every D2D
The bandwidth information of tie link.
Again by formula (7) by from siBy skBe forwarded to up to diJoint transmission speed
Again by formula (8) by from sjBy skBe forwarded to up to djJoint transmission speed
It can unify to be represented by formula (9) for formula (7) and (8)：
Wherein,For the joint transmission up to communication node b is transformed into by communication node l from communication node a
Speed；γa,bRepresent by leading directly to link from communication node a arrival communication nodes b signal to noise ratio；γa,l、γl,bTable
Communication node a is shown as to be forwarded to up to data during communication node b from node a to node l noise via node l
Than, from node l to node b signal to noise ratio.
On implementing, the first optimal average transmission rate, the second optimal average transmission rate except with it is preceding
The formula (6) stated~formula (8) is relevant, goes back and xk、xiAnd xjOptimal value xk、xiAnd xjIt is relevant.This
Field personnel should and know, the optimal average transmission rate of first in this programme refers to skData pass through two
Individual candidate relay node si、sjIt is forwarded to dkWhen optimal average transmission rate value；Second optimal average transmission
Speed refers to each candidate relay node such as siPartial data through skForward and another part data are through itself
The information destination node such as d that straight-through link transmission extremely matches with the candidate relay nodeiWhen optimal average transmission speed
Rate.
Specifically, as shown in Figure 3, it is assumed that in a cycle that code element information is transmitted, base station is distributed to often
Bar D2D links such as sk→dk、si→di、sj→djQuantity Deng the resource block RB of link is L, for letter
Source terminal skThe frequency of distribution is fk, be candidate relay terminal (information source terminal) siThe frequency of distribution is fi, be
Candidate relay terminal (information source terminal) sjThe frequency of distribution is fj.Direct-connected shown in Fig. 3 is transmitted as by straight
Logical link is transmitted.
For skFor, x is taken out from L resource blockkIndividual resource block (first resource number of blocks) sends
The code element information of oneself, these code element informations will be forwarded to up to receiving terminal d by what is relayedk.And transmitting terminal sk
Take out xjIndividual resource block (Secondary resource number of blocks) is used to assist terminal sjTransmission, take out xiIndividual resource block
(Secondary resource number of blocks) is used to assist terminal siTransmission, so data are from skTransmit to dkWhen (including
By si、sjCarry out forwarding transmission) average transmission rate(the first average transmission rate) such as formula (10)
It is shown：
Wherein,For from skBy two candidate relay terminal siAnd sjReach dkJoint transmission speed
(such as shown in aforementioned formula (6)).
It is corresponding, for siFor, it takes out xkIndividual resource block is used to assist skThe transmission of information, takes out xi
Individual resource block is used to send the code element information of oneself, and being forwarded to up to receiving terminal d by relayingi, it is remaining
Resource block is used to lead directly to the transmission of link, so data are from siTransmit to diWhen (including straight-through link transmission and
By relaying skForwarding transmission) average transmission rate(the second average transmission rate) such as formula (11)
It is shown：
Wherein,For from siBy skReach diJoint transmission speed (such as aforementioned formula (7) shown in)；For si→diDirect transmission speed(such as shown in aforementioned formula (3)).For sjFor, it is taken
Go out xkIndividual resource block is used to assist skThe transmission of information, takes out xjIndividual resource block is used for the code element letter for sending oneself
Breath, and being forwarded to up to receiving terminal d by relayingj, transmission of the remaining resource block for leading directly to link, institute
With data from sjTransmit to djWhen (including straight-through link transmission and by relaying skForwarding transmission) average transmission
Speed(the 3rd average transmission rate) is such as shown in formula (12)：
Wherein,For from sjBy skTo djJoint transmission speed (such as aforementioned formula (8) shown in)；For sj→djDirect transmission speed(such as shown in aforementioned formula (4)).
In figure 3, three big files, in the first file, s can be divided into from time domainkTake out xkIt is individual
Resource block carries out the forwarding transmission of data, siAnd sjAssist skThe forwarding of data is carried out until reaching dk.
In two files, siTake out xiIndividual resource block carries out the forwarding transmission of partial data, skAssist siThis partial data
Forwarding until reach di, and now sjPass through sj→djStraight-through link carries out direct transmission.In the 3rd file,
sjTake out xjIndividual resource block carries out the forwarding transmission of partial data, skAssist sjThe forwarding of this partial data until
Reach dj, and now siPass through si→diStraight-through link carries out direct transmission.I.e. background color identical transmits phase
Same information.
Those skilled in the art should and know, two selected terminal si、sjThere is the information of oneself to need transmission
To corresponding receiving terminal di、dj.Consider the fairness of cooperation, skAt the same time as i-th link and j-th strip
The link terminal of link.It is rich based on cooperation in view of the fairness between the D2D information source terminals cooperated with each other
Principle is played chess, sets up and is based on information source terminal sk, candidate relay terminal siAnd sjBetween resource allocator model (13),
And reasonable distribution is carried out to the running time-frequency resource between partner by the model.
Wherein, model when in second expression formula aforementioned formula (10)~(12) being substituting in model
It is namely based on xk、xiAnd xjThe 3rd expression formula in the model of these three variables, model is constraints,
First expression formula represents the x when Q values are maximumk、xiAnd xjAs xk、xiAnd xjOptimal value xk、
xiAnd xj.In this programme, resource optimal allocation result i.e. of foregoing model is obtained by global optimization approach
One best resource blocks quantity xk, the second best resource blocks quantity xiAnd xj, the specific manifestation of global optimization approach
The calculating process of its optimum allocation result of form refers to related description, does not repeat here.
When obtaining resource optimal allocation result x by foregoing modelk、xiAnd xjAfterwards, then by xk、xiAnd xjPoint
Foregoing formula (10)~(12) are not substituted into, you can obtain in the case of resource block optimum allocation, respectively
Data are obtained from skVia siAnd sjForwarding is transmitted to dkWhen optimal average transmission rate
(the first optimal average transmission rate), from siVia skForwarding and straight-through link transmission are to djWhen it is optimal flat
Equal transmission rate(the second optimal average transmission rate) and data
From sjVia skForwarding and straight-through link transmission are to djWhen optimal average transmission rate(the second optimal average transmission rate).
It should be noted that step 204 and step 205 can also be entered without strict sequencing simultaneously
OK.
Step 206：According to first object transmission rate, at least two second target transmission speeds, first most
Excellent Mean Speed and at least two second optimal Mean Speeds, determine at least two candidate relay node
Whether be repeated link via node；
Step 206 further comprises：Described first optimal Mean Speed and first object transmission rate are carried out
Compare；At least two second optimal Mean Speed is entered with least two second target transmission speed
Row correspondence compares；When the described first optimal Mean Speed is more than first object transmission rate and each second most
When excellent Mean Speed is more than corresponding second target transmission speed, at least two candidate relay node is determined
For the via node of repeated link.
Specifically, base station is respectively compared three cooperation link sk→dk、si→diAnd sj→djIt is optimal it is average pass
The size of defeated speed and direct transmission speed, that is, compareWithSize,WithSize,WithSize, when compare forIt is more thanIt is more thanAndIt is more thanWhen, say
It is bright cooperation transmission in, sk→dk、si→diAnd sj→djThis three cooperation links therefrom obtain certain interests,
In this case candidate relay terminal is ready as sk→dkThe link terminal of link.Base station passes through special control
Channel is to D2D terminals sk、dk、si、di、sj、djCooperation information is sent, is wherein also included in cooperation information
Resource allocation result xk、xiAnd xjAnd the subcarrier of each D2D link is distributed in base station.If can not obtain
ArriveIt is more thanIt is more thanAndIt is more thanComparative result, then base station pass through special control
Channel is to the first D2D nodes skFeedback obtains the response message of request as that " can not get for link terminal
The information of suitable link terminal ", in skWith dkBetween only set up tie link, transmitted by the tie link
Code element information.
In such scheme, L resource block RB of every D2D link is distributed in base station；Wherein same D2D
The different resource block RB of link takes identical subcarrier, different time slots；The resource of different D2D links
Block RB, which takes, uses orthogonal sub-carriers between different subcarriers, i.e., different links, so enter in different links
Row code element information reduces the probability interfered when transmitting.For sk→dkLink, because information source skSend
Subcarrier and link terminal s used in code element informationi、sjSubcarrier used in forwarding information be it is mutually orthogonal,
So link terminal works in mode of frequency division duplexing, the availability of frequency spectrum can be improved.When D2D information source terminals are logical
Cross direct-connected transmission means and when corresponding destination end is communicated, the pattern of time division duplex can be used.
As can be seen here, in the embodiment of the present invention, as communication node skAnd dkNeed carry out D2D communications and
When wishing to transmit information by link terminal, base station distance skOther D2D information source terminals in preset range
Two information source terminals of middle selection are siAnd sjIt is used as D2D links sk→dkLink terminal.Meanwhile, it is selected
Two terminal si、sjThere is the information of oneself to need to be sent to corresponding receiving terminal di、dj.Consider the public affairs of cooperation
Levelling, skAt the same time as i-th link and the link terminal of j-th strip link, pass through reasonable distribution partner
Between running time-frequency resource, be not less than not increasing bandwidth, not increasing transmission power, optimal average transmission rate
On the premise of direct-connected transmission rate, farthest the transmission rate to three cooperation links is optimized.This
Scheme causes chosen link terminal to obtain the increase of transmission rate in cooperation, can effectively meet terminal
Selfishness.In addition, L resource block for distributing to every D2D link in this programme to base station has carried out one
Determine the optimization distribution of degree, and then running time-frequency resource is utilized effectively.
The embodiment of the present invention also provides a kind of base station, as shown in figure 4, the base station includes：First determines
Unit 401, the first pre-estimation unit 402, the second pre-estimation unit 403 and the second determining unit 404；Its
In,
First determining unit 401, in the Y node in the D2D node preset ranges of distance the first,
Y is positive integer, is that repeated link determines at least two candidate relay nodes, the transmitting terminal of the repeated link
For the first D2D nodes；
First pre-estimation unit 402, for pre-estimation first object transmission rate, the first object transmission
Speed is that the first D2D nodes lead directly to link transmission data connecing to the repeated link by the D2D of itself
Transmission rate during receiving end；
And the transmission rate that the candidate relay node of pre-estimation at least two is led directly on link in respective D2D, obtain
To at least two second target transmission speeds；
Second pre-estimation unit 403, for the optimal average transmission rate of pre-estimation first, described first is optimal
Average transmission rate is that the data sent in the first D2D nodes are forwarded by least two candidate relay nodes
Reach the optimal average transmission rate during receiving terminal；
And the optimal average transmission rate of pre-estimation at least two second, the second optimal average transmission rate
Partial data for each candidate relay node is forwarded through the first D2D nodes and another part data are through itself
Optimal average transmission rate during straight-through link transmission to the information destination node matched with the candidate relay node；
Second determining unit 404, for according to first object transmission rate, at least two second object transmissions
Speed, the first optimal Mean Speed and at least two second optimal Mean Speeds, determine described at least two
Candidate relay node whether be repeated link via node.
Wherein, second determining unit 404, is additionally operable to：
Described first optimal Mean Speed and first object transmission rate are compared；
At least two second optimal Mean Speed and at least two second target transmission speed are carried out
Correspondence compares；
When the described first optimal Mean Speed is more than first object transmission rate and each second optimal average speed
When rate is more than corresponding second target transmission speed, determine at least two candidate relay node whether be
After the via node of link.
First determining unit 401, is additionally operable to：
Obtain the channel condition information of each node in Y node；
According to the channel condition information of Y node, Y joint transmission speed is obtained；
The joint transmission speed of maximum, secondary big joint transmission speed are selected from Y joint transmission speed；
In Y terminal, it is determined that node corresponding with maximum joint transmission speed, with secondary big combining biography
The corresponding node of defeated probability is the candidate relay node, and the quantity of the candidate relay node is two.
First determining unit 401, is additionally operable to：
When the first D2D nodes are terminal sk, receiving terminal be terminal dkWhen,
For one of node s in Y nodem, m=1,2 ... Y and m ≠ k,
The D2D nodes of pre-estimation the first and the receiving terminal transmit signal to noise ratio during data by tie link, obtain
To the first signal to noise ratio；
According to node smChannel condition information, pre-estimation the first D2D nodes send data via node
smData are from the first D2D node-node transmissions to node s when being forwarded to the receiving terminalmSignal to noise ratio, from node
smTransmit to the signal to noise ratio of the receiving terminal, obtain the second signal to noise ratio, the 3rd signal to noise ratio；
According to the first signal to noise ratio, the second noise when the 3rd signal to noise ratio, joint transmission speed is obtained.
First determining unit 401, specifically for：
For node sm,
According to formulaObtain sending in the first D2D nodes
Data are via node smIt is forwarded to the joint transmission speed during receiving terminalWherein,For first
Signal to noise ratio,For the second signal to noise ratio,For the 3rd signal to noise ratio, W is link bandwidth.
The first pre-estimation unit 402, is additionally operable to：
When the quantity of the candidate relay node is two,
Obtain the channel condition information of the first D2D nodes；
Obtain the channel condition information of two candidate relay nodes；
According to the channel condition information of the first D2D nodes, the D2D nodes of pre-estimation the first and the receiving terminal
In the signal to noise ratio of tie link transmitting data, the first signal to noise ratio is obtained；
According to the channel condition information of each candidate relay node, determine candidate relay node and with the candidate
After the corresponding information destination node of node in the signal to noise ratio of tie link transmitting data, two the 4th signal to noise ratio are obtained；
According to the first signal to noise ratio, first object transmission rate is obtained；
According to two the 4th signal to noise ratio, two the second target transmission speeds are obtained.
The first pre-estimation unit 402, is additionally operable to：
First signal to noise ratio, two the 4th signal to noise ratio are substituting to respectivelyObtain first
Target transmission speed, two the second target transmission speeds；
Wherein, γ is worked asa,bWhen being expressed as the first signal to noise ratio, WabFor the straight of the first D2D nodes to the receiving terminal
The bandwidth distributed up to link,It is expressed as first object transmission rate；
Work as γa,bWhen representing one of them four signal to noise ratio, WabFor the γa,bCorresponding candidate relay node to this
The bandwidth of the tie link distribution of the information destination node of candidate relay node matching,It is expressed as the second object transmission
Speed.
The base station also includes：First processing units (are not illustrated) in Fig. 4, are used for：
When the quantity of the second optimal average transmission rate is two,
The first average transmission rate is determined, first average transmission rate is to be sent in the first D2D nodes
Data are forwarded to the average transmission rate during receiving terminal by two candidate relay nodes；
Two the second average transmission rates are determined, second average transmission rate is each candidate relay node
The partial data of transmission is forwarded by the first D2D nodes and straight-through link of another part data through itself is passed
The average transmission rate transported in the case of the information destination node matched with the candidate relay node；
Determine that the first D2D nodes send data to the receiving terminal via two candidate relay node forwardings
When the quantity of resource block that uses, obtain first resource number of blocks；
Determine relaying of the first D2D nodes as each candidate relay node into correspondence information destination node link
Node carries out the quantity of used resource block during data forwarding, obtains two Secondary resource numbers of blocks；
According to the first average transmission rate, two the second average transmission rates, first resource number of blocks, two
Secondary resource number of blocks, sets up resource allocator model；
Accordingly, second determining unit 404, is additionally operable to：
Resource allocator model is solved, the first best resource blocks quantity, two the second optimal resources are obtained
Number of blocks；
According to the first best resource blocks quantity, two the second best resource blocks quantity, first is obtained optimal average
Transmission rate, two the second optimal average transmission rates.
Second determining unit 404, is used for：
When the first best resource blocks quantity isTwo the second best resource blocks quantity are xiAnd xjWhen,
By the first best resource blocks quantityIt is substituting toObtain the first optimal average transmission speed
RateWherein, L is the total quantity for the resource block that every D2D link is used,Represent from first
D2D nodes skBy two candidate relay node siAnd sjBe forwarded to up to the receiving terminal dkJoint transmission
Speed；
WillxiIt is substituting toObtain a second optimal average transmission
Speed, wherein,For from siBy skReach and siThe D2D information destination nodes d matchediJoint pass
Defeated speed；For siPass through straight-through link transmission data to diThe second target transmission speed
WillxjIt is substituting toObtain another second optimal average
Transmission rate, wherein,For from sjBy skReach and sjThe D2D information destination nodes d matchedjConnection
Close transmission rate；For sjPass through straight-through link transmission data to djThe second target transmission speed
In actual applications, first determining unit 401, the first pre-estimation unit 402, the second pre-estimation
The determining unit 404 of unit 403 and second can be by CPU (CPU, Central Processing
Unit) or Digital Signal Processing (DSP, Digital Signal Processor) or microprocessor (MPU,
Micro Processor Unit) or field programmable gate array (FPGA, Field Programmable Gate
) etc. Array realize.
It should be noted that base station provided in an embodiment of the present invention, due to its solve the principle of problem with it is foregoing
Determination D2D via nodes method it is similar, therefore, the implementation process and implementation principle of base station can join
See implementation process and the implementation principle description of preceding method, repeat part and repeat no more.
This programme is further understood from reference to herein below.
In the present embodiment, in the hybrid network shown in Fig. 1, worked when terminal is as D2D via nodes
In mode of frequency division duplexing, every D2D link is distributed in base station and cellular link is mutually orthogonal frequency spectrum money
Source.4 D2D communication links (s are set in networki→di, i=1,2,3,4), transmitting terminal s1To base station
The request for obtaining link terminal is sent, base station is apart from transmitting terminal s1Other a range of D2D information sources are whole
Two terminals are chosen in end and are used as s1→d1The candidate relay terminal of link.4 information source terminals in the present embodiment
Coordinate position with 4 destination ends is as shown in table 1,
Table 1
| D2D information source terminals (transmitting terminal) | D2D destination ends (receiving terminal) |
| s1(75, -60≤Y≤60) | d1(175,0) |
| s2(100, -15) | d2(0, -15) |
| s3(115,0) | d3(15,0) |
| s4(100,15) | d4(0,15) |
In the present embodiment, the channel power gain g=0.097/d between regulation any two D2D terminals3.76,
Wherein d represents the distance between two D2D terminals, and other simulation parameters are as shown in table 2：
Table 2
In the present embodiment, fixed D2D transmitting terminals s1Abscissa it is constant, ordinate is with step-length 5 from -60m
60m is changed to, s is obtained1The selection situation of its link terminal and its average transmission rate in motion process
Situation of change.
Fig. 5 (a)~5 (c) is the transmitting terminal s realized using this programme1Link terminal in motion process
The average transmission rate change schematic diagram of selection situation and other D2D communication links.
Work as s1Ordinate -52<Y<When 0, base station is s1Two link terminals selected are s2And s3, s1
With s2、s3Enter the cooperation transmission of row information, the D2D links s in cooperation2→d2Average transmission rate with should
The direct transmission speed of link is compared and increased, the D2D links s in cooperation3→d3Average transmission rate
It increased compared with the direct transmission speed of the link.Work as s1Ordinate 0<Y<When 52, base station is s1
Two link terminals selected are s3And s4, s1、s3And s4Enter the cooperation transmission of row information, in cooperation
D2D links s3→d3Average transmission rate increased compared with the direct transmission speed of the link, close
D2D links s in work4→d4Average transmission rate increased compared with the direct transmission speed of the link.
As can be seen here, in cooperation transmission, the D2D links corresponding to candidate relay terminal being each selected
There is certain increase in average transmission rate, i.e., candidate relay terminal obtains certain interests in cooperation,
In this case candidate relay terminal is ready to take on D2D communication links s1→d1Link terminal.
Fig. 6 is transmitting terminal s in the embodiment of the present invention1The D2D links s in motion process1→d1Average transmission speed
The contrast schematic diagram of rate and direct-connected transmission rate.As shown in fig. 6, working as s1Ordinate -52<Y<When 52, its
Average transmission rate is above direct transmission speed, s1Ordinate -52<Y<It is s when 521Enter with link terminal
The situation of row cooperation transmission, that is to say, that transmitting terminal s1With other two link terminals cooperate transmission when,
Not only the average transmission rate of the D2D communication links by information source terminal of link terminal gets a promotion, D2D
Link s1→d1Average transmission rate also get a promotion, and then can further improve network transmission performance, it is real
Now to the optimization of network transmission performance.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or meter
Calculation machine program product.Therefore, the present invention can using hardware embodiment, software implementation or combine software and
The form of the embodiment of hardware aspect.Moreover, the present invention can be used wherein includes calculating one or more
The computer-usable storage medium of machine usable program code (includes but is not limited to magnetic disk storage and optical storage
Device etc.) on the form of computer program product implemented.
The present invention is with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Flow chart and/or block diagram describe.It should be understood that can be by computer program instructions implementation process figure and/or side
Each flow and/or square frame in block diagram and flow and/or the knot of square frame in flow chart and/or block diagram
Close.Can provide these computer program instructions to all-purpose computer, special-purpose computer, Embedded Processor or
The processor of other programmable data processing devices is to produce a machine so that by computer or other can
The instruction of the computing device of programming data processing equipment is produced for realizing in one flow or multiple of flow chart
The device for the function of being specified in one square frame of flow and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices
In the computer-readable memory worked in a specific way so that be stored in the computer-readable memory
Instruction, which is produced, includes the manufacture of command device, and the command device is realized in one flow of flow chart or multiple streams
The function of being specified in one square frame of journey and/or block diagram or multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices, made
Obtain and perform series of operation steps on computer or other programmable devices to produce computer implemented place
Reason, so that the instruction performed on computer or other programmable devices is provided for realizing in flow chart one
The step of function of being specified in flow or multiple flows and/or one square frame of block diagram or multiple square frames.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the protection model of the present invention
Enclose.
Claims (18)
1. a kind of method of determination D2D via nodes, it is characterised in that methods described includes：
In the Y node in the D2D node preset ranges of distance the first, Y is positive integer, for relaying chain
Road determines at least two candidate relay nodes, and the transmitting terminal of the repeated link is the first D2D nodes；
Pre-estimation first object transmission rate, the first object transmission rate is that the first D2D nodes pass through certainly
The D2D of body lead directly to link transmission data to the repeated link receiving terminal when transmission rate；
The candidate relay node of pre-estimation at least two respective D2D lead directly to link on transmission rate, obtain to
Few two the second target transmission speeds；
The optimal average transmission rate of pre-estimation first, the first optimal average transmission rate is the first D2D nodes
Optimal average transmission rate of data when being forwarded to the receiving terminal by least two candidate relay nodes；
The optimal average transmission rate of pre-estimation at least two second, the second optimal average transmission rate is each
The partial data of candidate relay node is forwarded through the first D2D nodes and another part data are through itself straight-through chain
Transmit to the optimal average transmission rate during information destination node matched with the candidate relay node on road；
According to first object transmission rate, at least two second target transmission speeds, the first optimal Mean Speed
And at least two second optimal Mean Speeds, whether determine at least two candidate relay node is described
The via node of repeated link.
2. according to the method described in claim 1, it is characterised in that the optimal Mean Speed of the foundation first,
At least two second optimal Mean Speeds, first object transmission rate and at least two second object transmissions speed
Rate, determine at least two candidate relay node whether be repeated link via node, including：
Described first optimal Mean Speed and first object transmission rate are compared；
At least two second optimal Mean Speed and at least two second target transmission speed are carried out
Correspondence compares；
When the described first optimal Mean Speed is more than first object transmission rate and each second optimal average speed
When rate is more than corresponding second target transmission speed, in determining that at least two candidate relay node is described
After the via node of link.
3. method according to claim 1 or 2, it is characterised in that described in the D2D of distance the first
In Y node in node preset range, at least two candidate relay nodes in repeated link are determined, are wrapped
Include：
Obtain the channel condition information of each node in Y node；
According to the channel condition information of Y node, Y joint transmission speed is obtained；
The joint transmission speed of maximum, secondary big joint transmission speed are selected from Y joint transmission speed；
In Y node, it is determined that node corresponding with maximum joint transmission speed, with secondary big combining biography
The corresponding node of defeated probability is the candidate relay node, and the quantity of the candidate relay node is two.
4. method according to claim 3, it is characterised in that the channel according to Y node
Status information, obtains Y joint transmission speed, including：
When the first D2D nodes are terminal sk, receiving terminal be terminal dkWhen,
The D2D nodes of pre-estimation the first and receiving terminal transmit signal to noise ratio during data by tie link, obtain the
One signal to noise ratio；
For one of node s in Y nodem, m=1,2 ... Y and m ≠ k,
According to node smChannel condition information, pre-estimation the first D2D nodes send data via node
smData are from the first D2D node-node transmissions to node s when being forwarded to the receiving terminalmSignal to noise ratio, from node
smTransmit to the signal to noise ratio of the receiving terminal, obtain the second signal to noise ratio, the 3rd signal to noise ratio；
According to the first signal to noise ratio, the second noise when the 3rd signal to noise ratio, joint transmission speed is obtained.
5. method according to claim 4, it is characterised in that methods described also includes：
For node sm,
According to formula
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<mi>C</mi>
<mi>R</mi>
</mrow>
</msubsup>
<mo>=</mo>
<msub>
<mi>Wlog</mi>
<mn>2</mn>
</msub>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>+</mo>
<msub>
<mi>&gamma;</mi>
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<msub>
<mi>s</mi>
<mi>k</mi>
</msub>
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<msub>
<mi>d</mi>
<mi>k</mi>
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<mi>s</mi>
<mi>k</mi>
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<mi>m</mi>
</msub>
</mrow>
</msub>
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<msub>
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</msub>
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</msub>
</mrow>
</msub>
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</mfrac>
<mo>)</mo>
</mrow>
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</mrow>
Obtain sending in the first D2D nodes
Joint transmission speed when data are forwarded to the receiving terminal via node sm is first wherein
Signal to noise ratio, is the second signal to noise ratio, is the 3rd signal to noise ratio, and W is link bandwidth.
6. according to the method described in claim 1, it is characterised in that the pre-estimation first object transmission speed
Rate, the candidate relay node of pre-estimation at least two respective D2D lead directly to link on transmission rate, obtain to
Few two the second target transmission speeds, including：
When the quantity of the candidate relay node is two,
Obtain the channel condition information of the first D2D nodes；
Obtain the channel condition information of two candidate relay nodes；
According to the channel condition information of the first D2D nodes, the D2D nodes of pre-estimation the first and the receiving terminal
In the signal to noise ratio of tie link transmitting data, the first signal to noise ratio is obtained；
According to the channel condition information of each candidate relay node, determine candidate relay node and with the candidate
After the corresponding information destination node of node in the signal to noise ratio of tie link transmitting data, two the 4th signal to noise ratio are obtained；
According to the first signal to noise ratio, first object transmission rate is obtained；
According to two the 4th signal to noise ratio, two the second target transmission speeds are obtained.
7. method according to claim 6, it is characterised in that methods described includes：
First signal to noise ratio, two the 4th signal to noise ratio are substituting to respectivelyObtain first
Target transmission speed, two the second target transmission speeds；
Wherein, γ is worked asa,bWhen being expressed as the first signal to noise ratio, WabThe first D2D nodes are expressed as to the receiving terminal
Tie link distribution bandwidth,It is expressed as first object transmission rate；
Work as γa,bWhen representing one of them four signal to noise ratio, WabIt is expressed as the γa,bCorresponding candidate relay node is extremely
The bandwidth of the tie link distribution of the information destination node matched with the candidate relay node,It is expressed as the second target
Transmission rate.
8. according to the method described in claim 1, it is characterised in that the optimal average biography of pre-estimation first
Before defeated speed, the optimal average transmission rate of pre-estimation at least two second, including：
When the quantity of the second optimal average transmission rate is two,
The first average transmission rate is determined, first average transmission rate is to be sent in the first D2D nodes
Data are forwarded to up to the average transmission rate in the case of the receiving terminal by two candidate relay nodes；
Two the second average transmission rates are determined, second average transmission rate is each candidate relay node
The partial data of transmission is forwarded by the first D2D nodes and straight-through link of another part data through itself is passed
Average transmission rate in the case of the information destination node that defeated arrival matches with the candidate relay node；
Determine that the first D2D nodes send data to the receiving terminal via two candidate relay node forwardings
When the quantity of resource block that uses, obtain first resource number of blocks；
Determine relaying of the first D2D nodes as each candidate relay node into correspondence information destination node link
Node carries out the quantity of used resource block during data forwarding, obtains two Secondary resource numbers of blocks；
According to the first average transmission rate, two the second average transmission rates, first resource number of blocks, two
Secondary resource number of blocks, sets up resource allocator model；
Accordingly, the optimal average transmission rate of the pre-estimation first, pre-estimation at least two second is optimal flat
Equal transmission rate, including：
Resource allocator model is solved, the first best resource blocks quantity, two the second optimal resources are obtained
Number of blocks；
According to the first best resource blocks quantity, two the second best resource blocks quantity, first is obtained optimal average
Transmission rate, two the second optimal average transmission rates.
9. method according to claim 8, it is characterised in that the first best resource blocks of foundation number
Amount, two the second best resource blocks quantity, obtain the first optimal average transmission rate, two it is second optimal flat
Equal transmission rate, including：
When the first best resource blocks quantity isTwo the second best resource blocks quantity are xiAnd xjWhen,
By the first best resource blocks quantityIt is substituting toObtain the first optimal average transmission speed
RateWherein, L is the total quantity for the resource block for distributing to every D2D link,Represent from the
One D2D nodes skBy two candidate relay node siAnd sjThe receiving terminal being forwarded to up to the repeated link
Hold dkJoint transmission speed；
WillxiIt is substituting toObtain a second optimal average transmission
Speed, wherein,For from siBy skReach and siThe information destination node d matchediJoint transmission speed；For siPass through straight-through link transmission data to diThe second target transmission speed
WillxjIt is substituting toObtain another second optimal average
Transmission rate, wherein,For from sjBy skReach and sjThe information destination node d matchedjJoint pass
Defeated speed；For sjPass through straight-through link transmission data to djThe second target transmission speed
10. a kind of base station, it is characterised in that the base station includes：
First determining unit, in the Y node in the D2D node preset ranges of distance the first, Y
It is that repeated link determines at least two candidate relay nodes, the transmitting terminal of the repeated link is institute for positive integer
State the first D2D nodes；
First pre-estimation unit, for pre-estimation first object transmission rate, the first object transmission rate
Link transmission data is led directly to the receiving terminal of the repeated link by the D2D of itself for the first D2D nodes
Transmission rate；
And the transmission rate that the candidate relay node of pre-estimation at least two is led directly on link in respective D2D, obtain
To at least two second target transmission speeds；
Second pre-estimation unit, it is optimal average for the optimal average transmission rate of pre-estimation first, described first
Transmission rate is by least two candidate relay nodes to be forwarded to described connect in the data of the first D2D nodes
The optimal average transmission rate of receiving end；
And the optimal average transmission rate of pre-estimation at least two second, the second optimal average transmission rate
The partial data sent for each candidate relay node is forwarded through the first D2D nodes and another part data are passed through
The optimal average transmission of itself straight-through link transmission to the information destination node matched with the candidate relay node is fast
Rate；
Second determining unit, for according to first object transmission rate, at least two second target transmission speeds,
First optimal Mean Speed and at least two second optimal Mean Speeds, are determined at least two candidate
After node whether be repeated link via node.
11. base station according to claim 10, it is characterised in that second determining unit, is also used
In：
Described first optimal Mean Speed and first object transmission rate are compared；
At least two second optimal Mean Speed and at least two second target transmission speed are carried out
Correspondence compares；
When the described first optimal Mean Speed is more than first object transmission rate and each second optimal average speed
When rate is more than corresponding second target transmission speed, in determining that at least two candidate relay node is described
After the via node of link.
12. the base station according to claim 10 or 11, it is characterised in that first determining unit,
It is additionally operable to：
Obtain the channel condition information of each node in Y node；
According to the channel condition information of Y node, Y joint transmission speed is obtained；
The joint transmission speed of maximum, secondary big joint transmission speed are selected from Y joint transmission speed；
In Y node, it is determined that node corresponding with maximum joint transmission speed, with secondary big combining biography
The corresponding node of defeated probability is the candidate relay node, and the quantity of the candidate relay node is two.
13. base station according to claim 12, it is characterised in that first determining unit, is also used
In：
When the first D2D nodes are terminal sk, the receiving terminal be terminal dkWhen,
The D2D nodes of pre-estimation the first and the receiving terminal transmit signal to noise ratio during data by tie link, obtain
To the first signal to noise ratio；
For one of node s in Y nodem, m=1,2 ... Y and m ≠ k,
According to node smChannel condition information, pre-estimation the first D2D nodes send data via node
smData are from the first D2D node-node transmissions to node s when being forwarded to the receiving terminalmSignal to noise ratio, from node
smTransmit to the signal to noise ratio of the receiving terminal, obtain the second signal to noise ratio, the 3rd signal to noise ratio；
According to the first signal to noise ratio, the second noise when the 3rd signal to noise ratio, joint transmission speed is obtained.
14. base station according to claim 13, it is characterised in that first determining unit, is also used
In：
For node sm,
According to formula
<mrow>
<msubsup>
<mi>R</mi>
<mrow>
<msub>
<mi>s</mi>
<mi>k</mi>
</msub>
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<mi>m</mi>
</msub>
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<mi>d</mi>
<mi>k</mi>
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<mi>C</mi>
<mi>R</mi>
</mrow>
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<msub>
<mi>Wlog</mi>
<mn>2</mn>
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<mi>k</mi>
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<msub>
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<mi>k</mi>
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<mi>m</mi>
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<mi>k</mi>
</msub>
</mrow>
</msub>
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<mrow>
<mn>1</mn>
<mo>+</mo>
<msub>
<mi>&gamma;</mi>
<mrow>
<msub>
<mi>s</mi>
<mi>k</mi>
</msub>
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<msub>
<mi>s</mi>
<mi>m</mi>
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<mi>&gamma;</mi>
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<mi>s</mi>
<mi>m</mi>
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<mi>d</mi>
<mi>k</mi>
</msub>
</mrow>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>,</mo>
</mrow>
Obtain sending in the first D2D nodes
Joint transmission speed when data are forwarded to the receiving terminal via node sm is first wherein
Signal to noise ratio, is the second signal to noise ratio, is the 3rd signal to noise ratio, and W is link bandwidth. 6
15. base station according to claim 10, it is characterised in that the first pre-estimation unit, also
For：
When the quantity of the candidate relay node is two,
Obtain the channel condition information of the first D2D nodes；
Obtain the channel condition information of two candidate relay nodes；
According to the channel condition information of the first D2D nodes, the D2D nodes of pre-estimation the first and the receiving terminal
In the signal to noise ratio of tie link transmitting data, the first signal to noise ratio is obtained；
According to the channel condition information of each candidate relay node, determine candidate relay node and with the candidate
After the corresponding information destination node of node in the signal to noise ratio of tie link transmitting data, two the 4th signal to noise ratio are obtained；
According to the first signal to noise ratio, first object transmission rate is obtained；
According to two the 4th signal to noise ratio, two the second target transmission speeds are obtained.
16. base station according to claim 15, it is characterised in that the first pre-estimation unit, also
For：
First signal to noise ratio, two the 4th signal to noise ratio are substituting to respectivelyObtain first
Target transmission speed, two the second target transmission speeds；
Wherein, γ is worked asa,bWhen being expressed as the first signal to noise ratio, WabFor the straight of the first D2D nodes to the receiving terminal
The bandwidth distributed up to link,It is expressed as first object transmission rate；
Work as γa,bWhen representing one of them four signal to noise ratio, WabFor the γa,bCorresponding candidate relay node to this
The bandwidth of the tie link distribution of the information destination node of candidate relay node matching,It is expressed as the second object transmission
Speed.
17. base station according to claim 10, it is characterised in that the base station also includes：
First processing units, for when the second optimal average transmission rate quantity be two when,
The first average transmission rate is determined, first average transmission rate is to be sent in the first D2D nodes
Data are forwarded to up to the average transmission rate in the case of the receiving terminal by two candidate relay nodes；
Two the second average transmission rates are determined, second average transmission rate is each candidate relay node
The partial data of transmission is forwarded by the first D2D nodes and straight-through link of another part data through itself is passed
Average transmission rate in the case of the information destination node that defeated arrival matches with the candidate relay node；
Determine that the first D2D nodes send data to the receiving terminal via two candidate relay node forwardings
When the quantity of resource block that uses, obtain first resource number of blocks；
Determine relaying of the first D2D nodes as each candidate relay node into correspondence information destination node link
Node carries out the quantity of used resource block during data forwarding, obtains two Secondary resource numbers of blocks；
According to the first average transmission rate, two the second average transmission rates, first resource number of blocks, two
Secondary resource number of blocks, sets up resource allocator model；
Accordingly, second determining unit, is additionally operable to：
Resource allocator model is solved, the first best resource blocks quantity, two the second optimal resources are obtained
Number of blocks；
According to the first best resource blocks quantity, two the second best resource blocks quantity, first is obtained optimal average
Transmission rate, two the second optimal average transmission rates.
18. base station according to claim 17, it is characterised in that second determining unit, is used for：
When the first best resource blocks quantity isTwo the second best resource blocks quantity are xiAnd xjWhen,
By the first best resource blocks quantityIt is substituting toObtain the first optimal average transmission speed
RateWherein, L is the total quantity for the resource block that every D2D link is used,Represent from first
D2D nodes skBy two candidate relay node siAnd sjBe forwarded to up to the receiving terminal dkJoint transmission
Speed；
WillxiIt is substituting toObtain a second optimal average transmission
Speed, wherein,For from siBy skReach and siThe D2D information destination nodes d matchediJoint pass
Defeated speed；For siPass through straight-through link transmission data to diThe second target transmission speed
WillxjIt is substituting toObtain another second optimal average
Transmission rate, wherein,For from sjBy skReach and sjThe D2D information destination nodes d matchedjConnection
Close transmission rate；For sjPass through straight-through link transmission data to djThe second target transmission speed
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| CN108337714A (en) * | 2018-03-19 | 2018-07-27 | 江苏科技大学 | The energy saving transfer path selection method that user terminal is relayed based on D2D in heterogeneous network |
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| CN110139337A (en) * | 2018-02-09 | 2019-08-16 | 电信科学技术研究院有限公司 | A kind of selection method and equipment of relay node |
| WO2020010797A1 (en) * | 2018-07-13 | 2020-01-16 | 中兴通讯股份有限公司 | Transmission rate determining method and apparatus, transmission device, and storage medium |
| WO2020119598A1 (en) * | 2018-12-13 | 2020-06-18 | 索尼公司 | Electronic device, wireless communication method, and computer readable medium |
| WO2022095581A1 (en) * | 2020-11-04 | 2022-05-12 | 荣耀终端有限公司 | Data transmission method and terminal device |
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| US11310717B2 (en) | 2018-02-09 | 2022-04-19 | Datang Mobile Communications Equipment Co., Ltd. | Relay node selection method and device |
| CN108337714B (en) * | 2018-03-19 | 2019-10-29 | 江苏科技大学 | The energy saving transfer path selection method that user terminal is relayed based on D2D in heterogeneous network |
| CN108337714A (en) * | 2018-03-19 | 2018-07-27 | 江苏科技大学 | The energy saving transfer path selection method that user terminal is relayed based on D2D in heterogeneous network |
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| WO2020010797A1 (en) * | 2018-07-13 | 2020-01-16 | 中兴通讯股份有限公司 | Transmission rate determining method and apparatus, transmission device, and storage medium |
| CN110719138A (en) * | 2018-07-13 | 2020-01-21 | 中兴通讯股份有限公司 | Transmission rate determining method, device, transmission equipment and storage medium |
| CN110719138B (en) * | 2018-07-13 | 2022-04-01 | 中兴通讯股份有限公司 | Transmission rate determining method, device, transmission equipment and storage medium |
| US11350368B2 (en) | 2018-07-13 | 2022-05-31 | Zte Corporation | Method for determinating transmission rate and apparatus, transmission device, and storage medium |
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