CN104023368B - A kind of Turbo Detection for Cooperative Communication relay selection method based on node type and position - Google Patents
A kind of Turbo Detection for Cooperative Communication relay selection method based on node type and position Download PDFInfo
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Abstract
The invention discloses a kind of Turbo Detection for Cooperative Communication relay selection method based on node type and position.Methods described includes：Via node type is divided into into relay base station and trunk subscriber equipment；Make following differentiation in via node position：(1) relay base station is divided into into border relay base station, multiple barrier relay base station and common relay base station；(2) trunk subscriber equipment is divided into into border trunk subscriber equipment, multiple barrier trunk subscriber equipment and common trunk subscriber equipment；Candidate relay node is selected, candidate relay node set is constituted；Via node is selected among candidate relay node set.The present invention simultaneously considers node type and position in trunk node selection, and has taken into account the reality factors such as channel status, service delay, signaling consumption, with practical, motility it is good the characteristics of, possess good relay selection performance.
Description
Technical field
The present invention relates to mobile communication technology field, and in particular to a kind of communication for coordination system based on node type and position
System relay selection method.
Background technology
In recent years, the communication for coordination that source node carries out data transmission is aided in obtain greatly concern by via node,
Wherein, relay selection is one of key factor that communication for coordination can obtain more dominance energy.
The basic skills of relay selection is that best relay selects (BRS:Best Relay Selection) method, BRS from
Best relay is selected in via node to be selected, the data for receiving is forwarded at via node, its foundation for selecting
It is that channel measurement is carried out to every repeated link, judges which relaying possesses most strong road in forwarding information according to measurement
Footpath.Additionally, also having based on the relay selection strategy of outage probability, based on the relay selection probability of bit error rate, based on power point
Relay selection matched somebody with somebody etc..
In Turbo Detection for Cooperative Communication, the type of via node is various, can both be that base station, or user set
Standby, different types of via node differs from one another, and relay capabilities there is also difference.With regard to base station and user equipment comparatively, base
The disposal ability stood is far above user equipment, and base station can be powered using power supply, and mobile subscriber equipment is then battery confession
Electricity, stand-by time are shorter, and mobile subscriber equipment has mobility, large number of, in each position of cell.Therefore, in
On select permeability, the selection strategy of difference should be taken for different via node types.Meanwhile, research shows, relaying
The performance of selection is closely associated with the position presence of via node, therefore the position residing for via node is considered in relay selection
Put and be very important.
The content of the invention
Based on considerations above, the present invention proposes a kind of Turbo Detection for Cooperative Communication based on via node type and position and relays
System of selection, the method may also adapt to difference in addition to making corresponding relay selection for via node type and position
The change of channel type, with wide applicability and considerable flexibility.
The present invention has carried out the classification of science according to the type of via node and position to via node, there is provided Yi Zhongji
In the Turbo Detection for Cooperative Communication relay selection method of node type and position, and the mobile communications network in future is exactly with multiple types
The network of type node.
The present invention band efficiency and outage probability by mobile collaboration communication system under various Mobile Fading Channels point
It is not unified in a mathematic(al) representation, by setting up channel statistic such as Rice factor being mapped in Mobile Fading Channels
Channel status this key factor is taken into full account in the selection of via node, with being well adapted for property and motility, has been possessed
Good relay selection performance.
The present invention takes into full account the reality factors such as balancing the load, service delay, link circuit self-adapting in relay selection process,
Be conducive to important resource distribution effect is played in practical commercial operation.
Technical scheme is set forth below.
A kind of Turbo Detection for Cooperative Communication relay selection method based on node type and position, including：
Via node type is divided into into relay base station and trunk subscriber equipment；
Make following differentiation in via node position：(1) relay base station is divided into into border relay base station, multiple barrier relay base station
With common relay base station, wherein multiple barrier relay base station is defined as in the distance with three or more than three cell base stations, and two
Two are less than multiple barrier distance threshold Δ apart from its differencemdRelay base station；Border relay base station is defined as and two cell base stations
Frontier distance threshold delta is less than apart from its differenceddNon- multiple barrier relay base station relay base station；Common relay base station is defined as removing
Relay base station outside border relay base station and multiple barrier relay base station；(2) trunk subscriber equipment is divided into border relaying to use
Family equipment, multiple barrier trunk subscriber equipment and common trunk subscriber equipment, wherein, multiple barrier trunk subscriber device definition is reception
To three or more than three most strong cell reference signals in, two-by-two the difference of reference signal strength be less than multiple barrier signalc threshold
ΩmsTrunk subscriber equipment；Border trunk subscriber device definition be the most strong cell reference signals of two for receiving intensity it
Difference is less than sideband signal thresholding ΩdsNon- multiple barrier trunk subscriber equipment trunk subscriber equipment；Common trunk subscriber equipment is fixed
Justice is the trunk subscriber equipment in addition to border trunk subscriber equipment and multiple barrier trunk subscriber equipment；
Candidate relay node is selected, candidate relay node set is constituted；
Via node is selected among candidate relay node set.
Specific embodiment
More detailed description is made with reference to embodiment, contributes to understanding the present invention and application effect.
In the present invention, according to the difference of via node type, via node is divided into into relay base station (referred to as relaying BS：
Relay Base Station) and trunk subscriber equipment (referred to as relaying UE：Relay User Equipment) two classes, while root
According to relaying BS and the difference of relaying UE locations, further area is carried out to relay base station and trunk subscriber equipment
Point：
(1) relaying BS is divided into into border relaying BS, multiple barrier relaying BS and commonly relays BS, wherein multiple barrier relaying BS
Be defined as in the distance with three or more than three cell base stations, multiple barrier distance threshold Δ is less than apart from its difference two-by-twomd's
Relaying BS；Border relaying BS is defined as being less than frontier distance threshold delta with the difference of the distance of two cell base stationsddNon- multiple barrier
The relaying BS of relaying BS；Common relaying BS is the relaying BS in addition to border relays BS and multiple barrier relaying BS.
(2) relaying UE is divided into into border relaying UE, multiple barrier relaying UE and commonly relays UE, wherein, multiple barrier relaying
UE is defined as in three for receiving or more than three most strong cell reference signals, and the difference of reference signal strength is less than more two-by-two
Sideband signal thresholding ΩmsRelaying UE；Border relaying UE be defined as the intensity of two most strong cell reference signals that receives it
Difference is less than sideband signal thresholding ΩdsNon- multiple barrier relay the relaying UE of UE；Common relaying UE is to relay UE and polygon except border
Relaying UE outside boundary relaying UE.
For the ease of distinguishing, our different phases according to relay selection, mesh before candidate relay node set is formed
The relaying BS that arrives of nodal test and relaying UE be referred to as relaying BS to be selected and relaying UE to be selected, be selected into candidate relay node set
Relaying BS to be selected and relaying UE to be selected is referred to as candidate relay BS and candidate relay UE.
It is as cell border areas are jitters, disturb multiple normal areas, for same type via node, first
Common via node is first selected as via node, is secondly selected border via node as via node, is finally considered polygon
Boundary's via node is used as via node.
There is caching little, battery powered, disposal ability is weak etc. factor due to relaying UE, be not suitable for carrying out two-forty, it is long when
Between business transmission；Therefore, relay UE and be only used for real time business such as voice service when relaying BS is busy to low rate
Etc. being relayed；Or do not relay when BS is able to carry out relay task at that time using relaying UE relayed.Simultaneously, it is considered to
The restriction being subject to communicating between relaying UE and destination node is more, should not carry out substantial amounts of signalling, preferably using at a slow speed
Link circuit self-adapting or fixed-rate transmission.
When via node meets following condition for the moment, it is believed that the via node is in " busy " state：
(1) the occupied percentage ratio of the cache resources of node reaches more than α % (70≤α≤100) (% containing α)；
(2) load of node reaches more than δ % (70≤δ≤100) (% containing δ).
When the load of via node is at ε % (0≤ε≤30) (% containing ε) below, it is believed that the via node is in " free time "
State.
The specific targets for weighing certain moment node load can be the moment node transmitting power and node emission maximum work(
The ratio of rate；It can also be the ratio of the occupied number of channel of moment node and node maximum available channel number；Or the moment node
Take ratio of resource and node maximum available resources etc..
Relaying BS to be selected, candidate relay BS in " busy " state, relaying UE to be selected, candidate relay UE are accordingly referred to as treating
Select busy relaying BS, the busy relaying BS of candidate, busy relaying UE to be selected, the busy relaying UE of candidate；In treating for " free time " state
Choose and be accordingly referred to as idle relay BS to be selected, candidate's idle relay after BS, candidate relay BS, relaying UE to be selected, candidate relay UE
BS, idle relay UE to be selected, candidate's idle relay UE.
On the basis of the above, relay selection method of the present invention includes two key steps：
(1) candidate relay node is selected, constitutes candidate relay node set.
First, the ginseng from each relaying BS to be selected and relaying UE to be selected for having the destination node measurement that relaying is required to receive
Signal is examined, for each relaying BS or to be selected relaying UE to be selected, procedure below is performed：
(1) signal to noise ratio for obtaining relaying BS or to be selected relayings UE to the destination node link to be selected by survey calculation is average
ValueAccording to formula：
It is calculated the relaying BS or to be selected relayings UE to be selected and interrupts thresholding γ to the signal to noise ratio of destination node linkο, when
The signal to noise ratio of signal interrupts thresholding γ less than signal to noise ratioοWhen, communication link will occur to interrupt, wherein
(2) according to formula：
The relaying BS or to be selected relayings UE to be selected is calculated to the outage probability P of destination node linkoutAnd efficiency of transmission
η。
Secondly, each relaying BS to be selected and relaying UE to be selected is obtained to the outage probability and efficiency of transmission of destination node link
Afterwards, by outage probability less than or equal to interruption thresholding ΓoutageAnd efficiency of transmission is more than or equal to efficiency of transmission threshold deltaeffTreat
Choose candidate relay node set is included after BS or to be selected relaying UE.
Wherein, how the Rice factor κ for being obtained according to survey calculation (obtains the existing implementation method of value of Rice factor, originally
Invention is not done and is specified) value, formula 1., 2., 3. in parameter N, αi、βi、Expression formula be divided into scenario described below：
(1) work as Rice factorWhen, judge that channel is Rice channel, now N is the integer more than or equal to 1,β i=i,
(2) work as Rice factorWhen, judge that channel is Rayleigh channel, now N=1,β1=1,
In addition it is also possible to adopt other channels such as K channels, KGChannel, η-μ channels, Nakagami channels etc., now parameter
N、αi、βi、With different expression formulas, thus it can also be seen that, the inventive method has considerable flexibility.
(2) via node is selected from candidate relay node set.
Generally, the order that one or more via nodes are chosen from candidate relay node set is followed successively by：Wait
The idle common relay base station of choosing, candidate's free time border relay base station, candidate's free time multiple barrier relay base station, candidate commonly relay base
Stand, boundary candidate relay base station, candidate's multiple barrier relay base station, the busy border relaying of the busy common relay base station of candidate, candidate
Base station, the busy multiple barrier relay base station of candidate, the idle common trunk subscriber equipment of candidate, candidate's free time border trunk subscriber set
The idle multiple barrier trunk subscriber equipment of standby, candidate, the common trunk subscriber equipment of candidate, boundary candidate trunk subscriber equipment, candidate
Multiple barrier trunk subscriber equipment, the busy common trunk subscriber equipment of candidate, the busy border trunk subscriber equipment of candidate, candidate are busy
Multiple barrier trunk subscriber equipment.I.e. when there is candidate's free time commonly relaying BS in candidate relay node set, preferred candidate is empty
Not busy common relaying BS is via node, when the idle common relaying BS of candidate do not exist and in the presence of the relaying BS of candidate free time border,
Candidate free time border relaying BS is selected to be via node, the like.
When there is the busy common relaying BS of for example multiple candidates of multiple same type nodes in candidate relay node set, due to
Actual communication system has limited data buffer storage length, can accommodate L packet, be grouped into up to and service process all obey
Poisson distribution, intensity are respectively λ, μ, and as μ ＞ λ, average queuing delay is 0, and as μ ＜ λ, average queuing delay is more than 0, row
There are several packets in team's queue.In this case, selected according to order from small to large according to packet queue queue length
Select via node.
Distinguishingly, when candidate relay BS is all in " busy " state, for the real time business such as speech of low rate
Business, the order that one or more via nodes are chosen from candidate relay node set are followed successively by：The idle common relaying of candidate
User equipment, candidate's free time border trunk subscriber equipment, candidate's free time multiple barrier trunk subscriber equipment, the common trunk subscriber of candidate
Equipment, boundary candidate trunk subscriber equipment, candidate's multiple barrier trunk subscriber equipment, the busy common relay base station of candidate, Hou Xuanfan
Busy border relay base station, the busy multiple barrier relay base station of candidate, the busy common trunk subscriber equipment of candidate, in the busy border of candidate
After user equipment, the busy multiple barrier trunk subscriber equipment of candidate.It is i.e. idle common when there is candidate in candidate relay node set
During relaying UE, the idle common relaying UE of preferred candidate is via node, when the idle common relaying UE of candidate is not present and candidate is empty
In the presence of not busy border relaying UE, candidate free time border relaying UE is selected to be via node, the like.
Embodiment is given below to illustrate the application effect of the present invention.
(1) candidate relay node is selected, constitutes candidate relay node set.
Following relaying BS to be selected is obtained by survey calculation, its parameter includes average signal-to-noise ratio(dB), Rice factor κ,
Difference d (m) of the distance of node load LOAD, relaying BS to be selected and two base stations, relaying to be selected BS and three or more than three bases
Stand two-by-two apart from the maximum D (m) in its difference：
BS1:κ1=0.5, LOAD1=80%, d1=65, D1=123；
BS2:κ2=0.5, LOAD2=12%, d2=288, D2=234；
BS3:κ3=0.5, LOAD3=60%, d3=134, D3=153；
BS4：κ4=1, LOAD4=13%, d4=22, D4=167；
BS5：κ5=0.5, LOAD5=55%, d5=15, D5=251；
BS6：κ6=1, LOAD6=75%, d6=44, D6=23；
BS7：κ7=0.5, LOAD7=10%, d7=53, D7=46；
BS8：κ8=0.5, LOAD8=61%, d8=10, D8=42；
BS9：κ9=3, LOAD9=91%, d9=233, D9=422；
BS10：κ10=3, LOAD10=64%, d10=532, D10=153；
BS11：κ11=3, LOAD11=78%, d11=231, D11=222；
BS12：κ12=3, LOAD12=10%, d12=421, D12=312；
BS13：κ13=3, LOAD13=48, d13=23, D13=311；
BS14：κ14=3, LOAD14=88%, d14=22, D14=12；
BS15：κ15=3, LOAD15=10%, d15=45, D15=315；
BS16：κ16=3, LOAD16=57%, d16=236, D16=312；
BS17：κ17=3, LOAD17=18%, d17=26, D17=39；
BS18：κ18=6, LOAD18=18%, d18=234, D18=422；
BS19：κ19=6, LOAD19=55%, d19=59, D19=52；
BS20：κ20=6, LOAD20=88%, d20=80, D20=321.
Following relaying UE to be selected is obtained by survey calculation, its parameter includes average signal-to-noise ratioRice factor
Difference u (dbm) of the intensity of two most strong cell reference signals that κ, node load LOAD, relaying UE to be selected are received, wait to choose
The maximum U in the difference of reference signal strength two-by-two in three or more than the three most strong cell reference signals that UE is received
(dBm)：
UE1:κ1=0.5, LOAD1=80%, u1=14, U1=55；
UE2:κ2=0.5, LOAD2=12%, u2=71, U2=90；
UE3:κ3=0.5, LOAD3=60%, u3=34, U3=55；
UE4：κ4=1, LOAD4=13%, u4=9, U4=35；
UE5：κ5=0.5, LOAD5=55%, u5=5, U5=25；
UE6：κ6=1, LOAD6=75%, u6=13, U6=8；
UE7：κ7=0.5, LOAD7=10%, u7=19, U7=12；
UE8：κ8=0.5, LOAD8=61%, u8=3, U8=9；
UE9：κ9=3, LOAD9=91%, u9=51, U9=47；
UE10：κ10=3, LOAD10=64%, u10=79, U10=31；
UE11：κ11=3, LOAD11=78%, u11=66, U11=23；
UE12：κ12=3, LOAD12=10%, u12=40, U12=69；
UE13：κ13=3, LOAD13=48, u13=8, U13=74；
UE14：κ14=3, LOAD14=88%, u14=18, U14=2；
UE15：κ15=3, LOAD15=10%, u15=7, U15=22；
UE16：κ16=3, LOAD16=57%, u16=51, U16=89；
UE17：κ17=3, LOAD17=18%, u17=14, U17=2；
UE18：κ18=6, LOAD18=18%, u18=82, U18=33；
UE19：κ19=6, LOAD19=55%, u19=6, U19=2；
UE20：κ20=6, LOAD20=88%, u20=15, U20=52.
Relaying BS is divided into into border relaying BS, multiple barrier relaying BS and BS is commonly relayed, Δ is setdd=100, Δmd=
100, δ=70, ε=30, the definition of BS, multiple barrier relaying BS and common relaying BS is relayed according to border:
Free time to be selected, the common BS that relays was：BS2、BS12、BS18；
Idle border to be selected relays BS：BS4、BS15；
Idle multiple barrier to be selected relays BS：BS7、BS17；
Common relaying BS to be selected is：BS3、BS10、BS16；
Border to be selected relays BS：BS5、BS13；
Multiple barrier to be selected relays BS:BS19、BS8；
Busy common relaying BS to be selected is：BS11、BS9；
Busy border to be selected relays BS：BS1、BS20；
Busy multiple barrier to be selected relays BS：BS6、BS14.
Relaying UE is divided into into border relaying UE, multiple barrier relaying UE and UE is commonly relayed, Ω is setds=20, Ωms=
20, δ=70, ε=30, the definition of UE, multiple barrier relaying UE and common relaying UE is relayed according to border:
Free time to be selected, the common UE that relays was：UE2、UE12、UE18；
Idle border to be selected relays UE：UE4、UE15；
Idle multiple barrier to be selected relays UE：UE7、UE17；
Common relaying UE to be selected is：UE3、UE10、UE6；
Border to be selected relays UE：UE5、UE13；
Multiple barrier to be selected relays UE:UE19、UE8；
It is to be selected it is busy it is common relaying be：UE11、UE9；
Busy border to be selected relays UE：UE1、UE20；
Busy multiple barrier to be selected relays UE：UE6、UE14.
Arrange1., 2., 3. each relaying BS to be selected is calculated to the outage probability of destination node link according to formula
It is as follows with efficiency of transmission：
BS1：Pout1=7.4%, η1=2.9787；
BS2：Pout2=7.4%, η2=2.9787；
BS3：Pout3=7.4%, η3=2.9787；
BS4：Pout4=2.77%, η4=4.3474；
BS5：Pout5=2.77%, η5=4.3474；
BS6：Pout6=1.81%, η6=4.4819；
BS7：Pout7=0.9%, η7=4.8450；
BS8：Pout8=0.19%, η8=3.1435；
BS9：Pout9=2.22%, η9=3.1950；
BS10：Pout10=2.22%, η10=3.1950；
BS11：Pout11=0.65%, η11=3.1950；
BS12：Pout12=0.36%, η12=5.4784；
BS13：Pout13=0.36%, η13=5.4784；
BS14：Pout14=0.12%, η14=7.0525；
BS15：Pout15=0.12%, η15=7.0525；
BS16：Pout16=0.12%, η16=7.0525；
BS17：Pout17=0.009%, η17=8.5743；
BS18：Pout18=0.49%, η18=3.2178；
BS19：Pout19=0.05%, η19=5.4096；
BS20：Pout20=0.01%, η20=7.0651.
1., 2., 3. each relaying UE to be selected is calculated to the outage probability of destination node link and transmission effect according to formula
Rate is as follows：
UE1：Pout1=7.4%, η1=2.9787；
UE2：Pout2=7.4%, η2=2.9787；
UE3：Pout3=7.4%, η3=2.9787；
UE4：Pout4=2.77%, η4=4.3474；
UE5：Pout5=2.77%, η5=4.3474；
UE6：Pout6=1.81%, η6=4.4819；
UE7：Pout7=0.9%, η7=4.8450；
UE8：Pout8=0.19%, η8=3.1435；
UE9：Pout9=2.22%, η9=3.1950；
UE10：Pout10=2.22%, η10=3.1950；
UE11：Pout11=0.65%, η11=3.1950；
UE12：Pout12=0.36%, η12=5.4784；
UE13：Pout13=0.36%, η13=5.4784；
UE14：Pout14=0.12%, η14=7.0525；
UE15：Pout15=0.12%, η15=7.0525；
UE16：Pout16=0.12%, η16=7.0525；
UE17：Pout17=0.009%, η17=8.5743；
UE18：Pout18=0.49%, η18=3.2178；
UE19：Pout19=0.05%, η19=5.4096；
UE20：Pout20=0.01%, η20=7.0651.
Γ is setoutage=1%, Δeff=4.5, by Pout≤ΓoutageAnd η >=ΔeffVia node to be selected be selected into time
Set of relay nodes is selected, becomes candidate relay node.
Qualified candidate relay BS node is：
The idle common relaying BS of candidate：BS12、BS18；
Candidate free time border relaying BS：BS15；
Candidate free time multiple barrier relaying BS：BS7、BS17；
Candidate commonly relays BS：BS16；
Boundary candidate relays BS：BS13；
Candidate's multiple barrier relays BS：BS19；
The busy common relaying BS of candidate：BS11；
The busy border of candidate relays BS：BS20；
The busy multiple barrier of candidate relays BS：BS14.
Qualified candidate relay UE node is：
The idle common relaying UE of candidate：UE12、UE18；
Candidate free time border relaying UE：UE15；
Candidate free time multiple barrier relaying UE：UE7、UE17；
Candidate commonly relays UE：UE16；
Boundary candidate relays UE：UE13；
Candidate's multiple barrier relays UE：UE19；
The busy common relaying UE of candidate：UE11；
The busy border of candidate relays UE：UE20；
The busy multiple barrier of candidate relays UE：UE14.
(2) via node is selected from candidate relay node set.
The order that one or more via nodes are chosen from candidate relay node set is followed successively by：During candidate's free time is common
After BS：BS12、BS18；Candidate free time border relaying BS：BS15；Candidate free time multiple barrier relaying BS：BS7、BS17；Candidate is common
Relaying BS：BS16；Boundary candidate relays BS:BS13；Candidate's multiple barrier relays BS:BS19；The busy common relaying BS of candidate:
BS11；The busy border of candidate relays BS：BS20；The busy multiple barrier of candidate relays BS：BS14；The idle common relaying UE of candidate：
UE12、UE18；Candidate free time border relaying UE：UE15；Candidate free time multiple barrier relaying UE：UE7、UE17；Candidate commonly relays
UE：UE16；Boundary candidate relays UE:UE13；Candidate's multiple barrier relays UE:UE19；The busy common relaying UE of candidate:UE11；Wait
Select busy border relaying UE：UE20；The busy multiple barrier of candidate relays UE：UE14.
Therefore, if selecting single via node, selection BS12 is via node；If choosing three via nodes,
BS12, BS18, BS15 is then selected to be via node.
Claims (2)
1. a kind of Turbo Detection for Cooperative Communication relay selection method based on node type and position, including：
Via node type is divided into into relay base station and trunk subscriber equipment；
Make following differentiation in via node position：(1) relay base station is divided into into border relay base station, multiple barrier relay base station and general
Logical relay base station, wherein multiple barrier relay base station are defined as in the distance with three or more than three cell base stations, two-by-two away from
Multiple barrier distance threshold Δ is less than from its differencemdRelay base station；Border relay base station is defined as the distance with two cell base stations
Difference be less than frontier distance threshold deltaddNon- multiple barrier relay base station relay base station；Common relay base station is defined as except border
Relay base station outside relay base station and multiple barrier relay base station；(2) trunk subscriber equipment is divided into border trunk subscriber to set
Standby, multiple barrier trunk subscriber equipment and common trunk subscriber equipment, wherein, multiple barrier trunk subscriber device definition is received
In three or more than three most strong cell reference signals, the difference of reference signal strength is less than multiple barrier signalc threshold Ω two-by-twoms
Trunk subscriber equipment；Border trunk subscriber device definition is that the difference of the intensity of the most strong cell reference signals of two for receiving is little
In sideband signal thresholding ΩdsNon- multiple barrier trunk subscriber equipment trunk subscriber equipment；Commonly trunk subscriber device definition is
Trunk subscriber equipment in addition to border trunk subscriber equipment and multiple barrier trunk subscriber equipment；
Candidate relay node is selected, candidate relay node set is constituted；
Via node is selected from candidate relay node set, its step is：(1) when candidate relay base station is not all in " numerous
It is busy " state when：According to the idle common relay base station of candidate, candidate's free time border relay base station, candidate's free time multiple barrier relaying base
Stand, the common relay base station of candidate, boundary candidate relay base station, candidate's multiple barrier relay base station, the busy common relay base station of candidate,
The busy border relay base station of candidate, the busy multiple barrier relay base station of candidate, the idle common trunk subscriber equipment of candidate, candidate are idle
Border trunk subscriber equipment, candidate's free time multiple barrier trunk subscriber equipment, the common trunk subscriber equipment of candidate, boundary candidate relaying
User equipment, candidate's multiple barrier trunk subscriber equipment, the busy common trunk subscriber equipment of candidate, the busy border trunk subscriber of candidate
Equipment, the order of the busy multiple barrier trunk subscriber equipment of candidate choose one or more as via node；(2) work as candidate relay
When base station is all in " busy " state：For the real time business of low rate, according to the idle common trunk subscriber equipment of candidate, candidate
Idle border trunk subscriber equipment, candidate's free time multiple barrier trunk subscriber equipment, the common trunk subscriber equipment of candidate, boundary candidate
Trunk subscriber equipment, candidate's multiple barrier trunk subscriber equipment, the busy common relay base station of candidate, the busy border of candidate relay base
Stand, the busy multiple barrier relay base station of candidate, the busy common trunk subscriber equipment of candidate, the busy border trunk subscriber equipment of candidate,
The order of the busy multiple barrier trunk subscriber equipment of candidate chooses one or more as via node；(3) work as candidate relay node
When there is multiple same type nodes in set, relaying section is selected according to order from small to large according to packet queue queue length
Point.
2. method according to claim 1, wherein described select candidate relay node to constitute candidate relay node set
Step is：
First, have relaying require destination node measurement receive from each relay base station to be selected and trunk subscriber equipment to be selected
Reference signal, for each relay base station to be selected or trunk subscriber equipment to be selected, perform procedure below：
(1) relay base station to be selected or trunk subscriber equipment to be selected are obtained to the signal to noise ratio of destination node link by survey calculation
Meansigma methodssAccording to formula：It is calculated the relay base station to be selected
Or trunk subscriber equipment to be selected interrupts thresholding γ to the signal to noise ratio of destination node linko, when the signal to noise ratio of signal is less than signal to noise ratio
Interrupt thresholding γoWhen, communication link will occur to interrupt, wherein
(2) according to formula：WithIt is calculated this to treat
Relay base station or trunk subscriber equipment to be selected are selected to the outage probability P of destination node linkoutWith efficiency of transmission η；
Secondly, each relay base station to be selected and trunk subscriber equipment to be selected are obtained to outage probability and the transmission of destination node link
After efficiency, by outage probability less than or equal to interruption thresholding ΓoutageAnd efficiency of transmission is more than or equal to efficiency of transmission thresholding
ΔeffRelay base station to be selected or trunk subscriber equipment to be selected include candidate relay node set；Wherein：According to survey calculation
The size of the Rice factor κ for obtaining, parameter N, α in above-mentioned formulai、βi、With different expression formulas；(1) work as Rice factorWhen, judge that channel is Rice channel, now N is the integer more than or equal to 1, (2) work as Rice factorWhen, judge channel and believe for Rayleigh
Road, now N=1,β1=1,
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