CN105282852B - A kind of lte-a system full duplex resource allocation methods based on unified priority - Google Patents
A kind of lte-a system full duplex resource allocation methods based on unified priority Download PDFInfo
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Abstract
The present invention provides a kind of lte-a system full duplex resource allocation methods based on unified priority, original resource allocation algorithm is improved, when time slot scheduling starts, first calculate all user uplink PF values and downlink PF value, then unified priority ranking is carried out, according to priority orders, it is followed successively by customer service and selects optimal resource block, subsequent customer service will avoid that co-channel interference occurs with the business of front.Resource allocation methods of the invention make the availability of frequency spectrum of lte-a system, handling capacity be apparently higher than common resources algorithm；The handling capacity difference of uplink and downlink is little, and fairness and uplink and downlink fairness are all fine between user.
Description
Technical field
The invention belongs to wireless communication technology field more particularly to a kind of lte-a system full duplex resource allocation methods.
Background technique
LTE-A is the evolution version of LTE, the purpose is to for meet in the coming years the higher demand of wireless communications market and
More applications, meet and the needs of more than IMT-Advanced, while also holding is to the preferable backwards compatibility of LTE.LTE-A is adopted
With crucial skills such as carrier wave polymerization, the enhancing of uplink/downlink multiple antennas, coordinated multipoint transmission, relaying, the enhancings of heterogeneous network interference coordination
Art can greatly improve peak data rate, peaks spectrum efficiency, cell mean spectral efficiency and the cell side of wireless communication system
Boundary's user performance, while the networking efficiency of whole network can be also improved, this becomes LTE and lte-a system in the coming years
The mainstream of Development of Wireless Communications.
There are two types of scheduling modes for lte-a system: dynamic dispatching and semi-continuous scheduling, wherein dynamic dispatching is suitable for data volume
Greatly, sudden Packet Service strong, delay requirement is not high, and semi-continuous scheduling is on the basis of dynamic dispatching for support LTE language
What the business such as sound introduced.There are mainly three types of classic algorithm, polling algorithm, max carrier to interference algorithm and ratio justices to calculate for dynamic dispatching
Method.Only the maximum user of preferential selection carrier/interface ratio carries out resource allocation to max carrier to interference algorithm, i.e., preferentially good to channel condition
User distributes resource, to carry out transmission data；And if the channel condition of the user is deteriorated, algorithm will reselect current tool
There are the other users of good channels.This algorithm can achieve the limiting value of throughput of system, but it is lost practical meaning simultaneously
Justice, because the fairness polling algorithm being had ignored between user completely makes no exception to all users, mechanically according to certain week
Phase is cyclically that each user distributes identical resource, identical as MAX C/I algorithm, it is not intended that the clothes that user has been obtained
Business situation, i.e., memoryless allocation algorithm, which meets the fairness between user with flying colors, but the handling capacity of system can
Can very low proportional fair algorithm two kinds of algorithms above system throughput figureofmerit and user fairness index are carried out respectively respectively
Extreme stresses, therefore the algorithm that a kind of pair of two indices of Lock-in are compromised, and here it is PF algorithms at present in the industry
There is common recognition, resource allocation algorithm improves the resource allocation for proposing to be suitable for real system by mainly based on proportional fair algorithm
Algorithm.
Conventional half duplex mode is mainly frequency division duplex (FDD) and time division duplex (TDD), with to avoid transmitter signal pair
Interference of the receiver signal on frequency domain or time domain.In FDD mobile communication system, base station transmitter passes through down channel, will
Signal is sent to mobile terminal, and mobile terminal then passes through up channel and sends a signal to base station receiver, because of down channel
Different frequencies is used with up channel, base station receiver is obtained respectively using the passband and forbidden band of filter and receives signal and suppression
Downlink channel signals (interference for inhibiting base station transmitter signal) processed.For this purpose, FDD pays two parts of frequency expenses: under portion is
Row channel frequency expense, another is upstream channel frequency expense.And TDD system down channel is arranged on a series of time slots,
Up channel is then arranged on additional series time slot, and when receiving uplink channel signals, transmitter stops working for base station, from
And the interference of transmitting signal is avoided, system time resource overhead portion is used for uplink, another is used for down channel.No matter
FDD or TDD, system are that double resource overhead has all been paid in duplex communication.Because frequency resource and time resource have equivalent
Property, so theoretically FDD and TDD spectrum efficiency having the same.As a result meet local maxima, but algorithm complexity is than traversal
Algorithm complexity is low.And full duplex technology (CCFD) uses identical time, identical frequency to emerging same frequency simultaneously, sends out simultaneously
Wireless signal is penetrated and received, frequency or the expense of time interval resource in traditional dual-mode are reduced, to reach raising spectrum efficiency
Purpose.
After introducing full duplex, uplink signal and downlink signal can be simultaneously in a transmissions, this allows for receiving end and exists
It will receive the interference of the homogenous frequency signal of own transmission when receiving echo signal, so full duplex technology to realize full duplex technology
Key be eliminate base station and the end UE self-interference.
All self-interference cancellation is conducted in-depth research both at home and abroad, but mostly lays particular emphasis on base station self-interference cancellation
Plan-validation, main thought is generally limited to the inhibition of antenna self-interference, radio frequency self-interference inhibits and digital AF panel, is seldom related to
Interference to user terminal is eliminated.
Self-interference cancellation technology has been easier to realize for base station end, but still for the end UE technical level
It is extremely difficult to, so solving the problems, such as that a universal thinking of full duplex is exactly to improve system model now, uses base station end complete
Throughput of system and the availability of frequency spectrum can also be substantially improved in this case using simplex mode in duplex, the end UE.It is such as attached
Shown in Fig. 1, in certain time slot, UE1 uses RB1 resource block in uplink, uses RB2 resource block in downlink；Opposite, UE2 is in uplink
Using RB2 resource block, RB1 resource block is used in downlink, premise, which is to ensure that between UE1 and UE2, to be interfered with each other.So
Much more complicated than the resource allocation of former lte-a system of resource allocation after joined full duplex, need to fully consider a use
Family is for other with the disturbed condition of frequency user.
Currently, there is some full duplex Resource Allocation Formulas, can effective lifting system handling capacity, but there are still one
A little problems.Some schemes first find out downlink user best on current resource block, then be its attempt matching uplink user, PF it
Uplink and downlink user with maximum combination as this resource block, then finds user again for next resource block.Side also
All resource blocks are first distributed to downlink business by case, and then re-multiplexing is to uplink service, on condition that requiring uplink will not be to downlink
It impacts.It can thus be seen that present many full duplex schemes, all based on the resource allocation of downlink, ascending resource distributes
Supplemented by, the downlink traffic that will lead to system in this way is apparently higher than uplink traffic, causes certain imbalance.
Summary of the invention
In order to solve the problems, such as that in the prior art, the present invention provides a kind of lte-a system based on unified priority is entirely double
Work resource allocation methods after introducing full duplex in LTE-A, carry out system resource allocation with this method, it is possible to reduce tradition
Frequency or the expense of time interval resource in dual-mode, to achieve the purpose that improve spectrum efficiency and power system capacity effect.
The present invention is achieved through the following technical solutions:
A kind of lte-a system full duplex resource allocation methods based on unified priority, the described method comprises the following steps:
S100: current time slots k, calculate the uplink average speed v of each userU(k, n) and downlink average speed vD(k,n)；
S101: uplink service priority factor p is calculatedU(k, n) and downlink priority factor and pD(k,n)；
S102: unified row is carried out by priority factor to all uplink services and downlink business in the way of from big to small
Sequence obtains priority sequence priority (t)；
S103: recalculating the interference effect between UE, updates user's interference table influence (n1,n2), wherein n1、n2
The label of two UE is not respectively represented；
S104: according to priority serial number, resource block is distributed since the UE business of highest priority, n=1 is set；
S105: according to resource block label, traversing all resource blocks, search the most suitable resource block of current UE business, from the
M=1 is arranged in one resource BOB(beginning of block)；
S106: judge whether the resource block is used by other UE business identical with current UE traffic direction；If so, jumping
Go to S110；
S107: judge whether the resource block has been used by other UE business opposite with current UE traffic direction；If
It is not to jump to S109；
S108: user's interference table is searched, if the interference in S107 between two users of common source block cannot be ignored
Disregard, then jumps to S110；
S109: comparing the temporal maximum of the resource block and this search, if being better than temporal maximum, updates
Temporal maximum；
S110: if resource block does not traverse completely, continue to judge that next resource block, m=m+1 jump to S106；
S111: judging whether all UE business are all assigned to resource block, if so, jumping to S113；
S112: judge whether each resource block is respectively used by uplink and downlink once, if it is not, n=n+1, then branches to
S105；
S113: the resource allocation of current time slots terminates.
As a further improvement of the present invention, the downlink average speed vD(k, n) are as follows:
N=1,2,3 ... .N,
Wherein, vD(k, m, n) be on k-th time slot n-th of UE in the downlink transmission rate of m-th of RB.
As a further improvement of the present invention, the uplink PF value isWherein, tU(k, n) is
Mean Speed of the n UE in preceding k subframe, vU(k, n) is the uplink Mean Speed of n-th of UE on k-th of time slot.
As a further improvement of the present invention, the downlink PF value isWherein, tD(k, n) is
Mean Speed of the n UE in preceding k subframe, vD(k, n) is the downlink Mean Speed of n-th of UE on k-th of time slot.
As a further improvement of the present invention, in user's interference table, influence (n1,n2) it is greater than thermal noise intensity
It is designated as 1, representative cannot share same resource block, and less than being then designated as 0, representative can share same resource block.
The beneficial effects of the present invention are: the present invention improves original resource allocation algorithm, when time slot scheduling starts,
All user uplink PF values and downlink PF value are first calculated, unified priority ranking is then carried out, according to priority orders, successively
Optimal resource block is selected for customer service, subsequent customer service will avoid that co-channel interference occurs with the business of front.According to
Method of the invention can obtain: (1) system spectrum utilization rate, handling capacity are apparently higher than common resources algorithm；(2) uplink and downlink is handled up
Amount difference is little, and fairness and uplink and downlink fairness are all fine between user.
Detailed description of the invention
Fig. 1 is the realization mechanism schematic diagram of full duplex in LTE-A cell；
Fig. 2 is priority sequence schematic diagram of the invention；
Fig. 3 is priority sequence initialization schematic diagram of the invention；
Fig. 4 is user's interference table schematic diagram of the invention；
Fig. 5 is the flow chart of resource allocation methods of the invention；
Fig. 6 is uplink and downlink flow curve figure of each user in simulation time section；
Fig. 7 is to promote uplink and downlink flow curve figure of each user in simulation time section after base station transmitting power；
Fig. 8 is the graph of relation of distance and flow；
Fig. 9 is the graph of relation of simulation time and flow system flow.
Specific embodiment
The present invention is further described for explanation and specific embodiment with reference to the accompanying drawing.
After full duplex technology is added to LTE-A, the present invention is on existing physical model basis (as shown in Fig. 1)
On, resource allocation algorithm is improved, it is specified that when each time slot scheduling starts, and first finds out each user respectively on all resource blocks
Uplink and downlink Mean Speed, then the PF value of the uplink and downlink business of each user is calculated, then unite to all uplink and downlink business
One sequence is that successively user selects resource block according to priority orders, and subsequent customer service will be avoided when selecting resource block
Co-channel interference is caused to the customer service of front.
Assuming that having N number of UE and M RB resource block in the cell that an eNode is serviced, enabling vD(k, m, n) is k-th
N-th of UE is in the downlink transmission rate of m-th of RB on time slot, then the downlink Mean Speed of n-th of UE is on k-th of time slot
N=1,2,3 ... .N
The metric p of its PFD(k, n) can be indicated are as follows:
N=1,2,3 ... .N
Wherein, tD(k, n) is Mean Speed of n-th of UE in preceding k subframe.
The uplink PF value p of n-th of UE on k-th of time slot can also similarly be obtainedU(k, n), process is similar, no longer in detail
It states.
The p of all users in the case where obtaining current time slotsU(k,n)、pDAfter (k, n), unified sequence is carried out, according to from big to small
Sequence, obtain a length be 2N sequence, format is as shown in Fig. 2, and a UE is divided into is added sequence twice, is respectively
Correspond to its uplink service and downlink business.
Customer service distribution resource, which is followed successively by, according still further to priority orders traverses all resources under active user's business
Block finds out selection resource block of the maximum resource block of transmission rate as practical distribution when, and does bid to selection resource block
Note, records it and is used by certain business of some UE, and setting record_U (i) indicates i-th of resource block in uplink by which
UE is used；Record_D (i) indicates i-th of resource block is used in downlink by which UE.But during traversal it is noted that
Two kinds of situations:
First, if the resource block is used by other UE business identical with current UE traffic direction, skip
This resource block, continually looks for.
Second, if the resource block is used by other UE business opposite with current UE traffic direction, search
User's interference table.If the interference between them can be ignored, which can be in limit of consideration；If interference can not
To ignore, then this resource block is skipped, is continually looked for.
After current UE business searches out suitable resource block, continue the job search of next UE business, until all
UE business has all been assigned to resource block or (uplink is primary, downlink is primary) twice has been assigned in all resource blocks, then this
The resource allocation task of secondary time slot scheduling terminates.
In addition, PF calculation formula is not applicable, because of it of all UE business when the first sub-distribution distributes resource block
Preceding average speed is all 0.Here, priority orders when artificially providing the first sub-distribution resource block, all downlink priority are high
In all upstream priorities；Identical services direction, the low UE priority of serial number are high.As shown in Fig. 3
Whether above-mentioned user's interference table is to record different UE can phase when using the same frequency resource block of different directions
The bivariate table mutually interfered, uses influence (n1,n2) state, wherein n1、n2The mark of two UE is not respectively represented
Number.Lte-a system can obtain different resource block in the uplink of different user or the channel feelings of downlink by common signaling
Condition, but the case where system can not obtain channel between user.In model of the invention, it is assumed that system can be by being set to technology
The accurate location of UE in the cell is obtained, user emission power is consistent, and channel fading only considers path loss, so that it may calculate
One user transmits signals to the signal strength up to another user, it is specified that being greater than thermal noise intensity is designated as 1, and representative cannot be total to
With same resource block, less than being then designated as 0, representative can share same resource block, interfere user's table as shown in attached 4 figure.Due to UE
With certain mobility, so the interference coefficient between user will be updated in each time slot.
As shown in Fig. 5, the LTE-A full duplex system uplink and downlink resource allocation methods of the invention based on unified priority
Process can be described in detail as follows:
S100: current time slots k, calculate the uplink average speed v of each userU(k, n) and downlink average speed vD(k,n)。
S101: uplink service priority factor p is calculatedU(k, n) and downlink priority factor and pD(k,n)。
S102: unified row is carried out by priority factor to all uplink services and downlink business in the way of from big to small
Sequence obtains priority sequence priority (t).
S103: recalculating the interference effect between UE, updates user's interference table influence (n1,n2)。
S104: according to priority serial number, resource block is distributed since the UE business of highest priority, n=1 is set.
S105: according to resource block label, traversing all resource blocks, search the most suitable resource block of current UE business, from the
M=1 is arranged in one resource BOB(beginning of block).
S106: judge whether the resource block is used by other UE business identical with current UE traffic direction；If so, jumping
Go to S110.
S107: judge whether the resource block has been used by other UE business opposite with current UE traffic direction；If
It is not to jump to S109.
S108: user's interference table is searched, if the interference in S107 between two users of common source block cannot be ignored
Disregard, then jumps to S110.
S109: comparing the temporal maximum of the resource block and this search, if being better than temporal maximum, updates
Temporal maximum.
S110: if resource block does not traverse completely, continue to judge that next resource block, m=m+1 jump to S106.
S111: judging whether all UE business are all assigned to resource block, if so, jumping to S113.
S112: judge whether each resource block is respectively used by uplink and downlink once, if it is not, n=n+1, then branches to
S105。
S113: the resource allocation of current time slots terminates.
Performance Evaluation is carried out for lte-a system, considers an eNode and cell, and UE divides at random in the cell
Cloth, and there is certain movement speed, base station end transmission power is constant, and the end UE transmission power is identical and constant.Design parameter
It is as shown in table 1:
1 simulation parameter of table
| Simulation parameter | Setting value |
| User's number | 50 |
| Resource block number | 40 |
| Base station radius | 1km |
| System carrier frequency | 2GHz |
| Amount of bandwidth | 10MHz |
| User velocity | 20km/h |
| Base station transmitting power | 30dBm |
| User emission power | 30dBm |
| Time slot scheduling | 1ms |
| Path loss | L=32.45+20lg (f)+20lg (d) |
| Flow rate mode | Uplink and downlink sustained traffic |
| Thermal noise power spectrum | -174dBm/Hz |
| Link circuit self-adapting | It is provided according to 3GPP LTE-A |
| Target Block Error Rate | 10% |
| Retransmission scheme | There is the HARQ of incremental redundancy |
When attached drawing 6 indicates that base station is identical with UE transmission power, uplink and downlink flow of each user in simulation time, horizontal axis
Indicate user label, the longitudinal axis indicates flow.As seen from the figure, it joined full duplex in LTE-A, and use new algorithmic dispatching
After resource, the downlink traffic of each user is approximately equal to uplink traffic, this is because this algorithm by uplink service and downlink business into
Row unified distribution, the uplink and downlink service traffics of the same user do not have too big gap.If adjusting base station transmitting power, make it
Slightly larger than UE transmission power, downlink business flow can be higher by uplink service flow accordingly, as shown in Fig. 7.
Attached drawing 8 is rearranged to 6 information of attached drawing, and horizontal axis is changed to the ratio of user Yu base station distance and radius of society,
Maximum value 1 indicates just on cell boarder.It can see as shown in attached drawing 8, the flow of uplink and downlink remoter apart from base station
Smaller, this meets the resource allocation result of normal cell, and the channel condition that border user is generally not so good as central user is good.It can be with
See, apart from the farther away place in base station, the downlink traffic of user can't be clearly distinguishable from uplink traffic, this further explanation
The problems in attached drawing 6, between user fairness and uplink and downlink fairness are very good.
Attached drawing 9 illustrates the uplink and downlink flow of entire LTE-A cell and the relationship of simulation time.In view of not being added entirely
Before duplex, all same time slots of resource block can only be given to uplink or downlink, and in cell communication, downstream rate is again general
All over be higher than downstream rate, so, it is assumed that in the case of non-full duplex, resource all gives downlink user, that is, has reached red line in figure
Representative flow, and full duplex is added, after improving PF algorithm, some flows have been had more than before, have been reached representated by blue line
Flow, the availability of frequency spectrum be increased dramatically, significant increase system throughput under the premise of guaranteeing fairness.But this is calculated
Method also has certain drawback, and the uplink and downlink flow of cell is not sufficiently stable, and has big fluctuation, although realizes frequency at some low ebb moment
The multiplexing of rate, but and the promotion availability of frequency spectrum not yet in effect.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (5)
1. a kind of lte-a system full duplex resource allocation methods based on unified priority, which is characterized in that the method includes
Following steps:
S100: current time slots k, calculate the uplink average speed v of each userU(k, n) and downlink average speed vD(k,n)；
S101: uplink service priority factor p is calculatedU(k, n) and downlink priority factor and pD(k,n)；
S102: unified sequence is carried out by priority factor to all uplink services and downlink business in the way of from big to small, is obtained
To priority sequence priority (t)；
S103: recalculating the interference effect between UE, updates user's interference table influence (n1,n2),
Wherein, n1、n2Respectively represent the label of two UE；
S104: according to priority serial number, resource block is distributed since the UE business of highest priority, n=1 is set；
S105: according to resource block label, all resource blocks are traversed, the most suitable resource block of current UE business are searched, from first
M=1 is arranged in resource BOB(beginning of block)；
S106: judge whether the resource block is used by other UE business identical with current UE traffic direction；If so, jumping to
S110；
S107: judge whether the resource block has been used by other UE business opposite with current UE traffic direction；If it is not,
Jump to S109；
S108: searching user's interference table, if the interference in S107 between two users of common source block cannot ignore,
Then jump to S110；
S109: comparing the temporal maximum of the resource block and this search, if being better than temporal maximum, updates interim
Maximum value；
S110: if resource block does not traverse completely, continue to judge that next resource block, m=m+1 jump to S106；
S111: judging whether all UE business are all assigned to resource block, if so, jumping to S113；
S112: judge whether each resource block is respectively used by uplink and downlink once, if it is not, n=n+1, then branches to S105；
S113: the resource allocation of current time slots terminates.
2. resource allocation methods according to claim 1, it is characterised in that: the downlink average speed vD(k, n) are as follows:
Wherein, vD(k, m, n) is that for n-th of UE in the downlink transmission rate of m-th of RB, M is resource block number on k-th of time slot.
3. resource allocation methods according to claim 1, which is characterized in that the uplink PF value isWherein, tU(k, n) is Mean Speed of n-th of UE in preceding k subframe, vU(k, n) is k-th of time slot
The uplink Mean Speed of upper n-th of UE.
4. resource allocation methods according to claim 1, which is characterized in that the downlink PF value isWherein, tD(k, n) is Mean Speed of n-th of UE in preceding k subframe, vD(k, n) is k-th of time slot
The downlink Mean Speed of upper n-th of UE.
5. resource allocation methods according to claim 1, which is characterized in that in user's interference table, influence
(n1,n2) be greater than thermal noise intensity be designated as 1, representative cannot share same resource block, and less than being then designated as 0, representative can share phase
Same resource block.
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