CN107148078A - A kind of user access control method and device for mixing full duplex half-duplex network - Google Patents
A kind of user access control method and device for mixing full duplex half-duplex network Download PDFInfo
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- CN107148078A CN107148078A CN201710253304.2A CN201710253304A CN107148078A CN 107148078 A CN107148078 A CN 107148078A CN 201710253304 A CN201710253304 A CN 201710253304A CN 107148078 A CN107148078 A CN 107148078A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
Abstract
The present invention relates to a kind of user access control method and device for mixing full duplex half-duplex network, belong to communication technical field.The control method sets up Virtual User by initialization step, and network configuration is equal into the number of channel into uplink and downlink number of users；Step is pre-allocated by channel to build using the transmission power sum of user couple as matrix of elements { Pi,j, and with the minimum target of total transmission power, the solution by the Assignment Problems of utility matrix of the matrix is obtained as the control parameter of configuration user access network；The full duplex user couple that can not be accessed is rejected by feasibility checking step, idle channel is obtained；And idle channel is accessed in a half duplex mode by choosing the minimum user of power in the channel real user that allocation step is never accessed again.Not only computational complexity is low for the control method, and network user's access and total transmission power can be carried out simultaneously to optimize.
Description
Technical field
The present invention relates to communication technical field, specifically, it is related to a kind of use for mixing full duplex half-duplex network
Family connection control method and user access control device.
Background technology
With the increase and the fast development of wireless traffic of wireless device, future wireless network needs to accommodate more movements
Terminal and the business for supporting more high data rate.In the case where frequency spectrum resource is limited, it is using the higher technology of spectrum efficiency
Inevitable requirement.With frequency, full duplex becomes a very potential technology with its higher spectrum efficiency hoisting power simultaneously.
With traditional compared with two time slots or two channels carry out the time division duplex or frequency division duplex technology of uplink and downlink, full duplex
Technology can be such that uplink and downlink are carried out simultaneously in same frequency range, i.e., spectrum efficiency is double.Therefore, full duplex technology becomes
One of key technology of 5th Generation Mobile Communication System (5G).
But there is self-interference in full duplex technology, although self-interference can be down to by newest self-interference technology for eliminating-
110dB, allows it to practical application, so that more numbers of users can be accommodated under conditions of channel resource is limited, but
It is that its performance is inferior to half-duplex network, accordingly, it is capable to open the mixing full duplex half pair of full-duplex mode and semiduplex mode simultaneously
Work network, which turns into, can take into account being preferably selected for access customer number and network performance simultaneously, but in such a mode, be difficult to realize
Optimize while user's access is with Power Control.
The content of the invention
It is an object of the invention to provide a kind of user access control method for mixing full duplex half-duplex network, with simultaneously excellent
Change user's access and the total transmission power of network；
It is a further object of the present invention to provide a kind of user access control device for mixing full duplex half-duplex network, with same
User's access of Shi Youhua networks and total transmission power.
In order to realize above-mentioned purpose, it is pre- that the user access control method that the present invention is provided includes initialization step, channel
Allocation step, feasibility checking step and channel allocation step again；Wherein, initialization step is included in N number of channel, K
In the network of the true downlink user of individual true uplink user and M increase (N-K) individual virtual uplink user and (N-M) it is individual it is virtual under
Row user；Channel predistribution step includes building N N matrix { Pi,j, Pi,jFor the transmission power sum of a pair of users (i, j),
If a pair of real users are to being unsatisfactory for QoS restrictive conditions, Pi,jEqual to constant L1, L1More than two real users constitute full duplex
Pair when maximum transmission power sum, if real user and Virtual User constitute full duplex pair, Pi,jFor half pair of real user
Work power, if two Virtual User constitute full duplex pair, Pi,jEqual to constant L2, L2More than two real users constitute full duplex
Pair when maximum transmission power sum, with the minimum target of total transmission power, obtain with matrix { Pi,jBe utility matrix appointment
The solution of problem, and the configuration user access by control parameter of the solution；If feasibility checking step includes having user not access,
The full duplex user couple where the user is rejected, idle channel is obtained；Allocation step is true including what is never accessed again for channel
Choose the minimum user of n power in user to access in a half duplex mode, n is the quantity of vacant channels.
By setting up virtual uplink user and virtual downlink user and building square as element to transmission power sum using user
Battle array { Pi,j, it will need what is carried out step by step to choose asking for transmission power minimal solution on the basis of accessing user's number is maximized originally
Topic changes into the minimum power problem of single step, the standard assignments problem that available K-M algorithms are solved is changed into, greatly
While reducing computational complexity, the user's access for optimizing network simultaneously and total transmission power are realized.
Specific scheme is L2＞ L1, when channel is not enough, preferentially by channel distribution give by two real users constitute it is complete
Duplex is right, rather than the full duplex pair being made up of two Virtual User.
Another specific scheme is that QoS restrictive conditions are
Wherein,It is the minimum data rate requirement of uplink user,It is the minimum data rate requirement of downlink user,To be upper
The speed of row user,For the speed of downlink user, a is outage probability.
If more specifically scheme is a pair of real users to being unsatisfactory forThen
Pi,j=L1；Wherein, η is self-interference rain scavenging coefficient,For the average channel power gain of uplink user,For downlink user
Average channel power gain,For the average channel power gain between uplink user and downlink user.It is effectively prevented from two very
Real user because distance is not suitable for can not match the problem of occur, to access more users.
Specific scheme is the power sum that a pair of real users constitute full duplex pair again
Wherein,For the noise power of up-link,For the noise power of downlink.In feasible area,
Choose minimum emissive power sum and build matrix element, further optimize transmission power.
Another specific scheme is the optimal solution set that standard assignments problem is obtained using K-M algorithms.
It is preferred that scheme be when base station be in full-duplex mode when, the speed of uplink user is
Downlink userSpeed beWherein,When being matched for uplink user with downlink user
Transmission power,Transmission power when being matched for downlink user and uplink user,To be the noise power of up-link,For the noise power of downlink,For the channel gain of uplink user,For the channel gain of downlink user, hi,jOn being
The gain of interference channel between row user and downlink user, η is self-interference rain scavenging coefficient；When base station is in semiduplex mode,
The speed of uplink user isThe speed of downlink user isPi UTo be upper
The transmission power of row user,For the transmission power of downlink user.
Another preferred scheme is to include preposition anticipation step：If M+K≤N, true uplink user with it is true under
Otherwise row carries out initialization step with accessing in a half duplex mode per family.
In order to realize above-mentioned another object, the user access control device that the present invention is provided includes initialization unit, channel
Pre-allocate unit, feasibility inspection unit and channel allocation unit again；Wherein, initialization unit be used for N number of channel,
Increase (N-K) individual virtual uplink user and (N-M) are individual virtual in the network of K true uplink users and M true downlink users
Downlink user；Channel predistribution unit is used to build N N matrix { Pi,j, Pi,jFor a pair of users (i, j) transmission power it
With if a pair of real users are to being unsatisfactory for QoS restrictive conditions, Pi,jEqual to constant L1, L1More than two real users constitute complete
Maximum transmission power sum during duplex pair, if real user constitutes full duplex pair, P with Virtual Useri,jFor real user
Half-duplex power, if two Virtual User constitute full duplex pair, Pi,jEqual to constant L2, L2More than two real users constitute complete
Maximum transmission power sum during duplex pair, with the minimum target of total transmission power, is obtained with matrix { Pi,jIt is utility matrix
The solution of Assignment Problems, and the configuration user access by control parameter of the solution；If feasibility inspection unit is used for having user not connect
Enter, then reject the full duplex user couple where the user, and obtain idle channel；Allocation unit is used to never access channel again
Real user in choose the minimum user of n power and access in a half duplex mode, n for vacant channels quantity.
Brief description of the drawings
Fig. 1 is the communication scheme of mixing full duplex half-duplex hybrid network in the embodiment of the present invention；
Fig. 2 is the workflow diagram of user access control method in the embodiment of the present invention；
Fig. 3 is the communication signal after mixing full duplex half-duplex hybrid network addition Virtual User in the embodiment of the present invention
Figure；
The comparison diagram of Fig. 4 transmission powers for needed for the embodiment of the present invention and comparative example；
Fig. 5 is the structured flowchart of user access control device in the embodiment of the present invention.
Embodiment
With reference to embodiment and its accompanying drawing, the present invention is further illustrated.
Embodiment
As shown in figure 1, base station 1 can open full-duplex mode and semiduplex mode, user can only locate due to hardware limitation
In semiduplex mode, in the communications network, K true uplink users are includedM true downlink usersAnd N bars letter
Road, max { K, M }≤N.
The pattern opened according to base station, user has two kinds of different access ways：
1) when base station is in full-duplex mode, uplink userAnd downlink userEnter row information in same channel
Transmission, uplink user 4 as shown in Figure 1 and downlink user 5 constitute full duplex user couple, base station 1 by self-interference, and under
Row user 5 is disturbed by the cochannel from uplink user 4, and the achievable rate of the two is expressed as：
Wherein,WithDifference position uplink userAnd downlink userTransmission power when matching, Pi UWith
It is uplink user respectivelyAnd downlink userTransmission power.WithIt is uplink userAnd downlink userLetter
Road gain, hi,jIt is uplink userAnd downlink userBetween interference channel gain, η is self-interference rain scavenging coefficient,For
It is the noise power of up-link,For the noise power of downlink.
2) when base station is in semiduplex mode, uplink userAnd downlink userEach exclusive channel is believed
Breath transmission, uplink user 3 as shown in Figure 1 and downlink user 2 are half-duplex user, uplink userAnd downlink userAchievable rate be expressed as：
Selection channel is rayleigh fading channel, thenAnd hi,jAll obeying average isWithIndex point
Cloth.
When being in full-duplex mode in base station, a pair of uplink usersAnd downlink userIt must is fulfilled for certain QoS limits
System, the present embodiment from outage probability as QoS criterions, i.e.,：
Wherein,WithIt is uplink userAnd downlink userMinimum data rate requirement, a be interrupt it is general
Rate.
For meeting above-mentioned QoS limitations, the transmission power domain of a pair of upstream and downstream users must is fulfilled for：
And if only ifWhen, just there is feasible power domain, now, optimal transmitting
PowerWithIt is expressed as：
As schemed shown in 2, this implementation mixing full duplex half-duplex network example includes preposition anticipation step S1, initialization step
S2, initial channel allocation step S3, feasibility checking step S4 and channel assignment step S5 again.
Preposition anticipation step S1, if M+K≤N, K true uplink users and M true downlink users are with half-duplex
Pattern is accessed, and otherwise carries out initialization step S2.
Initialization step S2, increase (N-K) individual virtual uplink user and (N-M) individual virtual downlink user.
In original packet containing K uplink userM downlink userN bars channel leads to
On the basis of communication network, increase (N-K) individual virtual uplink user(N-M) individual virtual downlink userN number of uplink user is included to constructN number of downlink userThe communication network of N bar channels.
Channel pre-allocates step S3, builds N N matrix { Pi,j, element Pi,jFor a pair of users (i, j) transmission power it
Match somebody with somebody the communication network postponed with, initialized step S2, there are following several different up-downgoing matching ways to need consideration：
1) for 1≤i≤K and 1≤j≤M, if a pair of users are to being unsatisfactory for QoS restrictive conditions, Pi,j=L1, and L1Greatly
Maximum transmission power sum when two real users constitute full duplex pair, i.e.,If uplink userAnd downlink userConstitute a pair of full duplexs pair, i.e., uplink user 4 as shown in Figure 3 and downlink user 5 constitute a pair it is complete double
Work user couple, optimum transmission power sum is,
2) for 1≤i≤K and M+1≤j≤N, now, uplink userMatched with a virtual downlink user, then it is up
UserIn semiduplex mode, i.e., virtual downlink user 8 as shown in Figure 3 is matched with uplink user 3, and uplink user 3 is in
Semiduplex mode, the optimum transmission power of uplink user is
3) for K+1≤i≤N and 1≤j≤M, now, downlink userMatched with a virtual uplink user, then it is descending
UserIn semiduplex mode, i.e., virtual uplink user 7 as shown in Figure 3 is matched with downlink user 2, and downlink user 2 is in
Semiduplex mode, the optimum transmission power of downlink user is
4) for K+1≤i≤N and M+1≤j≤N, now, virtual uplink user can not be matched somebody with somebody with virtual downlink user
Right, it is a very big value L to assign the transmission power sum of such virtual-Virtual User pair2, for example, L2It is true more than two
User constitutes maximum transmission power sum during full duplex pair, i.e.L in the present embodiment2＞ L1。
Transmission power minimal solution is chosen on the basis of maximization accessing user's number so as to which script to be needed to substep progress
Problem is converted for the minimum power problem of single step：
Above mentioned problem is that utility matrix is { Pi,jStandard assignments problem.
The solution of the standard assignments problem, i.e. { ρ are obtained by K-M algorithmsi,j, and the arrangement user by control parameter of the solution
Access, for example, ρi,j=0, represent user (i, j) unpaired access, ρi,j=1 represents user (i, j) pairing access.
Feasibility checking step S4, checking whether there is user can not access, if so, then using the full duplex where the user
Family removes to obtain idle channel from solution.
Channel allocation step S5 again, the full duplex never accessed is to choosing n minimum user of power with partly in user
In dual-mode access to communication networks, wherein, n is the number of vacant channels.
Referring to Fig. 5, the control device 9 of user's access of the present embodiment mixing full duplex half-duplex network includes preposition anticipation
Unit 91, initialization unit 92, channel pre-allocate unit 93, feasibility inspection unit 94 and channel allocation unit 95 again.
Preposition anticipation unit 91 is used for as M+K≤N, and K true uplink users are configured to M true downlink users
Access in a half duplex mode.
Initialization unit 92 is used to increase (N-K) individual virtual uplink user and (N-M) individual virtual downlink user, and K is true
Uplink user number, M is true downlink user number, and N is the number of channel.
Channel predistribution unit 93 is used to build N N matrix { Pi,j, Pi,jFor a pair of users (i, j) transmission power it
With；If a pair of real users are to being unsatisfactory for QoS restrictive conditions, Pi,jEqual to constant L1, L1More than two real users constitute complete
Maximum transmission power sum during duplex pair；If real user constitutes full duplex pair, P with Virtual Useri,jFor real user
Half-duplex power；If two Virtual User constitute full duplex pair, Pi,jEqual to constant L2, L2More than two real users constitute complete
Maximum transmission power sum during duplex pair；With the minimum target of total transmission power, obtain with matrix { Pi,jIt is utility matrix
The solution of Assignment Problems, and the configuration user access by control parameter of the solution.
When feasibility inspection unit 94 can not be accessed for there is user, the full duplex user couple where the user is rejected,
And obtain idle channel.
Allocation unit 95 is used in the real user that never accesses the user for choosing n power minimum with half pair to channel again
Work pattern is accessed, and n is the quantity of vacant channels.
In the present embodiment, user is divided into real user and Virtual User, true uplink user number and true downlink user
Number each means the quantity of real user.
Performance evaluation
In order to evaluate the performance of the present embodiment, to prove the performance of the access of the present embodiment federated user and power control scheme
Superiority, it is compared with random fit scheme, and by taking the following full-duplex/half-duplex hybrid network of technology scene as an example
Illustrate：
Radius of society is 0.1km, and base station is located at center of housing estate, and uplink user and downlink user number are respectively 10, uses
Family is randomly dispersed in cell.Path loss between user and base station is 128.1+37.6log (d (km))；Between user and user
Path loss be 148+40log (d (km)).The minimum data rate of uplink user and downlink user is 2.0bit/s/Hz.
Under conditions of accessing user's number is equal, comparing result is as shown in Figure 4：
(1) performance of algorithm 1 in the present embodiment is particularly less in channel number considerably beyond random fit scheme
In the case of, the transmission power needed for algorithm 1 is much smaller than the transmission power needed for random fit scheme.
(2) when channel number gradually increases, algorithm 1 and the performance gap of random fit scheme are less and less, work as channel
When number is 20, transmission power needed for both is identical, now, and all users are in semiduplex mode, and transmission power also with
Self-interference coefficient is unrelated.
The preferred embodiment of the present invention is the foregoing is only, is not intended to limit the invention, all spirit in the present invention
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (10)
1. a kind of user access control method for mixing full duplex half-duplex network, comprises the following steps：
Initialization step, increase (N-K) individual virtual uplink user and (N-M) individual virtual downlink user, K are true uplink user
Number, M is true downlink user number, and N is the number of channel；
Channel pre-allocates step, builds N N matrix { Pi,j, Pi,jFor the transmission power sum of a pair of users (i, j)；If a pair
Real user is to being unsatisfactory for QoS restrictive conditions, then Pi,jEqual to constant L1, L1During more than two real users composition full duplexs pair
Maximum transmission power sum；If real user constitutes full duplex pair, P with Virtual Useri,jFor the half-duplex work(of real user
Rate；If two Virtual User constitute full duplex pair, Pi,jEqual to constant L2, L2When more than two real users constitute full duplex pair
Maximum transmission power sum；With the minimum target of total transmission power, obtain with matrix { Pi,jBe utility matrix Assignment Problems
Solution, and by control parameter of the solution configure user access；
Feasibility checking step, if there is user not access, rejects the full duplex user couple where the user, obtains idle letter
Road；
The user that n power minimum is chosen in channel allocation step again, the real user never accessed connects in a half duplex mode
Enter, n is the quantity of vacant channels.
2. user access control method according to claim 1, it is characterised in that L2＞ L1。
3. user access control method according to claim 1, it is characterised in that the QoS restrictive conditions are：
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Wherein,It is the minimum data rate requirement of uplink user,It is the minimum data rate requirement of downlink user,
For the speed of uplink user,For the speed of downlink user, a is outage probability.
4. user access control method according to claim 3, it is characterised in that：
If a pair of real users are to being unsatisfactory forThen Pi,j=L1；
Wherein, η is self-interference rain scavenging coefficient,For the average channel power gain of uplink user,For being averaged for downlink user
Channel power gain,For the average channel power gain between uplink user and downlink user.
5. user access control method according to claim 4, it is characterised in that the full duplex that a pair of real users are constituted
To power sum
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<mo>)</mo>
</mrow>
<msubsup>
<mi>&eta;&sigma;</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>j</mi>
</mrow>
<mn>2</mn>
</msubsup>
<mo>-</mo>
<mn>4</mn>
<mi>a</mi>
<mi>l</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mi>a</mi>
<mo>)</mo>
</mrow>
<msubsup>
<mi>&sigma;</mi>
<mi>i</mi>
<mn>2</mn>
</msubsup>
<msubsup>
<mi>&sigma;</mi>
<mi>j</mi>
<mn>2</mn>
</msubsup>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
Wherein,For the noise power of up-link,For the noise power of downlink.
6. user access control method according to claim 1, it is characterised in that the acquisition is with matrix { Pi,jIt is effect
The step of with the solution of the Assignment Problems of matrix, includes：
The solution of the Assignment Problems is obtained using K-M algorithms.
7. the user access control method according to any one of claim 1 to 6 claim, it is characterised in that：
When base station is in full-duplex mode, the speed of uplink user isThe speed of downlink user
Rate is
Wherein,Transmission power when being matched for uplink user with downlink user,When being matched for downlink user with uplink user
Transmission power,To be the noise power of up-link,For the noise power of downlink,For the letter of uplink user
Road gain,For the channel gain of downlink user, hi,jIt is the gain of the interference channel between uplink user and downlink user, η is certainly
Disturb rain scavenging coefficient；
When base station is in semiduplex mode, the speed of uplink user isThe speed at the family of downlink user
Rate is
Wherein, Pi UFor the transmission power of uplink user,For the transmission power of downlink user.
8. the user access control method according to any one of claim 1 to 6 claim, it is characterised in that also include
Preposition anticipation step：
If M+K≤N, true uplink user is accessed in a half duplex mode with true downlink user, otherwise carries out initialization step
Suddenly.
9. a kind of user access control device for mixing full duplex half-duplex network, it is characterised in that including：
Initialization unit, for increasing (N-K) individual virtual uplink user and (N-M) individual virtual downlink user, K is true up use
Amount, M is true downlink user number, and N is the number of channel；
Channel pre-allocates unit, for building N N matrix { Pi,j, Pi,jFor the transmission power sum of a pair of users (i, j)；If
A pair of real users are to being unsatisfactory for QoS restrictive conditions, then Pi,jEqual to constant L1, L1More than two real users constitute full duplex pair
When maximum transmission power sum；If real user constitutes full duplex pair, P with Virtual Useri,jFor the half-duplex of real user
Power；If two Virtual User constitute full duplex pair, Pi,jEqual to constant L2, L2More than two real users constitute full duplex pair
When maximum transmission power sum；With the minimum target of total transmission power, obtain with matrix { Pi,jAsked for the appointment of utility matrix
The solution of topic, and the configuration user access by control parameter of the solution；
Feasibility inspection unit, when can not be accessed for there is user, rejects the full duplex user couple where the user, and obtain
Idle channel；
Channel allocation unit again, for choosing the user of n power minimum in the real user that never accesses with half-duplex mould
Formula is accessed, and n is the quantity of vacant channels.
10. user access control device according to claim 9, it is characterised in that L2＞ L1。
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