CN105323823A - Admission control mechanism with multiple quality assurance in broadband radio access network - Google Patents
Admission control mechanism with multiple quality assurance in broadband radio access network Download PDFInfo
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- CN105323823A CN105323823A CN201510613670.5A CN201510613670A CN105323823A CN 105323823 A CN105323823 A CN 105323823A CN 201510613670 A CN201510613670 A CN 201510613670A CN 105323823 A CN105323823 A CN 105323823A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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Abstract
The invention provides an admission control mechanism with multiple quality assurance applied in a broadband radio access network, so as to guarantee that the bandwidth and time delay of an admitted business are satisfied simultaneously, and the highest radio resource utilization rate and customer satisfaction can be reached. The method comprises the following steps: providing an adaptive resource allocation algorithm for an OFDMA (Orthogonal Frequency Division Multiple Access) system based on a maximum channel capacity and a multiuser diversity, and allocating a channel for every user and guaranteeing that the radio resource utilization rate is highest; providing an optimal bandwidth allocation model of different businesses of a user based on a customer satisfaction function, so as to provide the classified business bandwidth resource reservation of the highest customer satisfaction; and on the basis of the above two steps, taking an effective bandwidth compositing the parameters like bandwidth, time delay and package loss probability as an admission criterion, determining whether to admit the requested business according to the relationship between the sum of the effective bandwidth of the previous business of the user and the effective bandwidth of an arriving business and a reservation bandwidth of the previous business. The admission control mechanism with multiple quality assurance in the broadband radio access network provided by the invention can guarantee the resource utilization rate, customer satisfaction and business multiple quality simultaneously.
Description
Technical field
The present invention relates to wireless access technology field, particularly a kind of have multiple quality guarantee and the acceptance controlling method of high resource utilization.
Background technology
The carrier class multimedia service providing multiple qualities such as having bandwidth, time delay, packet loss to ensure in broadband radio access network is more and more general, and this brings challenge to the quality assurance mechanism of broadband radio access network.
Call access control is one of quality assurance mechanism of broadband radio access network, and current wireless admission control mechanism exists following problem:
By comparing cell resource with arrive certain single quality index requirement of business, as one of bandwidth, time delay, packet loss, determine whether admission service can only provide single quality assurance; In admission service process, not having according to channel condition is each user's distributing radio resource adaptively, and static mechanism causes resource utilization low; Not according to operation quality requirement and user's impression, be all kinds of business bandwidth reserved adaptively; The resource units of call access control or be user resources, or be the average all kinds of service resources of the whole network, fully can not ensure Consumer's Experience.
In fact, current broadband radio access network provides more and more has bandwidth, time delay, the carrier class multimedia service that the multiple qualities such as packet loss ensure, need multiple quality to be guaranteed simultaneously, it is in physical layer many employings OFDMA technology, utilize multi-user diversity technology can distributing radio resource ensure fairness and bit error rate requirement between channel capacity maximum and user between each user easily, simultaneously, for the inhomogeneity traffic assignments subcarrier of each user, i.e. bandwidth reserved, and ensure that user satisfaction is maximum, this makes the resource in call access control provide can user or Business Stream be not only unit, and can in units of the Business Stream of user, the basic technology of existing broadband radio access network can be that multiple quality ensures, resource utilization, user satisfaction is improved simultaneously.
Therefore, develop a kind of carrier class multimedia service that can adapt to transmit in broadband radio access network the multiple qualities such as there is bandwidth, time delay, packet loss guarantee and become the technical problem being badly in need of solving.
Summary of the invention
In order to adapt to transmission in broadband radio access network, there is the carrier class multimedia service of the multiple quality guarantees such as bandwidth, time delay, packet loss, the present invention proposes a kind of technical scheme with the call access control that multiple quality ensures in broadband radio access network, and described scheme is as follows:
Have the acceptance controlling method that multiple quality ensures, the method is applied in broadband radio access network,
(1) application module in subscriber station SS sends to the admission control cell in base station BS the request of connecting, and contains the traffic contract of application in described connection request;
(2) admission control cell in BS accepts or refuses described connection request;
Specify in wherein said call access control rule Unsolicited Grant Service UGS, real-time query rtPS, non real-time inquiry nrtPS, Best-Effort service BE priority reduce successively;
For the UGS of each user, when reserved resource is greater than effective bandwidth needed for arrival business and such business has distributed bandwidth sum, then receive, otherwise, bandwidth is adopted to lend mechanism, in this system of taking this opportunity, if when the shared band of BE business is wider than 10%, lend to UGS, otherwise, refusal;
For the rtPS of each user, when reserved resource is greater than effective bandwidth needed for arrival business and such business has distributed bandwidth sum, then receive, otherwise, bandwidth is adopted to lend mechanism, in this system of taking this opportunity, if when the shared band of BE business is wider than 10%, lend to rtPS, otherwise, refusal;
For the nrtPS of each user, when reserved resource is greater than effective bandwidth needed for arrival business and such business has distributed bandwidth sum, then receive, otherwise, bandwidth is adopted to lend mechanism, in this system of taking this opportunity, if when the shared band of BE business is wider than 10%, lend to nrtPS, otherwise, refusal;
(3) if the described admission control cell in BS receives described connection request, then notify the uplink data scheduling device UPS unit of BS side, information module in described UPS unit is dispatched according to the bandwidth request message received, and upgrades dispatching database;
(4) Extracting Information generate UL-MAP message from described dispatching database of the service distribution module in described UPS unit;
(5) BS broadcasts UL-MAP message to all SS in descending sub frame;
(6) scheduling unit of SS side is according to the UL-MAP message extraction packet received, and sends;
In this acceptance controlling method, adopt the effective bandwidth combining bandwidth, time delay and packet loss as call access control standard, and have employed the resource units of all kinds of business bandwidth reserveds as call access control of each user.
Preferably, the step of described generation bandwidth request comprises:
Multilayer self-adjusted block is carried out to Internet resources, maximize and multi-user diversity principle according to channel capacity, under power limited, user fairness and error rate confined condition, set up non-linear Integer programme model, after decoupling zero sub carries allocation and power division, greedy theorem and Lagrangian rule is adopted to try to achieve each user according to the modulation system on the available total resources of service request and each subcarrier of OFDM;
The user satisfaction function of this 4 class business of definition UGS, rtPS, nrtPS, BE, sets up the allocated bandwidth Optimized model that user satisfaction is maximum, adopts Lagrangian rule to merge Taylor expansion, the bandwidth that all kinds of business of trying to achieve each user can be divided.
Have employed an acceptance control system for acceptance controlling method, this system comprises subscriber station SS and base station BS, it is characterized in that:
Described SS by applying unit, link sort unit, Unsolicited Grant Service UGS, real-time query rtPS, non real-time inquiry nrtPS and Best-Effort service BE unit, scheduling unit form;
Described BS is by admission control cell, and uplink data scheduling device UPS unit forms, and wherein said UPS unit comprises information module, scheduler module and service distribution module.
In technique scheme, to maximize based on channel capacity and multi-user diversity carries out adaptive population to OFDMA system, ensure the highest and user fairness of wireless resource utility efficiency for each user's allocated channel; The optimization bandwidth allocation model of the inhomogeneity business of user is provided based on user satisfaction function, and adopts Taylor expansion to solve, reserve to provide classify traffic bandwidth resources with the greatest satisfiction by user; On the two basis, to combine bandwidth, time delay, the isoparametric effective bandwidth of packet loss for Admission Criterion, according to effective bandwidth and the relation arriving the effective bandwidth sum of business and the bandwidth reserved of such business of user's such business existing, determine whether the business of receiving request, this mechanism can make resource utilization, user satisfaction, business multiple quality be guaranteed simultaneously.
Accompanying drawing explanation
Fig. 1 is the QoS block schematic illustration of IEEE802.16d/e agreement;
Each user's subcarrier-modulated pattern diagram when Fig. 2 is mean allocation subcarrier;
Each user's subcarrier-modulated pattern diagram when Fig. 3 distributes for optimizing;
Fig. 4 is that user satisfaction is with rtPS bandwidth threshold change schematic diagram;
Fig. 5 is that the Business Stream that mean allocation and self-adjusted block subcarrier are received when effective bandwidth is receiving standard compares schematic diagram;
Fig. 6 is the system of self-adjusted block subcarrier, and the Business Stream received when Mean Speed, effective bandwidth, optimization thresholding are receiving standard respectively compares schematic diagram;
Fig. 7 is the system of self-adjusted block subcarrier, and the voice flow received when Mean Speed, effective bandwidth, optimization thresholding are receiving standard respectively compares schematic diagram;
The system of Fig. 8 self-adjusted block subcarrier, the video flowing received when Mean Speed, effective bandwidth, optimization thresholding are receiving standard respectively compares schematic diagram;
Fig. 9 is that 20 rtPS arrive the schematic diagram flowing the packet delay respectively under average arrival rate and effective bandwidth are received and compare;
Figure 10 is the flow chart of this acceptance controlling method.
Embodiment
Below in conjunction with drawings and Examples, detailed specific description is done to the multi-view angle three-dimensional imager based on line laser structured light of the present invention.
Have the carrier class multimedia service of the multiple quality guarantees such as bandwidth, time delay, packet loss to adapt to transmission in broadband radio access network, the present invention proposes a kind of admission control mechanism having multiple quality and ensure in broadband radio access network.Described scheme is as follows:
To maximize based on channel capacity and multi-user diversity is carried and encircleed OFDMA system adaptive population algorithm, ensure that wireless resource utility efficiency is the highest for each user's allocated channel.
The optimization bandwidth allocation model of the inhomogeneity business of user is provided based on user satisfaction function, and adopts Taylor expansion to solve, reserve to provide classify traffic bandwidth resources with the greatest satisfiction by user.
Definition combines bandwidth, time delay, the isoparametric effective bandwidth of packet loss, and with for Admission Criterion, according to effective bandwidth and the relation arriving the effective bandwidth sum of business and the bandwidth reserved of such business of user's such business existing, determine whether the business of receiving request, this mechanism can make resource utilization, user satisfaction, business multiple quality be guaranteed simultaneously.
Call access control process and device
Wherein, described " to maximize based on channel capacity and multi-user diversity is carried and encircleed OFDMA system adaptive population algorithm, for each user resource allocation and ensure that wireless resource utility efficiency is the highest ", specifically comprises
For OFDMA system, under the condition of multi-user diversity, do to suppose as follows:
K is user's collection, K={1,2,3K}.
.
for subcarrier collection,
C
k,nfor user k uses the instruction of subcarrier n, and if only if when subcarrier n distributes to user k, c
k,n=1
P
k,nthe power of the subcarrier n distributing to user k
G
k,nbe the gain of user k on subcarrier n, corresponding sub-carrier signal-noise ratio is expressed as
the received signal to noise ratio of user k on subcarrier n is γ
k,n=h
k,np
k,n.
M is the modulating mode of MQAM
For the MQAM adopting Gray to map, when bit error rate BER≤10
-3time, the pass of bit error rate and signal to noise ratio is
Make Γ=-ln (5BER)/1.6, H
k,n=h
k,n/ Γ, on subcarrier, speed and signal power and channel status close and are:
The speed of user k on subcarrier n is
Assuming that OFDM symbol is by the transmission of frequency selectivity Rayleigh slow fading channel, transmission bandwidth is B, assuming that the decline of each user experience is independent, then maximize system capacity Optimized model is
Be limited to:
Wherein, φ
ifor normalization proportionality constant,
condition C 3 illustrates that each subcarrier can only by a CU once, and condition C 4 illustrates total transmit power limited, and condition C 5 requires that Resourse Distribute meets each customer service ratio of request.
The bandwidth that user k is finally allocated to is R
k:
Solving for Optimized model, employing decoupling method solves: the first step: user's sub carries allocation, according to greedy theorem, simultaneously in order to ensure user fairness, the channel at every turn allowing the user with minimum scale capacity select gain maximum ensures maximum percent of pass and fairness, second step: sub-carrier power and bit distribute, after determining sub carries allocation, under power-limited condition, Optimized model is simplified, and adopts Lagrangian rule to solve.
According to the above-mentioned first step, adopt loop iteration method to realize, concrete steps are:
A () makes
(b)fork＝1toK
N
k＝N
k+1；
(c)
According to above-mentioned second step implementation method for: after the subcarrier had as user is determined, Optimized model is reduced to:
Be limited to:
Adopt Lagrangian rule, as follows to above-mentioned model solution result:
Wherein,
And if only if P
k> V
k, above formula just has solution, if this condition does not meet, then upgrades sub carries allocation.
Power on subcarrier is:
Speed on subcarrier is:
Wherein, described " provide the optimization bandwidth allocation model of the inhomogeneity business of user based on user satisfaction function, and adopt Taylor expansion to solve, reserve to provide classify traffic bandwidth resources with the greatest satisfiction by user ", specifically comprises
The user satisfaction function of definition UGS (Unsolicited Grant Service) and BE (Best-Effort service) is respectively:
The user satisfaction of definition rtPS (real-time query) and nrtPS (non real-time inquiry) is respectively:
Wherein, r
i, r
i req, D
ibe respectively bandwidth that this traffic assignments arrives, bandwidth on demand, in the time delay of distributing under bandwidth and qos requirement time delay, when the time delay of rtPS and nrtPS and bandwidth meet the demands, its extent function is more than or equal to 1/2 respectively, and sum of the two is more than or equal to 1.
Assuming that bandwidth is distributed completely, the service bandwidth Distribution Optimization Model of structuring user's Maximum Satisfaction is as follows:
Wherein, Ω
uGS, Ω
rtPS, Ω
nrtPS, Ω
bErepresent the connection belonging to UGS, rtPS, nrtPS, BE respectively, R is total bandwidth.Condition C 1 represents that UGS business is by request dispatching bandwidth, BE traffic assignments bandwidth is no more than 10% of total bandwidth, condition C 2 represents rtPS palpus guarantee delay requirement and nrtPS must ensure bandwidth requirement, C3 represents that total bandwidth limits, C4 represents UGS, the bandwidth threshold of BE business, simultaneously, also UGS is described, the allocated bandwidth of BE business and rtPS, nrtPS is independent, therefore, this optimization problem becomes and is eliminating UGS, BE service bandwidth, under the condition that residue total bandwidth is certain, find rational rtPS, the bandwidth threshold of nrtPS, make user satisfaction the highest, and meet qos requirement.
Above-mentioned optimization problem: for simplifying the analysis, assuming that in each station, all rtPS and all nrtPS have identical QoS request, under identical allocated bandwidth, have identical time delay and bandwidth feature, assuming that rtPS and nrtPS linking number is identical in system, then optimization problem can be reduced to:
Wherein, M is rtPS maximum number of connections.
Above-mentioned optimization problem, adopts Lagrangian rule:
Wherein, R
0for cutting the bandwidth after UGS, BE business
Above-mentioned optimization problem, in order to simplify, ignore propagation delay time, only consider queuing delay, assuming that queue endless, arrives as intensity is λ Poisson distribution, the exponential distribution of service time, to be intensity be μ, and λ < μ, then average queuing delay is:
Wherein,
l
i, rtPSfor the bag of rtPS is long.User satisfaction is obtained as Taylor expansion:
Above-mentioned optimization problem, by
can obtain:
Wherein, the maximum of M is:
The bandwidth optimization thresholding of rtPS is: M × r
i, rtPS
Wherein, described " definition combines bandwidth, time delay, the isoparametric effective bandwidth of packet loss; and with for Admission Criterion; according to the effective bandwidth of user's such business existing with arrive the relation of the effective bandwidth sum of business with the bandwidth reserved of such business; determine whether to receive the business of asking; this mechanism can make resource utilization, user satisfaction, business multiple quality be guaranteed simultaneously ", specifically comprise:
Entropy Function Method definition effective bandwidth: assuming that the arrival rate of a class business and queue are respectively α (t), q (t), channel capacity is c, and team leader is unlimited.Then queue length meets:
The arrival process of business is analogized to the Particles Moving of statistical mechanics, A (0, t) to be initial condition be 0 accumulation arrive data volume, to arrival process A (0, t), define its energy function:
Corresponding entropy function is:
Entropy function also can so calculate:
Then by statistical mechanics and large skew theory, can to obtain t Particle velocity be α probability density function is:
Wherein, Λ
*(α) be process A (0, entropy function t).Have capacity c, the rear of queue being limited to the data source of energy Λ (θ) is distributed as
through conversion, can obtain:
wherein, θ
*for
unique solution.
The effective bandwidth function of definition data source:
The effective bandwidth of business is relevant with to expression patterns, and when θ → 0, effective bandwidth levels off to Mean Speed, during θ → ∞, then close to peak rate.
The relation of effective bandwidth and other qos parameters: (1) effective bandwidth and packet loss: if known arrival process A (0, t), queue length x, channel capacity is c, then packet loss can be determined, conversely, if arrive known arrival process A (0, t) and required packet loss be p, then by calculating θ
*, thus calculate Λ (θ), finally calculate the effective bandwidth of satisfied certain packet loss.(2) effective bandwidth and time delay: P (D (t) > D
max)=exp (-θ
*cD
max)
The linear computational method of effective bandwidth: to MARKOV stream, state transitions rate matrix is Q, Λ=diag (λ
1, λ
2λ
s), λ
sfor the arrival rate of corresponding state s, order: z=-θ
*(wherein, θ
*for
solution)
Order
then the maximum factual investigation of A (z) is the effective bandwidth meeting packet loss or time delay.
The effective bandwidth of four kinds of business
1. couple UGS, assuming that bag arrival rate perseverance is λ,
α
λ(θ)＝λ
2. other types business, can regard as intensity is the memoryless Poisson source of λ,
α
P(θ)＝λ(e
θ-1)/θ
Wherein, described call access control process is:
(1) application of SS sends request to BS, connects, and contains the traffic contract of application in a connection request.
(2) the call access control module of BS accepts or refusal connection.
(3), after call access control module receives new connection, the UPS module of notice BS side, the information module of UPS, according to the bandwidth request message of collecting, is dispatched, and is upgraded dispatching database.
(4) service distribution module Extracting Information generate UL-MAP message from dispatching database.
(5) BS broadcasts UL-MAP message to all SS in descending sub frame.
(6) scheduler of SS side sends according to the UL-MAP message extraction grouping received.
Protection scope of the present invention is not limited to the above embodiments, and obviously, those skilled in the art can carry out various change and distortion to the present invention and not depart from the scope of the present invention and spirit.If these are changed and distortion belongs in the scope of the claims in the present invention and equivalent technologies thereof, then the intent of the present invention also comprises these changes and distortion.
Claims (3)
1. have the acceptance controlling method that multiple quality ensures, the method is applied in broadband radio access network, it is characterized in that:
(1) application module in subscriber station SS sends to the admission control cell in base station BS the request of connecting, and contains the traffic contract of application in described connection request;
(2) admission control cell in BS accepts or refuses described connection request; Admission Criterion is:
For the UGS of each user, when reserved resource is greater than effective bandwidth needed for arrival business and such business has distributed bandwidth sum, then receive, otherwise, bandwidth is adopted to lend mechanism, in this system of taking this opportunity, if when the shared band of BE business is wider than 10%, lend to UGS, otherwise, refusal;
For the rtPS of each user, when reserved resource is greater than effective bandwidth needed for arrival business and such business has distributed bandwidth sum, then receive, otherwise, bandwidth is adopted to lend mechanism, in this system of taking this opportunity, if when the shared band of BE business is wider than 10%, lend to rtPS, otherwise, refusal;
For the nrtPS of each user, when reserved resource is greater than effective bandwidth needed for arrival business and such business has distributed bandwidth sum, then receive, otherwise, bandwidth is adopted to lend mechanism, in this system of taking this opportunity, if when the shared band of BE business is wider than 10%, lend to nrtPS, otherwise, refusal;
(3) if the described admission control cell in BS receives described connection request, then notify the ascending grouping scheduling device UPS unit of BS side, the information module in described UPS unit is dispatched according to the bandwidth request message received, and upgrades dispatching database;
(4) Extracting Information generate UL-MAP message from described dispatching database of the service distribution module in described UPS unit;
(5) BS broadcasts UL-MAP message to all SS in descending sub frame;
(6) scheduling unit of SS side is according to the UL-MAP message extraction packet received, and sends;
Specify in wherein said call access control rule Unsolicited Grant Service UGS, real-time query rtPS, non real-time inquiry nrtPS, Best-Effort service BE priority reduce successively;
In this acceptance controlling method, adopt the effective bandwidth combining bandwidth, time delay and packet loss as call access control standard, and have employed the resource units of all kinds of business bandwidth reserveds as call access control of each user.
2. require described acceptance controlling method according to right 1, it is characterized in that the step of described generation bandwidth request comprises:
Multilayer self-adjusted block is carried out to Internet resources, maximize and multi-user diversity principle according to channel capacity, under power limited, user fairness and error rate confined condition, set up non-linear Integer programme model, after decoupling zero sub carries allocation and power division, greedy theorem and Lagrangian rule is adopted to try to achieve each user according to the modulation system on the available total resources of service request and each subcarrier of OFDM;
The user satisfaction function of this 4 class business of definition UGS, rtPS, nrtPS, BE, sets up the allocated bandwidth Optimized model that user satisfaction is maximum, adopts Lagrangian rule to merge Taylor expansion, the bandwidth that all kinds of business of trying to achieve each user can be divided.
3. have employed the acceptance control system as the acceptance controlling method as described in arbitrary in claim 1-2, this system comprises subscriber station SS and base station BS, it is characterized in that:
Described SS by applying unit, link sort unit, Unsolicited Grant Service UGS, real-time query rtPS, non real-time inquiry nrtPS and Best-Effort service BE unit, scheduling unit form;
Described BS is by admission control cell, and uplink data scheduling device UPS unit forms, and wherein said UPS unit comprises information module, scheduler module and service distribution module.
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2015
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| CN1197708A (en) * | 1998-03-03 | 1998-11-04 | 浙江大学 | Preparation of nanometer silver-copper alloy powder |
| CN101282324A (en) * | 2008-04-25 | 2008-10-08 | 北京交通大学 | Method for managing combined wireless resource of self-adaption MIMO-OFDM system based on across layer |
| CN103619069A (en) * | 2013-12-09 | 2014-03-05 | 华北电力大学 | Broadband power line communication cross-layer resource allocation method with prior hybrid service emergency degree |
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