Applications for 802.16-2004 and 802.16e WiMAX Networks Final
Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support
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Transcript of Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support
![Page 1: Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support](https://reader036.fdocuments.net/reader036/viewer/2022081519/568132e3550346895d999e78/html5/thumbnails/1.jpg)
1
LOGO
Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support
Speaker: 黃筱婷指導教授 : 柯開維 教授Date: 2011/05/23
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2
Outline
IntroductionProposed Bandwidth Guaranteed
CAC SchemeAnalytical ModelNumerical ResultsConclusionFuture WorkReference
![Page 3: Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support](https://reader036.fdocuments.net/reader036/viewer/2022081519/568132e3550346895d999e78/html5/thumbnails/3.jpg)
3
Introduction
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QoS Architecture for IEEE 802.16 MAC Protocol
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QoS Classes
QoS Category Application QoS Specification
UGSUnsolicited Grant
Service
T1/E1 Transport
•Maximum Sustained Rate•Maximum Latency Tolerate•Jitter Tolerance
rtPSReal-Time Polling
ServiceVoIP
•Minimum Reserved Rate•Maximum Sustained Rate•Maximum Latency Tolerate•Traffic Priority
ErtPSExtended Real-Time
Polling ServiceMPEG Video
•Minimum Reserved Rate•Maximum Sustained Rate•Maximum Latency Tolerate•Jitter Tolerance•Traffic Priority
nrtPSNon-Real-Time Polling
ServiceFTP
•Minimum Reserved Rate•Maximum Sustained Rate•Traffic Priority
BEBest-Effort Service HTTP •Maximum Sustained Rate
•Traffic Priority
priority
高
低
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Motivation[2] 提了一個 Bandwidth and Delay
Guaranteed CAC scheme ,利用 [3] 提出的公式
,計算出 rtPS 的 delay 後再依據所需頻寬大小判斷是否需降階,決定是否能接收此連線。
優點:此方法有考慮到 delay 與 handoff 的狀況缺點:一次將整個 class 的所有連線都降一階,會
讓系統的 utilization 下降,容易造成浪費的情況。所以我們提出了要一個一個降的並加入 recovery
的方法,希望能大幅增加 utilization 。
frCCmb irtPSNRTii )]1/1)(1[(
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Motivation(cont.)
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Outline
IntroductionProposed Bandwidth Guaranteed
CAC SchemeAnalytical ModelNumerical ResultsConclusionFuture WorkReference
![Page 9: Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support](https://reader036.fdocuments.net/reader036/viewer/2022081519/568132e3550346895d999e78/html5/thumbnails/9.jpg)
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Proposed CAC SchemeH:Handoff, N:New callPriority: H-UGS>H-rtPS>N-UGS>N-rtPS >H-nrtPS>N-nrtPS
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Degradation1
(UGS,rtPS1,rtPS2,rtPS3,nrtPS1,
nrtPS2,nrtPS3)使用於有 New Call
UGS/rtPS 與Handoff nrtPS 連線想要進來的時候
可以讓 nrtPS 的連線降階,盡量讓提出要求的連線都能進來
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11
Degradation2
(UGS,rtPS1, rtPS2,rtPS3,nrtPS1, nrtPS2,nrtPS3)使用於有 Handoff
UGS 與 Handoff rtPS連線想要進來的時候
可以讓 nrtPS 與 rtPS的連線降階,盡量讓提出要求的連線都能進來
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Recovery
(UGS,rtPS1, rtPS2,rtPS3, nrtPS1,nrtPS2, nrtPS3)使用於有連線要離
開的時候盡量把頻寬用完使
得 Utilization 能夠提高
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Handoff UGS Connection
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New Call UGS Connection
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Handoff rtPS Connection
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New Call rtPS Connection
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Handoff nrtPS Connection
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New Call nrtPS Connection
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19
Outline
IntroductionProposed Bandwidth Guaranteed
CAC SchemeAnalytical ModelNumerical ResultsConclusionFuture WorkReference
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Analytical Model
Continuous Time Markov Chain Model (i, j, k, l, m, p, q) = (UGS, rtPS1, rtPS2, rtPS3, nrtPS1,
nrtPS2, nrtPS3) 的連線數 (b1, b2, b3, b4, b5, b6, b7) = (UGS, rtPS1, rtPS2,
rtPS3, nrtPS1, nrtPS2, nrtPS3) 之可使用的頻寬大小 Δr = b2 - b3 = b3 – b4 Δn = b5 – b6 = b6 – b7 (b1, b2, b3, b4, b5, b6, b7) 又可表示成 (b1, 3Δr, 2Δr, Δr, 3Δn, 2Δn, Δn) C = 在 BS 中可讓連線使用的頻寬總量 (Mbps)
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Analytical Model(cont.)
Arrival process of the handoff and new call UGS, rtPS, and nrtPS connections is Poisson with λhu, λhr, λhn, λnu, λnr, λnn, and λT = λhu+λhr+λhn+λnu+λnr+λnn
The service time of UGS, rtPS and nrtPS connection are exponentially distributed with mean 1/μu, 1/μr1, 1/μr2, 1/μr3, 1/μn1, 1/μn2, 1/μn3
steady state prob. of the state s=(i, j, k, l, m, p, q) is represented by π(i, j, k, l, m, p, q)
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State Transition Rate of the Markov Chain
Current State Transition Rate Next State
(i,j,k,l,m,p,q)
λhu (i+1,j’,k’,l’,m’,p’,q’)
λnu (i+1,j,k,l,m’,p’,q’)
λhr (i,j’+1,k’,l’,m’,p’,q’)
λnr (i,j+1,k,l,m’,p’,q’)
λhr (i,j’,k’+1,l’,m’,p’,q’)
λnr (i,j,k+1,l,m’,p’,q’)
λhr (i,j’,k’,l’+1,m’,p’,q’)
λnr (i,j,k,l+1,m’,p’,q’)
λhn (i,j,k,l,m’+1,p’,q’)
λnn (i,j,k,l,m+1,p,q)
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State Transition Rate of the Markov Chain(cont.)
Current State Transition Rate Next State
(i,j,k,l,m,p,q)
λhn (i,j,k,l,m’,p’+1,q’)
λnn (i,j,k,l,m,p+1,q)
λhn (i,j,k,l,m’,p’,q’+1)
λnn (i,j,k,l,m,p,q+1)
i . μu (i-1,j’,k’,l’,m’,p’,q’)
j . μr1 (i,j’,k’,l’,m’,p’,q’)
k . μr2 (i,j’,k’,l’,m’,p’,q’)
l . μr3 (i,j’,k’,l’,m’,p’,q’)
m . μn1 (i,j’,k’,l’,m’,p’,q’)
p . μn2 (i,j’,k’,l’,m’,p’,q’)
q . μn3 (i,j’,k’,l’,m’,p’,q’)
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24
Analytical Model
}7654321
|,,,,,,{
Cbqbpbmblbkbjbi
qpmlkjisS
State Space
normalized condition
Bandwidth Utilization(%)
Ss
qpmlkji 1),,,,,,(
istateforbqbjbiCiC
CU Ss
ii
,7...21 ,
![Page 25: Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support](https://reader036.fdocuments.net/reader036/viewer/2022081519/568132e3550346895d999e78/html5/thumbnails/25.jpg)
25
Handoff Connection Dropping Probability
the Prob. of rejecting a handoff connection request for admission into the network.
)}1()2()2(|),,,,,,({
, _'
),,,,,,(
Rbpmkjqpmlkjis
SwhereDP
nr
UGSDPSs
qpmlkjiUGS
)}4()2()2(|),,,,,,({
, _'
),,,,,,(
Rbpmkjqpmlkjis
SwhereDP
nr
rtPSDPSs
qpmlkjirtPS
)}7()2(|),,,,,,({ _
'),,,,,,(
RbpmqpmlkjisSwhere
DP
nnrtPSDP
SsqpmlkjinrtPS
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26
New Connection Blocking Probability
The Prob. of rejecting a new connection request for admission into the network.
)}1()2(|),,,,,,({ _
'),,,,,,(
RbpmqpmlkjisSwhere
BP
nUGSBP
SsqpmlkjiUGS
)}4()2(|),,,,,,({ _
'),,,,,,(
RbpmqpmlkjisSwhere
BP
nrtPSBP
SsqpmlkjirtPS
)}7()6()5(|),,,,,,({
, _'
),,,,,,(
bRbRbRqpmlkjis
SwhereBP nrtPSBPSs
qpmlkjinrtPS
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27
Outline
IntroductionProposed Bandwidth Guaranteed
CAC SchemeAnalytical ModelNumerical ResultsConclusionFuture WorkReference
![Page 28: Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support](https://reader036.fdocuments.net/reader036/viewer/2022081519/568132e3550346895d999e78/html5/thumbnails/28.jpg)
28
System Parametertotal uplink capacity available at BS is
4096Kbps.QoS Parameter(UGS,rtPS1,rtPS2,rtPS3,nrtPS1,nrtPS2,nrtPS3)=(256,1023,682,341,1023,682,341)λhu = λnu = λhr= λnr= λhn= λnn
μu=μr1=μr2=μr3= μn1=μn2=μn3=0.2system load(ρ)
C
bii i
i
N
![Page 29: Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support](https://reader036.fdocuments.net/reader036/viewer/2022081519/568132e3550346895d999e78/html5/thumbnails/29.jpg)
29
Admission Control(UGS)
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30
Admission Control(rtPS)
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31
Admission Control(nrtPS)
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Utilization
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保留部分頻寬 recovery 時每次只升回部分頻寬,不要每次都把頻寬盡量用
完,這樣可以用來微調剩餘的保留頻寬大小,在 Utilization與 Blocking 間微調取得最適合現在網路環境的方法
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34
Outline
IntroductionProposed Bandwidth Guaranteed
CAC SchemeAnalytical ModelNumerical ResultsConclusionFuture WorkReference
![Page 35: Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support](https://reader036.fdocuments.net/reader036/viewer/2022081519/568132e3550346895d999e78/html5/thumbnails/35.jpg)
35
Conclusion
舉例:如右圖所示。(5,1,2,1,0,0,0) 為一個blocking state ,在只有降的時候 steady-state prob. = 0.0001973118 ,升 + 降時是 0.001406381 ,因此可得知在加入升的演算法的時候,跳到 blocking state 的機率增加,進而造成 blocking prob. 增加。
加入 recovery 的時候,由於 blocking state 的steady state prob. 變大,所以造成 blocking prob. 也跟著增加。
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36
Conclusion(cont.)
只有做 degradation 的時候, blocking prob. 有明顯的改進。
除了 degradation 之外再加上 recovery之後, utilization 大幅增加。
利用調整頻寬保留的比例來決定 blocking prob. 和 utilization 的大小,以適用於不同的網路環境。
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37
Future Work
找出合理的 C 與合適的 R 提升系統效能分析當 handoff 和 new call
connection 所佔比例不同時的結果。推導 rtPS 與 nrtPS 有 n 個 class 的
general form 。
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38
Reference
[1] IEEE Std 802.16-2009, “IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Broadband Wireless Access Systems,”May, 2009.
[2] K. Etemad, “Overview of Mobile WiMAX Technology and Evolution”, IEEE Communications Magazine, vol. 46(10), pp. 31-40, October 2008
[3] S. Kalikivayi, I.S. Misra, and K. Saha, “Bandwidth and Delay Guaranteed Call Admission Control Scheme for QOS Provisioning in IEEE 802.16e Mobile WiMAX,” IEEE conference on Global telecommunications, pp. 1-6, 2008.
[4] Kitti Wongthavarawat, and Aura Ganz, “Packet scheduling for QoS support in IEEE 802.16 broadband wireless access systems,” International Journal of Communication Systems, vol. 16, issue 1 , pp. 81-96, February 2003
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39
Thanks for your attention!
Q&A
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40
Balance Equation
)]}',',',,',',()',',',',',',(
)',',',,',',()',',',',',',()',',',,',',()',',',',',',([
)]',',',,',',()',',',',',',()',',',,',',()',',',',',',(
)',',',,',',()',',',',',',([)',',',,',',1()',',',',',',1(
)]1,,,,,,()1,,,,,,()1()1',',',,,,()1',',',,,,()1'[(
)],1,,,,,(),1,,,,,()1()',1',',,,,()',1',',,,,()1'[(
)],,1,,,,(),,1,,,,()1()',',1',,,,()',',1',,,,()1'[(
)]',',',1,,,()',',',1,,,()1()',',',1',',',()',',',1',',',()1'[(
)]',',',,1,,()',',',,1,,()1()',',',',1',',()',',',',1',',()1'[(
)]',',',,,1,()',',',,,1,()1()',',',',',1',()',',',',',1',()1'[(
)]',',',,,,1()',',',,,,1()',',',',',',1()',',',',',',1([)1{(
)]',',',,',',()',',',,',',()',',',,',',()',',',,',',(
)',',',,',',()',',',,',',()',',',,',',1(
)]1,,,,,,(),1,,,,,(),,1,,,,([
)]1',',',,,,()',1',',,,,()',',1',,,,([
)]',',',1,,,()',',',,1,,()',',',,,1,([
)]',',',1',',',()',',',',1',',()',',',',',1',([
)',',',,,,1()',',',',',',1()[,,,,,,(
33
2
1
3
2
1
3213
21
qpmlkjiqpmlkji
qpmlkjiqpmlkjiqpmlkjiqpmlkji
qpmlkjiqpmlkjiqpmlkjiqpmlkji
qpmlkjiqpmlkjiqpmlkjiqpmlkji
qpmlkjiqpmlkjiqqpmlkjiqpmlkjiq
qpmlkjiqpmlkjipqpmlkjiqpmlkjip
qpmlkjiqpmlkjimqpmlkjiqpmlkjim
qpmlkjiqpmlkjilqpmlkjiqpmlkjil
qpmlkjiqpmlkjikqpmlkjiqpmlkjik
qpmlkjiqpmlkjijqpmlkjiqpmlkjij
qpmlkjiqpmlkjiqpmlkjiqpmlkjii
qpmlkjiqqpmlkjipqpmlkjimqpmlkjil
qpmlkjikqpmlkjijqpmlkjii
qpmlkjiqpmlkjiqpmlkji
qpmlkjiqpmlkjiqpmlkji
qpmlkjiqpmlkjiqpmlkji
qpmlkjiqpmlkjiqpmlkji
qpmlkjiqpmlkjiqpmlkji
tn
trtu
nn
n
n
r
r
r
u
nnnr
rru
nn
hn
nr
hr
nuhu
![Page 41: Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support](https://reader036.fdocuments.net/reader036/viewer/2022081519/568132e3550346895d999e78/html5/thumbnails/41.jpg)
41
Balance Equation(cont.)
δ(i,j,k,l,m,p,q)
λtu
λtr
λtn
otherwise
Sqpmlkjiqpmlkji ,0
),,,,,,(,1),,,,,,(
otherwise
Cqbpbmblbkbjbbiif
hu
nuhutu ,
7654321)1(,
otherwise
Cqbpbmbblkbjbib
Cqbpbmblbbkjbib
Cqbpbmblbkbbjib
hr
nrhr
tr
,
]7654)1(321[
]76543)1(21[
]765432)1(1[ if,
otherwise
Cbqpbmblbkbjbib
Cqbbpmblbkbjbib
Cqbpbbmlbkbjbib
hn
nnhn
tn
,
]7)1(654321[
]76)1(54321[
]765)1(4321[ if,
![Page 42: Bandwidth Guaranteed Call Admission Control Scheme in IEEE 802.16 Mobile WiMAX with QoS Support](https://reader036.fdocuments.net/reader036/viewer/2022081519/568132e3550346895d999e78/html5/thumbnails/42.jpg)
42
Comparison(UGS)
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43
Comparison(rtPS)
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44
Comparison(nrtPS)