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ADAPTIVE POWER ALLOCATION AND
CALL ADMISSION CONTROL INMULTISERVICE WIMAX ACCESS NETWORKS
IEEE Wireless Communications February 2007
Radio Resource Management And Protocol
Engineering For IEEE 802.16
Reporter
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Outline
1. Abstract
2. Introduction
3. Wimax Downlink APA Optimization
4. Deploying CAC In Wimax Access Networks
5. The Cooperation Between APA and CAC
6. Conclusions
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Abstract
From a technical viewpoint, WiMAX is a feasiblealternative to the wired internet accesssolutions such as cable modem and DSL
From the commercial viewpoint, whether thepromise of WiMAX will be materialized stilldepends on its revenue rate to telecomoperators and its service quality to the
subscribers
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Introduction
The choice of broadband Internet access
T1ADSLCABLE
However, these wired infrastructures can be considerablymore expensive and time consuming to deploy than
wireless ones
WiMAX, an IEEE 802.16 standardized wireless technology
10Km
single-channel data rate of up to 75 Mb/s on both the uplink anddownlink.
use multiple WiMAX channels for a single transmission to reach abandwidth of up to 350 Mb/s.
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Introduction
WiMAX technology supports both mesh andpoint-to-multipoint (PMP) networks.
mesh network is usually used forconstructing wide-area wireless backhaulnetwork
PMP network aims at providing the last-mileaccess to a broadband ISP.
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Introduction
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Introduction
Click to edit Master text stylesSecond level
Third level Fourth level Fifth level
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Introduction
Transmission
OFDM (orthogonal frequency division multiplexing)
OFDMA (orthogonal frequency division multiple
access)
Duplex
FDD (Frequency Division Duplex)
TDD (Time Division Duplex)
TDD is more flexible
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Introduction
As one of the most expected features,WiMAX is supposed to have the capability ofaccommodating a variety of traffics,including data transfer, voice, and video.
WiMAX Forum define
Unsolicited Grant Service (UGS)
Real-Time Polling Service (rtPS)
Non-Real-Time Polling Service (nrtPS)
Best Effort (BE)
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Introduction
This article addresses two resourcemanagement mechanisms in WiMAX accessnetworks
Adaptive power allocation (APA)
Call admission control (CAC)
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Wimax Downlink APAOptimization
The WiMAX uplink and downlinktransmission can be optimized by APA,which allows the transmitter to grantdifferent power levels to different
subcarriers according to the channel stateinformation from the physical layer
The service providers usually expect a
power allocation scheme that producesoptimal revenue.
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Wimax Downlink APAOptimization
To investigate the APA revenue of a certainscheme, we define the revenue rate of eachtype of service as the revenue generated bya bandwidth unit. We let rerUGS, rerrtPS,
rernrtPS, and rerBE be the revenue rates ofthe following
Unsolicited Grant Service
Real-Time Polling Service
Non-Real-Time Polling Service
Best-Effort Service
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Wimax Downlink APAOptimization
arriving downlink traffic load in subscriber k's local network
traffic load can generate potential revenue in subscriber k'slocal network
revenue-to-bandwidth ratio of the kth subscriber
The optimal revenue-criterion-based APA allocate morepower resource to the subcarriers that belong to thesubscriber of high revenue-to-bandwidth ratio.
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Wimax Downlink APAOptimization
This consideration leads to fairness-constrainedoptimal revenue criterion
Simulation
OFDMA
32 subscribers
BS-SS distances 2 to 10 km
Power level MQAM
M-ary quadrature amplitude modulation
is 80%
In our simulation, the channel is assumed to have a bad-urban (BU)delay profile [Principles of Mobile Communication]
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Wimax Downlink APAOptimization
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Deploying CAC In Wimax AccessNetworks
To handle a multiservice WiMAX accessnetwork, it is very important to employ theCAC mechanism.
CAC is a crucial step for the provision of QoSguaranteed service, because it can preventthe system capacity from being overused.
We suppose a CAC manager is placed in aWiMAX base station.
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Deploying CAC In Wimax AccessNetworks
1. When an application in subscriber k's localnetwork initiates a connection to the Internet, itsends connection request to the CAC managerwith upstream bandwidth requirement bU anddownstream bandwidth requirement bD.
2. the CAC manager employs uplink CAC policyand downlink CAC policy to make admissiontests on the uplink and downlink separately,and only the connection request passing both
admission tests can be accepted eventually
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Deploying CAC In Wimax AccessNetworks
Click to edit Master text stylesSecond level
Third level Fourth level Fifth level
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Deploying CAC In Wimax AccessNetworks
From the perspective of service provider, theadmission control policy that producesoptimal revenue is desired.
From the perspective of WiMAX subscribers,the admission control policy of optimal utilityis expected, since it can produce the
maximum access bandwidth.
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The Cooperation Between APAand CAC
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Conclusion
Since the current standardization activitiesof IEEE 802.16 leave service providers achance to have their own selections in thesetwo technical aspects, distinct designing
criteria that follows can be chosen.
From the perspective of service providers,
optimal revenue is the major concern ofboth APA and CAC design
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Conclusion
From the perspective of subscribers, fairnessis the requirement of APA design, whileoptimal utility is the requirement of CACdesign.
To successfully deploy a commercial WiMAXsystem, we have to take into account the
demands of both service providers andsubscribers.
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